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

Abstract

The present application discloses a method for determining the fault sealing property of CO2 geological storage and a related device, specifically determining whether the lithology of the cap rock corresponding to the reservoir composed of CO2 meets preset conditions, the preset conditions including that the lithology is shale and the proportion of clay minerals meets a preset range; when the lithology of the cap rock does not meet the preset conditions, calculating the difference in displacement pressure between the fault formed between the cap rock and the reservoir and the reservoir; when the difference in displacement pressure is not greater than zero, determining the cap rock thickness, reservoir thickness and fault throw based on the fault profile, and determining 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, and finally determining the fault sealing property of CO2 geological storage.

Description

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] Figure 1 A flow chart of a method for determining fault sealing for CO2 geological storage provided in an embodiment of the present application;

[0034] Figure 2 Schematic diagram of a fault cross-section of a normal fault and a reverse fault provided in an embodiment of the present application;

[0035] Figure 3 A schematic diagram of the classification of fault sealing and fault determination indicators provided in an embodiment of the present application;

[0036] Figure 4 A schematic diagram of the structure of a device for determining the sealing properties of a fault for CO2 geological storage provided in an embodiment of the present application;

[0037] Figure 5 A schematic diagram of the structure 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.

[0045] Example 1

[0046] Figure 1 A flow chart of a method for determining the sealing properties of a fault for CO2 geological storage provided in an embodiment of the present application is shown.

[0047] like Figure 1 As shown, the method for determining the sealing property of a fault for CO2 geological storage provided in the embodiment of the present application specifically includes:

[0048] S10. Determine whether the lithology of the cap rock corresponding to the reservoir composed of CO2 meets preset conditions.

[0049] 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%.

[0050] 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.

[0051] S20. Calculate the difference in displacement pressure between the fault formed between the cap rock and the reservoir and the reservoir.

[0052] 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.

[0053] 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.

[0054] 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:

[0055]

[0056] 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.

[0057] 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:

[0058]

[0059] 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.

[0060] 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:

[0061] Δp=p df -p dr

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] Figure 2 The fault cross-section diagrams of normal faults and reverse faults provided in the embodiments of the present application are shown in FIG.

[0068] like Figure 2 As shown, Figure 2 The embodiment of the present application provides a method for determining the cap rock thickness (C), reservoir thickness (R) and fault spacing (L) based on the fault profile of the normal fault and the reverse fault, and determining 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).

[0069] It should be pointed out that Figure 2 The definition of a normal fault is that the fault and the stratum are in the same direction, and the dip angle of the fault plane is steep, usually above 45°. Figure 2 The numerical ranking relationships of cap rock thickness (C), reservoir thickness (R), and fault spacing (L) for six different normal faults are shown; Figure 2 The definition of a reverse fault in the literature is that the fault and the stratum are in the opposite direction, and the dip angle of the fault plane is relatively gentle, usually below 45°. Figure 2 The CPC also shows the numerical ranking relationship between the cap rock thickness (C), reservoir thickness (R) and fault spacing (L) of six different reverse faults.

[0070] It should also be noted that according to Figure 2 The numerical ranking relationships of cap rock thickness (C), reservoir thickness (R) and fault spacing (L) of six different normal faults and the numerical ranking relationships of cap rock thickness (C), reservoir thickness (R) and fault spacing (L) of six different reverse faults are shown in the figure to determine the fault sealing properties of CO2 geological storage of normal faults and reverse faults.

[0071] Figure 3 2 shows a schematic diagram of classifying fault sealing properties based on fault determination indicators provided in an embodiment of the present application.

[0072] like Figure 3As shown, 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.

[0073] from Figure 3 It can be seen from the figure that the fault sealing property of CO2 geological storage represented by Class I is that the fault is completely sealed and the requirements are that the cap rock thickness (C) is 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 index meets the conditions that the cap rock thickness (C) is greater than the fault spacing (L) and greater than the 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.

[0074] from Figure 3 It can also be seen that Category II represents partially sealed faults for CO2 geological storage. Normal faults and reverse faults each have two fault determination indicators. However, both require that the caprock thickness (C) be greater than the fault spacing (L). It should be noted that for Category II, 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).

[0075] from Figure 3 It can also be seen that Class III represents the fault sealing of CO2 geological storage, which is the fault without sealing. There are three fault determination indicators for normal faults and reverse faults respectively. However, whether it is the fault determination indicator of normal faults or the fault determination indicator of reverse faults, the fault spacing (L) must be greater than the cover rock 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).

[0076] Example 2

[0077] Figure 4 A schematic structural diagram of a device for determining the fault sealing properties of CO2 geological storage provided in an embodiment of the present application is shown.

[0078] like Figure 4 As shown, an apparatus for determining the sealing property of a fault for CO2 geological storage provided in an embodiment of the present application includes:

[0079] 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;

[0080] 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;

[0081] 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.

[0082] Example 3

[0083] Figure 5 A schematic diagram of an electronic device provided in an embodiment of the present application.

[0084] 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.

[0085] refer to Figure 5 , which shows a schematic diagram of the structure of an electronic device suitable for implementing the embodiments of the present application. The electronic device in the embodiments of the present application may include but is not limited to fixed terminals such as mobile phones, laptops, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, etc. Figure 5 The electronic device shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0086] like Figure 5As shown, 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.

[0087] 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 Figure 5 The electronic device is shown with various devices, but it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed instead.

[0088] Example 4

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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 become 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.

[0093] 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 the sealing properties of a fault for CO2 geological storage, characterized in that: include: Determining whether the lithology of the cap rock corresponding to the CO2 reservoir meets preset conditions, wherein the preset conditions include that the lithology is shale and the clay mineral ratio meets a preset range; The clay mineral proportions that meet the preset range include: The proportion of the clay minerals falls within the range of 65% to 85%; When the lithology of the cap rock does not satisfy the preset condition, calculating the difference between the displacement pressure of the fault formed between the cap rock and the reservoir and the displacement pressure of the reservoir; When the difference in the displacement pressure is not greater than zero, the cap rock thickness, reservoir thickness and fault throw are determined based on the fault profile, and the fault sealing property of the 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.

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

3. The method for determining fault sealing properties for 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.

4. The method for determining fault sealing properties for 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.

5. The method for determining fault sealing properties for CO2 geological storage according to claim 4, characterized in that: Determining the fault sealing property of the CO2 geological storage based on the numerical ranking relationship of the cap rock thickness, the reservoir thickness and the fault throw includes: In the case where the cap rock thickness is greater than the fault throw and the reservoir thickness is greater than the fault throw, the fault sealing property of the CO2 geological storage is complete sealing of the fault; In the case where the thickness of the cap rock is greater than the distance between the faults, the fault sealing property of the CO2 geological storage is partial sealing of the fault; When the distance between the faults is greater than the thickness of the caprock, the fault sealing property of the CO2 geological storage is that the fault has no sealing property.

6. The method for determining fault sealing properties for 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 layer thickness and the reservoir layer thickness are measured according to the fault profile, and the fault throw is determined according to the distance between the contact surfaces of the cap layer and the reservoir layer in the fault profile.

7. A device for determining the sealing property of a fault for CO2 geological storage, characterized in that: include: a judgment unit, configured to determine whether the lithology of the cap rock corresponding to the CO2 reservoir satisfies a preset condition, wherein the preset condition includes that the lithology is shale and the proportion of clay minerals satisfies a preset range; The clay mineral proportion meeting the preset range includes: the clay mineral proportion meeting the interval range of 65% to 85%; 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 throw based on the fault profile when the difference in the displacement pressure is not greater than zero, and determine the fault sealing property of the CO2 geological storage based on the numerical order relationship of the cap rock thickness, reservoir thickness and fault throw, wherein the fault sealing property includes: complete fault sealing, partial fault sealing and no fault sealing.

8. An electronic device, characterized in that: comprising at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is configured to execute the computer program so that the electronic device can implement the method for determining fault sealing properties of CO2 geological storage according to any one of claims 1 to 6.

9. 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 perform the method for determining fault sealing of CO2 geological storage according to any one of claims 1 to 6.

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