Method, device and equipment for determining occurrence aperture interval of fluid in oil reservoir and medium

Abstract

The embodiment of the invention discloses a method, device and equipment for determining a fluid occurrence aperture interval in an oil reservoir and a medium. The method comprises the following steps: 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; according to the two-dimensional nuclear magnetic resonance spectrum, determining a 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; performing mercury injection test on the target rock sample to obtain a pore size distribution curve graph of the target rock sample; according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve graph, transversal relaxation time in the two-dimensional nuclear magnetic resonance spectrum is converted into pore size to obtain a converted nuclear magnetic resonance spectrum; and determining a target occurrence aperture interval corresponding to the target fluid occurrence state according to the converted nuclear magnetic resonance spectrum and the target position information. According to the technical scheme, a nuclear magnetic resonance-mercury injection combined testing mode is adopted, and the pore diameter interval of fluid occurrence in the oil reservoir can be accurately determined 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 of the fluid in the reservoir in the rock is one of the key factors that restrict the effective development of the fluid in the reservoir. In related technologies, nitrogen adsorption experiments are carried out on original samples, samples after dehydration and activation, samples after pentane extraction, and samples after dichloromethane extraction. Based on the characteristics of the pore structure changes of samples before and after different treatment methods, the pore size range of different fluids is determined. However, due to the limited pore size range that can be measured by nitrogen adsorption, the measurement results are biased. 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, adopts a nuclear magnetic resonance-mercury injection joint 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 of 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 an 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 injection 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 the 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 conversion 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 is used 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, used 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 according to the two-dimensional nuclear magnetic resonance spectrum;

[0013] A pore size distribution curve diagram determination module is used to perform a mercury injection 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 is used 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 according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve diagram;

[0015] The occurrence aperture interval determination module is used to determine the target occurrence aperture 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, the electronic device 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 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 the 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 according to 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; according to 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 the pore size to obtain a conversion nuclear magnetic resonance spectrum; according to the conversion nuclear magnetic resonance spectrum and the target position information, the target occurrence pore size interval corresponding to the target fluid occurrence state is determined. This technical solution adopts a combined test method of nuclear magnetic resonance-mercury injection, and can accurately determine the pore size interval of fluid occurrence in the reservoir through parameter conversion.

[0022] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily 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 of fluid storage in an oil reservoir provided according to Embodiment 1 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 Embodiment 1 of the present invention;

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

[0028] Figure 5 It is a structural schematic diagram of an electronic device for implementing a method for determining a fluid storage pore size interval 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 scheme of the present invention, the technical scheme 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 described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 specification 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 data 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] Embodiment 1

[0032] Figure 1 This is a flow chart of a method for determining the pore size interval of fluid storage 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 storage in an oil reservoir. The method can be executed by a device for determining the pore size interval of fluid storage in an oil reservoir. The device for determining the pore size interval of fluid storage 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 storage 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 an 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. Exemplarily, 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 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 fluid in the rock sample may include oil and water. Optionally, the target fluid occurrence state includes 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 position of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum.

[0038] In this embodiment, after obtaining the two-dimensional nuclear magnetic resonance spectrum of the target rock sample, 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 can be determined according to the two-dimensional nuclear magnetic resonance spectrum. Optionally, 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 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; 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 according to 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] The two oblique dotted lines are reference lines, representing T1 / T2 = 10 and T1 / T2 = 1, respectively. Based on the location charts of different fluid occurrence states provided in related research (2D NMR response characteristics of Jimusar shale oil reservoir) and combined with actual test experience, 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 There are four enclosed areas in Figure 3 For example, the target position information of the four target fluid occurrence states in the two-dimensional nuclear magnetic resonance spectrum can be seen in Table 1:

[0041] Table 1 Target position information of four target fluid occurrence states in 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 injection 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 the pore size distribution curve of the target rock sample can be determined based on the corresponding relationship.

[0045] S140, according to 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 the pore size to obtain a conversion 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 the pore size to obtain the conversion nuclear magnetic resonance spectrum according to the nuclear magnetic resonance T2 spectrum and the pore size distribution curve of the target rock sample. 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 the pore size to obtain the conversion nuclear magnetic resonance spectrum, including: determining a target conversion coefficient according to the nuclear magnetic resonance T2 spectrum and the pore size distribution curve of the target rock sample; converting the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum into the pore size according to the target conversion coefficient to obtain the conversion nuclear magnetic resonance spectrum.

[0047] Among them, the target conversion coefficient can be used to convert the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum into the aperture. In this embodiment, the target conversion coefficient is first determined according to the nuclear magnetic resonance T2 spectrum and the aperture distribution curve of the target rock sample. Optionally, the target conversion coefficient is determined according to the nuclear magnetic resonance T2 spectrum and the aperture distribution curve of the target rock sample, including: based on at least two candidate conversion coefficients, determining the candidate error according to the nuclear magnetic resonance T2 spectrum and the aperture distribution curve of the target rock sample; determining the candidate conversion coefficient corresponding to the minimum value in the candidate error 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 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 logarithmic value of the aperture in the aperture distribution curve.

[0048] Exemplarily, 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 can obtain lgT2=lgC+lgr, that is, lgT2-lgC=lgr. Among them, lg represents taking the logarithm, lgT2-lgC represents the first reference value, and lgr represents the second reference value. Under different candidate conversion coefficients, the error calculation of lgT2-lgC and lgr is performed to obtain the corresponding candidate error. Find the minimum value from all candidate errors, and determine the candidate conversion coefficient corresponding to the minimum value as the target conversion coefficient.

[0049] After determining the target conversion coefficient, the transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum can be converted into an aperture according to the target conversion coefficient, thereby obtaining a conversion nuclear magnetic resonance spectrum. Specifically, the 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 nuclear magnetic resonance spectrum, the target occurrence aperture interval corresponding to the occurrence state of the target fluid can be determined according to the conversion nuclear magnetic resonance spectrum and the target position information. Optionally, determining the target occurrence aperture interval corresponding to the occurrence state of the target fluid according to the conversion nuclear magnetic resonance spectrum and the target position information includes: determining a boundary line of the occurrence state of the target fluid according to the target position information; and determining the target occurrence aperture interval corresponding to the occurrence state of the target fluid according to the boundary line.

[0052] like Figure 3 As shown, the two vertical dashed lines represent the dividing lines, which can be determined according to the boundary positions of different target fluid occurrence states. 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 storage pore size interval is <25nm; the pore size interval in the middle is mesopores, and the corresponding target storage pore size interval is 25nm-1000nm; the pore size interval on the right is macropores, and the corresponding target storage 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 Mesopore (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 <25nm. 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 the 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 according to 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; according to 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 the pore size to obtain a conversion nuclear magnetic resonance spectrum; according to the conversion nuclear magnetic resonance spectrum and the target position information, the target occurrence pore size interval corresponding to the target fluid occurrence state is determined. This technical solution adopts a combined test method of nuclear magnetic resonance-mercury injection, and can accurately determine the pore size interval of fluid occurrence in the reservoir through parameter conversion.

[0057] Embodiment 2

[0058] Figure 4 This is a schematic diagram of the structure of a device for determining the pore size interval of fluid storage in an oil reservoir provided in the second embodiment of the present invention. The device can execute the method for determining the pore size interval of fluid storage in an oil reservoir provided in 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 comprises:

[0059] A two-dimensional nuclear magnetic resonance spectrum determination module 210 is used 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, 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 according to the two-dimensional nuclear magnetic resonance spectrum;

[0061] A pore size distribution curve diagram determination module 230 is used to perform a mercury injection 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 is used to convert the transverse relaxation time in the two-dimensional NMR spectrum into the pore size to obtain a conversion NMR spectrum according to the NMR T2 spectrum of the target rock sample and the pore size distribution curve diagram;

[0063] The occurrence aperture interval determination module 250 is used to determine the target occurrence aperture 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 conversion nuclear magnetic resonance spectrum determination module 240 includes:

[0065] A target conversion coefficient determination unit, used to determine the target conversion coefficient according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve diagram;

[0066] The conversion nuclear magnetic resonance spectrum determination 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 used to:

[0068] Based on at least two candidate conversion coefficients, determining a candidate error according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve graph;

[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 logarithmic 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 occurrence state of the target fluid is determined according to the dividing line.

[0074] Optionally, the fluid occurrence state determination module 220 is specifically used 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 the 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 target fluid occurrence states include at least two of the following: pore water, bound water, adsorbed oil and free oil.

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

[0079] Embodiment 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 required herein.

[0081] like Figure 5 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and 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 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0082] A number of 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 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 through a computer network such as the Internet and / or various telecommunication networks.

[0083] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a method for determining a 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 a 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 implementations of the systems and techniques described above 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), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including 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, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0087] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may 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.

[0088] To provide interaction with a user, the systems and techniques described herein may 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 a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0089] The systems and techniques described herein may be implemented in a computing system that includes backend 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 frontend components (e.g., a user computer with a graphical user interface or a 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 backend components, middleware components, or frontend components. The components of the system may 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 a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0091] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0092] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope 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 an 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 injection 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 the pore size to obtain a conversion nuclear magnetic resonance spectrum; A target occurrence pore size interval corresponding to the occurrence state of the target fluid is determined according to the conversion nuclear magnetic resonance spectrum and the target position information.

2. The method according to claim 1, characterized in that 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: Determine a target conversion coefficient according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve diagram; The transverse relaxation time in the two-dimensional nuclear magnetic resonance spectrum is converted into an aperture according to the target conversion coefficient to obtain a conversion nuclear magnetic resonance spectrum.

3. The method according to claim 2, characterized in that Determining a target conversion coefficient according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve diagram includes: Based on at least two candidate conversion coefficients, determining a candidate error according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve graph; 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 logarithmic value in the pore size distribution curve diagram.

4. 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 conversion 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 occurrence state of the target fluid is determined according to the dividing line.

5. 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 the target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum are determined according to the reference baseline.

6. The method according to claim 1, characterized in that The target fluid occurrence states include at least two of the following: pore water, bound water, adsorbed oil and free oil.

7. A device for determining the pore size interval of fluid storage in an oil reservoir, characterized in that: The device comprises: A two-dimensional nuclear magnetic resonance spectrum determination module is used 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, used 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 according to the two-dimensional nuclear magnetic resonance spectrum; A pore size distribution curve diagram determination module is used to perform a mercury injection 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 is used 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 according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve diagram; The occurrence aperture interval determination module is used to determine the target occurrence aperture interval corresponding to the occurrence state of the target fluid according to the converted nuclear magnetic resonance spectrum and the target position information.

8. The device according to claim 7, characterized in that The conversion nuclear magnetic resonance spectrum determination module comprises: A target conversion coefficient determination unit, used to determine the target conversion coefficient according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve diagram; The conversion nuclear magnetic resonance spectrum determination 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.

9. The device according to claim 8, characterized in that The target conversion coefficient determination unit is specifically used to: Based on at least two candidate conversion coefficients, determining a candidate error according to the nuclear magnetic resonance T2 spectrum of the target rock sample and the pore size distribution curve graph; 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 logarithmic value in the pore size distribution curve diagram.

10. The device according to claim 7, characterized in that The module for determining the occurrence aperture interval is specifically used for: 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 occurrence state of the target fluid is determined according to the dividing line.

11. The device according to claim 7, characterized in that The fluid occurrence state determination module is specifically used for: 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 the target position information of the target fluid occurrence state in the two-dimensional nuclear magnetic resonance spectrum are determined according to the reference baseline.

12. The device according to claim 7, characterized in that The target fluid occurrence states include at least two of the following: pore water, bound water, adsorbed oil and free oil.

13. 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 as described in any one of claims 1-6.

14. 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 6 when executed.

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