Method and device for determining fluid hosting pore size interval in oil reservoir, equipment and medium

Abstract

Embodiments of the present application disclose a method, device, equipment and medium for determining fluid hosting pore size interval in an oil reservoir. The method comprises: performing nuclear magnetic resonance (NMR) testing on a target rock sample to obtain a two-dimensional NMR spectrum of the target rock sample; determining a target fluid hosting state of the target rock sample and target position information of the target fluid hosting state in the two-dimensional NMR spectrum according to the two-dimensional NMR spectrum; performing mercury injection testing on the target rock sample to obtain a pore size distribution curve of the target rock sample; converting the transverse relaxation time in the two-dimensional NMR spectrum into pore size to obtain a converted NMR spectrum according to the NMR T2 spectrum and the pore size distribution curve of the target rock sample; and determining a target hosting pore size interval corresponding to the target fluid hosting state according to the converted NMR spectrum and the target position information. The technical solution adopts a combined testing mode of NMR-mercury injection, and can accurately determine the pore size interval of fluid hosting in an oil reservoir through parameter conversion.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration, and in particular to a method, device, equipment and medium for determining a pore size interval of fluid storage in an oil reservoir. Background Art

[0002] The pore size range in which fluids in an oil reservoir reside within the rock is one of the key factors limiting the effective development of these fluids. Related techniques have conducted nitrogen adsorption experiments on pristine samples, samples after dehydration and activation, samples after pentane extraction, and samples after dichloromethane extraction. Based on the changes in pore structure before and after different treatments, the pore size ranges for different fluids are determined. However, the limited pore size range measurable by nitrogen adsorption can lead to deviations in the measurement results. Summary of the Invention

[0003] The present invention provides a method, device, equipment and medium for determining the pore size interval of fluid storage in an oil reservoir, which adopts a combined nuclear magnetic resonance-mercury injection testing method and can accurately determine the pore size interval of fluid storage in an oil reservoir through parameter conversion.

[0004] According to one aspect of the present invention, a method for determining a pore size interval for fluid storage in an oil reservoir is provided, the method comprising:

[0005] Performing a nuclear magnetic resonance test on a target rock sample to obtain a two-dimensional nuclear magnetic resonance spectrum of the target rock sample; wherein the target rock sample is obtained based on the oil well to be tested;

[0006] determining the target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum according to the two-dimensional nuclear magnetic resonance spectrum;

[0007] Performing a mercury intrusion test on the target rock sample to obtain a pore size distribution curve of the target rock sample;

[0008] According to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve, the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum is converted into pore size to obtain a conversion nuclear magnetic resonance spectrum;

[0009] A target occurrence pore size interval corresponding to the occurrence state of the target fluid is determined according to the converted nuclear magnetic resonance spectrum and the target position information.

[0010] According to another aspect of the present invention, there is provided a device for determining a pore size interval of fluid storage in an oil reservoir, comprising:

[0011] a two-dimensional nuclear magnetic resonance spectrum determination module, configured to perform a nuclear magnetic resonance test on a target rock sample to obtain a two-dimensional nuclear magnetic resonance spectrum of the target rock sample; wherein the target rock sample is obtained based on an oil well to be tested;

[0012] a fluid occurrence state determination module, configured to determine the target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum based on the two-dimensional nuclear magnetic resonance spectrum;

[0013] a pore size distribution curve diagram determination module, configured to perform a mercury intrusion test on the target rock sample to obtain a pore size distribution curve diagram of the target rock sample;

[0014] a conversion nuclear magnetic resonance spectrum determination module, configured to convert the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum into the pore size to obtain a conversion nuclear magnetic resonance spectrum based on the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve;

[0015] The occurrence pore size interval determination module is used to determine the target occurrence pore size interval corresponding to the occurrence state of the target fluid according to the converted nuclear magnetic resonance spectrum and the target position information.

[0016] According to another aspect of the present invention, an electronic device is provided, comprising:

[0017] at least one processor; and

[0018] a memory communicatively connected to the at least one processor; wherein,

[0019] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the pore size interval of fluid storage in an oil reservoir as described in any embodiment of the present invention.

[0020] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the pore size interval of fluid storage in an oil reservoir as described in any embodiment of the present invention when executed.

[0021] The technical solution of the embodiment of the present invention is to perform a nuclear magnetic resonance test on a target rock sample to obtain a two-dimensional nuclear magnetic resonance spectrum of the target rock sample; wherein the target rock sample is obtained based on the oil well to be tested; the target fluid occurrence state of the target rock sample and the target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum are determined based on the two-dimensional nuclear magnetic resonance spectrum; a mercury injection test is performed on the target rock sample to obtain a pore size distribution curve diagram of the target rock sample; based on the nuclear magnetic resonance T2 spectrum and the pore size distribution curve diagram of the target rock sample, the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum is converted into pore size to obtain a converted nuclear magnetic resonance spectrum; based on the converted nuclear magnetic resonance spectrum and the target position information, the target occurrence pore size range corresponding to the target fluid occurrence state is determined. This technical solution adopts a combined nuclear magnetic resonance-mercury injection testing method, which can accurately determine the pore size range of fluid occurrence in the reservoir through parameter conversion.

[0022] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a flow chart of a method for determining a pore size interval for fluid storage in an oil reservoir according to a first embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of a two-dimensional nuclear magnetic resonance spectrum provided according to Example 1 of the present invention;

[0026] Figure 3 is a schematic diagram of determining the occurrence state of a target fluid according to the first embodiment of the present invention;

[0027] Figure 4 2 is a schematic structural diagram of a device for determining a pore size interval for fluid occurrence in an oil reservoir according to a second embodiment of the present invention;

[0028] Figure 5 The present invention is a schematic structural diagram of an electronic device for implementing a method for determining a pore size interval for fluid storage in an oil reservoir according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", "target", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] Example 1

[0032] Figure 1 This is a flow chart of a method for determining the pore size interval of fluid occurrence in an oil reservoir provided in the first embodiment of the present invention. This embodiment is applicable to the case of determining the pore size interval of fluid occurrence in an oil reservoir. The method can be executed by a device for determining the pore size interval of fluid occurrence in an oil reservoir. The device for determining the pore size interval of fluid occurrence in an oil reservoir can be implemented in the form of hardware and / or software. The device for determining the pore size interval of fluid occurrence in an oil reservoir can be configured in an electronic device with data processing capabilities. Figure 1 As shown, the method includes:

[0033] S110, performing a nuclear magnetic resonance test on a target rock sample to obtain a two-dimensional nuclear magnetic resonance spectrum of the target rock sample; wherein the target rock sample is obtained based on the oil well to be tested.

[0034] Among them, the oil well to be tested may refer to an oil well waiting to be tested, which can be determined in advance according to actual needs. The target rock sample may refer to a rock sample for testing obtained based on the oil well to be tested. For example, a certain number and volume of rock cores can be collected from the oil well to be tested under closed conditions as target rock samples. It should be noted that in order to maintain the original environment of the target rock sample (such as formation pressure and temperature, etc.), the target rock sample needs to be immediately frozen or wax-sealed. The two-dimensional nuclear magnetic resonance spectrum can be described by the longitudinal relaxation time (T1) and the transverse relaxation time (T2).

[0035] In this embodiment, a target rock sample is first obtained based on the oil well to be tested, and a nuclear magnetic resonance test is performed on the target rock sample to obtain a two-dimensional nuclear magnetic resonance spectrum of the target rock sample. Figure 2 This is a schematic diagram of a two-dimensional nuclear magnetic resonance spectrum provided in Example 1 of the present invention. Figure 2 As shown, the units of T1 and T2 are both ms.

[0036] S120, determining the target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum according to the two-dimensional nuclear magnetic resonance spectrum.

[0037] The fluids in the rock sample can include oil and water. Optionally, the target fluid's occurrence states include at least two of the following: pore water, bound water, adsorbed oil, and free oil. The target position information can be used to characterize the location of the target fluid's occurrence state in a two-dimensional nuclear magnetic resonance spectrum.

[0038] In this embodiment, after obtaining a two-dimensional nuclear magnetic resonance spectrum of a target rock sample, the target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum can be determined based on the two-dimensional nuclear magnetic resonance spectrum. Optionally, determining the target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum based on the two-dimensional nuclear magnetic resonance spectrum includes: determining a reference baseline based on the ratio of the longitudinal relaxation time to the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum; and determining the target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum based on the reference baseline.

[0039] Figure 3 A schematic diagram of determining the occurrence state of a target fluid provided in Example 1 of the present invention.

[0040] Among them, the two oblique dotted lines are reference baselines, representing T1 / T2=10 and T1 / T2=1 respectively. Based on the location maps of different fluid occurrence states provided in related research (2D NMR response characteristics of Jimusar shale oil reservoir) and combined with actual test experience, we can Figure 3 The two reference baselines in the 2D NMR spectrum are used to determine the target position information of pore water, bound water, adsorbed oil and free oil, respectively, namely Figure 3 The four enclosed areas in Figure 3 For example, the target position information of the occurrence states of four target fluids in the two-dimensional nuclear magnetic resonance spectrum can be seen in Table 1:

[0041] Table 1 Target position information of the four target fluid occurrence states in the two-dimensional NMR spectra

[0042] Target fluid occurrence state T2 / ms T1 / T2 pore water ＜0.5 ＜100 Bound water, adsorbed oil 0.5-20 1-20、10-100 Free oil ＞20 2-20

[0043] S130, performing a mercury intrusion test on the target rock sample to obtain a pore size distribution curve of the target rock sample.

[0044] In this embodiment, after determining the target fluid occurrence state of the target rock sample and the target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum based on the two-dimensional nuclear magnetic resonance spectrum, a mercury injection test can be performed on the target rock sample to obtain the corresponding relationship between the pore size and the mercury injection amount, and a pore size distribution curve of the target rock sample can be determined based on the corresponding relationship.

[0045] S140 , based on the nuclear magnetic resonance T2 spectrum and the pore size distribution curve of the target rock sample, convert the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum into pore size to obtain a converted nuclear magnetic resonance spectrum.

[0046] In this embodiment, after obtaining the pore size distribution curve of the target rock sample, the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum can be converted into pore size based on the nuclear magnetic resonance T2 spectrum and the pore size distribution curve of the target rock sample to obtain a conversion nuclear magnetic resonance spectrum. Optionally, according to the nuclear magnetic resonance T2 spectrum and the pore size distribution curve of the target rock sample, the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum is converted into pore size to obtain a conversion nuclear magnetic resonance spectrum, including: determining a target conversion coefficient based on the nuclear magnetic resonance T2 spectrum and the pore size distribution curve of the target rock sample; and converting the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum into pore size based on the target conversion coefficient to obtain the conversion nuclear magnetic resonance spectrum.

[0047] The target conversion coefficient can be used to convert the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum into the pore size. In this embodiment, the target conversion coefficient is first determined based on the nuclear magnetic resonance T2 spectrum and the pore size distribution curve of the target rock sample. Optionally, the target conversion coefficient is determined based on the nuclear magnetic resonance T2 spectrum and the pore size distribution curve of the target rock sample, including: based on at least two candidate conversion coefficients, determining a candidate error based on the nuclear magnetic resonance T2 spectrum and the pore size distribution curve of the target rock sample; determining the candidate conversion coefficient corresponding to the minimum value among the candidate errors as the target conversion coefficient; wherein the candidate error is used to characterize the degree of difference between the first reference value and the second reference value, the first reference value being the logarithmic difference between the transverse relaxation time in the nuclear magnetic resonance T2 spectrum and the candidate conversion coefficient, and the second reference value being the logarithmic value of the pore size in the pore size distribution curve.

[0048] For example, assume that the relationship between the transverse relaxation time T2, the aperture r, and the conversion coefficient C is expressed as T2 = C × r. Taking the logarithm of both sides of T2 = C × r yields lgT2 = lgC + lgr, or lgT2 - lgC = lgr. Here, lg represents the logarithm, lgT2 - lgC represents the first reference value, and lgr represents the second reference value. Under different candidate conversion coefficients, the error between lgT2 - lgC and lgr is calculated to obtain the corresponding candidate error. The minimum value is found from all candidate errors, and the candidate conversion coefficient corresponding to the minimum value is determined as the target conversion coefficient.

[0049] After determining the target conversion coefficient, the transverse relaxation time in the two-dimensional NMR spectrum can be converted to an aperture according to the target conversion coefficient, thereby obtaining a converted NMR spectrum. Specifically, parameter conversion can be performed based on T2=C×r.

[0050] S150, determining a target occurrence pore size interval corresponding to the occurrence state of the target fluid according to the converted nuclear magnetic resonance spectrum and the target position information.

[0051] In this embodiment, after obtaining the conversion NMR spectrum, a target occurrence pore size range corresponding to the target fluid occurrence state can be determined based on the conversion NMR spectrum and the target position information. Optionally, determining the target occurrence pore size range corresponding to the target fluid occurrence state based on the conversion NMR spectrum and the target position information includes: determining a boundary line of the target fluid occurrence state based on the target position information; and determining the target occurrence pore size range corresponding to the target fluid occurrence state based on the boundary line.

[0052] like Figure 3 As shown in FIG, two vertical dashed lines represent dividing lines, which can be determined according to the boundary positions of different target fluid occurrence states. Among them, the left dividing line represents T2=0.5, and the right dividing line represents T2=20. Specifically, Figure 3 The two dividing lines in the figure divide the pore size range into three pore size intervals. The pore size interval on the left is micropores, and the corresponding target pore size interval is <25nm; the pore size interval in the middle is mesopores, and the corresponding target pore size interval is 25nm-1000nm; the pore size interval on the right is macropores, and the corresponding target pore size interval is >1000nm. Figure 3 For example, the target occurrence pore size intervals corresponding to the occurrence states of the four target fluids can be found in Table 2:

[0053] Table 2 Target occurrence pore size intervals corresponding to the occurrence states of the four target fluids

[0054] Target fluid occurrence state T2 / ms Target occurrence aperture range pore water ＜0.5 Micropores (<25nm) Bound water, adsorbed oil 0.5-20 Mesopores (25nm-1000nm) Free oil ＞20 Macropores (>1000nm)

[0055] As shown in Table 2, combined Figure 3 It can be seen that since the pore water is located in Figure 3 The target pore size interval corresponding to pore water is less than 25 nm. Figure 3 Therefore, the target pore size range for bound water and adsorbed oil is 25nm-1000nm. Figure 3 Therefore, the target pore size interval corresponding to free oil is >1000nm.

[0056] The technical solution of the embodiment of the present invention is to perform a nuclear magnetic resonance test on a target rock sample to obtain a two-dimensional nuclear magnetic resonance spectrum of the target rock sample; wherein the target rock sample is obtained based on the oil well to be tested; the target fluid occurrence state of the target rock sample and the target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum are determined based on the two-dimensional nuclear magnetic resonance spectrum; a mercury injection test is performed on the target rock sample to obtain a pore size distribution curve diagram of the target rock sample; based on the nuclear magnetic resonance T2 spectrum and the pore size distribution curve diagram of the target rock sample, the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum is converted into pore size to obtain a converted nuclear magnetic resonance spectrum; based on the converted nuclear magnetic resonance spectrum and the target position information, the target occurrence pore size range corresponding to the target fluid occurrence state is determined. This technical solution adopts a combined nuclear magnetic resonance-mercury injection testing method, which can accurately determine the pore size range of fluid occurrence in the reservoir through parameter conversion.

[0057] Example 2

[0058] Figure 4 This is a schematic diagram of the structure of a device for determining the pore size interval of fluid occurrence in an oil reservoir provided by the second embodiment of the present invention. The device can execute the method for determining the pore size interval of fluid occurrence in an oil reservoir provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. Figure 4 As shown, the device includes:

[0059] A two-dimensional nuclear magnetic resonance spectrum determination module 210 is configured to perform a nuclear magnetic resonance test on a target rock sample to obtain a two-dimensional nuclear magnetic resonance spectrum of the target rock sample; wherein the target rock sample is obtained based on an oil well to be tested;

[0060] a fluid occurrence state determination module 220 for determining the target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum based on the two-dimensional nuclear magnetic resonance spectrum;

[0061] A pore size distribution curve diagram determining module 230 is configured to perform a mercury intrusion test on the target rock sample to obtain a pore size distribution curve diagram of the target rock sample;

[0062] a conversion NMR spectrum determination module 240 for converting the transverse relaxation time in the two-dimensional NMR spectrum into pore size to obtain a conversion NMR spectrum based on the NMR T2 spectrum of the target rock sample and the pore size distribution curve;

[0063] The occurrence pore size interval determination module 250 is configured to determine a target occurrence pore size interval corresponding to the occurrence state of the target fluid according to the converted nuclear magnetic resonance spectrum and the target position information.

[0064] Optionally, the converted nuclear magnetic resonance spectrum determination module 240 includes:

[0065] a target conversion coefficient determination unit, configured to determine a target conversion coefficient based on the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve;

[0066] The conversion nuclear magnetic resonance spectrum determining unit is used to convert the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum into an aperture according to the target conversion coefficient to obtain a conversion nuclear magnetic resonance spectrum.

[0067] Optionally, the target conversion coefficient determination unit is specifically configured to:

[0068] Determining a candidate error based on at least two candidate conversion coefficients and the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve;

[0069] Determine the candidate conversion coefficient corresponding to the minimum value among the candidate errors as the target conversion coefficient;

[0070] Among them, the candidate error is used to characterize the degree of difference between a first reference value and a second reference value, the first reference value is the logarithmic difference between the transverse relaxation time in the nuclear magnetic resonance T2 spectrum and the candidate conversion coefficient, and the second reference value is the pore size logarithm value in the pore size distribution curve diagram.

[0071] Optionally, the occurrence aperture interval determination module 250 is specifically configured to:

[0072] determining a boundary line of the target fluid occurrence state according to the target position information;

[0073] The target occurrence pore size interval corresponding to the target fluid occurrence state is determined according to the dividing line.

[0074] Optionally, the fluid occurrence state determination module 220 is specifically configured to:

[0075] Determining a reference baseline according to the ratio of the longitudinal relaxation time to the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum;

[0076] The target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum are determined according to the reference baseline.

[0077] Optionally, the occurrence states of the target fluid include at least two of the following: pore water, bound water, adsorbed oil and free oil.

[0078] An apparatus for determining a pore size interval for fluid storage in an oil reservoir provided by an embodiment of the present invention can execute a method for determining a pore size interval for fluid storage in an oil reservoir provided by any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0079] Example 3

[0080] Figure 5 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0081] like Figure 5 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0082] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0083] Processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 executes the various methods and processes described above, such as the method for determining the pore size interval of fluid storage in an oil reservoir.

[0084] In some embodiments, the method for determining the pore size interval of fluid storage in the reservoir can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for determining the pore size interval of fluid storage in the reservoir described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the method for determining the pore size interval of fluid storage in the reservoir by any other appropriate means (for example, by means of firmware).

[0085] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0086] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0087] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0088] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0089] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0090] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0091] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0092] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for determining the pore size interval of fluid storage in an oil reservoir, characterized in that: The method comprises: Performing a nuclear magnetic resonance test on a target rock sample to obtain a two-dimensional nuclear magnetic resonance spectrum of the target rock sample; wherein the target rock sample is obtained based on the oil well to be tested; determining the target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum according to the two-dimensional nuclear magnetic resonance spectrum; Performing a mercury intrusion test on the target rock sample to obtain a pore size distribution curve of the target rock sample; According to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve, the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum is converted into pore size to obtain a conversion nuclear magnetic resonance spectrum; Determining a target occurrence pore size interval corresponding to the occurrence state of the target fluid according to the converted nuclear magnetic resonance spectrum and the target position information; According to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve, the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum is converted into the pore size to obtain a conversion nuclear magnetic resonance spectrum, including: Determining a target conversion coefficient based on the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve; Converting the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum into an aperture according to the target conversion coefficient to obtain a conversion nuclear magnetic resonance spectrum; Determining a target conversion coefficient according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve graph includes: Determining a candidate error based on at least two candidate conversion coefficients and the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve; Determine the candidate conversion coefficient corresponding to the minimum value among the candidate errors as the target conversion coefficient; The candidate error is used to characterize the degree of difference between a first reference value and a second reference value, the first reference value being the logarithmic difference between the transverse relaxation time in the nuclear magnetic resonance T2 spectrum and the candidate conversion coefficient, and the second reference value being the logarithmic value of the pore size in the pore size distribution curve graph; The target fluid occurrence states include at least two of the following: pore water, bound water, adsorbed oil and free oil.

2. The method according to claim 1, characterized in that Determining a target occurrence pore size interval corresponding to the occurrence state of the target fluid according to the converted nuclear magnetic resonance spectrum and the target position information includes: determining a boundary line of the target fluid occurrence state according to the target position information; The target occurrence pore size interval corresponding to the target fluid occurrence state is determined according to the dividing line.

3. The method according to claim 1, characterized in that Determining the target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum according to the two-dimensional nuclear magnetic resonance spectrum includes: Determining a reference baseline according to the ratio of the longitudinal relaxation time to the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum; The target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum are determined according to the reference baseline.

4. A device for determining the pore size interval of fluid occurrence in an oil reservoir, using the method for determining the pore size interval of fluid occurrence in an oil reservoir according to any one of claims 1 to 3, characterized in that: The device comprises: a two-dimensional nuclear magnetic resonance spectrum determination module, configured to perform a nuclear magnetic resonance test on a target rock sample to obtain a two-dimensional nuclear magnetic resonance spectrum of the target rock sample; wherein the target rock sample is obtained based on an oil well to be tested; a fluid occurrence state determination module, configured to determine the target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum based on the two-dimensional nuclear magnetic resonance spectrum; a pore size distribution curve diagram determination module, configured to perform a mercury intrusion test on the target rock sample to obtain a pore size distribution curve diagram of the target rock sample; a conversion nuclear magnetic resonance spectrum determination module, configured to convert the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum into the pore size to obtain a conversion nuclear magnetic resonance spectrum based on the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve; The occurrence pore size interval determination module is used to determine the target occurrence pore size interval corresponding to the occurrence state of the target fluid according to the converted nuclear magnetic resonance spectrum and the target position information.

5. The device according to claim 4, characterized in that The conversion nuclear magnetic resonance spectrum determination module includes: a target conversion coefficient determination unit, configured to determine a target conversion coefficient based on the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve; The conversion nuclear magnetic resonance spectrum determining unit is used to convert the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum into an aperture according to the target conversion coefficient to obtain a conversion nuclear magnetic resonance spectrum.

6. The device according to claim 5, characterized in that The target conversion coefficient determination unit is specifically configured to: Determining a candidate error based on at least two candidate conversion coefficients and the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve; Determine the candidate conversion coefficient corresponding to the minimum value among the candidate errors as the target conversion coefficient; Among them, the candidate error is used to characterize the degree of difference between a first reference value and a second reference value, the first reference value is the logarithmic difference between the transverse relaxation time in the nuclear magnetic resonance T2 spectrum and the candidate conversion coefficient, and the second reference value is the pore size logarithm value in the pore size distribution curve diagram.

7. The device according to claim 4, characterized in that The occurrence aperture interval determination module is specifically used to: determining a boundary line of the target fluid occurrence state according to the target position information; The target occurrence pore size interval corresponding to the target fluid occurrence state is determined according to the dividing line.

8. The device according to claim 4, characterized in that The fluid occurrence state determination module is specifically used to: Determining a reference baseline according to the ratio of the longitudinal relaxation time to the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum; The target fluid occurrence state of the target rock sample and target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum are determined according to the reference baseline.

9. The device according to claim 4, characterized in that The target fluid occurrence states include at least two of the following: pore water, bound water, adsorbed oil and free oil.

10. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the pore size interval of fluid storage in an oil reservoir according to any one of claims 1 to 3.

11. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the pore size interval of fluid storage in an oil reservoir according to any one of claims 1 to 3 when executed.

Images