阅读说明：本技术 湖盆的物源及砂体运移方向的识别方法及装置 (Method and device for identifying source of lake basin and sand body movement direction ) 是由 郭芪恒 史书婷 昝灵 金振奎 王金艺 任亦霖 王凌 于 2020-12-07 设计创作，主要内容包括：本发明公开了一种湖盆的物源及砂体运移方向的识别方法及装置。该识别方法包括：建立研究区目的层段的小层或单层对比格架；利用自然伽马曲线将研究区目的层段的砂岩分为好砂岩和差砂岩；利用好砂岩的厚度数据,绘制研究区目的层段的好砂岩等值线图及砂地比等值线图；利用好砂岩厚度等值线图及砂地比等值线图,分析湖盆的物源及砂体的运移方向。本发明排除了以前不区分砂体使得砂体纵向叠合造成全盆含砂,物源连片的假象,使得对物源及砂体运移方向的识别更加直观、精确,反映的信息也更多。(The invention discloses a method and a device for identifying a source of a lake basin and a sand body moving direction. The identification method comprises the following steps: establishing a small layer or a single layer contrast framework of a target layer section of a research area; the sandstone of the target interval of the research area is divided into good sandstone and poor sandstone by utilizing a natural gamma curve; drawing a good sandstone contour map and a sand-to-ground ratio contour map of a target interval of a research area by using the thickness data of the good sandstone; and analyzing the source of the lake basin and the migration direction of the sand body by utilizing the sandstone thickness contour map and the sand-ground ratio contour map. The invention eliminates the false impression that the prior sand body is not distinguished, so that the sand body is longitudinally overlapped to form a whole basin containing sand and a material source connecting sheet, so that the identification of the material source and the sand body moving direction is more visual and accurate, and the reflected information is more.)

1. A method for identifying the source of a lake basin and the moving direction of sand bodies is characterized by comprising the following steps:

establishing a small layer or a single layer contrast framework of a target layer section of a research area;

the sandstone of the target interval of the research area is divided into good sandstone and poor sandstone by utilizing a natural gamma curve;

drawing a good sandstone contour map and a sand-to-ground ratio contour map of the target interval of the research area by using the thickness data of the good sandstone;

and analyzing the source of the lake basin and the migration direction of the sand body by utilizing the good sandstone thickness contour map and the sand-ground ratio contour map.

2. The identification method according to claim 1, further comprising:

and collecting all logging information of the target interval of the research area.

3. The identification method according to claim 1, wherein the using a natural gamma curve to separate the sandstone of the interval of interest of the research area into good sandstone and poor sandstone comprises:

judging whether the natural gamma curve value of the sandstone is smaller than a preset value or not by combining the comparison of rock core data;

if the natural gamma curve value of the sandstone is smaller than a preset value, judging the sandstone is good;

and if the natural gamma curve value of the sandstone is greater than or equal to a preset value, judging the sandstone is poor.

4. The method for identifying according to claim 1, wherein the drawing a good sandstone contour map and a sand-to-ground ratio contour map of the target interval of the research area by using the thickness data of the good sandstone comprises:

calculating the vertical thickness of the good sandstone by using the natural gamma curve;

and drawing a contour map of the thickness of the good sandstone and a contour map of the sand-to-ground ratio according to the vertical thickness of the good sandstone.

5. A device for identifying the source of a lake basin and the moving direction of sand bodies is characterized by comprising:

an establishment module configured to establish a small or single layer contrast lattice for a target interval of a study area;

a classification module configured to classify sandstone of a target interval of the study area into good sandstone and bad sandstone using a natural gamma curve;

a drawing module configured to make a good sandstone contour map and a sand-to-ground ratio contour map of the study area target interval by using the thickness data of the good sandstone;

an analysis module configured to analyze a source of the lake basin and a migration direction of the sand body using the good sand thickness contour map and the sand ground ratio contour map.

6. The identification device of claim 5, further comprising:

a collection module configured to collect all logging information for the interval of interest of the study area.

7. The identification device of claim 1, wherein the classification module is further configured to:

judging whether the natural gamma curve value of the sandstone is smaller than a preset value or not by combining the comparison of rock core data;

if the natural gamma curve value of the sandstone is smaller than a preset value, judging the sandstone is good;

and if the natural gamma curve value of the sandstone is greater than or equal to a preset value, judging the sandstone is poor.

8. The identification device of claim 1, wherein the mapping module is further configured to:

calculating the vertical thickness of the good sandstone by using the natural gamma curve;

and drawing a contour map of the thickness of the good sandstone and a contour map of the sand-to-ground ratio according to the vertical thickness of the good sandstone.

9. A machine-readable storage medium, characterized in that instructions are stored thereon for causing a machine to perform the method of identification of the origin of a lake basin and the direction of sand movement according to any one of claims 1 to 8.

10. A processor characterized by being configured to run a program, wherein the program is configured to execute the method for identifying the source of the lake basin and the direction of the migration of the sand according to any one of claims 1 to 8.

Technical Field

The invention relates to the field of oil exploration, in particular to a method and a device for identifying a source of a lake basin and a sand body migration direction.

Background

In recent years, students commonly use data such as earthquake, well logging, geochemical test of related rock samples and the like to determine the source direction by combining core sedimentary facies analysis, a sandstone thickness map and a sand-land ratio map of a target interval. Although these methods are able to identify the major sources of the basin, they all suffer from certain drawbacks and limitations. The seismic section is combined with well logging sedimentary facies analysis to determine that the quality requirement of an object source on seismic data is high, the longitudinal resolution of the seismic data is low, and the application effect on a target layer with a thin thickness, especially a mutual sedimentary stratum between sand and mud, is extremely poor; the geochemical test of the rock core needs more core-taking well data and has higher test cost. Sandstone thickness map and sand ground are than the map can reflect main thing source direction, but prior art is relatively poor to continental facies lake basin, especially the broken trap lake basin of full basin sand-laden, and the migration direction of thing source and sand body can't be discerned to accurate fixed point.

Disclosure of Invention

The embodiment of the invention aims to provide a method and a device for identifying the migration direction of a source and sand bodies of a lake basin, which are used for solving the problems that the prior art has poor identification effect on continental lake basins containing sand and cannot accurately identify the migration direction of the source and the sand bodies at fixed points.

In order to achieve the above object, a first aspect of the present invention provides a method for identifying a source of a lake basin and a direction of travel of sand, comprising:

establishing a small layer or a single layer contrast framework of a target layer section of a research area;

the sandstone of the target interval of the research area is divided into good sandstone and poor sandstone by utilizing a natural gamma curve;

drawing a good sandstone contour map and a sand-to-ground ratio contour map of a target interval of a research area by using the thickness data of the good sandstone;

and analyzing the source of the lake basin and the migration direction of the sand body by utilizing the sandstone thickness contour map and the sand-ground ratio contour map.

In an embodiment of the present invention, the method further includes:

all logging information for the interval of interest of the study area is collected.

In the embodiment of the invention, the sandstone of the target interval of the research area is divided into good sandstone and poor sandstone by using a natural gamma curve, and the method comprises the following steps:

judging whether the natural gamma curve value of the sandstone is smaller than a preset value or not by combining the comparison of rock core data;

if the natural gamma curve value of the sandstone is smaller than a preset value, judging the sandstone is good;

and if the natural gamma curve value of the sandstone is greater than or equal to the preset value, judging the sandstone is poor.

In the embodiment of the invention, the method for drawing the good sandstone contour map and the sand-to-ground ratio contour map of the target interval of the research area by using the thickness data of the good sandstone comprises the following steps:

calculating the vertical thickness of the sandstone by using a natural gamma curve;

and drawing a contour map of the thickness of the good sandstone and a contour map of the sand-to-ground ratio according to the vertical thickness of the good sandstone.

A second aspect of the present invention provides a device for identifying a source of a lake basin and a direction of travel of sand, comprising:

an establishment module configured to establish a small or single layer contrast lattice for a target interval of a study area;

the classification module is configured to utilize a natural gamma curve to classify sandstone of a target interval of a research area into good sandstone and poor sandstone;

the drawing module is configured to use the thickness data of the good sandstone to make a good sandstone contour map and a sand-to-ground ratio contour map of a target interval of the research area;

and the analysis module is configured to analyze the source of the lake basin and the migration direction of the sand body by utilizing the good sandstone thickness contour map and the sand ground ratio contour map.

In an embodiment of the present invention, the method further includes:

a collection module configured to collect all logging information for a target interval of a study area.

In an embodiment of the invention, the classification module is further configured to:

judging whether the natural gamma curve value of the sandstone is smaller than a preset value or not by combining the comparison of rock core data;

if the natural gamma curve value of the sandstone is smaller than a preset value, judging the sandstone is good;

and if the natural gamma curve value of the sandstone is greater than or equal to the preset value, judging the sandstone is poor.

In an embodiment of the invention, the rendering module is further configured to:

calculating the vertical thickness of the sandstone by using a natural gamma curve;

and drawing a contour map of the thickness of the good sandstone and a contour map of the sand-to-ground ratio according to the vertical thickness of the good sandstone.

A third aspect of the present invention provides a machine-readable storage medium having stored thereon instructions for causing a machine to execute the method for identifying a source of a lake basin and a direction of sand migration according to the above.

A fourth aspect of the present invention provides a processor for executing a program, wherein the program is executed for executing the method for identifying the source of the lake basin and the direction of the sand movement.

According to the technical scheme, on the basis of fine stratum division, the natural gamma curve value is used for dividing the sandstone and the poor sandstone, the thickness data of the sandstone is reused, and the sandstone contour map and the sand-ground ratio contour map are drawn, so that the migration direction of the source and the sand body of the lake basin is analyzed. The false phenomena that the sand bodies are longitudinally overlapped to form a whole basin containing sand and a material source connecting sheet because the sand bodies are not distinguished in the prior art are eliminated, so that the identification of the material source and the moving direction of the sand bodies is more visual and accurate, and more reflected information is obtained.

Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:

fig. 1 is a schematic flow chart of a method for identifying a source of a lake basin and a sand body migration direction according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a stratigraphic contrast lattice of three sand groups on the Fufang section provided by an embodiment of the invention;

fig. 3 is a schematic structural diagram of the interpretation result of the H2 well three-sand group good sandstone and poor sandstone according to an embodiment of the invention;

FIG. 4 is a schematic structural diagram of a good sandstone thickness contour map of three-sand group on the Fufang section provided by an embodiment of the invention;

FIG. 5 is a schematic flow chart of a method for identifying the source of the lake basin and the direction of the sand movement according to another embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an apparatus for identifying the source of a lake basin and the direction of sand movement according to an embodiment of the present invention;

fig. 7 is a schematic structural view of an apparatus for identifying a source of a lake basin and a direction of sand movement according to another embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic flow chart of a method for identifying a source of a lake basin and a sand body migration direction according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides a method for identifying a source of a lake basin and a direction of sand migration, including the following steps.

In step S11, a small or single layer contrast lattice of the interval of interest of the study area is established. In the embodiment of the invention, the accurate analysis of the main source direction of the lake basin is beneficial to determining favorable reservoir distribution, optimizing well position deployment, reducing exploration risk and improving the drilling rate of an oil layer. Therefore, accurate and fine comparison of the stratum is the basis, and if the longitudinal division is too coarse, the purpose of accurate identification cannot be achieved. For relatively shallow land-based lake basins affected by frequent fluctuations in the lake level, frequent lake-backing and lake-advancing can cause the planar sedimentary phases to move particularly greatly. If the stratum division is not high in precision, a stratum unit often contains a plurality of or even dozens of sets of sand bodies, and the good sandstone contour map and the good sandstone area ratio contour map are the result of overlapping the sets of good sand bodies. If the inheritance development of the source of the lake basin is excellent, the thickness response in the source direction and the sand body extending direction can be enhanced by overlapping a plurality of sets of sandstone, so that the accurate judgment of the source direction and the sand body direction is more intuitive. If the direction of the source is changed on the plane along with the lifting of the lake plane, the superposition can further homogenize the contour line of the thickness of the good sandstone on the plane, thereby being not beneficial to accurately identifying the direction of the source and the evolution thereof at fixed points and analyzing the extension direction of the main sand body. Therefore, on the longitudinal scale, the stratum is divided as finely as possible by combining with stable mud rock stratum in the full research area of the lake-flooding period. For example, according to the collected logging curves, the circling characteristics of the logging curves and stable lake-flooding mudstones in the whole research area, the target layer interval is finely divided into small layers or single layers, and a fine stratum contrast grid in the whole area is established. As shown in fig. 2, fig. 2 is a schematic structural diagram of a stratigraphic contrast lattice of three sand groups on the mons three sections according to an embodiment of the present invention. The Qinton recessed Fun three-segment three-sand group belongs to a typical continental gentle slope lake basin containing sand and mud, and is mainly a gentle slope delta deposition environment. The land-based gentle slope lake basin has the greatest characteristic that the lake-flooding mudstone is stably distributed in the whole area and is an important isochronous interface. As can be seen from fig. 2, the Natural Gamma (GR) value corresponding to the sandstone in each stratigraphic unit has obvious variation, the cumulative thickness in the range of the sand group is large, and if the sandstone is not distinguished, the source of the object cannot be accurately identified by using the sandstone thickness and the sand-to-ground ratio contour map. Therefore, further differentiation of the sandstone of the interval of interest is required.

In step S12, the sandstone in the interval of interest in the study area is divided into good sandstone and bad sandstone by using a natural gamma curve. In an embodiment of the present invention, the natural gamma curve, i.e., the GR curve, is extremely sensitive to the reflection of the sandstone type, and in particular to the shale content in the sandstone. The shale content in the sandstone determines the amplitude of the GR curve. Actual data show that the GR curve of sandstone with more argillaceous content shows relatively high value. In continental lake basins, especially in the continental lake basins under the deposition background of delta, the river diversion channel-estuary dam-mat sand evolves, the sand body shale content corresponding to each deposition micro-phase gradually increases, and the amplitude of a well logging GR curve also gradually decreases (in individual well positions lacking the GR curve, the amplitude of an SP curve is closely related to the deposition micro-phase). In the embodiment of the invention, the defined good sandstone is mainly sandstone represented by a diversion channel and an estuary dam, wherein the GR value is relatively low and the diversion channel and the estuary dam are represented by a direction capable of representing a source and an extension direction of the sandstone. If the development of the land-based lake basin diversion riverway is very common, for actual requirements, the boundary between good sandstone and poor sandstone of a GR curve can be further reduced, so that the object source and the sand body extension direction can be more intuitively and accurately depicted. In the embodiment of the invention, the GR curve amplitude is mainly used for depicting good sandstone and poor sandstone, beach dam sand washed by lake waves is generally low in argillaceous content, and the well logging GR curve is low in value, namely belongs to the category of good sandstone, but the spreading form of good sand bodies is greatly different from a diversion river channel and a estuary dam which are input by a representative source, so that the accurate fixed-point identification of the source is not influenced. In general, the lower the GR value corresponding to good sandstone and poor sandstone, the more precise the source direction and the sand dominance extension direction represented by the well-defined sandstone.

In the embodiment of the invention, the sandstone of the target interval of the research area is divided into good sandstone and poor sandstone by using a natural gamma curve, and the method comprises the following steps:

judging whether the natural gamma curve value of the sandstone is smaller than a preset value or not by combining the comparison of rock core data;

if the natural gamma curve value of the sandstone is smaller than a preset value, judging the sandstone is good;

and if the natural gamma curve value of the sandstone is greater than or equal to the preset value, judging the sandstone is poor.

Specifically, for the continental lake basin, the content of the mud in the diversion river sand and estuary dam sand representing the source direction and the sand body extension direction is generally low, and the sandstone is relatively pure, namely the sandstone belongs to good sandstone and can reflect the source direction and the sand body extension; the mud content of the relatively deep-water mat-shaped sand and gravity quicksand is generally high, namely the sand belongs to poor sandstone and cannot reflect the source direction; the beach bar sand body washed back and forth by the waves is also pure and belongs to the category of good sandstone, but the beach bar sand body cannot be used for indicating the direction of a source, is the result of secondary transportation of sand input into a lake by the source, and has obvious difference from the good sandstone representing the direction of the source in distribution form, so that the influence on the result is little. The embodiment of the invention combines the core data comparison, compares the GR value of the sandstone with the preset value, can judge as good sandstone if the GR value of the sandstone is less than the preset value, and can judge as bad sandstone if the GR value of the sandstone is greater than or equal to the preset value. For example, by observing the core of the three-sand group of the fun three-section, as shown in fig. 3, fig. 3 is a schematic structural diagram of the interpretation result of the good sandstone and the poor sandstone of the three-sand group of the H2 well according to an embodiment of the present invention. Taking an H2 well as an example, a well with a GR value less than 55API is defined as good sandstone, a well with a GR value higher than 55API but greater than the mudstone baseline GR value is defined as bad sandstone, and a well in the full study area is interpreted as good sandstone and bad sandstone. It is noted that the limits of good and bad sand change in the whole study area before the well log normalization process is not performed or in the case of poor normalization results, and need to be adjusted according to actual conditions.

In step S13, a good sandstone contour map and a sand-to-ground ratio contour map of the interval of interest of the study area are drawn using the thickness data of the good sandstone. In the embodiment of the invention, a good sandstone contour map and a sand-to-ground ratio contour map of a target interval of a research area can be drawn according to the divided good sandstone thickness data.

In the embodiment of the invention, the method for drawing the good sandstone contour map and the sand-to-ground ratio contour map of the target interval of the research area by using the thickness data of the good sandstone comprises the following steps:

calculating the vertical thickness of the sandstone by using a natural gamma curve;

and drawing a contour map of the thickness of the good sandstone and a contour map of the sand-to-ground ratio according to the vertical thickness of the good sandstone.

Specifically, the good sandstone vertical thicknesses of all wells in the target interval of the research area are obtained through calculation of a well logging GR curve. And (4) according to the vertical thickness of the good sandstone, making a good sandstone contour map and a sand-to-ground ratio contour map of the whole area. If the stratigraphic division reaches the range of a single layer or each small layer contains at most two sets of sand bodies, a sandstone sand ground ratio contour map is not needed, and the object source and the sandstone distribution can be accurately judged at fixed points by utilizing the sandstone thickness contour map.

In step S14, the migration direction of the source and the sand body of the lake basin is analyzed using the good sand thickness contour map and the sand ground ratio contour map. In the embodiment of the invention, the contour map of the thickness and the sand ground ratio of each small layer or single layer of good sandstone is analyzed, and the source direction and the sandstone extending direction of each small layer or single layer can be accurately seen in a fixed point. Aiming at the continental lake basin under the typical delta sedimentation background, the source is mainly controlled by a diversion river channel, the high value of the thickness of the good sandstone can be obviously seen to be promoted to the center of the lake basin in a strip shape through the good sandstone thickness and sand area ratio contour map, and the low value area of the good sandstone is generally distributed around the strip-shaped sand body. By comprehensively analyzing the contour map of each small layer or single layer of good sandstone, the characteristics of the swing of the object source direction and the intermittent supply of part of the object source region on a plane along with the time can be visually displayed, thereby providing a basis for qualitatively judging the relative altitude of the paleoconvex. For example, a three-segment full zone plot or a single-layer good sandstone contour map and a sand-to-ground ratio contour map. The three sections of the Fuzhou are typical broken-down continental lake basins with a four-circumference ring convex and a concave middle, wherein the landform in the northwest part is relatively slow, and the landform in the southeast part is relatively steep. As shown in fig. 4, fig. 4 is a schematic structural diagram of a contour map of the thickness of the good sandstone of the three-sand group of the monument provided by an embodiment of the present invention. As shown in fig. 4, fig. 4 presents a typical good sand thickness contour plot for three sand groups 7, 3, 2 single layers, as can be seen from fig. 3, these three belong to typical single layers, and therefore do not need to be made good sand to contour plots. As can be seen from fig. 4, the direction of each single-layer source and the direction of the sand dominant migration can be visually and precisely identified, and the evolution of each single-layer source on the plane is also shown as time goes on. The arrows in fig. 4 indicate the source direction and the direction of the dominant sand transport. Generally, the inheritance of the southeast raised object source is better, and the plane swing of the object source in different periods in the northwest is larger. And (3) displaying a contour map of the good sandstone, wherein the source is integrally pushed to a deposition center in a strip shape or a fan shape, and the deposition background of the gentle slope delta is met. Frequent changes along with the lake plane and the swinging of the source direction caused by the change are the main reasons for the full basin sand content of the research area. The fine stratum comparison and the distinction between good sandstone and poor sandstone according to the well logging GR are the simplest and most accurate methods for accurately positioning and identifying the sedimentary background continental lake basin, and the result is more visual along with the reduction of the GR values of the good sandstone and the poor sandstone, and can be further determined according to the conditions of a research area in practical application.

According to the technical scheme, on the basis of fine stratum division, the natural gamma curve value is used for dividing the sandstone and the poor sandstone, the thickness data of the sandstone is reused, and the sandstone contour map and the sand-ground ratio contour map are drawn, so that the migration direction of the source and the sand body of the lake basin is analyzed. The false phenomena that the sand bodies are longitudinally overlapped to form a whole basin containing sand and a material source connecting sheet because the sand bodies are not distinguished in the prior art are eliminated, so that the identification of the material source and the moving direction of the sand bodies is more visual and accurate, and more reflected information is obtained.

Referring to fig. 5, fig. 5 is a schematic flow chart of a method for identifying a source of a lake basin and a sand body migration direction according to another embodiment of the present invention. As shown in fig. 5, the identifying party may further include:

and step S15, collecting all logging information of the target interval of the research area.

In embodiments of the present invention, all well log information for a target interval of a study area may be collected first, at the establishment of a small or single layer contrast grid money for the target interval of the study area. Preferably, there is a GR curve for each well, and SP curves can be substituted for individual wells lacking GR curves. The oil and gas fields are mostly in the middle and later development stages, the well spacing is small, the well pattern is dense, and therefore available well information is also large. According to the logging curve, the denser the well pattern is, the more accurate and reliable the result is.

According to the embodiment of the invention, on the basis of establishing the fine stratum framework, the good sandstone and the poor sandstone are distinguished according to the GR value of the logging curve of the research area, and the source direction and the sandstone extension direction are further accurately determined at fixed points. The method is simple, strong in operability, extremely low in cost and intuitive in result, and particularly has important significance for further optimizing well location deployment, improving the drilling rate of an oil layer and reducing exploration cost by accurately identifying the material source and the extension direction of sandstone through the dissection of a dense well pattern area aiming at oil fields developed in the middle and later periods of a continental lake basin. The fine stratum framework is built, the homogenization phenomenon of a sand contour map caused by the longitudinal superposition of multiple sets of sand bodies is avoided, the small-layer/single-layer good sandstone thickness contour map can accurately identify the object source direction and the sandstone extension direction at fixed points, the plane swing and intermittence of the object source direction along with the time and the lake plane height change can be clear, and the method has important guiding significance for further analyzing the ancient landform of the basin, the dominant sand body control factor and the spreading rule.

Referring to fig. 6, fig. 6 is a schematic structural view of an apparatus for identifying a source of a lake basin and a sand body migration direction according to an embodiment of the present invention. As shown in fig. 6, the present invention provides a device for identifying a source of a lake basin and a direction of travel of sand, comprising:

an establishing module 61 configured to establish a small or single-layer contrast lattice of the target interval of the study area;

a classification module 62 configured to classify sandstone of a target interval of the study area into good sandstone and bad sandstone using a natural gamma curve;

the drawing module 63 is configured to make a good sandstone contour map and a sand-to-ground ratio contour map of a target interval of the research area by using the thickness data of the good sandstone;

an analysis module 64 configured to analyze the source of the lake basin and the migration direction of the sand bodies using the good sand thickness contour map and the sand ground ratio contour map.

In an embodiment of the invention, the building module 61 builds a small or single layer contrast lattice of the target interval of the study area. In the embodiment of the invention, the accurate analysis of the main source direction of the lake basin is beneficial to determining favorable reservoir distribution, optimizing well position, reducing exploration risk and improving the drilling rate of an oil layer. Therefore, accurate and fine comparison of the stratum is the basis, and if the longitudinal division is too coarse, the purpose of accurate identification cannot be achieved. In the case of relatively shallow land-based lake basins, which are affected by frequent fluctuations in the lake level, the sequential lake-backing and lake-advancing causes the planar sedimentary phases to move particularly greatly. If the stratum division is not high in precision, a stratum unit often contains a plurality of or even dozens of sets of sand bodies, and the good sandstone contour map and the good sandstone area ratio contour map are the result of overlapping the sets of good sand bodies. If the inheritance development of the source of the lake basin is excellent, the thickness response in the source direction and the sand body extending direction can be enhanced by overlapping a plurality of sets of sandstone, so that the accurate judgment of the source direction and the sand body direction is more intuitive. If the direction of the source is changed on the plane along with the lifting of the lake plane, the superposition can further homogenize the contour line of the thickness of the good sandstone on the plane, thereby being not beneficial to accurately identifying the direction of the source and the evolution thereof at fixed points and analyzing the extension direction of the main sand body. Therefore, on the longitudinal scale, the stratum is divided as finely as possible by combining with stable mud rock stratum in the full research area of the lake-flooding period. For example, according to the collected logging curves, the circling characteristics of the logging curves and stable lake-flooding mudstones in the whole research area, the target layer interval is finely divided into small layers or single layers, and a fine layer comparison grid in the whole area is established. As shown in fig. 2, fig. 2 is a schematic structural diagram of a stratigraphic contrast lattice of three sand groups on the mons three sections according to an embodiment of the present invention. The Qinton recessed Fun three-segment three-sand group belongs to a typical continental gentle slope lake basin containing sand and mud, and is mainly a gentle slope delta deposition environment. The land-based gentle slope lake basin has the greatest characteristic that the lake-flooding mudstone is stably distributed in the whole area and is an important isochronous interface. As can be seen from fig. 2, the Natural Gamma (GR) value corresponding to the sandstone in each stratigraphic unit has obvious variation, the cumulative thickness in the range of the sand group is large, and if the sandstone is not distinguished, the source of the object cannot be accurately identified by using the sandstone thickness and the sand-to-ground ratio contour map. Therefore, further differentiation of the sandstone of the interval of interest is required.

In an embodiment of the present invention, the classification module 62 uses a natural gamma curve to classify the sandstone of the interval of interest of the study into good sandstone and bad sandstone. In an embodiment of the present invention, the natural gamma curve, i.e., the GR curve, is extremely sensitive to the reflection of the sandstone type, and in particular to the shale content in the sandstone. The shale content in the sandstone determines the amplitude of the GR curve. Actual data show that the GR curve of sandstone with more argillaceous content shows relatively high value. In continental lake basins, especially in the continental lake basins under the deposition background of delta, the river diversion channel-estuary dam-mat sand evolves, the sand body shale content corresponding to each deposition micro-phase gradually increases, and the amplitude of a well logging GR curve also gradually decreases (in individual well positions lacking the GR curve, the amplitude of an SP curve is closely related to the deposition micro-phase). In the embodiment of the invention, the defined good sandstone is mainly sandstone represented by a diversion channel and an estuary dam, wherein the GR value is relatively low and the diversion channel and the estuary dam are represented by a direction capable of representing a source and an extension direction of the sandstone. If the development of the land-based lake basin diversion riverway is very common, for actual requirements, the boundary between good sandstone and poor sandstone of a GR curve can be further reduced, so that the object source and the sand body extension direction can be more intuitively and accurately depicted. In the embodiment of the invention, the GR curve amplitude is mainly used for depicting good sandstone and poor sandstone, beach dam sand washed by lake waves is generally low in argillaceous content, and the well logging GR curve is low in value, namely belongs to the category of good sandstone, but the spreading form of good sand bodies is greatly different from a diversion river channel and a estuary dam which are input by a representative source, so that the accurate fixed-point identification of the source is not influenced. In general, the lower the GR value corresponding to good sandstone and poor sandstone, the more precise the source direction and the sand dominance extension direction represented by the well-defined sandstone.

In an embodiment of the present invention, the classification module 62 is further configured to:

judging whether the natural gamma curve value of the sandstone is smaller than a preset value or not by combining the comparison of rock core data;

if the natural gamma curve value of the sandstone is smaller than a preset value, judging the sandstone is good;

and if the natural gamma curve value of the sandstone is greater than or equal to the preset value, judging the sandstone is poor.

Specifically, for the continental lake basin, the content of the mud in the diversion river sand and estuary dam sand representing the source direction and the sand body extension direction is generally low, and the sandstone is relatively pure, namely the sandstone belongs to good sandstone and can reflect the source direction and the sand body extension; the mud content of the relatively deep-water mat-shaped sand and gravity quicksand is generally high, namely the sand belongs to poor sandstone and cannot reflect the source direction; the beach bar sand body washed back and forth by the waves is also pure and belongs to the category of good sandstone, but the beach bar sand body cannot be used for indicating the direction of a source, is the result of secondary transportation of sand input into a lake by the source, and has obvious difference from the good sandstone representing the direction of the source in distribution form, so that the influence on the result is little. The embodiment of the invention combines the core data comparison, compares the GR value of the sandstone with the preset value, can judge as good sandstone if the GR value of the sandstone is less than the preset value, and can judge as bad sandstone if the GR value of the sandstone is greater than or equal to the preset value. For example, by observing the core of the three-sand group of the fun three-section, as shown in fig. 3, fig. 3 is a schematic structural diagram of the interpretation result of the good sandstone and the poor sandstone of the three-sand group of the H2 well according to an embodiment of the present invention. Taking an H2 well as an example, a well with a GR value less than 55API is defined as good sandstone, a well with a GR value higher than 55API but greater than the mudstone baseline GR value is defined as bad sandstone, and a well in the full study area is interpreted as good sandstone and bad sandstone. It is noted that the limits of good and bad sand change in the whole study area before the well log normalization process is not performed or in the case of poor normalization results, and need to be adjusted according to actual conditions.

In the embodiment of the present invention, the drawing module 63 draws a good sandstone contour map and a sand-to-ground ratio contour map of a target interval of the study area by using the thickness data of the good sandstone. In the embodiment of the invention, a good sandstone contour map and a sand-to-ground ratio contour map of a target interval of a research area can be drawn according to the divided good sandstone thickness data.

In an embodiment of the present invention, the rendering module 63 is further configured to:

calculating the vertical thickness of the sandstone by using a natural gamma curve;

and drawing a contour map of the thickness of the good sandstone and a contour map of the sand-to-ground ratio according to the vertical thickness of the good sandstone.

Specifically, the good sandstone vertical thicknesses of all wells in the target interval of the research area are obtained through calculation of a well logging GR curve. And (4) according to the vertical thickness of the good sandstone, making a good sandstone contour map and a sand-to-ground ratio contour map of the whole area. If the stratigraphic division reaches the range of a single layer or each small layer contains at most two sets of sand bodies, the sandstone thickness and sand-to-ground ratio contour map is not needed to be made, and the object source and the sandstone distribution can be accurately judged at fixed points by utilizing the sandstone contour map.

In an embodiment of the present invention, the analysis module 64 analyzes the source of the lake basin and the migration direction of the sand body using the good sand thickness contour map and the sand ground ratio contour map. In the embodiment of the invention, the contour map of the thickness and the sand ground ratio of each small layer or single layer of good sandstone is analyzed, and the source direction and the sandstone extending direction of each small layer or single layer can be accurately seen in a fixed point. Aiming at the continental lake basin under the typical delta sedimentation background, the source is mainly controlled by a diversion river channel, the high value of the thickness of the good sandstone can be obviously seen to be promoted to the center of the lake basin in a strip shape through the good sandstone thickness and sand area ratio contour map, and the low value area of the good sandstone is generally distributed around the strip-shaped sand body. By comprehensively analyzing the contour map of each small layer or single layer of good sandstone, the characteristics of the swing of the object source direction and the intermittent source supply among part of object source regions on a plane can be visually displayed along with the time, so that a basis is provided for qualitatively judging the relative height of the paleoconvex altitude. For example, a three-segment full zone plot or a single-layer good sandstone contour map and a sand-to-ground ratio contour map. The three sections of the Fuzhou are typical broken-down continental lake basins with a four-circumference ring convex and a concave middle, wherein the landform in the northwest part is relatively slow, and the landform in the southeast part is relatively steep. As shown in fig. 4, fig. 4 is a schematic structural diagram of a contour map of the thickness of the good sandstone of the three-sand group of the monument provided by an embodiment of the present invention. As shown in fig. 4, fig. 4 presents a typical good sand thickness contour plot for three sand groups 7, 3, 2 single layers, as can be seen from fig. 3, these three belong to typical single layers, and therefore do not need to be made good sand to contour plots. As can be seen from fig. 4, the direction of each single-layer source and the direction of the sand dominant migration can be visually and precisely identified, and the evolution of each single-layer source on the plane is also shown as time goes on. The arrows in fig. 4 indicate the source direction and the direction of the dominant sand transport. Generally, the inheritance of the southeast raised object source is better, and the plane swing of the object source in different periods in the northwest is larger. The contour map of the good sandstone shows that the source is integrally pushed to the deposition center in a strip shape or a fan shape, and the load is applied to the deposition background of the delta. Frequent changes in the lake plane and the swinging of the puppet's listening to its source are the main causes of the basin-full sand in the study area. The fine bottom layer comparison and the distinction between good sandstone and poor sandstone according to the well logging GR are the simplest and most accurate methods for accurately positioning and identifying the sedimentary background continental lake basin, and the result is more visual along with the reduction of the GR values of the good sandstone and the poor sandstone, and can be further determined according to the conditions of a research area in practical application.

According to the technical scheme, on the basis of fine stratum division, the natural gamma curve value is used for dividing the sandstone and the poor sandstone, the thickness data of the sandstone is reused, and the sandstone contour map and the sand-ground ratio contour map are drawn, so that the migration direction of the source and the sand body of the lake basin is analyzed. The false phenomena that the sand bodies are longitudinally overlapped to form a whole basin containing sand and a material source connecting sheet because the sand bodies are not distinguished in the prior art are eliminated, so that the identification of the material source and the moving direction of the sand bodies is more visual and accurate, and more reflected information is obtained.

Referring to fig. 7, fig. 7 is a schematic structural view of an apparatus for identifying a source of a lake basin and a sand body migration direction according to another embodiment of the present invention. As shown in fig. 7, the method further includes:

a collection module 65 configured to collect all logging information for the interval of interest of the study area.

In embodiments of the present invention, the collection module 65 may first collect all well log information for a target interval of a study area at a small or single layer contrast grid money for establishing the target interval of the study area. Preferably, there is a GR curve for each well, and SP curves can be substituted for individual wells lacking GR curves. The oil and gas fields are mostly in the middle and later development stages, the well spacing is small, the well pattern is relatively secret, and therefore available well information is relatively large. According to the logging curve, the denser the well pattern is, the more accurate and reliable the result is.

According to the embodiment of the invention, on the basis of establishing the fine stratum framework, the good sandstone and the poor sandstone are distinguished according to the GR value of the logging curve of the research area, and the source direction and the sandstone extension direction are further accurately determined at fixed points. The method is simple, strong in operability, extremely low in cost and intuitive in result, and particularly has important significance for further optimizing well location deployment, improving the drilling rate of an oil layer and reducing exploration cost by accurately identifying the material source and the extension direction of sandstone through the dissection of a dense well pattern area aiming at oil fields developed in the middle and later periods of a continental lake basin. The fine stratum framework is built, the homogenization phenomenon of a sand contour map caused by the longitudinal superposition of multiple sets of sand bodies is avoided, the small-layer/single-layer good sandstone thickness contour map can accurately identify the object source direction and the sandstone extension direction at fixed points, the plane swing and intermittence of the object source direction along with the time and the lake plane height change can be clear, and the method has important guiding significance for further analyzing the ancient landform of the basin, the dominant sand body control factor and the spreading rule.

In an embodiment of the present invention, there is also provided a machine-readable storage medium having stored thereon instructions for causing a machine to execute the method for identifying a source of a lake basin and a direction of sand transport according to the above.

In an embodiment of the present invention, there is further provided a processor for executing a program, wherein the program is executed for executing the method for identifying the source of the lake basin and the sand body migration direction according to the above.

For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above is merely an embodiment of the present application, and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.