Method and device for predicting oil-gas phase state of deep layer of basin

文档序号：434916 发布日期：2021-12-24 浏览：7次中文

阅读说明：本技术 一种预测盆地深层油气相态的方法及装置 (Method and device for predicting oil-gas phase state of deep layer of basin ) 是由闫磊朱光有杨敏陈志勇李婷婷王珊曹颖辉李洪辉徐兆辉杜德道赵一民于 2020-06-23 设计创作，主要内容包括：本发明提供了一种预测盆地深层油气相态的方法及装置,所述方法包括步骤1：分析盆地基底岩性结构的分布；步骤2：分析盆地基底的埋深及起伏形态；步骤3：根据所述盆地基底岩性结构及盆地基底的埋深划分深层地温梯度区带,并根据所述深层地温梯度区带确定地温梯度；步骤4：建立每一深层地温梯度区带的地层温度、地温梯度及深度的关系式,将深度及步骤3中确定的地温梯度代入对应深层地温梯度区带的关系式中获得地层温度,并根据所获得的地层温度预测盆地深层油气相态。本发明所提供的方法及装置通过深层地温梯度识别深层油气相态,解决了深部地温梯度分布及深层油气相态等地质问题,为深层油气相态判别提供了依据。(The invention provides a method and a device for predicting the oil-gas phase state of a deep layer of a basin, wherein the method comprises the following steps of 1: analyzing the distribution of the bedrock structure; step 2: analyzing the buried depth and the fluctuation form of the basin foundation; and step 3: dividing deep geothermal gradient zones according to the lithologic structure of the basin foundation and the buried depth of the basin foundation, and determining geothermal gradient according to the deep geothermal gradient zones; and 4, step 4: and (3) establishing a relational expression of the formation temperature, the geothermal gradient and the depth of each deep geothermal gradient zone, substituting the depth and the geothermal gradient determined in the step (3) into the relational expression of the corresponding deep geothermal gradient zone to obtain the formation temperature, and predicting the oil-gas phase state of the deep basin according to the obtained formation temperature. The method and the device provided by the invention identify the deep layer oil gas phase state through the deep layer geothermal gradient, solve the geological problems of deep layer geothermal gradient distribution, deep layer oil gas phase state and the like, and provide a basis for distinguishing the deep layer oil gas phase state.)

1. A method for predicting deep-basin hydrocarbon phase states, the method comprising:

step 1: analyzing the distribution of the bedrock structure;

step 2: analyzing the buried depth and the fluctuation form of the basin foundation;

and step 3: dividing deep geothermal gradient zones according to the lithologic structure of the basin foundation and the buried depth of the basin foundation, and determining geothermal gradient according to the deep geothermal gradient zones;

and 4, step 4: and (3) establishing a relational expression of the formation temperature, the geothermal gradient and the depth of each deep geothermal gradient zone, substituting the depth and the geothermal gradient determined in the step (3) into the relational expression of the corresponding deep geothermal gradient zone to obtain the formation temperature, and predicting the oil-gas phase state of the deep basin according to the obtained formation temperature.

2. The method of claim 1, wherein step 1: analyzing the distribution of basin basement lithologic structures includes:

and corresponding the lithology of the single well base and the year measuring information of the rocks to the aeromagnetic anomaly of the basin base, and restricting and analyzing the distribution of the lithology structure of the basin base.

3. The method of claim 2, wherein acquiring the aeromagnetic anomaly of the basin floor comprises:

analyzing and comparing the outcrop rock magnetic susceptibility and the well drilling rock core magnetic susceptibility, and if the basin sedimentary rock magnetic susceptibility is generally low, corresponding the aeromagnetic anomaly of the basin base to the magnetic anomaly of the basin zone;

if the basin sedimentary rock has obvious strongly magnetic scale sedimentary rock, the data on the original observation plane of the aeromagnetic anomaly measured by the basin is converted to a higher observation plane, so that the high-frequency anomaly generated by the geologic body with small scale and shallow buried depth is more quickly attenuated, and the low-frequency anomaly generated by the geologic body with large scale and deep buried depth is highlighted and corresponds to the aeromagnetic anomaly of the basin base.

4. A method according to claim 3, wherein the higher observation plane is raised more than 20km above the height of the original observation plane.

5. The method of claim 1, wherein step 2: analyzing the burial depth of the basin foundation, comprising:

and identifying the reflection between the overburden layer and the substrate on the substrate by utilizing a two-dimensional seismic survey line through well seismic calibration and seismic reflection characteristic analysis and tracking so as to obtain a top surface construction drawing of the whole basin substrate, and analyzing the burial depth and the undulation form of the basin substrate according to the top surface construction drawing of the whole basin substrate.

6. The method as claimed in claim 1, wherein in step 3, dividing deep geothermal gradient zones according to the lithologic structure of the basin foundation and the burial depth of the basin foundation comprises:

determining the weight of the buried depth of the basin foundation and the weight of the lithologic structure of the basin foundation in the deep geothermal gradient zone respectively, determining the influence coefficients of different lithologic structures of the basin foundation, and dividing the geothermal gradient zone into a plurality of deep geothermal gradient zones according to the geothermal gradient by combining with the existing exploration zone.

7. The method as claimed in claim 1 or 6, wherein in step 3, determining the geothermal gradient according to the deep geothermal gradient zone comprises:

for a zone of the basal well drilling, directly obtaining a geothermal gradient according to the temperature data and the burial depth data;

for a zone of deep drilling, fitting the burial depth to the structural depth of the top surface of the substrate according to the linear fitting relation between the temperature data and the burial depth data of each single well in the existing known region, and thus obtaining the earth temperature gradient;

and for zones which are not drilled and are drilled in a shallow layer, determining the geothermal gradient according to the correction of each deep geothermal gradient zone.

8. The method according to claim 1, wherein in step 4, the relationship is represented by the following formula 1);

t ═ Δ T · D + C formula 1);

in formula 1): t is the formation temperature, DEG C; delta t is the ground temperature gradient, DEG C/m; d is depth, m; c is a constant.

9. The method of claim 1 or 8, wherein predicting deep-basin hydrocarbon phase from the obtained formation temperature in step 4 comprises:

when the temperature is higher than 220 ℃, a natural gas distribution area is defined as the deep layer of the basin; when the temperature is between 200 ℃ and 220 ℃, the condensate gas is distributed in the condensate gas distribution area; when the temperature is less than 200 ℃, the oil gas phase distribution area is formed.

10. An apparatus for predicting deep-basin hydrocarbon phase, the apparatus comprising:

a first analysis unit: for analyzing the distribution of the bedrock formation;

a second analysis unit: the method is used for analyzing the buried depth and the fluctuation form of the basin foundation;

a geothermal gradient determination unit: the deep geothermal gradient zone is divided according to the lithologic structure of the basin foundation and the buried depth of the basin foundation, and the geothermal gradient is determined according to the deep geothermal gradient zone;

a basin deep layer oil gas phase state prediction unit: the system is used for establishing a relational expression of the formation temperature, the geothermal gradient and the depth of each deep geothermal gradient zone, substituting the geothermal gradient determined by the depth and geothermal gradient determining unit into the relational expression of the corresponding deep geothermal gradient zone to obtain the formation temperature, and predicting the oil-gas phase state of the deep layer of the basin according to the obtained formation temperature.

11. The apparatus according to claim 10, wherein the first analysis unit is specifically configured to: and corresponding the lithology of the single well base and the year measuring information of the rocks to the aeromagnetic anomaly of the basin base, and restricting and analyzing the distribution of the lithology structure of the basin base.

12. The apparatus of claim 11, wherein the first analysis unit is further configured to:

13. The apparatus of claim 12, wherein the higher observation plane is raised more than 20km above the height of the original observation plane.

14. The apparatus according to claim 10, wherein the second analysis unit is specifically configured to:

15. The apparatus according to claim 10, wherein the geothermal gradient determination unit is specifically configured to:

16. The apparatus of claim 10 or 15, wherein the geothermal gradient determination unit is further configured to:

for a zone of the basal well drilling, directly obtaining a geothermal gradient according to the temperature data and the burial depth data;

and for zones which are not drilled and are drilled in a shallow layer, determining the geothermal gradient according to the correction of each deep geothermal gradient zone.

17. The apparatus according to claim 10, wherein the relationship is represented by the following formula 1);

t ═ Δ T · D + C formula 1);

in formula 1): t is the formation temperature, DEG C; delta t is the ground temperature gradient, DEG C/m; d is depth, m; c is a constant.

18. The apparatus of claim 10 or 17, wherein the deep-basin hydrocarbon phase prediction unit is specifically configured to:

19. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program performs the steps of the method of predicting deep hydrocarbon phases in a basin according to any one of claims 1 to 9.

20. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of predicting deep hydrocarbon phases of a basin according to any one of claims 1 to 9.

Technical Field

The invention relates to a method and a device for predicting oil-gas phase state of deep layer of basin, belonging to the technical field of oil-gas exploration.

Background

The deep hydrocarbon reservoir is also called deep hydrocarbon reservoir, and from the current knowledge, no clear definition has been made for the deep hydrocarbon reservoir.

The oil and gas reservoirs exceeding the oil and gas stable temperature and the lower depth limit are called deep oil and gas reservoirs when the oil and gas reservoir is advanced, the oil and gas reservoir below 4000m is suggested to be a deep oil and gas reservoir in the article, the ancient earth temperature exceeds 150 ℃ (the oil and gas reservoir is advanced when the oil and gas reservoir is advanced, the current situation and the progress of deep oil and gas research J, the earth science progress 2002, 17 (4): 565-; ShiXin determines deep oil-gas reservoirs to be buried below 5000m in depth, and considers that oil reservoirs with depth more than 5000m in China are mainly concentrated in Tarim basins (see ShiXin, deep oil-gas reservoir exploration prospect analysis J, first phase of petroleum exploration 2005: 1-10). China Petroleum stocks corporation (CNPC) divides the depth of oil and gas resources into four levels, namely a shallow layer (<2000m), a medium shallow layer (2000 + 3500m), a deep layer (3500 + 4500m) and an ultra-deep layer (>4500m), and considers that the petroleum resources in Xinjiang, Chaida and Hexi corridors mainly comprise the deep layer and the ultra-deep layer with the buried depth of more than 3500 m.

The deep hydrocarbon reservoir has the following characteristics: 1) the temperature is high and the distribution is wide; 2) the buried depth is large and the range is wide; 3) the phase states are multiple, mainly oil-gas phases and gas phases, and are mostly distributed on the young terraces; 4) the reservoir rock types are many, mainly comprising sand (conglomerate) rock and sulfate rock.

The existence of deep oil gas in which phase is one of the most concerned problems of researchers, which relates to the oil gas migration mode and the determination of the oil and gas finding mode. The temperature is an important factor influencing the formation of petroleum and natural gas, crude oil is often cracked into gas at a deep layer due to high temperature, but oil-gas phase states are different in different regions at the same depth, so that a lot of troubles are caused. Therefore, it is a technical problem to be solved in the art to provide a novel method and a device for effectively predicting the oil-gas phase state of the deep layer of the basin.

Disclosure of Invention

To address the above-described shortcomings and drawbacks, it is an object of the present invention to provide a method of predicting deep-basin hydrocarbon phases.

Another object of the present invention is to provide an apparatus for predicting deep-bed hydrocarbon phase in a basin.

It is also an object of the invention to provide a computer apparatus.

It is still another object of the present invention to provide a computer-readable storage medium.

To achieve the above object, in one aspect, the present invention provides a method of predicting deep-basin hydrocarbon phases, wherein the method of predicting deep-basin hydrocarbon phases includes:

step 1: analyzing the distribution of the bedrock structure;

step 2: analyzing the buried depth and the fluctuation form of the basin foundation;

Multiple drilling wells in the basin drill and uncover the lithology of the basin foundation, but the problem of distribution of regional foundation lithology structures cannot be met, and qualitative research needs to be carried out on the distribution of the basin foundation lithology structures by combining other means; the aeromagnetic anomaly reflects the composition of the base aeromagnetic anomaly and the cover layer aeromagnetic anomaly and is an important means for researching the lithologic structure of the basin base. The regional magnetic anomaly field of the basin mainly reflects the difference of the magnetic and structural forms of the crystalline basement and the later sedimentary rock of the basin.

The rock year measurement information is another important factor for analyzing the basement lithologic structure, statistics is carried out on the results of year measurement analysis on rocks around and in the basin in recent years, the basement lithologic and year measurement information of a single well can be corresponding to the basement magnetic anomaly, and then the lithologic structure of the basin basement is obtained through constraint analysis, so that the distribution of the basement lithologic structure of the basin can be analyzed more accurately.

Thus, in the above-described method, preferably, step 1: analyzing the distribution of basin basement lithologic structures includes:

In the above-described method, preferably, acquiring the aeromagnetic anomaly of the basin foundation comprises:

In the above method, the height of the higher observation plane is preferably increased by 20km or more from the height of the original observation plane.

In the method, outcrop rock magnetic susceptibility and well drilling core magnetic susceptibility are analyzed and compared, if the magnetic susceptibility of basin sedimentary rock is generally very low and can be regarded as weak magnetization and non-magnetism, the basin regional magnetic anomaly field mainly reflects basin crystalline substrate magnetism (namely the basin regional magnetic anomaly can represent the basin substrate aeromagnetic anomaly, namely the aeromagnetic anomaly obtained by direct measurement), and at the moment, the basin regional magnetic anomaly corresponds to the basin substrate aeromagnetic anomaly.

In the method described above, the aeromagnetic anomalies of the basin foundation specifically correspond to the distribution of which basin foundation lithologic structure needs to be specifically analyzed according to the specific situation of each basin, and they can be routinely obtained by those skilled in the art.

In the above-described method, preferably, step 2: analyzing the burial depth of the basin foundation, comprising:

The buried depth of the basin foundation directly influences the gradient of the deep geothermal temperature and controls important factors of the distribution phase of deep oil gas.

In the method, the two-dimensional seismic survey line should be a two-dimensional seismic survey line capable of satisfying analysis requirements of the deep-layer structure of the basin, and a person skilled in the art can routinely determine whether the two-dimensional seismic survey line can satisfy the analysis requirements of the deep-layer structure of the basin.

The earth temperature obtained by the drill pipe in the drilling process can effectively reflect the earth temperature gradient of the well, but an effective means is lacked for the region which is not drilled. The single-well geothermal gradient can be obtained by combining single-well temperature data with the burial depth; analyzing the ground temperature gradients of different areas, and knowing that the structure of the top surface of the substrate and the ground temperature gradient are in overall negative correlation (the ground temperature gradient of the area with shallow buried depth of the substrate is higher, and the ground temperature gradient of the area with large buried depth of the substrate is lower); the temperature gradient of the area with the basement lithology of the new and ancient granite is higher than that of metamorphic rock (mainly influenced by the heat event of the new and ancient); therefore, the geothermal gradient is mainly determined by the buried depth (top surface structure) of the substrate and the lithologic structure of the substrate.

In the above method, preferably, in step 3, dividing the deep geothermal gradient zone according to the lithologic structure of the basin foundation and the burial depth of the basin foundation includes:

In the method, a person skilled in the art can determine the specific weight of the burial depth of the basin base and the lithologic structure of the basin base in the deep geothermal gradient zone respectively and different influence coefficients of different lithologic structures of the basin base according to the specific conditions of different basins, and divide the geothermal gradient zone into a plurality of deep geothermal gradient zones according to the geothermal gradient by combining with the existing exploration zone; the method of dividing the geothermal gradient zone into several deep geothermal gradient zones according to the existing exploration zone is also a conventional method in the art, and a person skilled in the art can also divide the geothermal gradient zone into several deep geothermal gradient zones according to the geothermal gradient according to the field requirement.

In the above method, preferably, in step 3, determining a geothermal gradient according to the deep geothermal gradient zone includes:

for a zone of the basal well drilling, directly obtaining a geothermal gradient according to the temperature data and the burial depth data;

and for zones which are not drilled and are drilled in a shallow layer, determining the geothermal gradient according to the correction of each deep geothermal gradient zone.

In the above-described method, preferably, in step 4, the relationship is represented by the following formula 1);

t ═ Δ T · D + C formula 1);

in formula 1): t is the formation temperature, DEG C; delta t is the ground temperature gradient, DEG C/m; d is depth, m; c is a constant.

The constant C in equation 1) may be the average of all constants in each linear fitting relationship between the single well temperature data and the burial depth data in the known region.

In the method described above, preferably, in step 4, predicting the deep-well hydrocarbon phase of the basin based on the obtained formation temperature includes:

Wherein, the temperature range of the oil-gas phase state of the deep layer of the basin is determined according to the thermal stability and the cracking limit temperature of the crude oil in the method, namely the temperature is between more than 220 ℃ and 200-220 ℃ and is less than 200 ℃.

In another aspect, the present invention further provides a device for predicting a deep hydrocarbon phase of a basin, wherein the device for predicting the deep hydrocarbon phase of the basin comprises:

a first analysis unit: for analyzing the distribution of the bedrock formation;

a second analysis unit: the method is used for analyzing the buried depth and the fluctuation form of the basin foundation;

In the above-mentioned apparatus, preferably, the first analysis unit is specifically configured to: and corresponding the lithology of the single well base and the year measuring information of the rocks to the aeromagnetic anomaly of the basin base, and restricting and analyzing the distribution of the lithology structure of the basin base.

In the above-described apparatus, preferably, the first analysis unit is further configured to:

In the above-described apparatus, the height of the higher observation plane is preferably increased by 20km or more from the height of the original observation plane.

In the above-mentioned apparatus, preferably, the second analysis unit is specifically configured to:

In the above-mentioned apparatus, preferably, the geothermal gradient determination unit is specifically configured to:

In the apparatus described above, preferably, the geothermal gradient determination unit is further configured to:

for a zone of the basal well drilling, directly obtaining a geothermal gradient according to the temperature data and the burial depth data;

and for zones which are not drilled and are drilled in a shallow layer, determining the geothermal gradient according to the correction of each deep geothermal gradient zone.

In the above-described device, preferably, the relationship is as shown in the following formula 1);

t ═ Δ T · D + C formula 1);

in formula 1): t is the formation temperature, DEG C; delta t is the ground temperature gradient, DEG C/m; d is depth, m; c is a constant.

In the above apparatus, preferably, the deep-basin hydrocarbon phase prediction unit is specifically configured to:

In yet another aspect, the present invention also provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of the method for predicting deep hydrocarbon phases of a basin.

In yet another aspect, the present invention also provides a computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the above method for predicting deep-basin hydrocarbon phases.

The method and the device provided by the invention identify the deep layer oil gas phase state through the deep layer geothermal gradient, solve the geological problems of deep layer geothermal gradient distribution, deep layer oil gas phase state and the like, and provide a basis for distinguishing the deep layer oil gas phase state.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a process flow diagram of a method for predicting a deep hydrocarbon phase of a basin according to an embodiment of the present invention.

FIG. 2 is a diagram of an anomaly of aeromagnetic field after the observation surface is raised by more than 20km in the embodiment of the present invention.

FIG. 3 is a schematic representation of the basement lithology of the Tarim basin in an embodiment of the present invention.

FIG. 4 is a top view of a full basin foundation and a top view of the foundation.

FIG. 5 is a graph of the relationship between single well temperature data and burial depth data in an embodiment of the invention.

FIG. 6 is a schematic diagram of a deep geothermal gradient zone in an embodiment of the invention.

FIG. 7 is a schematic structural diagram of a device for predicting a deep hydrocarbon phase of a basin provided in an embodiment of the present invention.

Detailed Description

In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.

FIG. 1 is a process flow diagram of a method for predicting a deep hydrocarbon phase of a basin according to an embodiment of the invention. As shown in FIG. 1, the method for predicting the oil-gas phase state of the deep layer of the basin comprises the following steps:

step 1: analyzing the distribution of the bedrock structure;

step 2: analyzing the buried depth and the fluctuation form of the basin foundation;

The execution subject of the method for predicting the oil-gas phase state of the deep layer of the basin region shown in FIG. 1 can be a computer. As can be seen from the process shown in FIG. 1, the method provided by the invention identifies the deep oil-gas phase through the deep geothermal gradient, solves the geological problems of deep geothermal gradient distribution, deep oil-gas phase and the like, and provides a basis for distinguishing the deep oil-gas phase.

In one embodiment, step 1: analyzing the distribution of basin basement lithologic structures includes:

In one embodiment, acquiring aeromagnetic anomalies of the basin floor comprises:

In one embodiment, the height of the higher observation plane is increased by more than 20km compared with the original observation plane.

In one embodiment, step 2: analyzing the burial depth of the basin foundation, comprising:

In an embodiment, in step 3, dividing the deep geothermal gradient zone according to the lithologic structure of the basin foundation and the buried depth of the basin foundation includes:

In one embodiment, in step 3, determining the geothermal gradient according to the deep geothermal gradient zone includes:

for a zone of the basal well drilling, directly obtaining a geothermal gradient according to the temperature data and the burial depth data;

and for zones which are not drilled and are drilled in a shallow layer, determining the geothermal gradient according to the correction of each deep geothermal gradient zone.

In one embodiment, in step 4, the relationship is shown in the following formula 1);

t ═ Δ T · D + C formula 1);

in formula 1): t is the formation temperature, DEG C; delta t is the ground temperature gradient, DEG C/m; d is depth, m; c is a constant.

In one embodiment, in step 4, predicting the deep-well hydrocarbon phase of the basin based on the obtained formation temperature includes:

One of the specific embodiments of the present invention is as follows:

in the specific embodiment, taking the Tarim basin as an example, the method for predicting the deep oil-gas phase state of the Tarim basin specifically comprises the following steps:

(1) analyzing distribution characteristics of basic lithologic structure of Tarim basin

Comparing the magnetic susceptibility of the rock counted by the outcrop area and the drill core, the magnetic abnormal field of the area of the Tarim basin mainly reflects the difference of the magnetic property and the structural form of the basin crystalline substrate and the two-cascade igneous rock. In order to more rapidly attenuate high-frequency anomalies generated by a geologic body with small scale and shallow buried depth, low-frequency anomalies generated by a geologic body with large scale and deep buried depth are highlighted, and a aeromagnetic anomaly observation surface is improved by more than 20km, so that the aeromagnetic anomalies of a Tarim basin base are corresponded, as shown in figure 2.

Counting the results of year measurement analysis of rocks around and in the basin by the predecessors in recent years, corresponding the basement lithology and year measurement information of a single well to the basement aeromagnetic anomaly, and constraining analysis of the basement lithology structure. The structure diagram of the basement lithology of the Tarim basin is shown in FIG. 3, which is mainly summarized as the following points according to the contents in FIG. 3: (1) the north part of the basin is a mild negative anomaly, namely middle-new ancient shallow metamorphic rock; (2) the center of the basin is just abnormal in the east-west direction, and is reconstructed by superposing ancient granite with new ancient granite; (3) the south of the basin is mainly provided with magnetic anomalies in the northeast direction, positive anomalies and negative anomalies are mutually separated into strip-shaped distributions, the positive anomalies correspond to the new ancient granite, and the negative anomalies are the middle and new ancient metamorphic rocks; (4) the southeast part of the basin is mainly the northern-east negative abnormality, which is the late ancient metamorphic rock. In general, the northern part of the base of the Tarim basin is shallow metamorphic rock in the New Yuan ancient boundary, and the southern part of the basin is strongly influenced by the thermal events of the New Yuan ancient structure.

(2) Analysis of the depth of burial of the base of a Tarim basin

The spliced seismic large section 74 bars are newly processed in the Tarim basin in recent years, so that the two-dimensional survey line of the basin can be better covered, and the analysis requirement of the deep structure of the basin is met. Through well-seismic calibration, seismic reflection characteristic analysis and tracking, the reflection between the overburden layer on the substrate and the substrate is identified, and then a top surface structure diagram and a substrate top surface burial depth diagram of the whole basin substrate are obtained, as shown in fig. 4.

And analyzing the buried depth and the fluctuation form of the basin base by using a structural diagram of the top surface of the basin base of the Tarim, wherein the deepest part of the basin is positioned in the full-Call depression for more than 15km, the depth of the Bachu bump is 3-6km, a bump zone in the tower is 7-8km, the depth of the Arva fracture depression base is more than 10km, the northern Bayer zone base of the Tarim is about 6-9km, and the overall buried depth of the southern base is shallower than the overall buried depth of the northern part.

(3) Division of deep geothermal gradient zone

The earth temperature obtained by the drill pipe in the drilling process can effectively reflect the earth temperature gradient of the well, but an effective means is lacked for the region which is not drilled. By combining single-well temperature data with the burial depth (as shown in figure 5), the geothermal gradient of a single well can be obtained; analyzing the ground temperature gradients of different areas, and knowing that the structure of the top surface of the substrate and the ground temperature gradient are in overall negative correlation (the ground temperature gradient of the area with shallow buried depth of the substrate is higher, and the ground temperature gradient of the area with large buried depth of the substrate is lower); the temperature gradient of the area with the basement lithology of the new and ancient granite is higher than that of metamorphic rock (mainly influenced by the heat event of the new and ancient); therefore, the geothermal gradient is mainly determined by the buried depth (top surface structure) of the substrate and the lithologic structure of the substrate.

Specifically, in the prediction of geothermal gradient, the weight of the substrate top surface structure in the deep geothermal gradient evaluation zone is 3/4, and the lithology of the substrate is 1/4; wherein the influence of the lithology of the substrate on the new and ancient granite is 1, the influence of the ancient and ancient granite is 0.75, the influence of the medium and new ancient metamorphic rock is 0.5, and the influence of the substrate on the medium and new ancient shallow metamorphic rock is 0; in conjunction with the current survey zone, the geothermal gradient zone can be divided in this way from low-medium-high into five categories of zones (as shown in FIG. 6).

For a zone of the basal well drilling, directly obtaining a geothermal gradient according to the temperature data and the burial depth data;

and for zones which are not drilled and are drilled in a shallow layer, determining the geothermal gradient according to the correction of each deep geothermal gradient zone.

(4) Establishing a relational expression of the formation temperature, the earth temperature gradient and the depth, wherein the relational expression is shown as the following formula 1);

t ═ Δ T · D + C formula 1);

in formula 1): t is the formation temperature, DEG C; delta t is the ground temperature gradient, DEG C/m; d is depth, m; and C is a constant, and the constant C can be the average value of all constants in each linear fitting relation between the temperature data and the burial depth data of each single well in the known area.

Substituting the depth and the geothermal gradient determined in the step (3) into the relational expression to obtain the formation temperature, and predicting the deep oil-gas phase of the basin according to the obtained formation temperature and the following standards;

In this embodiment, a relationship between the temperature and the depth of the deep formation of the basin is fitted by counting the depth and the temperature of the full basin: t is 0.022D +15, and then the constant C value in the relational expression of the formation temperature, the geothermal gradient and the depth of five deep geothermal gradient zones divided by the whole basin is determined to be 15;

as can be seen from FIG. 6, the buried depth of the substrate in the ancient city-towndow area is shallow, the substrate mainly comprises granite and belongs to a high geothermal gradient zone, and the fitting formula of the formation temperature and the depth is statistically calculated as: t ═ 0.024D + 15;

the basement buried depth is larger in the north tower uplift area, the basement mainly comprises shallow metamorphic rocks and belongs to a medium-low ground temperature gradient zone, and the relation between the formation temperature and the depth is T0.019-D + 15;

the ancient city-towndong area is taken as the highest geothermal gradient zone, the township is taken as a middle-low (secondary low) geothermal gradient zone, the two geothermal gradient zones are taken as marked lines, and geothermal gradients delta t can be obtained by linear interpolation arrangement;

the depth of a buried base in the southwest area of the tower is shallow, the lithology of the base is complex, the area belongs to a secondary high ground temperature gradient zone (corresponding to a Bachu uplift area), and a fitting formula of the formation temperature and the depth is systematically calculated as follows: T-0.0223D + 15;

the slope of the wheat embankment is similar to the buried depth of a raised substrate in the tower, the lithology of the substrate is mainly metamorphic rock, the local lithology of the substrate is influenced by granite, and the substrate belongs to a medium and high ground temperature gradient zone, and the formation temperature and depth fitting formula is statistically calculated as follows: t ═ 0.0207D + 15;

the dip-the depression of the alvarez has the largest burial depth of the depression basement, the basement is mainly superficial deterioration and belongs to a low geothermal gradient zone, and the relation between the formation temperature and the depth is T0.0174D + 15;

the buried depth data of the different geothermal gradient zones are shown as follows, the formation temperature is determined according to the buried depth data of the different geothermal gradient zones and the relationship between the formation temperature and the depth corresponding to each different geothermal gradient zone, and the oil-gas phase state of the deep layer of the basin is predicted according to the formation temperature according to the following standards;

High geothermal gradient zone: the buried depth is less than 7700m, the corresponding formation temperature is 199.8 ℃, and the deep layer of the basin is defined as an oil-gas phase distribution area according to the above standards; the buried depth is more than 8600m, the corresponding stratum temperature is 221.4 ℃, and the deep layer of the basin is defined as a natural gas distribution area according to the above standards;

second highest geothermal gradient zone: the buried depth is less than 8200m, the corresponding stratum temperature is 197.86 ℃, and the deep layer of the basin is defined as an oil-gas phase distribution area according to the above standards; the buried depth is more than 9200m, the corresponding stratum temperature is 220.16 ℃, and the deep layer of the basin is defined as a natural gas distribution area according to the above standard;

medium and high geothermal gradient zone: the buried depth is less than 8900m, the corresponding formation temperature is 199.23 ℃, and the deep layer of the basin is defined as an oil-gas phase distribution area according to the above standards; the buried depth is more than 10000m, the corresponding stratum temperature is 222 ℃, and the deep layer of the basin is defined as a natural gas distribution area according to the above standards;

medium-low ground temperature gradient band: the buried depth is less than 9700m, the corresponding formation temperature is 199.3 ℃, and the deep layer of the basin is defined as an oil-gas phase distribution area according to the above standards; the buried depth is more than 10800m, the corresponding formation temperature is 220.2 ℃, and the deep layer of the basin is defined as a natural gas distribution area according to the above standards;

low geothermal gradient zone: the buried depth is less than 10600m, the corresponding formation temperature is 199.44 ℃, and the deep layer of the basin is defined as an oil-gas phase distribution area according to the above standards; the buried depth is more than 11800m, the corresponding formation temperature is 220.32 ℃, and the deep layer of the basin is defined as a natural gas distribution area according to the above standards.

Based on the same inventive concept, the embodiment of the invention also provides a system for predicting the oil-gas phase state of the deep layer of the basin, and as the problem solving principle of the system is similar to the method for predicting the oil-gas phase state of the deep layer of the basin, the implementation of the system can refer to the implementation of the method, and repeated parts are not described again. FIG. 7 is a schematic structural diagram of a system for predicting a deep hydrocarbon phase of a basin according to an embodiment of the present invention. As shown in fig. 7, the system for predicting the oil-gas phase state of the deep layer of the basin includes:

first analysis unit 101: for analyzing the distribution of the bedrock formation;

the second analysis unit 102: the method is used for analyzing the buried depth and the fluctuation form of the basin foundation;

the geothermal gradient determination unit 103: the deep geothermal gradient zone is divided according to the lithologic structure of the basin foundation and the buried depth of the basin foundation, and the geothermal gradient is determined according to the deep geothermal gradient zone;

the basin deep layer oil gas phase prediction unit 104: the system is used for establishing a relational expression of the formation temperature, the geothermal gradient and the depth of each deep geothermal gradient zone, substituting the geothermal gradient determined by the depth and geothermal gradient determining unit into the relational expression of the corresponding deep geothermal gradient zone to obtain the formation temperature, and predicting the oil-gas phase state of the deep layer of the basin according to the obtained formation temperature.

In an embodiment, the first analysis unit is specifically configured to: and corresponding the lithology of the single well base and the year measuring information of the rocks to the aeromagnetic anomaly of the basin base, and restricting and analyzing the distribution of the lithology structure of the basin base.

In an embodiment, the first analysis unit is further configured to:

In one embodiment, the height of the higher observation plane is increased by more than 20km compared with the original observation plane.

In an embodiment, the second analysis unit is specifically configured to:

In an embodiment, the geothermal gradient determining unit is specifically configured to:

In an embodiment, the geothermal gradient determining unit is further configured to:

for a zone of the basal well drilling, directly obtaining a geothermal gradient according to the temperature data and the burial depth data;

and for zones which are not drilled and are drilled in a shallow layer, determining the geothermal gradient according to the correction of each deep geothermal gradient zone.

In one embodiment, the relationship is shown in the following formula 1);

t ═ Δ T · D + C formula 1);

in formula 1): t is the formation temperature, DEG C; delta t is the ground temperature gradient, DEG C/m; d is depth, m; c is a constant.

In an embodiment, the deep-basin hydrocarbon phase prediction unit is specifically configured to:

The device provided by the embodiment of the invention identifies the deep oil-gas phase through the deep geothermal gradient, solves the geological problems of deep geothermal gradient distribution, deep oil-gas phase and the like, and provides a basis for distinguishing the deep oil-gas phase.

The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the steps of the method for predicting the deep-layer oil-gas phase state of the basin when executing the computer program.

The computer equipment provided by the embodiment of the invention identifies the deep oil-gas phase through the deep geothermal gradient, solves the geological problems of deep geothermal gradient distribution, deep oil-gas phase and the like, and provides a basis for distinguishing the deep oil-gas phase.

Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method for predicting deep-basin hydrocarbon phase as described above.

The computer-readable storage medium provided by the embodiment of the invention identifies the deep oil-gas phase through the deep geothermal gradient, solves the geological problems of deep geothermal gradient distribution, deep oil-gas phase and the like, and provides a basis for distinguishing the deep oil-gas phase.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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.

The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.

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Method and device for predicting oil-gas phase state of deep layer of basin

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