阅读说明：本技术 一种复杂断块油田层位快速解释方法 (Method for quickly explaining complex fault block oil field horizon ) 是由 张显文 杜昕 范廷恩 张晶玉 高云峰 蔡文涛 *** 范洪军 王海峰 马良涛 于 2019-10-12 设计创作，主要内容包括：本发明公开了一种复杂断块油田层位快速解释方法,包括以下步骤：1)对待解释地震数据进行解释性处理；2)利用方差体技术,提取解释性处理后的地震数据中的解释目的层附近的方差体属性切片,将断层解释成果投影于方差体属性切片上,根据断层平面形态初步编制断层多边形,作为层位解释的平面底图；3)选择步骤2)中获得的平面底图所反映的具有相对简单构造的大断块,进行大断块内部层位解释；4)对步骤3)中的断块内的层位解释进行质控；5)进行断块间的层位解释；6)重复步骤3)～5),进行下一个断块内部层位解释,直到完成工区内所有大断块内部的层位解释,完成整个工区层位解释。(The invention discloses a method for quickly explaining a complex fault block oil field horizon, which comprises the following steps: 1) performing explanatory processing on the seismic data to be explained; 2) extracting variance body attribute slices near an interpretation target layer in the seismic data after the explanatory processing by using a variance body technology, projecting fault interpretation results on the variance body attribute slices, and primarily compiling fault polygons according to fault plane forms to be used as plane base maps of the horizon interpretation; 3) selecting a large fault block with a relatively simple structure reflected by the plane base map obtained in the step 2), and performing internal horizon interpretation on the large fault block; 4) carrying out quality control on the horizon interpretation in the fault block in the step 3); 5) performing horizon interpretation between the broken blocks; 6) and repeating the steps 3) -5) to perform next fault block internal layer interpretation until the layer interpretation of all the large fault blocks in the work area is completed, and completing the whole work area layer interpretation.)

1. A method for quickly explaining a complex fault block oil field horizon is characterized by comprising the following steps:

1) the seismic data to be explained are subjected to explanatory processing, so that the data quality is improved, and the seismic reflection event spatial continuity is enhanced;

2) extracting variance body attribute slices near an interpretation target layer in the seismic data subjected to the interpretative processing in the step 1) by utilizing a variance body technology, projecting fault interpretation results on the variance body attribute slices to form a fault plane shape, and primarily compiling fault polygons according to the fault plane shape to serve as a plane base map of the horizon interpretation;

3) selecting a large fault block with a relatively simple structure reflected by the plane base map obtained in the step 2), alternately extracting a regular survey line seismic section in the fault block, and performing horizon interpretation to complete horizon interpretation inside the large fault block;

4) carrying out quality control on the horizon interpretation in the fault block in the step 3);

5) using the fault blocks which finish the horizon interpretation quality control in the step 4) as guidance, gradually radiating the horizon interpretation in the guidance fault blocks through the intersected regular survey line seismic sections in the transition areas between the fault blocks, and gradually extending the predatory to the next fault block to finish the horizon interpretation between the fault blocks;

6) and repeating the steps 3) to 5) until the horizon interpretation inside all the large fault blocks in the work area is finished, and finishing the horizon interpretation of the whole work area.

2. The method for rapidly interpreting complex fault block oilfield horizons according to claim 1,

in the step 3), the process of interpreting the internal horizon of the large fault block is as follows:

i) extracting a first regular survey line seismic section of the well from the seismic data subjected to the interpretative processing in the step 1), determining the position of the inner layer of the large fault block according to geological stratification information on the well, and performing layer interpretation on the first regular survey line seismic section;

ii) extracting a second regular line-measuring seismic section from the seismic data subjected to the explanatory processing in the step 1), wherein the second regular line-measuring seismic section intersects with the first regular line-measuring seismic section in the step i), and a horizon interpretation result on the first regular line-measuring seismic section in the step i) is projected on the second regular line-measuring seismic section, and the horizon interpretation on the second regular line-measuring seismic section is carried out according to the projection;

iii) extracting a third regular line-measuring seismic section from the seismic data subjected to the explanatory processing in the step 1), wherein the third regular line-measuring seismic section intersects with the second regular line-measuring seismic section in the step ii), and a horizon interpretation result on the second regular line-measuring seismic section in the step ii) is projected on the third regular line-measuring seismic section, and the horizon interpretation on the third regular line-measuring seismic section is carried out according to the projection;

iv) repeating the steps ii) and iii), alternately extracting a fourth regular measuring line seismic section and a fifth regular measuring line seismic section … … from the seismic data subjected to the interpretive processing in the step 1), completing the horizon interpretation on the next regular measuring line seismic section according to the projection of the horizon interpretation of the previous regular measuring line seismic section on the next regular measuring line seismic section, and completing the horizon interpretation inside the selected large fault block.

3. The method for rapidly interpreting complex fault block oilfield horizons according to claim 1,

in the step 4), the quality control process is as follows:

extracting a plurality of seismic survey lines in any direction which do not cross the fault and are filled in the whole fault block simultaneously from the inside of the large fault block in the step 3) to form a random line section assembly;

according to whether the projection of the horizon interpretation on the survey line seismic section on any line section combination in the step 3) is continuous or not, quality control is carried out on the internal horizon interpretation of the fault block in the step 3), wherein if the projection is continuous, the internal horizon interpretation of the fault block in the step 3) meets the interpretation requirement; and if the projection is discontinuous, repeating the steps 3) and 4), and correcting the interpretation of the internal horizon of the fault block in the step 3) until the projection is continuous, thereby finishing the quality control of the interpretation of the internal horizon of the fault block.

4. The method for rapidly interpreting complex fault block oilfield horizons according to claim 1,

in the step 5), the inter-block horizon interpretation process is performed as follows:

a) extracting a regular survey line seismic section which passes through the guide fault block and is positioned near the junction of the guide fault block and the next fault block, and performing horizon interpretation on the regular survey line seismic section;

b) extracting a regular survey line seismic section which is intersected with the regular survey line seismic section in the step a) and is positioned at the position where the two fault blocks are connected, and performing horizon interpretation;

c) then extracting a regular survey line seismic section which is intersected with the regular survey line seismic section in the step b) and passes through the next fault block, and performing horizon interpretation, so that the horizon interpretation result inside the fault block in the step 3) is gradually radiated into the next fault block to finish horizon interpretation between the fault blocks;

in the above steps, a regular inline seismic section is extracted around a fault, and if a regular inline seismic section that can bypass the fault cannot be found, the regular inline seismic section is extracted from the position with the minimum fault distance across the fault, and horizon interpretation is performed on the regular inline seismic section across the fault.

5. The method for rapidly interpreting the complex fault block oilfield horizon according to any one of claims 1 to 4, wherein the method comprises the following steps:

the horizon interpretation method is a method combining manual identification and horizon automatic tracking.

6. The method for rapidly interpreting the complex fault block oilfield horizon according to any one of claims 1 to 4, wherein the method comprises the following steps:

the regular geodesic seismic section is a main geodesic seismic section or a crossline seismic section.

7. The method for rapidly interpreting the horizon of the complex fault block oilfield according to claim 1, wherein the method comprises the following steps:

in the step 1) above, the explanatory processing includes explanatory processing such as median filtering, low-pass filtering, and the like; the seismic data to be interpreted refers to the raw seismic data obtained from the seismic data.

Technical Field

The invention relates to a seismic horizon interpretation method suitable for adjusting a subsurface excavation stage in the middle and later stages of oil and gas field development, in particular to a rapid interpretation method for a complex fault block oil field horizon.

Background

The fault of the complex fault block oil and gas field develops for multiple times, and the fracture system is complex. After the oil field enters the middle and later development stages, the construction implementation degree directly determines the oil field development and adjustment effect, and is the key for residual oil distribution prediction and well design adjustment implementation. In recent years, with the progress of three-dimensional seismic data acquisition and processing technology, a full three-dimensional interpretation technology taking full-automatic interpretation of a three-dimensional space as a core is rapidly developed. The technology sets spatial seed points according to geological knowledge, and realizes the explanation of a horizon and a fault and the carving of the top and the bottom of a sand body through automatic tracking. The technology has good application effect under the conditions of simple underground structure and better data quality. However, the application condition of the technology is too ideal, and various complex geological conditions exist in the practical production application, particularly in complex fault block type oil fields, the structural form is complex, and the seismic data quality is poor. The application effect of the technology is poor, and the problems of layer position interpretation unclosing, layer string, layer jump and the like exist. In this context, the horizon interpretation work of the oil field returns to the track of the two-dimensional interpretation of the three-dimensional data. Constructing a well-connecting backbone section based on the well, establishing an interpretation scheme, extending the interpretation scheme section by section, and seeking the closing of the horizon in the space. The horizon interpretation is realized by using a line-surface-body idea and using a main measuring line and a connecting line after the three-dimensional work area is thinned as a frame and gradually encrypting the measuring line interpretation. However, for a large three-dimensional data volume, the horizon tracking is performed according to a two-dimensional interpretation method, and the problems of large horizon closure difference and repeated modification are caused, so that the working efficiency is seriously influenced. In addition, when the traditional method is used for horizon interpretation in a complex fault block oil field, fault properties, whether deposition is controlled or not, the fault distance of an upper plate and a lower plate, the stratum thickness relation, the profile wave group characteristics and the like are also considered. This has high experience requirements for the interpreter and uncertainty. Especially, the horizon interpretation across the fault is difficult to meet the requirement of development precision.

Therefore, how to effectively mine the intrinsic information contained in the three-dimensional data and improve the accuracy and efficiency of the horizon interpretation of the complex fault block oil field to a greater extent is a problem which needs to be solved urgently in the current seismic horizon interpretation work.

Disclosure of Invention

Aiming at the problems, the invention aims to provide a method for quickly explaining the horizon of a complex fault block oil field, which can improve the precision and efficiency of explaining the horizon of the complex fault block oil field.

In order to achieve the purpose, the invention adopts the following technical scheme, and the method for quickly explaining the horizon of the complex fault block oil field is characterized by comprising the following steps of:

1) the seismic data to be explained are subjected to explanatory processing, so that the data quality is improved, and the seismic reflection event spatial continuity is enhanced;

2) extracting variance body attribute slices near an interpretation target layer in the seismic data subjected to the interpretative processing in the step 1) by utilizing a variance body technology, projecting fault interpretation results on the variance body attribute slices to form a fault plane shape, and primarily compiling fault polygons according to the fault plane shape to serve as a plane base map of the horizon interpretation;

3) selecting a large fault block with a relatively simple structure reflected by the plane base map obtained in the step 2), alternately extracting a regular survey line seismic section in the fault block, and performing horizon interpretation to complete horizon interpretation inside the large fault block;

4) carrying out quality control on the horizon interpretation in the fault block in the step 3);

5) using the fault blocks which finish the horizon interpretation quality control in the step 4) as guidance, gradually radiating the horizon interpretation in the guidance fault blocks through the intersected regular survey line seismic sections in the transition areas between the fault blocks, and gradually extending the predatory to the next fault block to finish the horizon interpretation between the fault blocks;

6) and repeating the steps 3) to 5) until the horizon interpretation inside all the large fault blocks in the work area is finished, and finishing the horizon interpretation of the whole work area.

Further, in the step 3), the process of interpreting the internal horizon of the large fault block is as follows:

i) extracting a first regular survey line seismic section of the well from the seismic data subjected to the interpretative processing in the step 1), determining the position of the inner layer of the large fault block according to geological stratification information on the well, and performing layer interpretation on the first regular survey line seismic section;

ii) extracting a second regular line-measuring seismic section from the seismic data subjected to the explanatory processing in the step 1), wherein the second regular line-measuring seismic section intersects with the first regular line-measuring seismic section in the step i), and a horizon interpretation result on the first regular line-measuring seismic section in the step i) is projected on the second regular line-measuring seismic section, and the horizon interpretation on the second regular line-measuring seismic section is carried out according to the projection;

iii) extracting a third regular line-measuring seismic section from the seismic data subjected to the explanatory processing in the step 1), wherein the third regular line-measuring seismic section intersects with the second regular line-measuring seismic section in the step ii), and a horizon interpretation result on the second regular line-measuring seismic section in the step ii) is projected on the third regular line-measuring seismic section, and the horizon interpretation on the third regular line-measuring seismic section is carried out according to the projection;

iv) repeating the steps ii) and iii), alternately extracting a fourth regular measuring line seismic section and a fifth regular measuring line seismic section … … from the seismic data subjected to the interpretive processing in the step 1), completing the horizon interpretation on the next regular measuring line seismic section according to the projection of the horizon interpretation of the previous regular measuring line seismic section on the next regular measuring line seismic section, and completing the horizon interpretation inside the selected large fault block.

Further, in the step 4), the quality control process is as follows:

extracting a plurality of seismic survey lines in any direction which do not cross the fault and are filled in the whole fault block simultaneously from the inside of the large fault block in the step 3) to form a random line section assembly;

according to whether the projection of the horizon interpretation on the survey line seismic section on any line section combination in the step 3) is continuous or not, quality control is carried out on the internal horizon interpretation of the fault block in the step 3), wherein if the projection is continuous, the internal horizon interpretation of the fault block in the step 3) meets the interpretation requirement; and if the projection is discontinuous, repeating the steps 3) and 4), and correcting the interpretation of the internal horizon of the fault block in the step 3) until the projection is continuous, thereby finishing the quality control of the interpretation of the internal horizon of the fault block.

Further, in the step 5), the inter-block horizon interpretation process is performed as follows:

a) extracting a regular survey line seismic section which passes through the guide fault block and is positioned near the junction of the guide fault block and the next fault block, and performing horizon interpretation on the regular survey line seismic section;

b) extracting a regular survey line seismic section which is intersected with the regular survey line seismic section in the step a) and is positioned at the position where the two fault blocks are connected, and performing horizon interpretation;

c) then extracting a regular survey line seismic section which is intersected with the regular survey line seismic section in the step b) and passes through the next fault block, and performing horizon interpretation, so that the horizon interpretation result inside the fault block in the step 3) is gradually radiated into the next fault block to finish horizon interpretation between the fault blocks;

in the above steps, a regular inline seismic section is extracted around a fault, and if a regular inline seismic section that can bypass the fault cannot be found, the regular inline seismic section is extracted from the position with the minimum fault distance across the fault, and horizon interpretation is performed on the regular inline seismic section across the fault.

Further, the horizon interpretation method is a method combining manual identification and horizon automatic tracking.

Further, the regular line seismic section is a main line seismic section or a crossline seismic section.

Further, in the step 1) above, the explanatory processing includes explanatory processing such as median filtering, low-pass filtering, and the like; the seismic data to be interpreted refers to the raw seismic data obtained from the seismic data.

By adopting the technical scheme, the invention has the following advantages: the core of the invention is the horizon interpretation taking the fault block as a guide or a unit, taking 'kang mat weaving' as a means, 'Chuanmu-Tong' as quality control and 'fault winding' as strategies, and rapidly finishing the horizon interpretation of the complex fault block oil field. Compared with the traditional two-dimensional horizon interpretation technology, the technology has higher working efficiency and interpretation precision, is more suitable for complex fault block type oil and gas fields compared with the traditional three-dimensional horizon interpretation technology, and can ensure the space closure of the interpretation horizon.

Drawings

FIG. 1 is a schematic flow diagram of the present invention;

FIG. 2 is an explanatory seismic data set for a complex fault block field horizon interpretation;

FIG. 3 is a horizon interpretation base map formed by superposition of variance body attributes of the oilfield fault interpretation result;

in FIG. 4, FIG. 4A is a schematic representation of the in-plane location of a main line seismic section ① of a cross-well, FIG. 4A is a schematic representation of a main line seismic section ① of a cross-well, FIG. 4B is a schematic representation of the in-plane location of a crossline seismic section ②, and FIG. 4B is a schematic representation of a crossline seismic section ②;

in FIG. 5, FIG. 5A is a schematic illustration of the location of main line seismic section ③ on a plane, FIG. 5A is a schematic illustration of main line section ③, FIG. 5B is a schematic illustration of the location of crossline seismic section ④ on a plane, and FIG. 5B is a schematic illustration of crossline seismic section ④;

FIG. 6 is a schematic diagram of the oil field horizon interpretation for quality control of the horizon interpretation on the rule survey line by interpreting the projection result on the rule line with the horizon on any line when the oil field horizon interpretation is quality controlled in the 'serial-parallel' manner;

in FIG. 7, FIG. 7a is a schematic plan view of a regular line seismic section in the fault block transition region, FIG. 7b is a schematic plan view of the main line seismic section ① of FIG. 7a, FIG. 7c is a schematic plan view of the crossline seismic section ② of FIG. 7a, and FIG. 7d is a schematic plan view of the main line section ③ of FIG. 7 a.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in FIG. 1, the invention provides a method for quickly interpreting a complex fault block oil field horizon, which comprises the following steps:

1) the seismic data to be explained are subjected to explanatory processing, so that the data quality is improved, and the seismic reflection event spatial continuity is enhanced;

wherein, the explanatory processing comprises the explanatory processing such as median filtering, low-pass filtering and the like; the seismic data to be interpreted refers to the raw seismic data obtained from the seismic data.

2) Extracting variance body attribute slices near an interpretation target layer in the seismic data subjected to the interpretative processing in the step 1) by utilizing a variance body technology, projecting fault interpretation results on the variance body attribute slices to form a fault plane shape, and primarily compiling fault polygons according to the fault plane shape to serve as a plane base map of the horizon interpretation;

wherein, the fault interpretation result is obtained by adopting the conventional fault interpretation technology to interpret the fault of the work area.

3) Selecting large fault blocks with relatively simple structures reflected by the plane base map obtained in the step 2), and alternately extracting regular survey line seismic sections in the fault blocks and performing horizon interpretation; the method called as 'weaving kang mat' is used for finishing the interpretation of the internal horizon of the large fault block; the specific content comprises the following steps:

i) extracting a first regular survey line seismic section of the well from the seismic data subjected to the interpretative processing in the step 1), determining the position of the inner layer of the large fault block according to geological stratification information on the well, and performing layer interpretation on the first regular survey line seismic section;

ii) extracting a second regular line-measuring seismic section from the seismic data subjected to the explanatory processing in the step 1), wherein the second regular line-measuring seismic section intersects with the first regular line-measuring seismic section in the step i), and a horizon interpretation result on the first regular line-measuring seismic section in the step i) is projected on the second regular line-measuring seismic section, and the horizon interpretation on the second regular line-measuring seismic section is carried out according to the projection;

iii) extracting a third regular line-measuring seismic section from the seismic data subjected to the explanatory processing in the step 1), wherein the third regular line-measuring seismic section intersects with the second regular line-measuring seismic section in the step ii), and a horizon interpretation result on the second regular line-measuring seismic section in the step ii) is projected on the third regular line-measuring seismic section, and the horizon interpretation on the third regular line-measuring seismic section is carried out according to the projection;

iv) repeating the steps ii) and iii), alternately extracting fourth and fifth … … regular line-measuring seismic sections from the seismic data subjected to the interpretive processing in the step 1), and completing the horizon interpretation on the next regular line-measuring seismic section according to the projection of the horizon interpretation of the previous regular line-measuring seismic section on the next regular line-measuring seismic section, so that the regular line-measuring seismic sections form mutual coupling and mutual constraint relations, and completing the horizon interpretation inside the selected large fault block in a simple to complex and circular parallel mode.

4) Based on a core thought of 'no-right-left', the horizon interpretation in the fault block in the step 3) is subjected to quality control in a 'serial-same' manner; the quality control process is as follows:

extracting a plurality of seismic survey lines in any direction which do not cross the fault and simultaneously fill the whole fault block as much as possible from the inside of the large fault block in the step 3) to form a random line section assembly;

according to whether the level explanation on the seismic profile of any regular survey line (including a main survey line and an interconnection survey line) in the step 3) is continuously projected on any line profile combination or not, quality control is carried out on the level explanation inside the fault block in the step 3), wherein if the projection is continuous, the level explanation inside the fault block in the step 3) meets the explanation requirement; and if the projection is discontinuous, repeating the steps 3) and 4), and correcting the interpretation of the internal horizon of the fault block in the step 3) until the projection is continuous, thereby finishing the quality control of the interpretation of the internal horizon of the fault block.

5) Using the large fault block subjected to the horizon interpretation quality control in the step 4) as a guide, namely as a guide fault block to wind a fault interpretation horizon; gradually radiating the horizon interpretation in the guide blocks through the intersected regular survey line seismic sections in the transition areas between the blocks, gradually extending the predatory into the next block, and finishing the horizon interpretation between the blocks; the specific process is as follows:

a) extracting a regular survey line seismic section which passes through the guide fault block and is positioned near the junction of the guide fault block and the next fault block, and performing horizon interpretation on the regular survey line seismic section;

b) extracting a regular survey line seismic section which is intersected with the regular survey line seismic section in the step a) and is positioned at the position where the two fault blocks are connected, and performing horizon interpretation;

c) then extracting a regular survey line seismic section which is intersected with the regular survey line seismic section in the step b) and passes through the next fault block, and performing horizon interpretation, so that a horizon interpretation result inside the guide fault block is gradually radiated into the next fault block to finish horizon interpretation between the fault blocks;

it is to be noted that, in the above-described steps, if a regular inline seismic section capable of bypassing a fault is not actually found, a regular inline seismic section is extracted from a fault section where the fault distance is minimum across the fault, and horizon interpretation is performed across the fault on the regular inline seismic section.

6) And repeating the steps 3) -5) to perform next fault block internal layer interpretation until the layer interpretation of all the large fault blocks in the work area is completed, and completing the whole work area layer interpretation.

Further, the horizon interpretation method in the invention is a method combining manual identification and horizon automatic tracking.

Further, in the above steps 3) to 5), the regular line seismic section is a main line seismic section or a crossline seismic section.

The invention is further explained by taking a complex fault block type oil field entering the middle and later stages of development as an example, as shown in fig. 1, the method for quickly explaining the horizon of the complex fault block oil field provided by the embodiment comprises the following steps:

1) the seismic data used for horizon interpretation in the oil field are subjected to interpretative processing such as median filtering, low-pass filtering and the like, so that the data quality is improved, the seismic reflection event spatial continuity is enhanced, and the seismic data after the interpretative processing (shown in figure 2) are obtained.

2) Extracting a variance body attribute slice near an interpretation target layer in the seismic data subjected to the interpretative processing in the step 1) by utilizing a variance body technology, projecting a fault interpretation result on the variance body attribute slice to form a fault plane shape, and primarily compiling a fault polygon according to the fault plane shape to be used as a plane base map of horizon interpretation (as shown in figure 3).

Fault interpretation results are obtained by adopting the conventional existing fault interpretation technology to interpret the fault of the work area.

3) As shown in fig. 4 and 5, a large fault block with a relatively simple structure carved on a plane bottom diagram is selected by means of weaving a heatable brick bed mat, and the internal horizon of the large fault block is explained;

firstly, extracting a main survey line seismic section ① (shown in fig. 4A) of the well from the seismic data subjected to the interpretive processing in the step 1), determining the position of a horizon in a fault block according to geological stratification information on the well, and performing horizon interpretation on a main survey line seismic section ① (shown in fig. 4A);

secondly, extracting a crossline seismic section ② (shown in fig. 4B) intersecting the main line seismic section ①, and performing fault block internal horizon interpretation (shown in fig. 4B) according to the projection of the interpretation result in the main line seismic section ① on the crossline seismic section ②;

and thirdly, alternately extracting a main survey line seismic section ③ (shown in FIG. 5A) and a crossline seismic section ④ (shown in FIG. 5B), alternately performing horizon interpretation on the main survey line seismic section ③ and the crossline seismic section ④ (shown in FIGS. 5A and 5B), and guiding to finish the horizon interpretation inside a fault block on the current section according to the projection of the previous section horizon interpretation.

4) (as shown in fig. 6), based on the core idea of "not going wrong, not going wrong", performing quality control on the horizon interpretation in the fault block in step 3) in a "serial-to-serial" manner; the quality control process is as follows:

extracting a plurality of seismic survey lines in any direction which do not cross the fault and simultaneously fill the whole fault block as much as possible from the inside of the large fault block in the step 3) to form a random line section assembly;

according to whether the level explanation on the seismic profile of any regular survey line (including a main survey line and an interconnection survey line) in the step 3) is continuously projected on any line profile combination or not, quality control is carried out on the level explanation inside the fault block in the step 3), wherein if the projection is continuous, the level explanation inside the fault block in the step 3) meets the explanation requirement; and if the projection is discontinuous, repeating the steps 3) and 4), correcting the interpretation of the internal layer position of the fault block in the step 3) until the projection is continuous, finishing the quality control of the interpretation of the internal layer position of the fault block, and forming a mutual sufficient level relation between any line and the regular line layer position interpretation.

5) As shown in fig. 7, taking "around fault" as a strategy, each fault block is taken as an independent unit, and the fault block which completes the horizon interpretation quality control in step 4) is taken as a guide, that is, the fault block is taken as a guide fault block, the interpretation horizon in the guide fault block is radiated into the next fault block step by step through a main survey line and a contact survey line near the transition region between the fault blocks, and the process of the fault block is as follows:

firstly, extracting a crossline seismic section ① which passes through a guide fault block and is positioned near the position where the guide fault block is connected with the next fault block for horizon interpretation;

a main line seismic section ② intersecting the crossline seismic section ① and located at the border of the two fault blocks is then extracted for horizon interpretation,

finally, crosswires ③ are extracted that intersect the main line seismic section ② and pass through the next fault block for interpretation, thereby gradually radiating the horizon interpretation results from the first fault block into the second fault block.

It should be noted that in the above steps, if a main line or crossline seismic section that can be bypassed to the next fault block is not actually found, a main line or crossline seismic section should be extracted across the fault at the minimum fault distance, and horizon interpretation should be performed across the fault on this seismic section.

6) And repeating the steps 3) to 5) until the horizon interpretation inside all the large fault blocks in the work area is finished, thereby finishing the horizon interpretation work of the whole work area.

The present invention has been described with reference to the above embodiments, and the structure, arrangement, and connection of the respective members may be changed. On the basis of the technical scheme of the invention, the improvement or equivalent transformation of the individual components according to the principle of the invention is not excluded from the protection scope of the invention.