Method for determining fault sealing capacity of co 2 geological storage, and related apparatus

Abstract

Disclosed in the present application are a method for determining the fault sealing capacity of CO2 geological storage, and a related apparatus. The method specifically comprises: determining whether the lithology of a caprock corresponding to a reservoir consisting of CO2 satisfies preset conditions, the preset conditions comprising that the lithology is shale, and the proportion of clay minerals satisfies a preset range; when the lithology of the caprock does not satisfy the preset conditions, calculating a displacement pressure difference between the reservoir and a fault formed between the caprock and the reservoir; and when the displacement pressure difference is not greater than zero, determining a caprock thickness, a reservoir thickness and a fault displacement on the basis of a fault profile diagram; and, on the basis of a numerical value sorting relationship of the caprock thickness, the reservoir thickness and the fault displacement, determining the fault sealing capacity of CO2 geological storage, the fault sealing capacity comprising: a fault being completely sealed, a fault being partially sealed and a fault being unsealed. Therefore, the present application finally determines the fault sealing capacity of the CO2 geological storage.

Description

A method for determining fault sealing properties for CO2 geological storage and related devices Technical Field

[0001] The present application relates to the technical field of CO2 geological storage, and in particular to a method for determining the sealing properties of a fault for CO2 geological storage and related devices. Background Art

[0002] Currently, with the rapid increase in human industrial activity, large amounts of CO2 are being released into the atmosphere, leading to the continuous accumulation of the greenhouse effect. This has ultimately led to a series of natural disasters, including global warming, glacier melting, and sea level rise, seriously endangering human life and safety. Therefore, how to deal with the increasing amount of CO2 in the atmosphere has become an urgent issue. Geological storage of CO2 is considered one of the most promising technologies for controlling CO2 emissions.

[0003] If CO2 geological storage technology is to be applied in practice, the fault sealing properties of the CO2 geological storage must be determined. However, the method for determining fault sealing properties for CO2 geological storage differs from conventional methods, so a set of fault sealing properties determination methods suitable for CO2 geological storage needs to be established. Summary of the Invention

[0004] In view of the above problems, this application provides a method for determining the fault sealing property of CO2 geological storage, so as to realize the method for determining the fault sealing property of CO2 geological storage. The specific scheme is as follows:

[0005] A method for determining fault sealing for CO2 geological storage, comprising:

[0006] Determine whether the lithology of the cap rock corresponding to the CO2 reservoir meets the preset conditions, which include that the lithology is shale and the clay mineral ratio meets the preset range;

[0007] When the lithology of the cap rock does not meet the preset conditions, the difference between the displacement pressure of the fault formed between the cap rock and the reservoir and the reservoir is calculated;

[0008] When the difference in displacement pressure is not greater than zero, the cap rock thickness, reservoir thickness and fault throw are determined based on the fault profile. The fault sealing property of CO2 geological storage is determined based on the numerical ranking relationship of the cap rock thickness, reservoir thickness and fault throw. The fault sealing property includes: complete fault sealing, partial fault sealing and no fault sealing.

[0009] Optionally, the clay mineral ratio meeting a preset range includes:

[0010] The proportion of clay minerals falls within the range of 65% to 85%.

[0011] Optionally, it also includes:

[0012] When the lithology of the caprock meets the preset conditions, the fault is determined to be completely closed.

[0013] Optionally, it also includes:

[0014] In the case where the difference in displacement pressures is greater than zero, the fault is determined to be completely sealed.

[0015] Optionally, calculating the difference between the displacement pressure of the fault formed between the cap rock and the reservoir and the reservoir includes:

[0016] The displacement pressure difference is obtained by subtracting the displacement pressure of the reservoir from the displacement pressure of the fault formed between the cap rock and the reservoir.

[0017] Optionally, determining the fault sealing property of CO2 geological storage based on the numerical ranking relationship among cap rock thickness, reservoir thickness, and fault throw includes:

[0018] When the cap rock thickness is greater than the fault throw and greater than the reservoir thickness, the fault sealing property of CO2 geological storage is complete fault sealing;

[0019] When the caprock thickness is greater than the fault spacing, the fault sealing property of CO2 geological storage is partial closure of the fault;

[0020] When the distance between faults is greater than the thickness of the cap rock, the fault sealing property of CO2 geological storage is no fault sealing.

[0021] Optionally, determining the cap rock thickness, reservoir thickness, and fault throw based on the fault profile includes:

[0022] The cap rock thickness and reservoir thickness can be directly determined based on the fault profile, and the fault throw can be determined based on the distance between the contact surfaces of the cap rock and reservoir in the fault profile.

[0023] A device for determining the sealing property of a fault for CO2 geological storage, comprising:

[0024] A judgment unit is used to determine whether the lithology of the cap rock corresponding to the reservoir composed of CO2 meets preset conditions, wherein the preset conditions include that the lithology is shale and the proportion of clay minerals meets a preset range;

[0025] a calculation unit for calculating the difference in displacement pressure between the fault formed between the cap rock and the reservoir and the reservoir when the lithology of the cap rock does not meet a preset condition;

[0026] The determination unit is used to determine the cap rock thickness, reservoir thickness and fault throw based on the fault profile when the difference in displacement pressure is not greater than zero, and to determine the fault sealing property of CO2 geological storage based on the numerical ranking relationship of the cap rock thickness, reservoir thickness and fault throw. The fault sealing property includes: complete fault sealing, partial fault sealing and no fault sealing.

[0027] An electronic device comprising at least one processor and a memory connected to the processor, wherein:

[0028] Memory is used to store computer programs;

[0029] The processor is used to execute the computer program so that the electronic device can implement the above-mentioned method for determining the sealing property of a fault for CO2 geological storage.

[0030] A computer storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement the above-mentioned method for determining the fault sealing property of CO2 geological storage.

[0031] By means of the above technical solution, the present application provides a method for determining the fault sealing property of CO2 geological storage, by determining whether the lithology of the cap layer corresponding to the reservoir composed of CO2 meets the preset conditions, the preset conditions include that the lithology is shale and the proportion of clay minerals meets the preset range; when the lithology of the cap layer does not meet the preset conditions, the difference between the displacement pressure of the fault formed between the cap layer and the reservoir and the reservoir is calculated; when the difference in displacement pressure is not greater than zero, the cap layer thickness, reservoir thickness and fault distance are determined according to the fault profile, and the fault sealing property of CO2 geological storage is determined according to the numerical ranking relationship of the cap layer thickness, reservoir thickness and fault distance, the fault sealing property includes: complete fault sealing, partial fault sealing and no fault sealing, and finally the fault sealing property of CO2 geological storage is determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a flow chart of a method for determining fault sealing properties for CO2 geological storage provided in an embodiment of the present application;

[0034] FIG2 is a schematic diagram of a cross-sectional view of a normal fault and a reverse fault provided in an embodiment of the present application;

[0035] FIG3 is a schematic diagram of the classification of fault sealing and fault determination indicators provided by an embodiment of the present application;

[0036] FIG4 is a schematic structural diagram of a device for determining fault sealing properties for CO2 geological storage provided in an embodiment of the present application;

[0037] FIG5 is a schematic structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and claims of this application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless the context clearly indicates otherwise.

[0039] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0040] The "multiple" involved in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the words "first" and "second" are only used for the purpose of distinguishing the description and cannot be understood as indicating or implying relative importance or order.

[0041] Currently, with the rapid increase in human industrial activity, large amounts of CO2 are being released into the atmosphere, leading to the continuous accumulation of the greenhouse effect. This has ultimately led to a series of natural disasters, including global warming, glacier melting, and sea level rise, seriously endangering human life and safety. Therefore, how to deal with the increasing amount of CO2 in the atmosphere has become an urgent issue. Geological storage of CO2 is considered one of the most promising technologies for controlling CO2 emissions.

[0042] If CO2 geological storage technology is to be applied in practice, the fault sealing properties of the CO2 geological storage must be determined. However, the method for determining the fault sealing properties of CO2 geological storage differs from conventional methods, so a method for determining the fault sealing properties of CO2 geological storage is needed.

[0043] The inventors have discovered that in CO2 geological storage technology, the CO2 in the reservoir composed of CO2 is in a supercritical state. The viscosity of CO2 in the supercritical state is similar to that of gaseous CO2, and the density is similar to that of liquid CO2. In addition, the self-diffusion coefficient of CO2 in the supercritical state is 0.002. When a fracture occurs between the cap rock and the reservoir, the supercritical CO2 will enter the cap rock composed of clay mineral-rich shale and interact with the clay mineral-rich shale, causing the clay mineral-rich shale to expand. The expanded shale will close the fault formed when the fracture occurs between the reservoir composed of CO2 and the cap rock composed of clay mineral-rich shale. Fault closure can effectively seal the CO2 and prevent it from seeping. Therefore, when the lithology of the cap rock meets the preset conditions, the fault closure results in zero permeability of the fault, and the fault sealing property of CO2 geological storage is complete fault closure.

[0044] Based on the above analysis, this application proposes a method for determining the fault sealing property of CO2 geological storage and related devices. The application will be introduced in detail below in conjunction with specific embodiments. Example 1

[0045] FIG1 shows a flow chart of a method for determining fault sealing for CO2 geological storage provided in an embodiment of the present application.

[0046] As shown in FIG1 , a method for determining the sealing property of a fault for CO2 geological storage provided in an embodiment of the present application specifically includes:

[0047] S10. Determine whether the lithology of the cap rock corresponding to the reservoir composed of CO2 meets preset conditions.

[0048] In the embodiment of the present application, it is necessary to determine whether the lithology of the cap rock corresponding to the CO2 reservoir meets the preset conditions. The preset conditions include that the lithology of the cap rock is shale and the clay mineral content in the shale is within the range of 65% to 85%.

[0049] It should be noted that, when it is determined in step S10 that the lithology of the cap rock corresponding to the reservoir composed of CO2 meets the preset conditions, the fault closure causes the permeability of the fault to be zero, and CO2 can be well sealed in the reservoir without penetration. Therefore, the fault sealing property of CO2 geological storage is complete fault closure; when it is determined in step S10 that the lithology of the cap rock corresponding to the reservoir composed of CO2 does not meet the preset conditions, step S20 is executed to calculate the difference in displacement pressure between the fault formed between the cap rock and the reservoir and the reservoir.

[0050] S20. Calculate the difference in displacement pressure between the fault formed between the cap rock and the reservoir and the reservoir.

[0051] In some embodiments, the key parameter for evaluating the closure of a fault for CO2 geological storage is the displacement pressure of the fault rock. Only when the displacement pressure of the fault rock exceeds the displacement pressure of the reservoir rock can the fault function as a lateral CO2 geological storage mechanism, i.e., the fault closure for CO2 geological storage is complete. When the displacement pressure of the fault rock is not greater than the displacement pressure of the reservoir rock, whether the fault functions as a lateral CO2 geological storage mechanism depends on the caprock thickness, reservoir thickness, and fault throw in the fault profile. The fault closure for CO2 geological storage is determined based on the numerical order of the caprock thickness, reservoir thickness, and fault throw.

[0052] Therefore, in the embodiment of the present application, the difference in displacement pressure between the fault formed between the cap rock and the reservoir and the reservoir is calculated, and whether the difference in displacement pressure is greater than zero is used to judge the fault sealing quality of CO2 geological storage.

[0053] Specifically, the functional relationship between the displacement pressure of reservoir rock and the shale content and the burial depth of reservoir rock is established using experimental data, and recorded as the first functional relationship:

[0054]

[0055] Where p dr is the displacement pressure of reservoir rock, V shr is the mud content of reservoir rock, Z r is the burial depth of the reservoir rock, p and q are constants related to the area where the reservoir is located. It can be obtained by fitting the product relationship between the displacement pressure of the reservoir rock measured in the Qikou Sag and its compaction diagenetic burial depth and mud content. In actual application, the mud content of the reservoir rock can be obtained according to the natural gamma curve value, and the compaction diagenetic burial depth is the present burial depth.

[0056] Similarly, the functional relationship between the displacement pressure of fault rock and the mud content and the compaction diagenesis depth is established using experimental data, and recorded as the second functional relationship:

[0057]

[0058] Where p df is the displacement pressure of fault rock, V shf is the mud content of the fault rock, Z f is the burial depth of the fault rock, a and b are constants related to the area where the fault is located, which can be obtained by fitting the relationship between the displacement pressure of the fault rock measured in the Qikou Sag and the product of its compacted diagenetic burial depth and mud content.

[0059] The displacement pressure of the reservoir rock and the displacement pressure of the fault rock can be obtained respectively through the first functional relationship and the second functional relationship. The difference between the displacement pressures of the reservoir rock and the displacement pressure of the fault rock obtained by the first functional relationship and the second functional relationship can be obtained and recorded as the third functional relationship:

[0060] Δp=p df -p dr

[0061] Where Δp is the displacement pressure difference, p df is the displacement pressure of fault rock, p dr is the displacement pressure of the reservoir rock. It should be noted that, if the difference Δp between the displacement pressures of the fault rock formed between the cap rock and the reservoir rock and the reservoir rock calculated in step S20 is less than zero, the fault sealing property of the CO2 geological storage is complete fault sealing; if the difference Δp between the displacement pressures of the fault rock formed between the cap rock and the reservoir rock and the reservoir rock calculated in step S20 is not greater than zero, step S30 is executed. If the displacement pressure difference Δp is not greater than zero, the cap rock thickness, reservoir thickness, and fault throw are determined based on the fault profile of the normal fault and the reverse fault, and the fault sealing property of the CO2 geological storage is determined based on the numerical order relationship of the cap rock thickness, reservoir thickness, and fault throw.

[0062] S30. When the difference in displacement pressure is not greater than zero, determine the cap rock thickness, reservoir thickness, and fault throw based on the fault profile, and determine the fault sealing property of the CO2 geological storage based on the numerical ranking relationship among the cap rock thickness, reservoir thickness, and fault throw.

[0063] In an embodiment of the present application, when the difference in displacement pressure between the fault formed between the cap rock and the reservoir and the reservoir calculated in the above step S20 is not greater than zero, step S30 is executed. When the difference in displacement pressure is not greater than zero, the cap rock thickness, reservoir thickness and fault distance are determined based on the fault profile, and the fault sealing property of CO2 geological storage is determined based on the numerical ranking relationship of the cap rock thickness, reservoir thickness and fault distance.

[0064] In some embodiments, the cap rock thickness (C) and reservoir thickness (R) in the fault profile can be directly obtained based on the fault profile obtained by measuring the movement of the earth's crust, and the fault spacing (L) can be determined based on the spacing between the contact surfaces of the cap rock and the reservoir in the fault profile.

[0065] Specifically, since the fault plane formed after the cap rock and reservoir fracture will slide, the fault is divided into normal faults and reverse faults according to the sliding direction of the fault plane. A normal fault refers to a fault in which the upper wall of the fault drops relatively and the lower wall of the fault rises relatively after the fault is formed; a reverse fault is the opposite, which means that after the fault is formed, the upper wall of the fault rises relatively and the lower wall of the fault falls relatively.

[0066] FIG2 shows a cross-sectional view of a normal fault and a reverse fault provided in an embodiment of the present application.

[0067] As shown in Figure 2, Figure 2 shows the determination of the cap rock thickness (C), reservoir thickness (R) and fault spacing (L) based on the fault profile of the normal fault and reverse fault provided in the embodiment of the present application, and the determination of the fault sealing property of CO2 geological storage based on the numerical ranking relationship of the cap rock thickness (C), reservoir thickness (R) and fault spacing (L).

[0068] It should be pointed out that the definition of a normal fault in Figure 2 is that the fault and the formation are in the same direction, and the dip angle of the fault plane is relatively steep, usually above 45°. Figure 2 shows the numerical ranking relationship of the cap rock thickness (C), reservoir thickness (R), and fault spacing (L) of six different normal faults; the definition of a reverse fault in Figure 2 is that the fault and the formation are in opposite directions, and the dip angle of the fault plane is relatively gentle, usually below 45°. Figure 2 also shows the numerical ranking relationship of the cap rock thickness (C), reservoir thickness (R), and fault spacing (L) of six different reverse faults.

[0069] It should also be noted that the fault sealing properties of CO2 geological storage of normal faults and reverse faults are determined based on the numerical ranking relationships of the cap rock thickness (C), reservoir thickness (R) and fault spacing (L) of six different normal faults and the numerical ranking relationships of the cap rock thickness (C), reservoir thickness (R) and fault spacing (L) of six different reverse faults shown in Figure 2.

[0070] FIG3 shows a schematic diagram of classifying fault sealing properties based on fault determination indicators provided in an embodiment of the present application.

[0071] As shown in Figure 3, in the embodiment of the present application, the fault closure of CO2 geological storage is divided into three categories, namely Class I, Class II and Class III, where Class I represents that the fault closure of CO2 geological storage is completely closed, Class II represents that the fault closure of CO2 geological storage is partially closed, and Class III represents that the fault closure of CO2 geological storage is not closed.

[0072] As can be seen from Figure 3, the fault sealing property of CO2 geological storage represented by Class I is that the fault is completely sealed, which requires the cap rock thickness (C) to be greater than the fault spacing (L) and greater than the reservoir thickness (R). Regardless of whether it is a normal fault or a reverse fault, as long as the fault determination indicators meet the conditions of cap rock thickness (C) greater than fault spacing (L) and greater than reservoir thickness (R), such a fault is considered to be Class I, and the fault sealing property of CO2 geological storage represented by Class I is completely sealed.

[0073] Figure 3 also shows that Category II, representing partially sealed faults for CO2 geological storage, has two fault determination indicators for normal and reverse faults, respectively. However, both require that the caprock thickness (C) be greater than the fault spacing (L). It should be noted that for Category II, representing partially sealed normal faults, the caprock thickness (C) must be greater than the reservoir thickness (R) and greater than the fault spacing (L), or the reservoir thickness (R) must be greater than the caprock thickness (C) and greater than the fault spacing (L). For reverse faults, the caprock thickness (C) must be greater than the reservoir thickness (R) and greater than the fault spacing (L), or the reservoir thickness (R) must be greater than the caprock thickness (C) and greater than the fault spacing (L). Similarly, for reverse faults, the caprock thickness (C) must be greater than the reservoir thickness (R) and greater than the fault spacing (L), or the reservoir thickness (R) must be greater than the caprock thickness (C) and greater than the fault spacing (L).

[0074] Figure 3 also shows that Category III represents the fault closure of CO2 geological storage, which is characterized by no fault closure. Normal faults and reverse faults each have three fault determination indicators. However, both the fault determination indicator for normal faults and the fault determination indicator for reverse faults require that the fault spacing (L) be greater than the caprock thickness (C). It should be noted that in normal faults of type III, which represent fault sealing for CO2 geological storage, the fault spacing (L) must be greater than the cap rock thickness (C) and greater than the reservoir thickness (R), or the reservoir thickness (R) must be greater than the fault spacing (L) and greater than the cap rock thickness (C), or the fault spacing (L) must be greater than the reservoir thickness (R) and greater than the cap rock thickness (C). In reverse faults, the fault spacing (L) must also be greater than the cap rock thickness (C) and greater than the reservoir thickness (R), or the reservoir thickness (R) must be greater than the fault spacing (L) and greater than the cap rock thickness (C), or the fault spacing (L) must be greater than the reservoir thickness (R) and greater than the cap rock thickness (C). Example 2

[0075] FIG4 shows a schematic structural diagram of a device for determining the fault sealing property of CO2 geological storage provided in an embodiment of the present application.

[0076] As shown in FIG4 , an apparatus for determining the sealing property of a fault for CO2 geological storage provided in an embodiment of the present application includes:

[0077] The judgment unit 401 is used to determine whether the lithology of the cap rock corresponding to the reservoir composed of CO2 meets the preset conditions, wherein the preset conditions include that the lithology is shale and the clay mineral ratio meets the preset range;

[0078] The calculation unit 402 is configured to calculate the difference in displacement pressure between the fault formed between the cap layer and the reservoir and the reservoir when the lithology of the cap layer does not meet a preset condition;

[0079] Determination unit 403 is used to determine the cap rock thickness, reservoir thickness and fault throw based on the fault profile when the difference in displacement pressure is not greater than zero, and determine the fault sealing property of CO2 geological storage based on the numerical order relationship of the cap rock thickness, reservoir thickness and fault throw. The fault sealing property includes: complete fault sealing, partial fault sealing and no fault sealing. Example 3

[0080] FIG5 is a schematic diagram of an electronic device provided in an embodiment of the present application.

[0081] An electronic device provided in an embodiment of the present application includes at least one processor and a memory connected to the processor, wherein the memory is used to store a computer program and the processor is used to execute the computer program, so that the electronic device can implement the above-mentioned method for determining the fault sealing property of CO2 geological storage.

[0082] Referring to FIG5 , a schematic diagram of the structure of an electronic device suitable for implementing the embodiments of the present application is shown. The electronic devices in the embodiments of the present application may include, but are not limited to, fixed terminals such as mobile phones, laptop computers, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, and the like. The electronic device shown in FIG5 is merely an example and should not limit the functionality and scope of use of the embodiments of the present application.

[0083] As shown in Figure 5, the electronic device may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 501, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 502 or a program loaded from a storage device 508 into a random access memory (RAM) 503. When the electronic device is powered on, the RAM 503 also stores various programs and data required for the operation of the electronic device. The processing device 501, ROM 502, and RAM 503 are connected to each other via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0084] Typically, the following devices may be connected to the I / O interface 505: an input device 506 including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 507 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 508 including, for example, a memory card, a hard disk, etc.; and a communication device 509. The communication device 509 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Although FIG. 5 illustrates an electronic device having various devices, it should be understood that not all of the illustrated devices are required to be implemented or present. More or fewer devices may alternatively be implemented or present. Example 4

[0085] Embodiments of the present application provide a computer-readable storage medium, which is applied to an electronic device. The computer-readable storage medium carries one or more programs. When executed by the electronic device, the one or more programs enable the electronic device to implement the method for determining fault sealing for CO2 geological storage described in Example 1.

[0086] In the context of the present application, a machine-readable medium can be a tangible medium that can contain or store a program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium can include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0087] It should be noted that the computer-readable medium mentioned above in this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this application, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, device, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. This propagated data signal can take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to wires, optical cables, RF (radio frequency), etc., or any suitable combination thereof.

[0088] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0089] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

Claims

1. A method for determining fault sealing for CO2 geological storage, characterized in that: include: Determine whether the lithology of the cap rock corresponding to the reservoir composed of CO2 meets the preset conditions, wherein the preset conditions include that the lithology is shale and the proportion of clay minerals meets the preset range; When the lithology of the cap layer does not satisfy the preset condition, calculating the difference between the displacement pressure of the fault formed between the cap layer and the reservoir and the reservoir; When the difference in displacement pressure is not greater than zero, the cap rock thickness, reservoir thickness and fault distance are determined based on the fault profile, and the fault closure of the CO2 geological storage is determined based on the numerical ranking relationship of the cap rock thickness, reservoir thickness and fault distance. The fault closure includes: complete fault closure, partial fault closure and no fault closure.

2. The method for determining fault sealing of CO2 geological storage according to claim 1, characterized in that: The clay mineral proportions satisfying the preset range include: The proportion of the clay minerals is within a range of 65% to 85%.

3. The method for determining fault sealing of CO2 geological storage according to claim 1, characterized in that: Also includes: When the lithology of the cap rock satisfies the preset conditions, it is determined that the fault is completely closed.

4. The method for determining fault sealing of CO2 geological storage according to claim 1, characterized in that: Also includes: In the event that the difference in displacement pressures is greater than zero, the fault is determined to be completely sealed.

5. The method for determining fault sealing of CO2 geological storage according to claim 1, characterized in that: The calculating of the difference between the displacement pressure of the fault formed between the cap rock and the reservoir and the reservoir comprises: The displacement pressure difference is obtained by subtracting the displacement pressure of the reservoir from the displacement pressure of the fault formed between the cap rock and the reservoir.

6. The method for determining fault sealing of CO2 geological storage according to claim 5, characterized in that: Determining the fault sealing property of the CO2 geological storage according to the numerical ranking relationship of the cap rock thickness, the reservoir thickness and the fault distance includes: In the case where the cap rock thickness is greater than the fault throw and greater than the reservoir thickness, the fault sealing property of the CO2 geological storage is that the fault is completely sealed; In the case where the caprock thickness is greater than the fault spacing, the fault closure of the CO2 geological storage is partial closure of the fault; When the distance between the faults is greater than the thickness of the cap rock, the fault sealing property of the CO2 geological storage is that the fault is not sealed.

7. The method for determining fault sealing of CO2 geological storage according to claim 1, characterized in that: Determining the cap rock thickness, reservoir thickness and fault throw based on the fault profile includes: The cap rock thickness and the reservoir thickness are measured according to the fault profile, and the fault distance is determined according to the distance between the contact surfaces of the cap rock and the reservoir in the fault profile.

8. A device for determining the sealing property of a fault for CO2 geological storage, characterized in that: include: A judgment unit, used to determine whether the lithology of the cap rock corresponding to the reservoir composed of CO2 meets a preset condition, wherein the preset condition includes that the lithology is shale and the proportion of clay minerals meets a preset range; a calculation unit, configured to calculate a difference in displacement pressure between a fault formed between the cap layer and the reservoir and the reservoir when the lithology of the cap layer does not satisfy the preset condition; A determination unit is used to determine the cap rock thickness, reservoir thickness and fault distance according to the fault profile when the difference in the displacement pressure is not greater than zero, and determine the fault closure of the CO2 geological storage according to the numerical order relationship of the cap rock thickness, reservoir thickness and fault distance, wherein the fault closure includes: complete closure of the fault, partial closure of the fault and no closure of the fault.

9. An electronic device, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the electronic device can implement the method for determining the fault sealing property of CO2 geological storage as described in any one of claims 1 to 7.

10. A computer storage medium, characterized in that: The storage medium carries one or more computer programs, which, when executed by an electronic device, enable a processor to implement the method for determining fault sealing of CO2 geological storage as described in any one of claims 1 to 7.

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