A cloud-ash composite buried hill characterization method and device

Abstract

The present invention discloses a method and apparatus for characterizing a dolomite buried hill. The method comprises: characterizing the top of the dolomite buried hill based on well acoustic wave data and three-dimensional seismic data; characterizing the bottom of the dolomite buried hill based on well data and three-dimensional seismic data; intersecting the top and bottom of the dolomite buried hill to obtain a dolomite buried hill boundary; and characterizing the dolomite buried hill boundary based on the three-dimensional seismic data and the dolomite buried hill boundary. The present invention achieves precise characterization of dolomite buried hill boundaries, providing technical support for the efficient exploration and development of dolomite buried hill oil and gas reservoirs. The method has a simple operational process and strong feasibility. Furthermore, the method utilizes well calibration and imaging logging data to improve the accuracy of dolomite buried hill boundary characterization.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas reservoir exploration and development, and in particular relates to a cloud-ash composite buried hill characterization method and device. Background Art

[0002] Lower Paleozoic dolomite buried hills are a key area of ​​oil and gas exploration in the Tarim Basin. Well Z5, located in the Tazhong 25 structural zone, has generated high-yield oil and gas flows in dolomite from the Upper Cambrian Lower Qiulitage Formation, revealing the broad exploration potential of Lower Paleozoic dolomite buried hills. The Cambrian-Ordovician dolomite buried hills are deeply buried, and due to multiple phases of overlapping tectonic movements, the occurrence of faults and strata is very complex, making it difficult to determine the structural model of the dolomite buried hills below the unconformity. Furthermore, due to the similar lithology of the Ordovician limestone and dolomite, it is difficult to distinguish between the two using 3D seismic data, making it difficult to delineate the boundaries of the dolomite buried hills. This poorly defined boundary has limited the accuracy of the description of dolomite buried hill reservoirs and hampered their efficient exploration and development.

[0003] Currently, existing technologies are used to determine the vertical interface of buried hills through element combination interpretation diagrams, but there is little research on the technology of depicting the horizontal boundary of dolomite buried hills. Summary of the Invention

[0004] In view of the above problems, the present invention discloses a cloud-ash composite buried hill characterization method, comprising the following steps:

[0005] Based on the well acoustic data and 3D seismic data, the cloud-ash composite buried hill top is depicted;

[0006] Based on the well data and 3D seismic data, the bottom of the cloud-ash composite buried hill is depicted;

[0007] Taking the intersection of the cloud-ash composite buried hill top and the cloud-ash composite buried hill bottom to obtain the cloud-ash composite buried hill boundary;

[0008] Based on the 3D seismic data and the dolomite-ash composite buried-hill boundary, the dolomite buried-hill boundary is delineated.

[0009] Furthermore, the specific steps of depicting the top of the cloud-ash composite buried hill based on the well acoustic data and 3D seismic data are as follows:

[0010] Use the acoustic data from the drilled well to create synthetic seismic records;

[0011] Performing well-seismic calibration on the synthetic seismic record and the three-dimensional seismic data to determine the seismic reflection event corresponding to the top of the cloud-ash composite buried hill;

[0012] Based on the seismic reflection phase axis, the cloud-ash composite buried hill top layer interpretation is carried out on the 3D seismic data;

[0013] According to the results of the stratigraphic interpretation of the cloud-ash composite buried-mountain top, a structural map is drawn to depict the cloud-ash composite buried-mountain top.

[0014] Furthermore, the specific steps of depicting the bottom of the cloud-ash composite buried hill based on the drilling data and 3D seismic data are as follows:

[0015] Based on the drilling data, imaging logging interpretation was carried out to obtain the bottom formation dip of the cloud-ash composite buried hill;

[0016] According to the dip angle of the bottom stratum of the cloud-ash composite buried hill, the dip angle of the seismic reflection event axis of the bottom of the cloud-ash composite buried hill is determined on the 3D seismic data;

[0017] Based on the dip angle of seismic reflection events at the bottom of the cloud-ash composite buried hill, the bottom horizon of the cloud-ash composite buried hill is interpreted on 3D seismic data.

[0018] Based on the results of the stratigraphic interpretation of the bottom surface of the cloud-ash composite buried hill, structural mapping was carried out to depict the bottom surface of the cloud-ash composite buried hill.

[0019] Furthermore, the specific steps of depicting the dolomite buried hill boundary based on the 3D seismic data and the dolomite-ash composite buried hill boundary are as follows:

[0020] Based on the 3D seismic data and the characterization results of the cloud-ash composite buried-hill top, the vertical time window is set at different lengths above and below the cloud-ash composite buried-hill top to extract the sensitive properties of the fracture-vuggy reservoir.

[0021] calibrating a first threshold value for the sensitive attribute of the fracture-vuggy reservoir according to the drilling data;

[0022] Determine the range of dolomite according to the first threshold value of the fracture-vuggy reservoir sensitive attribute, and obtain the dolomite buried hill boundary attribute characterization result;

[0023] The intersection of the boundary characterization results of the dolomite-ash composite buried hill and the boundary attribute characterization results of the dolomite buried hill is taken to obtain the boundary characterization results of the dolomite buried hill.

[0024] Furthermore, the sensitive attribute of the fracture-vuggy reservoir is a root mean square amplitude attribute.

[0025] Furthermore, the specific steps of calibrating the first threshold value of the sensitive attribute of the fracture-vuggy reservoir based on the drilling data are as follows:

[0026] According to the drilling data, when the absolute value of the drilling time difference between two adjacent points in the reservoir is greater than the second threshold, the root mean square amplitude attribute value at the point where the drilling time becomes smaller is the first threshold.

[0027] Furthermore, the second threshold is in the range of 20-30 min / m.

[0028] The present invention also discloses a cloud-ash composite buried hill characterization device, comprising:

[0029] The top surface unit is used to characterize the top surface of the cloud-ash composite buried mountain based on the well acoustic data and 3D seismic data;

[0030] A bottom surface unit is used to depict the bottom surface of the cloud-ash composite buried hill based on the drilling data and 3D seismic data;

[0031] An intersection unit is used to take the intersection of the cloud-ash composite buried hill top and the cloud-ash composite buried hill bottom to obtain a cloud-ash composite buried hill boundary;

[0032] The boundary unit is used to characterize the dolomite buried hill boundary based on three-dimensional seismic data and the dolomite-ash composite buried hill boundary.

[0033] Furthermore, the top surface unit is specifically used for:

[0034] Use the acoustic data from the drilled well to create synthetic seismic records;

[0035] Performing well-seismic calibration on the synthetic seismic record and the three-dimensional seismic data to determine the seismic reflection event corresponding to the top of the cloud-ash composite buried hill;

[0036] Based on the seismic reflection phase axis, the cloud-ash composite buried hill top layer interpretation is carried out on the 3D seismic data;

[0037] According to the results of the stratigraphic interpretation of the cloud-ash composite buried-mountain top, a structural map is drawn to depict the cloud-ash composite buried-mountain top.

[0038] Furthermore, the bottom surface unit is specifically used for:

[0039] Based on the drilling data, imaging logging interpretation was carried out to obtain the bottom formation dip of the cloud-ash composite buried hill;

[0040] According to the dip angle of the bottom stratum of the cloud-ash composite buried hill, the dip angle of the seismic reflection event axis of the bottom of the cloud-ash composite buried hill is determined on the 3D seismic data;

[0041] Based on the dip angle of seismic reflection events at the bottom of the cloud-ash composite buried hill, the bottom horizon of the cloud-ash composite buried hill is interpreted on 3D seismic data.

[0042] Based on the results of the stratigraphic interpretation of the bottom surface of the cloud-ash composite buried hill, structural mapping was carried out to depict the bottom surface of the cloud-ash composite buried hill.

[0043] Compared with the prior art, the embodiments of the present invention have at least the following advantages:

[0044] 1. Achieved fine delineation of dolomite buried-hill boundaries, providing technical support for efficient exploration and development of dolomite buried-hill oil and gas reservoirs;

[0045] 2. The operation process is simple and highly feasible. At the same time, the precision of dolomite buried hill boundary delineation is improved by utilizing the fine calibration and imaging logging data of the drilled wells.

[0046] 3. It has good application effect and driving value to the same industry.

[0047] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 A flow chart of a cloud-ash composite buried hill characterization method according to an embodiment of the present invention is shown;

[0050] Figure 2 It shows the typical seismic profile characteristics of dolomite and limestone dissolution differences according to an embodiment of the present invention;

[0051] Figure 3 The seismic profile interpretation of the top and bottom of the cloud-ash composite buried hill according to an embodiment of the present invention is shown;

[0052] Figure 4 A histogram of the bottom surface stratum dip angle of a cloud-ash composite buried hill according to an embodiment of the present invention is shown;

[0053] Figure 5 The figure shows the result of delineating the boundary of dolomite buried hill according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0055] Figure 1 FIG. 1 shows a flow chart of a cloud-ash composite buried hill characterization method according to an embodiment of the present invention. Figure 1 As shown, the present invention proposes a cloud-ash composite buried hill characterization method, comprising the following steps:

[0056] Step 1: Describe the cloud-ash composite buried-mountain top based on the well acoustic data and 3D seismic data;

[0057] 1.1. Use the acoustic wave data from the drilled well to produce synthetic seismic records.

[0058] 1.2. Perform borehole-seismic calibration on the synthetic seismic records obtained in step 1.1 and the 3D seismic data to determine the seismic reflection events corresponding to the top of the cloud-ash composite buried hill.

[0059] 1.3. Based on the seismic reflection events corresponding to the cloud-ash composite buried-hill top determined in step 1.2, perform interpretation of the cloud-ash composite buried-hill top horizon on the 3D seismic data. For example, the interpretation accuracy is 1 line interval for both the horizontal and vertical survey lines, i.e., 1×1 interpretation density.

[0060] 1.4. Based on the interpretation results of the cloud-ash composite buried-mountain top layer obtained in step 1.3, structural mapping is performed to depict the cloud-ash composite buried-mountain top layer.

[0061] Among them, the dolomite-limestone composite buried hill is a composite buried hill of dolomite and limestone, which contains both dolomite and limestone, and is referred to as the dolomite-limestone composite buried hill.

[0062] Although the above description is given by taking the interpretation accuracy of 1 line for both horizontal and vertical survey lines, i.e., 1×1 interpretation density, as an example, the present invention is not limited thereto. A variety of interpretation densities, such as 2×2, 1×2, 3×3, etc., may be used as long as the principle of the present invention can be implemented.

[0063] Step 2: Describe the bottom surface of the cloud-ash composite buried hill based on the drilling data and 3D seismic data;

[0064] 2.1. Based on the drilling data, imaging logging interpretation is carried out to obtain the bottom formation dip of the cloud-ash composite buried hill.

[0065] 2.2. Based on the formation dip angle of the cloud-ash composite buried-hill bottom obtained in step 2.1, determine the seismic reflection event dip angle of the cloud-ash composite buried-hill bottom using 3D seismic data. However, due to poor 3D seismic imaging of the buried-hill interior, the seismic events at the cloud-ash composite buried-hill bottom are difficult to track. Furthermore, intense tectonic movement has resulted in a complex structure of the buried-hill, necessitating the use of imaging logging data from existing wells to determine the formation dip angle of the cloud-ash composite buried-hill bottom. Given the common macrotectonic setting, the formation dip angle at that well can be extrapolated as the formation dip angle of the cloud-ash composite buried-hill bottom, which is then calculated as the seismic reflection event dip angle of the cloud-ash composite buried-hill bottom on 3D seismic data.

[0066] 2.3. Based on the dip angle of the seismic reflection event obtained in step 2.2, interpret the bottom horizon of the cloud-ash composite buried-hill on the 3D seismic data. For example, the interpretation accuracy is 1 line interval for both the horizontal and vertical survey lines, i.e., a 1×1 interpretation density. Based on the dip angle of the seismic reflection event obtained above and the identifiable seismic events at the bottom of the cloud-ash composite buried-hill, interpret the bottom horizon of the cloud-ash composite buried-hill on the 3D seismic data. Interpretation of the bottom horizon of the cloud-ash composite buried-hill begins with the identifiable seismic events. Where the seismic events are unclear and interpretation is impossible, extrapolate from that point using the aforementioned stratigraphic dip angle to determine the bottom horizon of the cloud-ash composite buried-hill.

[0067] 2.4. Based on the interpretation results of the bottom surface of the cloud-ash composite buried hill obtained in step 2.3, structural mapping is performed to depict the bottom surface of the cloud-ash composite buried hill.

[0068] Step 3: Delineate the boundary of the cloud-ash composite buried hill;

[0069] 3.1. Take the intersection of the cloud-ash composite buried hill top characterization result obtained in step 1.4 and the cloud-ash composite buried hill bottom characterization result obtained in step 2.4 to obtain the cloud-ash composite buried hill boundary characterization result.

[0070] Step 4: Delineating the dolomite buried hill boundary based on the 3D seismic data and the dolomite-ash composite buried hill boundary;

[0071] Under the same geological conditions, since the degree of dissolution of limestone is greater than that of dolomite, dissolution fracture-cavity reservoirs will appear in the limestone strata. These dissolution fracture-cavity reservoirs show strong amplitude reflection characteristics on the seismic profile, while dolomite has stronger dissolution resistance than limestone and shows weak amplitude reflection characteristics on the seismic profile (such as Figure 2 Therefore, the sensitive root mean square amplitude attribute of the fracture-vuggy reservoir can be used to characterize the limestone formation, thereby distinguishing dolomite from limestone.

[0072] 4.1. Using the 3D seismic data and the cloud-ash composite buried-mountain top characterization results obtained in step 1.4, a vertical time window of 100 meters above and below the cloud-ash composite buried-mountain top is used to extract the root mean square amplitude attributes of the fracture-vuggy reservoir sensitive attributes.

[0073] 4.2. Use existing drilling data to calibrate the first threshold value of the fracture-vuggy reservoir sensitivity attribute obtained in step 4.1. According to drilling data, drilling time accelerates when a well reaches a fracture-vuggy reservoir. Therefore, when the absolute difference in drilling time between two adjacent points in the reservoir is greater than the second threshold value, the well is considered to have reached the fracture-vuggy reservoir. The root mean square amplitude value of the fracture-vuggy reservoir sensitivity attribute at the point where the drilling time decreases is the first threshold value of the fracture-vuggy reservoir sensitivity attribute. The second threshold value ranges from 20 to 30 min / m; preferably, the second threshold value is 20 min / m.

[0074] 4.3. According to the first threshold value of the fracture-vuggy reservoir sensitivity determined in step 4.2, the portion less than or equal to the first threshold value is dolomite, and the dolomite buried-hill boundary attribute characterization result is obtained.

[0075] 4.4. The intersection of the cloud-ash composite buried hill boundary characterization result obtained in step 3.1 and the dolomite buried hill boundary attribute characterization result obtained in step 4.3 is obtained to obtain the dolomite buried hill boundary characterization result.

[0076] Example: The above technology has been successfully applied to a cloud-ash composite buried hill characterization project in the Tazhong area of ​​Tarim Oilfield. According to step 1 and step 2, the top and bottom of the cloud-ash composite buried hill were interpreted as follows: Figure 3 As shown, among them, Figure 4 As shown in Figure 1, the formation dip histogram is made based on the formation dip data obtained from the imaging logging results at the well point. From the histogram, it can be seen that the frequency of 40-50° is the largest, and the average value of 45° is taken as the formation dip. According to steps 3 and 4, the detailed characterization of the dolomite buried hill is achieved. Figure 5 The final dolomite buried-hill area was determined to be 58.3 square kilometers, with reported trapped resources of 1.97 million tons of oil and 12.6 billion cubic meters of gas. Two exploratory wells (Z58 and Z582) were successfully drilled in the dolomite buried-hill outcrop area, both successfully intersecting high-quality dolomite and generating industrial oil and gas flows. To date, cumulative oil production has reached 19,700 tons and gas production has reached 131 million cubic meters.

[0077] The present invention uses high-precision three-dimensional seismic data and drilled well data, with the help of imaging logging data, to characterize the plane boundary of the dolomite-limestone composite buried hill. On this basis, it further combines the differences in lithologic dissolution of dolomite and limestone, and relies on the sensitive properties of fracture-vuggy reservoirs to determine the plane boundary of the dolomite buried hill, thereby improving the accuracy of dolomite buried hill boundary characterization and providing technical support for the efficient exploration and development of dolomite buried hill oil and gas reservoirs.

[0078] The cloud-ash composite buried-hill characterization method of the present invention realizes the fine characterization of the dolomite buried-hill boundary, providing technical support for the efficient exploration and development of dolomite buried-hill oil and gas reservoirs; the operation process is simple and the feasibility is strong; at the same time, the precision of dolomite buried-hill boundary characterization is improved by utilizing the fine calibration and imaging logging data of the drilled wells; and it has a good application effect and promotion value to the same industry.

[0079] Based on the above-mentioned cloud-ash composite buried-hill characterization method, the present invention further proposes a cloud-ash composite buried-hill characterization device, comprising:

[0080] The top surface unit is used to characterize the top surface of the cloud-ash composite buried mountain based on the well acoustic data and 3D seismic data;

[0081] A bottom surface unit is used to depict the bottom surface of the cloud-ash composite buried hill based on the drilling data and 3D seismic data;

[0082] An intersection unit is used to take the intersection of the cloud-ash composite buried hill top and the cloud-ash composite buried hill bottom to obtain a cloud-ash composite buried hill boundary;

[0083] The boundary unit is used to characterize the dolomite buried hill boundary based on three-dimensional seismic data and the dolomite-ash composite buried hill boundary.

[0084] In some embodiments, the top surface unit is specifically used to:

[0085] Use the acoustic data from the drilled well to create synthetic seismic records;

[0086] Performing well-seismic calibration on the synthetic seismic record and the three-dimensional seismic data to determine the seismic reflection event corresponding to the top of the cloud-ash composite buried hill;

[0087] Based on the seismic reflection phase axis, the cloud-ash composite buried hill top layer interpretation is carried out on the 3D seismic data;

[0088] According to the results of the stratigraphic interpretation of the cloud-ash composite buried-mountain top, a structural map is drawn to depict the cloud-ash composite buried-mountain top.

[0089] In some embodiments, the bottom surface unit is specifically used to:

[0090] Based on the drilling data, imaging logging interpretation was carried out to obtain the bottom formation dip of the cloud-ash composite buried hill;

[0091] According to the dip angle of the bottom stratum of the cloud-ash composite buried hill, the dip angle of the seismic reflection event axis of the bottom of the cloud-ash composite buried hill is determined on the 3D seismic data;

[0092] Based on the dip angle of seismic reflection events at the bottom of the cloud-ash composite buried hill, the bottom horizon of the cloud-ash composite buried hill is interpreted on 3D seismic data.

[0093] Based on the results of the stratigraphic interpretation of the bottom surface of the cloud-ash composite buried hill, structural mapping was carried out to depict the bottom surface of the cloud-ash composite buried hill.

[0094] It should be understood that “one embodiment” or “an embodiment” mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present disclosure. Therefore, “in one embodiment” or “in an embodiment” appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present disclosure, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present disclosure. The serial numbers of the embodiments of the present disclosure are for description only and do not represent the advantages and disadvantages of the embodiments.

[0095] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cloud-ash composite buried hill characterization method, characterized in that: The following steps are involved: Based on the well acoustic data and 3D seismic data, the cloud-ash composite buried hill top is depicted; Based on the well data and 3D seismic data, the bottom of the cloud-ash composite buried hill is depicted; Taking the intersection of the cloud-ash composite buried hill top and the cloud-ash composite buried hill bottom to obtain the cloud-ash composite buried hill boundary; Based on 3D seismic data and the dolomite-ash composite buried-hill boundary, the dolomite buried-hill boundary is delineated; The specific steps of depicting the dolomite buried hill boundary based on the 3D seismic data and the dolomite-ash composite buried hill boundary are as follows: Based on the 3D seismic data and the characterization results of the cloud-ash composite buried-hill top, the vertical time window is set at different lengths above and below the cloud-ash composite buried-hill top to extract the sensitive properties of the fracture-vuggy reservoir. calibrating a first threshold value for the sensitive attribute of the fracture-vuggy reservoir according to the drilling data; Determine the range of dolomite according to the first threshold value of the fracture-vuggy reservoir sensitive attribute, and obtain the dolomite buried hill boundary attribute characterization result; The intersection of the boundary characterization results of the dolomite-ash composite buried hill and the boundary attribute characterization results of the dolomite buried hill is obtained; The sensitive attribute of the fracture-vuggy reservoir is the root mean square amplitude attribute; The specific steps of calibrating the first threshold value of the sensitive attribute of the fracture-vuggy reservoir based on the drilling data are as follows: According to the drilling data, when the absolute value of the drilling time difference between two adjacent points in the reservoir is greater than the second threshold, the root mean square amplitude attribute value at the point where the drilling time becomes smaller is the first threshold; The dolomite-limestone composite buried hill is a composite buried hill of dolomite and limestone.

2. The cloud-ash composite buried hill characterization method according to claim 1, characterized in that: The specific steps of depicting the top of the cloud-ash composite buried hill based on the well acoustic data and 3D seismic data are as follows: Use the acoustic data from the drilled well to create synthetic seismic records; Performing well-seismic calibration on the synthetic seismic record and the three-dimensional seismic data to determine the seismic reflection event corresponding to the top of the cloud-ash composite buried hill; Based on the seismic reflection phase axis, the cloud-ash composite buried hill top layer interpretation is carried out on the 3D seismic data; According to the results of the stratigraphic interpretation of the cloud-ash composite buried-mountain top, a structural map is drawn to depict the cloud-ash composite buried-mountain top.

3. The cloud-ash composite buried hill characterization method according to claim 1, characterized in that: The specific steps of depicting the bottom of the cloud-ash composite buried hill based on the drilling data and 3D seismic data are as follows: Based on the drilling data, imaging logging interpretation was carried out to obtain the bottom formation dip of the cloud-ash composite buried hill; According to the dip angle of the bottom stratum of the cloud-ash composite buried hill, the dip angle of the seismic reflection event axis of the bottom of the cloud-ash composite buried hill is determined on the 3D seismic data; Based on the dip angle of seismic reflection events at the bottom of the cloud-ash composite buried hill, the bottom horizon of the cloud-ash composite buried hill is interpreted on 3D seismic data. Based on the results of the stratigraphic interpretation of the bottom surface of the cloud-ash composite buried hill, structural mapping was carried out to depict the bottom surface of the cloud-ash composite buried hill.

4. The cloud-ash composite buried hill characterization method according to claim 1, characterized in that: The second threshold value ranges from 20 to 30 min / m.

5. A cloud-ash composite buried hill carving device, characterized in that: include: The top surface unit is used to characterize the top surface of the cloud-ash composite buried mountain based on the well acoustic data and 3D seismic data; A bottom surface unit is used to depict the bottom surface of the cloud-ash composite buried hill based on the drilling data and 3D seismic data; An intersection unit is used to take the intersection of the cloud-ash composite buried hill top and the cloud-ash composite buried hill bottom to obtain a cloud-ash composite buried hill boundary; Boundary units are used to characterize the dolomite buried hill boundary based on three-dimensional seismic data and the dolomite-ash composite buried hill boundary; The specific steps of depicting the dolomite buried hill boundary based on the 3D seismic data and the dolomite-ash composite buried hill boundary are as follows: Based on the 3D seismic data and the characterization results of the cloud-ash composite buried-hill top, the vertical time window is set at different lengths above and below the cloud-ash composite buried-hill top to extract the sensitive properties of the fracture-vuggy reservoir. calibrating a first threshold value for the sensitive attribute of the fracture-vuggy reservoir according to the drilling data; Determine the range of dolomite according to the first threshold value of the fracture-vuggy reservoir sensitive attribute, and obtain the dolomite buried hill boundary attribute characterization result; The intersection of the boundary characterization results of the dolomite-ash composite buried hill and the boundary attribute characterization results of the dolomite buried hill is obtained; The sensitive attribute of the fracture-vuggy reservoir is the root mean square amplitude attribute; The specific steps of calibrating the first threshold value of the sensitive attribute of the fracture-vuggy reservoir based on the drilling data are as follows: According to the drilling data, when the absolute value of the drilling time difference between two adjacent points in the reservoir is greater than the second threshold, the root mean square amplitude attribute value at the point where the drilling time becomes smaller is the first threshold; The dolomite-limestone composite buried hill is a composite buried hill of dolomite and limestone.

6. The cloud-ash composite buried hill carving device according to claim 5, characterized in that: The top surface unit is specifically used for: Use the acoustic data from the drilled well to create synthetic seismic records; Performing well-seismic calibration on the synthetic seismic record and the three-dimensional seismic data to determine the seismic reflection event corresponding to the top of the cloud-ash composite buried hill; Based on the seismic reflection phase axis, the cloud-ash composite buried hill top layer interpretation is carried out on the 3D seismic data; According to the results of the stratigraphic interpretation of the cloud-ash composite buried-mountain top, a structural map is drawn to depict the cloud-ash composite buried-mountain top.

7. The cloud-ash composite buried hill carving device according to claim 5, characterized in that: The bottom surface unit is specifically used for: Based on the drilling data, imaging logging interpretation was carried out to obtain the bottom formation dip of the cloud-ash composite buried hill; According to the dip angle of the bottom stratum of the cloud-ash composite buried hill, the dip angle of the seismic reflection event axis of the bottom of the cloud-ash composite buried hill is determined on the 3D seismic data; Based on the dip angle of seismic reflection events at the bottom of the cloud-ash composite buried hill, the bottom horizon of the cloud-ash composite buried hill is interpreted on 3D seismic data. Based on the results of the stratigraphic interpretation of the bottom surface of the cloud-ash composite buried hill, structural mapping was carried out to depict the bottom surface of the cloud-ash composite buried hill.

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