Method and system for engraving oil and gas reservoir cave reservoir body

Abstract

The method comprises the steps that production parameters of different single wells in a to-be-studied area and the seismic sensitive attribute value of an emptying leakage section in each single well are obtained, and the carving threshold value of the cave reservoir body in each emptying leakage section is determined according to the seismic sensitive attribute values; according to the production parameters, obtaining a first parameter of each single well representing the change characteristic of the seismic attribute sensitive value along with the preset carving volume of the cave reservoir body, and according to the distribution condition of the first parameter in the to-be-researched area, obtaining first parameters of other point locations in the to-be-researched area; and based on the change characteristics of the seismic sensitive attribute values along with the production parameters, combining the first parameter of each point location in the to-be-researched area to obtain an engraving threshold value of each point location so as to form a cave reservoir body engraving result of the to-be-researched area. According to the multi-well fracture-vug type carbonate rock oil and gas reservoir cavern engraving method, accurate engraving of the multi-well fracture-vug type carbonate rock oil and gas reservoir

Description

Technical Field

[0001] The present invention belongs to the field of exploration of fracture-cavity type salt rock oil and gas reservoirs, and particularly relates to a method and a system for carving a cave reservoir body of an oil and gas reservoir. Background Art

[0002] Fracture-cavity type carbonate rock oil and gas reservoirs are formed by multi-stage tectonic movements, karstification, and weathering and erosion. The reservoir space mainly consists of caves, pores, and fractures. Carving of fracture-cavity bodies is the basis for work such as reserve calculation and geological modeling of fracture-cavity type carbonate rock oil and gas reservoirs. At present, the methods for carving fracture-cavity bodies include: a seismic fracture-cavity body carving method combining seismic attribute bodies and seismic inversion bodies, and a seismic fracture-cavity body carving method of geological modeling. Among them, the determination of the carving threshold value is a key link in carving the three-dimensional geometric shape of fracture-cavity bodies based on sensitive seismic attributes.

[0003] Cave-like reservoir spaces are the most important type of reservoir space in fracture-cavity type carbonate rock oil and gas reservoirs, and are also a type of reservoir body with the clearest identification of seismic attributes, actual drilling data, and dynamic characteristics. The carving of cave reservoir bodies is particularly crucial for reserve estimation, well location deployment, and formulation of stimulation measures. In the carving process targeting cave reservoir bodies, the key point reflecting carving accuracy also lies in the determination of the carving threshold value. In actual work, the average method is mainly used to determine the carving threshold value. Taking the carving of cave reservoir bodies based on seismic wave impedance attributes as an example, the average method used needs to first determine the single-well carving threshold value of wells with blowout and lost circulation data in the study area, and then calculate the arithmetic mean of the single-well carving threshold values of multiple wells in the study area, and use this average value as the carving threshold value of cave reservoir bodies in the study area. However, this method has deficiencies. On the one hand, there are errors between the three-dimensional geometric shape and the blowout and lost circulation positions of the cave reservoir bodies carved using the arithmetic mean of the wave impedance values of all blowout and lost circulation sections in the study area as the single-well carving threshold value and the actual situation. On the other hand, due to the influence of many factors such as genesis and filling degree on cave reservoir bodies, there are differences in the carving threshold values of wells at each point in the same study area. Using the average value of the carving threshold values of multiple wells as the carving threshold value of the study area is equivalent to assuming that the factors affecting caves are homogeneous in space, which not only does not conform to geological reality but also causes deviations in wells with actual drilling data, ultimately resulting in the carving result of cave reservoir bodies not conforming to the actual situation. Summary of the Invention

[0004] To solve the above problems, an embodiment of the present invention provides a method for carving a cave reservoir body in an oil and gas reservoir, including: obtaining production parameters of different single wells in the area to be studied, as well as seismic sensitive attribute values of the emptying and leakage sections in each single well, and determining the carving threshold value of the cave reservoir body in each emptying and leakage section according to the seismic sensitive attribute values; obtaining, according to the production parameters, a first parameter of each single well representing the variation characteristics of the seismic attribute sensitive value with the preset carving volume of the cave reservoir body, and obtaining the first parameters of the remaining points in the area to be studied according to their distribution in the area to be studied; based on the variation characteristics of the seismic sensitive attribute values with the production parameters, combining the first parameters of each point in the area to be studied, obtaining the carving threshold value of each point to form the carving result of the cave reservoir body in the area to be studied.

[0005] Preferably, in the step of obtaining the seismic sensitive attribute values of the emptying and leakage sections in each single well in the area to be studied, it includes: performing well-seismic calibration on the emptying and leakage sections by using the seismic data volume and drilling data of the area to be studied, so as to obtain the seismic sensitive attribute values.

[0006] Preferably, in the step of determining the carving threshold value of the cave reservoir body in each emptying and leakage section according to the seismic sensitive attribute values, it includes: respectively using the seismic sensitive attribute and the distance between different vertical positions in the emptying and leakage section and its top as the abscissa and ordinate, so as to construct a curve representing the variation of the seismic attribute sensitive value with the well depth for each single well; extracting the curve segments on the curve that meet the preset curve variation amplitude, and taking the data of the seismic sensitive attribute values located in the curve segments as the seismic sensitive attribute values of the cave reservoir body to obtain the carving threshold value.

[0007] Preferably, in the process of obtaining the carving threshold value, it includes: calculating the arithmetic mean value of the seismic sensitive attribute values of the cave reservoir body, and taking the calculation result as the carving threshold value.

[0008] Preferably, the variation characteristics of the seismic attribute sensitive value with the preset carving volume of the cave reservoir body include a direct variation characteristic and an inverse variation characteristic. Among them, in the step of obtaining, according to the production parameters, a first parameter of each single well representing the variation characteristics of the seismic attribute sensitive value with the preset carving volume of the cave reservoir body, it includes:

[0009] Calculating the first parameter corresponding to the direct variation characteristic by using the following expression:

[0010] Z = P i

[0011] Or, calculating the first parameter corresponding to the inverse variation characteristic by using the following expression:

[0012]

[0013] Among them, Z represents the first parameter, and P i represents the production parameter of the i-th single well.

[0014] Preferably, the method further includes: respectively obtaining the first parameter of the remaining points in the area to be studied by using planar interpolation method, and the carving threshold value of the corresponding points.

[0015] Preferably, in the step of forming the carving result of the cave reservoir body in the area to be studied, it includes: based on the carving threshold value of each point, using the wave impedance inversion data volume of the area to be studied to carve the three-dimensional geometric shape of the seismic facies of the cave reservoir body in the current area to be studied, so as to obtain the carving result of the oil and gas reservoir cave reservoir body.

[0016] Preferably, the seismic sensitive attribute value is a characteristic parameter of the seismic attribute with the ability to characterize the cave reservoir body, including but not limited to: wave impedance value, structural gradient tensor, coherent energy gradient, energy envelope; the production parameter is a dynamic parameter with the ability to reflect the production characteristics of the oil well, including but not limited to: cumulative oil production, average daily liquid production, cumulative liquid production, initial liquid production.

[0017] The present invention also provides a computer-readable storage medium, which contains a series of instructions for executing the method steps of carving the oil and gas reservoir cave reservoir body.

[0018] On the other hand, the present invention also provides a system for carving the oil and gas reservoir cave reservoir body. The system includes the following modules: a basic parameter acquisition module, which is used to acquire the production parameters of different single wells in the area to be studied, and the seismic sensitive attribute values of the emptying and leakage sections in each single well, and determine the carving threshold value of the cave reservoir body in each emptying and leakage section according to the seismic sensitive attribute values; an intermediate parameter acquisition module, which is used to obtain the first parameter representing the change characteristics of the seismic attribute sensitive value with the preset carving volume of the cave reservoir body of each single well according to the production parameters, and obtain the first parameter of the remaining points in the area to be studied according to its distribution in the area to be studied; a carving result generation module, which is used to obtain the carving threshold value of each point based on the change characteristics of the seismic sensitive attribute value with the production parameter, and combine the first parameter of each point in the area to be studied to form the carving result of the cave reservoir body in the area to be studied.

[0019] Compared with the prior art, one or more of the above embodiments may have the following advantages or beneficial effects:

[0020] The present invention provides a method and system for carving cave reservoirs in oil and gas reservoirs. The method first determines the carving threshold value of a single-well cave reservoir based on the combination of well logging and seismic data, and then obtains the carving threshold values of each point in the entire area to be studied with production dynamic indicators as constraints, thereby forming the carving result of the cave reservoir in the area to be studied. The present invention solves the problem that the carving volume of the cave reservoir is inaccurate due to the too large wave impedance at the top and bottom of the single-well cave reservoir, takes into account the heterogeneity of the cave reservoir in the plane, overcomes the defect that the carving result of the cave reservoir does not conform to the actual situation when the same carving threshold value is used for carving in the entire area to be studied, and realizes the accurate carving of the cave reservoirs in multi-well fracture-vuggy carbonate oil and gas reservoirs.

[0021] Other features and advantages of the present invention will be described in the following specification, and in part will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the specification, claims and drawings. Brief Description of the Drawings

[0022] The drawings are used to provide further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0023] Figure 1 It is a step diagram of the method for carving cave reservoirs in oil and gas reservoirs according to an embodiment of the present application.

[0024] Figure 2 It is an example diagram of the curve constructed by the method for carving cave reservoirs in oil and gas reservoirs according to an embodiment of the present application.

[0025] Figure 3 It is an example diagram of the planar distribution of all first parameters in the area to be studied by the method for carving cave reservoirs in oil and gas reservoirs according to an embodiment of the present application.

[0026] Figure 4 It is an example diagram of the planar distribution of all carving threshold values in the area to be studied by the method for carving cave reservoirs in oil and gas reservoirs according to an embodiment of the present application.

[0027] Figure 5 It is an example diagram of the carving result of the method for carving cave reservoirs in oil and gas reservoirs according to an embodiment of the present application.

[0028] Figure 6 It is a module block diagram of the system for carving cave reservoirs in oil and gas reservoirs according to an embodiment of the present application. Detailed Embodiments

[0029] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, so as to fully understand how the present invention uses technical means to solve technical problems and achieve the implementation process of technical effects and implement accordingly. It should be noted that as long as there is no conflict, the various embodiments in the present invention and the various features in each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0030] In addition, the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0031] In actual work, there are deficiencies in determining the carving threshold value by the average method. On the one hand, there are errors between the three-dimensional geometric shape and the emptying and leakage positions of the cave reservoir body carved with the arithmetic mean value of the wave impedance values of all the emptied and lost sections in the study area as the single-well carving threshold value and the actual situation. On the other hand, due to the influence of many factors such as the origin and filling degree of the cave reservoir body, there are differences between the carving threshold values of the wells at each point in the same study area. Taking the average value of the carving threshold values of multiple wells as the carving threshold value of the study area is equivalent to assuming that the factors affecting the cave are homogeneous in space, which not only does not conform to the geological reality but also causes deviations in the wells with actual drilling data, and finally makes the carving result of the cave reservoir body inconsistent with the actual situation.

[0032] Therefore, to solve the above problems, the embodiments of the present invention propose a method and system for carving the cave reservoir body of an oil and gas reservoir. The method first determines the carving threshold value of the single-well cave reservoir body based on the combination of well and seismic data, and then obtains the carving threshold values of each point in the entire area to be studied with production dynamic indicators as constraints, and then forms the carving result of the cave reservoir body in the area to be studied. The present invention solves the problem that the carving volume of the cave reservoir body is inaccurate due to too large wave impedance values at the top and bottom of the single-well cave reservoir body, considers the heterogeneity of the cave reservoir body on the plane, overcomes the defect that the carving result of the cave reservoir body is inconsistent with the actual situation when the same carving threshold value is used for carving in the entire area to be studied, and realizes the accurate carving of the cave reservoir body of the multi-well fracture-cavity carbonate rock oil and gas reservoir.

[0033] Example 1

[0034] Figure 1 is the step diagram of the method for carving the cave reservoir body of the oil and gas reservoir in the embodiment of the present application. The following will refer to Figure 1 to illustrate each step of this method.

[0035] As Figure 1As shown, in step S110, production parameters of different individual wells within the area to be studied are obtained, as well as seismic sensitive attribute values of the blowout and leakage sections in each individual well. Based on the seismic sensitive attribute values, the carving threshold values of the cave reservoirs within each blowout and leakage section are determined. In the present invention, by combining dynamic and static data, a cave carving body that is more in line with geological reality is established. Therefore, in the embodiments of the present application, production parameters of different individual wells within the area to be studied are collected as dynamic data, and at the same time, seismic sensitive attribute values of the blowout and leakage sections in each individual well are collected as static data, thereby obtaining dynamic and static data. After obtaining the dynamic and static data, the carving threshold values of the cave reservoirs within each blowout and leakage section are obtained according to the distribution of the seismic sensitive attribute values in the blowout and leakage sections. In the embodiments of the present application, the seismic sensitive attribute is a seismic attribute that has a specific correlation with the blowout and leakage state of the well section.

[0036] In a specific embodiment of the present application, the seismic sensitive attribute value is a characteristic parameter of a seismic attribute with the ability to characterize a cave reservoir, including but not limited to: wave impedance value, structural gradient tensor, coherent energy gradient, energy envelope; the production parameter is a dynamic parameter with the ability to reflect the production characteristics of an oil well, including but not limited to: cumulative oil production, average daily liquid production, cumulative liquid production, initial liquid production.

[0037] In the step of obtaining the seismic sensitive attribute values of the blowout and leakage sections in each individual well within the area to be studied, well-seismic calibration is performed on the blowout and leakage sections using the seismic data volume and drilling data of the area to be studied, thereby obtaining the seismic sensitive attribute values. Specifically, in this embodiment, the seismic data volume and drilling data of the area to be studied are first collected for well-seismic calibration of the blowout and leakage sections in each individual well. Then, the seismic sensitive attribute values of each blowout and leakage section are recorded with a certain vertical accuracy. In a specific embodiment of the present application, taking the wave impedance value as the seismic sensitive attribute value, the recorded wave impedance value is used as the seismic sensitive attribute value of the blowout and leakage sections in each individual well within the area to be studied as shown in Table 1:

[0038] Table 1 Seismic sensitive attribute values of the blowout and leakage sections in different individual wells

[0039]

[0040] In the step of determining the carving threshold value of the cave reservoir body in each blowout and leakage section according to the seismic sensitive attribute value, the seismic sensitive attribute and the distance from different vertical positions in the blowout and leakage section to its top are used as the abscissa and ordinate respectively, so as to represent the curve of the seismic attribute sensitive value changing with the well depth for each single-well structure; then, the curve segments that meet the preset curve change amplitude are extracted from the curve, and the data of the seismic sensitive attribute value located in the curve segment are used as the seismic sensitive attribute value of the cave reservoir body to obtain the carving threshold value. Specifically, in this embodiment, the seismic sensitive attribute is used as the abscissa, and at the same time, the relative depth of the well section of different vertical positions inside the blowout and leakage section relative to its top, that is, the distance from the top of the blowout and leakage section, is used as the ordinate. For each single well, the seismic attribute sensitive value and the corresponding distance from the top of the blowout and leakage section are integrated into a coordinate system. Thus, by connecting the data points of the seismic attribute sensitive value and the corresponding distance from the top of the blowout and leakage section in the coordinate system in turn, the curve showing the change of the seismic attribute sensitive value with the well depth as shown in Figure 2 is constructed ([ Figure 2 is an example diagram of the curve constructed by the method for carving the cave reservoir body of the oil and gas reservoir in the embodiment of the present application). Then, using the preset curve change amplitude representing the curve segment of the blowout and leakage section, the curve segments are extracted for each curve. Thus, the data of the seismic sensitive attribute value located in the curve segment are used as the seismic sensitive attribute value of the cave reservoir body, so as to obtain the carving threshold value by using the seismic sensitive attribute value of the current cave reservoir body.

[0041] In practical applications, the wave impedance of the cave reservoir body generally shows the characteristic of first decreasing from large to small and then increasing from small to large from the cave top to the cave bottom. Therefore, in a specific embodiment of the present application, the preset curve change amplitude is set to 1 / 2, and the wave impedance value smaller than the current preset curve change amplitude is used as the wave impedance value of the core part of the cave. Then, the wave impedance value smaller than the current preset curve change amplitude is extracted as the seismic sensitive attribute value of the cave reservoir body to obtain the carving threshold value.

[0042] In the process of obtaining the carving threshold value, the arithmetic mean value of the seismic sensitive attribute values of the cave reservoir body is calculated, and the calculation result is used as the carving threshold value. In a specific embodiment of the present application, the extracted wave impedance value smaller than the current preset curve change amplitude is used as the arithmetic mean value of the seismic sensitive attribute values of the cave reservoir body as the carving threshold value of the corresponding cave reservoir body. It can be seen that the present invention takes into account the geological reality, and based on the wave impedance value of the core part of the cave intercepted in the blowout and leakage section as the basic data for calculating the arithmetic mean value of the carving threshold value, effectively solves the problem that the carving volume of the cave reservoir body is inaccurate due to the too large wave impedance at the top and bottom of the cave reservoir body, and better reflects the development law of the cave reservoir body.

[0043] Further, in step S120, according to the production parameters, a first parameter representing the variation characteristics of the seismic attribute sensitivity value with the preset carving volume of the cave reservoir body is obtained for each single well, and based on its distribution in the area to be studied, the first parameters of the remaining points in the area to be studied are obtained. Specifically, in this embodiment, the planar distribution of the carving threshold value is determined with the production dynamic index (production parameter) as the constraint. First, determine the planar distribution of the production parameters in the area to be studied; then, analyze the variation characteristics of the seismic attribute sensitivity value with the preset carving volume of the cave reservoir body for each single well to obtain the first parameter. That is to say, at this time, the first parameter is only the parameter of some points in the area to be studied. Next, according to the distribution of the foregoing part of the first parameters in the area to be studied, analyze the variation trend between adjacent first parameters in the current part of the first parameters, and accordingly obtain the first parameters of the remaining points in the area to be studied as shown in Figure 3 This lays the foundation for determining the planar distribution of the carving threshold value based on multi-data combination and improves the matching degree between the finally obtained carving result and the production dynamic data ( Figure 3 is an example diagram of the planar distribution of all the first parameters in the area to be studied for the method for carving the cave reservoir body of the oil and gas reservoir in the embodiment of the present application).

[0044] Next, the variation characteristics representing the seismic attribute sensitivity value with the preset carving volume of the cave reservoir body include a direct proportion variation characteristic (the seismic attribute sensitivity value is directly proportional to the preset carving volume of the cave reservoir body) and an inverse proportion variation characteristic (the seismic attribute sensitivity value is inversely proportional to the preset carving volume of the cave reservoir body). Among them, in the step of obtaining, according to the production parameters, a first parameter representing the variation characteristics of the seismic attribute sensitivity value with the preset carving volume of the cave reservoir body for each single well, it includes:

[0045] Calculate the first parameter corresponding to the direct proportion variation characteristic by using the following expression:

[0046] Z = P i (1)

[0047] Or, calculate the first parameter corresponding to the inverse proportion variation characteristic by using the following expression:

[0048]

[0049] where Z represents the first parameter, and P i represents the production parameter of the i-th single well.

[0050] Furthermore, the method of the present invention also uses plane interpolation method to obtain the first parameters of the remaining points in the area to be studied, and the carving threshold values of the corresponding points. Specifically, in this embodiment, after analyzing the change trend between adjacent first parameters in the current part of the first parameters, the plane interpolation method is implemented according to this change trend to obtain the first parameters of the remaining points in the area to be studied. And, similarly, the plane interpolation method is implemented according to the change trend of the carving threshold values in the following text that are in the same position as the adjacent first parameters in the current part of the first parameters, to obtain the carving threshold values that are in the same position as the remaining points in the area to be studied.

[0051] Furthermore, in step S130, based on the change characteristics of the seismic sensitive attribute values with the production parameters, combined with the first parameter of each point in the area to be studied, the carving threshold value of each point is obtained to form the carving result of the cave reservoir body in the area to be studied. Usually, the cumulative production of the oil wells with larger and better-developed caves encountered in drilling is higher, and the wave impedance is lower; while the cumulative production of the oil wells with smaller and weaker-developed caves encountered in drilling is lower, and the wave impedance is higher. And, there is a negative correlation between the wave impedance and the cumulative production. Therefore, based on the change characteristics of the seismic sensitive attribute values with the production parameters (for example: the negative correlation between the wave impedance and the cumulative production) in this embodiment, the change trend of the carving threshold value can be obtained, and based on this, the plane interpolation process of the carving threshold value is constrained, so as to obtain Figure 4 the carving threshold value of each point as shown in Figure 4 (which is an example diagram of the plane distribution of all the carving threshold values in the area to be studied for the method of carving the cave reservoir body of the oil and gas reservoir in the embodiment of the present application). Finally, the carving result of the cave reservoir body in the area to be studied is formed according to the carving threshold value of each point.

[0052] In the step of forming the carving result of the cave reservoir body in the area to be studied, based on the carving threshold value of each point, using the wave impedance inversion data volume of the area to be studied, the three-dimensional geometric shape of the seismic facies of the cave reservoir body in the current area to be studied is carved, so as to obtain the carving result of the cave reservoir body of the oil and gas reservoir. Specifically, in this embodiment, based on the carving threshold value of each point, taking the wave impedance inversion data volume of the area to be studied as the basic data, the three-dimensional geometric shape of the seismic facies of the cave reservoir body in the current area to be studied is carved, and the carving result of the cave reservoir body of the oil and gas reservoir as shown in Figure 5 is obtained ( Figure 5 which is an example diagram of the carving result for the method of carving the cave reservoir body of the oil and gas reservoir in the embodiment of the present application).

[0053] Example 2

[0054] An embodiment of the present invention also provides a computer-readable storage medium, in which at least one instruction is stored, and the instruction is loaded and executed by a processor to implement the operation of carving a cave reservoir body in the method of the above embodiment. For example, the computer-readable storage medium may be a ROM (Read Only Memory), a RAM (Random Access Memory), a CD-ROM (Compact Disc-Read Only Memory), a magnetic tape, a floppy disk, an optical data storage device, etc.

[0055] Example 3

[0056] Based on the method for carving a cave reservoir body described in the above Embodiment 1, an embodiment of the present invention also provides a system for carving a cave reservoir body. Figure 6 It is a block diagram of modules of the system for carving a cave reservoir body according to an embodiment of the present application.

[0057] As Figure 6 shown, the system for carving a cave reservoir body in an embodiment of the present invention includes: a basic parameter acquisition module 61, an intermediate parameter acquisition module 62, and a carving result generation module 63. Specifically, the basic parameter acquisition module 61 is implemented according to the method described in the above step S110, and is configured to acquire the production parameters of different single wells in the area to be studied, as well as the seismic sensitive attribute values of the blowout and leakage sections in each single well, and determine the carving threshold value of the cave reservoir body in each blowout and leakage section according to the seismic sensitive attribute values; the intermediate parameter acquisition module 62 is implemented according to the method described in the above step S120, and is configured to obtain, according to the production parameters, a first parameter representing the change characteristic of the seismic attribute sensitive value with the preset carving volume of the cave reservoir body for each single well, and obtain the first parameters of the remaining points in the area to be studied according to its distribution in the area to be studied; the carving result generation module 63 is implemented according to the method described in the above step S130, and is configured to obtain the carving threshold value of each point based on the change characteristic of the seismic sensitive attribute value with the production parameters, and combine the first parameters of each point in the area to be studied to form the carving result of the cave reservoir body in the area to be studied.

[0058] The present invention discloses a method and a system for carving a cave reservoir body in an oil and gas reservoir. The method first determines the carving threshold value of the single-well cave reservoir body based on the combination of well logging and seismic data, and then obtains the carving threshold values of each point in the entire area to be studied with production dynamic indicators as constraints, and further forms the carving result of the cave reservoir body in the area to be studied. The present invention solves the problem that the carving volume of the cave reservoir body is inaccurate due to the too large wave impedance of the cave top and bottom of the single-well cave reservoir body, considers the heterogeneity of the cave reservoir body on the plane, overcomes the defect that the carving result of the cave reservoir body does not conform to the actual situation when the same carving threshold value is used for carving in the entire area to be studied, and realizes the accurate carving of the cave reservoir body in the multi-well fracture-cavity carbonate rock oil and gas reservoir. The present invention has important practical significance for the fine description, geological modeling and development of the fracture-cavity carbonate rock oil and gas reservoir body.

[0059] As mentioned above, the above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

[0060] Certainly, the present invention can also have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all belong to the protection scope of the claims of the present invention.

[0061] Those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented by a general-purpose computing device. They can be concentrated on a single computing device or distributed on a network composed of multiple computing devices. Optionally, they can be implemented by program codes executable by the computing device, so that they can be stored in a storage device and executed by the computing device, or they can be separately made into individual integrated circuit modules, or multiple modules or steps among them can be made into a single integrated circuit module to implement. In this way, the present invention is not limited to any specific combination of hardware and software.

[0062] Although the disclosed embodiments of the present invention are as above, the above content is only an implementation manner for facilitating the understanding of the present invention and is not used to limit the present invention. Any person skilled in the art within the technical field of the present invention can make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed by the present invention. However, the patent protection scope of the present invention still needs to be subject to the scope defined by the appended claims.

Claims

1. A method for carving a cave reservoir body in an oil and gas reservoir, characterized in that, Including: Obtaining production parameters of different single wells in the area to be studied, as well as seismic sensitive attribute values of the blowout and leakage sections in each single well, and determining the carving threshold value of the cave reservoir body in each blowout and leakage section according to the seismic sensitive attribute values; According to the production parameters, obtaining a first parameter representing the variation characteristics of the seismic attribute sensitive value with the preset carving volume of the cave reservoir body for each single well, and obtaining the first parameters of the remaining points in the area to be studied according to their distribution in the area to be studied; Based on the variation characteristics of the seismic sensitive attribute values with the production parameters, combining the first parameters of each point in the area to be studied, obtaining the carving threshold value of each point to form the carving result of the cave reservoir body in the area to be studied.

2. The method according to claim 1, wherein In the step of obtaining the seismic sensitive attribute values of the blowout and leakage sections in each single well in the area to be studied, it includes: Using the seismic data volume and drilling data of the area to be studied to perform well-seismic calibration on the blowout and leakage sections, so as to obtain the seismic sensitive attribute values.

3. The method according to claim 1 or 2, characterized in that, In the step of determining the carving threshold value of the cave reservoir body in each blowout and leakage section according to the seismic sensitive attribute values, it includes: Taking the seismic sensitive attribute and the distance between different vertical positions in the blowout and leakage section and its top as the abscissa and ordinate respectively, so as to construct a curve representing the variation of the seismic attribute sensitive value with the well depth for each single well; Extracting the curve segments on the curve that meet the preset curve variation amplitude, and taking the data of the seismic sensitive attribute values located in the curve segments as the seismic sensitive attribute values of the cave reservoir body to obtain the carving threshold value.

4. The method according to claim 3, wherein In the process of obtaining the carving threshold value, it includes: Calculating the arithmetic mean value of the seismic sensitive attribute values of the cave reservoir body, and taking the calculation result as the carving threshold value.

5. The method according to any one of claims 1 to 4, characterized in that The variation characteristics of the seismic attribute sensitive value with the preset carving volume of the cave reservoir body include a proportional variation characteristic and an inverse proportional variation characteristic. Among them, in the step of obtaining the first parameter representing the variation characteristics of the seismic attribute sensitive value with the preset carving volume of the cave reservoir body for each single well according to the production parameters, it includes: Calculating the first parameter corresponding to the proportional variation characteristic by using the following expression: Z = P i Or, calculating the first parameter corresponding to the inverse proportional variation characteristic by using the following expression: where Z represents the first parameter, and P i represents the production parameter of the i-th single well.

6. The method according to any one of claims 1 to 5, characterized in that The method further includes: Adopting a plane interpolation method to obtain the first parameters of the remaining points in the area to be studied and the carving threshold values of the corresponding points respectively.

7. The method according to any one of claims 1 to 6, characterized in that In the step of forming the carving result of the cave reservoir body in the area to be studied, it includes: Based on the carving threshold value of each point, using the wave impedance inversion data volume of the area to be studied to carve the three-dimensional geometric shape of the seismic facies of the cave reservoir body in the current area to be studied, so as to obtain the carving result of the oil and gas reservoir cave reservoir body.

8. The method according to any one of claims 1 to 7, characterized in that The seismic sensitive attribute value is a characteristic parameter of a seismic attribute having the ability to characterize a cave reservoir body, including but not limited to: wave impedance value, structural gradient tensor, coherent energy gradient, energy envelope. The production parameters are dynamic parameters that can reflect the production characteristics of oil wells, including but not limited to: cumulative oil production, average daily liquid production, cumulative liquid production, and initial liquid production.

9. A computer-readable storage medium, characterized in that, It includes a series of instructions for performing the method steps of engraving an oil and gas reservoir cavern reservoir body as described in any one of claims 1 to 8.

10. A system for engraving a cave reservoir body in an oil and gas reservoir, characterized in that, The system includes the following modules: A basic parameter acquisition module, which is used to acquire the production parameters of different individual wells in the area to be studied, as well as the seismic sensitive attribute values of the blowout and leakage sections in each individual well, and determine the engraving threshold values of the cavern reservoir bodies in each blowout and leakage section according to the seismic sensitive attribute values; An intermediate parameter acquisition module, which is used to obtain, according to the production parameters, a first parameter representing the variation characteristics of the seismic attribute sensitive value with the preset engraving volume of the cavern reservoir body for each individual well, and obtain the first parameters of the remaining points in the area to be studied according to their distribution in the area to be studied; An engraving result generation module, which is used to obtain the engraving threshold value of each point based on the variation characteristics of the seismic sensitive attribute value with the production parameters and combine the first parameters of each point in the area to be studied to form the engraving result of the cavern reservoir body in the area to be studied.

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