Echo signal processing method and device, electronic equipment and storage medium

Abstract

The invention discloses an echo signal processing method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring a first echo signal in a CPMG pulse sequence of a full-diameter to-be-measured rock core; wherein the first echo signal is a head wave signal in a CPMG pulse sequence; when it is determined that the first echo signal is influenced by the stimulated echo, obtaining a stimulated echo correction factor; wherein the stimulated echo correction factor is a correction factor determined based on the simulation nuclear magnetic resonance signal response corresponding to the MAPS scanning image of the full-diameter sample core; the first echo signal is corrected based on the stimulated echo correction factor. According to the technical scheme provided by the embodiment of the invention, the first echo signal is corrected through the correction factor determined by the simulation nuclear magnetic resonance signal response corresponding to the MAPS scanning image of the full-diameter sample rock core, so that the influence of the stimulated echo on the first echo signal is reduced, and the quality of the first echo signal is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of petroleum exploration and well logging, and in particular to an echo signal processing method, device, electronic equipment and storage medium. Background Art

[0002] Full-diameter nuclear magnetic resonance core analysis technology is a new type of well site measurement technology. Since it is less affected by oil and gas loss and has high measurement data accuracy, the nuclear magnetic resonance information it uses is mainly obtained from the relaxation time T2, which is the result obtained after inversion of the original echo. The quality of the echo string directly affects the inversion accuracy of the T2 spectrum, and the first wave of the echo string is the most important signal affecting the quality of the echo string. Therefore, the quality of the first wave of the echo string is very important for full-diameter nuclear magnetic resonance core analysis.

[0003] In the prior art, stimulated echo correction is performed by performing echo fitting on the raw data of laboratory calibration box samples to improve the quality of the echo train. However, when performing echo curve fitting, the first two echoes are discarded, and the fitting curve determined from the third echo to the last echo is used as the fitting curve of the entire raw data. The first wave of the echo train obtained in this way still has a large error. Summary of the invention

[0004] The present invention provides an echo signal processing method, device, electronic device and storage medium, which corrects the first echo signal by using a correction factor determined by a simulated nuclear magnetic resonance signal response corresponding to a MAPS scanning image of a full-diameter sample core, thereby reducing the influence of the stimulated echo on the first echo signal and significantly improving the quality of the first echo signal.

[0005] According to one aspect of the present invention, there is provided an echo signal processing method, the method comprising:

[0006] Acquire the first echo signal in the CPMG pulse sequence of the full-diameter core to be measured; wherein the first echo signal is the first wave signal in the CPMG pulse sequence;

[0007] When it is determined that the first echo signal is affected by the stimulated echo, a stimulated echo correction factor is obtained; wherein the stimulated echo correction factor is a correction factor determined based on a simulated nuclear magnetic resonance signal response corresponding to a MAPS scanning image of a full-diameter sample core;

[0008] The first echo signal is corrected based on the stimulated echo correction factor.

[0009] According to another aspect of the present invention, there is provided an echo signal processing device, the device comprising:

[0010] An echo signal acquisition module is used to acquire the first echo signal in the CPMG pulse sequence of the full-diameter core to be measured; wherein the first echo signal is the first wave signal in the CPMG pulse sequence;

[0011] A correction factor acquisition module, when it is determined that the first echo signal is affected by the stimulated echo, acquires a stimulated echo correction factor; wherein the stimulated echo correction factor is a correction factor determined based on a simulated nuclear magnetic resonance signal response corresponding to a MAPS scanning image of a full-diameter sample core;

[0012] The echo signal correction module is used to correct the first echo signal based on the stimulated echo correction factor.

[0013] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0014] at least one processor; and

[0015] a memory communicatively connected to the at least one processor; wherein,

[0016] 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 echo signal processing method described in any embodiment of the present invention.

[0017] 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 echo signal processing method described in any embodiment of the present invention when executed.

[0018] The technical solution of the embodiment of the present invention is to obtain the first echo signal in the CPMG pulse sequence of the full-diameter core to be tested; wherein the first echo signal is the first wave signal in the CPMG pulse sequence; when it is determined that the first echo signal is affected by the stimulated echo, the stimulated echo correction factor is obtained; wherein the stimulated echo correction factor is a correction factor determined based on the simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image of the full-diameter sample core; the first echo signal is corrected based on the stimulated echo correction factor. The technical solution of the embodiment of the present invention is to correct the first echo signal by using the correction factor determined by the simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image of the full-diameter sample core, thereby reducing the influence of the stimulated echo on the first echo signal and significantly improving the quality of the first echo signal.

[0019] 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

[0020] 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.

[0021] Figure 1 is a flow chart of an echo signal processing method provided according to Embodiment 1 of the present invention;

[0022] Figure 2 is a flow chart of an echo signal processing method provided according to Embodiment 2 of the present invention;

[0023] Figure 3 is a schematic diagram of a target fitting curve provided according to the second embodiment of the present invention;

[0024] Figure 4 A relative error analysis diagram of a first echo signal and a target echo signal provided according to a second embodiment of the present invention;

[0025] Figure 5 A set of MAPS scan images provided according to the second embodiment of the present invention;

[0026] Figure 6 A schematic diagram of a random walk algorithm simulation provided according to the second embodiment of the present invention;

[0027] Figure 7 A schematic diagram of simulation results of a random walk algorithm provided according to the second embodiment of the present invention;

[0028] Figure 8 A schematic diagram of a corrected echo signal provided according to the second embodiment of the present invention;

[0029] Fig. 9 A schematic diagram of the structure of an echo signal processing device provided according to a third embodiment of the present invention;

[0030] Fig.10 It is a schematic diagram of the structure of an electronic device for implementing the echo signal processing method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] 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.

[0032] It should be noted that the terms "first", "second", 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 that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] Embodiment 1

[0034] Figure 1 A flowchart of an echo signal processing method is provided for the first embodiment of the present invention. This embodiment is applicable to the case of processing echo signals. The method can be executed by an echo signal processing device. The echo signal processing device can be implemented in the form of hardware and / or software. The echo signal processing device can be configured in an electronic device. Figure 1 As shown, the method includes:

[0035] S110, obtaining the first echo signal in the CPMG pulse sequence of the full-diameter core to be measured; wherein the first echo signal is the first wave signal in the CPMG pulse sequence.

[0036] Among them, the full-diameter core to be tested refers to the complete rock sample obtained during geological exploration and oil development. Its diameter is the same as the borehole diameter, which is very important for understanding the physical properties, rock composition and reservoir properties of underground rocks.

[0037] Among them, the CPMG pulse sequence is a pulse sequence commonly used in nuclear magnetic resonance experiments, and CPMG stands for Carr-Purcell-Meiboom-Gill. In the full-diameter nuclear magnetic resonance acquisition mode, the CPMG pulse sequence is mainly used to obtain the transverse relaxation time T2 distribution. Its main steps are: ensure that the sample is fully magnetized for a long time, use a 90-degree pulse to turn the magnetization vector in the Z direction to the XY plane, apply a series of 180-degree pulses, obtain echo signals between two adjacent 180-degree pulses, and form all signals into echo train signals for inversion processing to obtain T2 distribution. In an embodiment of the present invention, the first echo signal is the first wave signal in the CPMG pulse sequence.

[0038] Specifically, the first echo signal in the CPMG pulse sequence of the full-diameter core to be tested can be acquired by collecting the first wave signal in the CPMG pulse sequence through a mobile well site full-diameter nuclear magnetic resonance core analysis instrument.

[0039] S120. When it is determined that the first echo signal is affected by the stimulated echo, a stimulated echo correction factor is obtained; wherein the stimulated echo correction factor is a correction factor determined based on a simulated nuclear magnetic resonance signal response corresponding to a MAPS scanning image of a full-diameter sample core.

[0040] Among them, in the CPMG pulse sequence, stimulated echo refers to a series of echo signals generated after the inversion pulse sequence. These echo signals are generated due to the phase evolution of the spin system during the inversion pulse interval and usually affect the first echo signal.

[0041] Among them, MAPS (Multiple Acquisition with Phase Sensitivity) scanning is a magnetic resonance imaging technology used to obtain images with high spatial resolution and rich contrast. MAPS scanning images can provide detailed and accurate structural information.

[0042] Specifically, when it is determined that the first echo signal is affected by the stimulated echo, the stimulated echo correction factor can be determined based on the simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image of the full-diameter sample core to correct the first echo signal and reduce the impact of the stimulated echo on the first echo signal.

[0043] S130. Correct the first echo signal based on the stimulated echo correction factor.

[0044] In the embodiment of the present invention, after the stimulated echo correction factor is determined, the first echo signal can be corrected based on the stimulated echo correction factor to improve the quality of the first echo signal, thereby improving the accuracy of full-diameter nuclear magnetic resonance core analysis.

[0045] The technical solution of the embodiment of the present invention is to obtain the first echo signal in the CPMG pulse sequence of the full-diameter core to be tested; wherein the first echo signal is the first wave signal in the CPMG pulse sequence; when it is determined that the first echo signal is affected by the stimulated echo, the stimulated echo correction factor is obtained; wherein the stimulated echo correction factor is a correction factor determined based on the simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image of the full-diameter sample core; the first echo signal is corrected based on the stimulated echo correction factor. The technical solution of the embodiment of the present invention is to correct the first echo signal by using the correction factor determined by the simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image of the full-diameter sample core, thereby reducing the influence of the stimulated echo on the first echo signal and significantly improving the quality of the first echo signal.

[0046] Embodiment 2

[0047] Figure 2 This is a flowchart of an echo signal processing method provided by Embodiment 2 of the present invention. The embodiment of the present invention is optimized based on the above embodiment. For solutions not described in detail in the embodiment of the present invention, please refer to the above embodiment. Figure 2 As shown, the method includes:

[0048] S210, obtaining the first echo signal in the CPMG pulse sequence of the full-diameter core to be measured; wherein the first echo signal is the first wave signal in the CPMG pulse sequence.

[0049] S220: Determine whether the first echo signal is affected by the stimulated echo.

[0050] It is understandable that the first echo signal needs to be corrected only when the first echo signal is affected by the stimulated echo. Therefore, before determining the stimulated echo correction factor, it is necessary to first determine whether the first echo signal is affected by the stimulated echo.

[0051] Specifically, determining whether the first echo signal is affected by the stimulated echo includes: extracting the first N echo signals in the CPMG pulse sequence; wherein the first N echo signals include the first echo signal and N-1 second echo signals, and the second echo signal is an echo signal other than the first echo signal; performing curve fitting on the N echo signals to generate a target fitting curve; determining the target echo signal corresponding to the sampling moment of the first echo signal from the target fitting curve; calculating the echo signal difference between the first echo signal and the target echo signal; when the ratio of the echo signal difference to the target echo signal is greater than a preset error threshold, determining that the first echo signal is affected by the stimulated echo.

[0052] Among them, the target echo signal is the theoretical value of the first echo signal in the target fitting curve, and the ratio of the echo signal difference to the target echo signal is the relative error between the first echo signal and the target echo signal. When the ratio of the echo signal difference to the target echo signal is greater than the preset error threshold, it means that the relative error between the first echo signal and the target echo signal is large, and it is determined that the first echo signal is affected by the stimulated echo. It can be understood that the size of the preset error threshold can be set according to actual conditions.

[0053] For example, Figure 3 A schematic diagram of a target fitting curve is shown, such as Figure 3 As shown, the Y-axis Amplitude represents the amplitude of the echo signal, and the X-axis represents the acquisition time. The target fitting curve is obtained by extracting the first 8 echo signals in the CPMG pulse sequence, using the acquisition time and the 8 echo signals, and adopting power exponential fitting. Figure 4 A relative error analysis diagram of the first echo signal and the target echo signal is shown, such as Figure 4 As shown, the Y axis is the signal strength and the X axis is the acquisition time. It can be seen from the figure that the first echo signal obviously deviates from the target fitting curve, and the ratio of the echo signal difference to the target echo signal is calculated, that is, the relative error is 12%, which is greater than the preset error threshold of 5%. At this time, it can be determined that the first echo signal is affected by the stimulated echo.

[0054] It should be noted that when the ratio of the echo signal difference to the target echo signal is less than the preset error threshold, it means that the relative error between the first echo signal and the target echo signal is small, and it is determined that the first echo signal is not affected by the stimulated echo. At this time, there is no need to correct the first echo signal.

[0055] S230, obtaining a MAPS scanning image of the full-diameter sample core, and obtaining a simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image.

[0056] In an embodiment of the present invention, a MAPS scanning measurement can be performed on a full-diameter sample core, and the scanning data can be binarized to obtain a MAPS scanning image of the full-diameter sample core, and a simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image can be obtained based on the structural information provided by the MAPS scanning image.

[0057] Specifically, obtaining a simulated nuclear magnetic resonance signal response corresponding to a MAPS scanning image includes: extracting a pore structure from the MAPS scanning image; and obtaining a simulated nuclear magnetic resonance signal response corresponding to the pore structure using a random walk algorithm.

[0058] Among them, the random walk method is a simulation algorithm based on randomness, which is often used to simulate or predict random processes. The calculation steps of this algorithm are:

[0059] 1. Randomly distribute a fixed number of walkers (protons) in the pores of the rock;

[0060] 2. Calculate the distance d between the proton and the nearest solid surface. When d < 3ε, use the traditional method, and the diffusion radius r = ε; when d > 3ε, use the first travel time method, and the diffusion radius r = d; where ε is the diffusion radius of the traditional method;

[0061] 3. Calculate the time interval Δt and the position of the proton at the next moment;

[0062] 4. Determine whether the proton collides with the solid surface:

[0063] ① The proton dies with a probability of δ. If the proton does not die, it will rebound;

[0064] ② The proton magnetization decays at (1-δ) or exp(-δ) and rebounds; this processing method is relatively slow compared to the previous method, and the simulation results are relatively smooth, but the error between the simulation results of the two methods can be ignored. The calculation formula of probability δ is: δ=(2ρr) / (3D), where ρ is the surface relaxation rate, r is the proton diffusion radius, and D is the fluid diffusion coefficient;

[0065] 5. Determine whether the proton has left the rock. If the proton has left the rock, the next position of the proton is a randomly selected pore position on the opposite side of the rock.

[0066] 6. Calculate the proton phase shift φ using the following formula:

[0067] Where Normal() is a Gaussian random number. When t = (n + 1 / 2)TE, the phase is reversed φ(t) = -φ(t) to meet the CPMG pulse sequence acquisition requirements;

[0068] 7. When t=nTE, record the diffusion magnetization intensity (phase cosine) and surface magnetization intensity of the protons to obtain the sum of the proton magnetization decay signals, and repeat steps (2) to (6) until the sampling time is greater than the set threshold.

[0069] For example, Figure 5 A set of MAPS scanning images is shown, wherein the left side is a binarized MAPS scanning image, the middle is an extracted pore structure image, and the right side is a binarized pore structure image. Figure 6 A schematic diagram of a random walk algorithm simulation is shown, simulating the movement path of protons in rock cracks. Figure 7 A schematic diagram of simulation results of a random walk algorithm is shown, in which the Y-axis represents signal intensity and the X-axis represents acquisition time.

[0070] S240, extracting the first M simulated echo signals from the simulated nuclear magnetic resonance signal response.

[0071] Among them, the first M simulated echo signals include a first simulated echo signal and M-1 second simulated echo signals, the first simulated echo signal is the first wave signal in the simulated nuclear magnetic resonance signal response, and the second simulated echo signal is the echo signal other than the first simulated echo signal in the simulated nuclear magnetic resonance signal response. In an embodiment of the present invention, after obtaining the simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image, the first M simulated echo signals can be extracted from the simulated nuclear magnetic resonance signal response. It can be understood that the number of simulated echo signals extracted here can be set according to actual conditions. Exemplarily, the first 8 simulated echo signals can be extracted from the simulated nuclear magnetic resonance signal response.

[0072] S250 . Determine a stimulated echo correction factor according to the M simulated echo signals.

[0073] In the embodiment of the present invention, after extracting the first M simulated echo signals from the simulated nuclear magnetic resonance signal response, the stimulated echo correction factor can be determined according to the M simulated echo signals.

[0074] Specifically, the stimulated echo correction factor is determined according to M simulated echo signals, including: performing curve fitting on the M simulated echo signals to generate a simulated fitting curve; determining a target simulated echo signal corresponding to a sampling moment of the first simulated echo signal from the simulated fitting curve; and taking the ratio of the first simulated echo signal to the target simulated echo signal as the stimulated echo correction factor.

[0075] The target simulated echo signal is the theoretical value of the first simulated echo signal in the simulated fitting curve, and the ratio of the first simulated echo signal to the target simulated echo signal can be used as a stimulated echo correction factor to correct the first echo signal.

[0076] Exemplarily, curve fitting is performed on the first eight simulated echo signals to generate a simulated fitting curve, and the ratio of the first simulated echo signal to the target simulated echo signal is calculated, and the ratio is used as a stimulated echo correction factor to correct the first echo signal.

[0077] S260: Correct the first echo signal based on the stimulated echo correction factor.

[0078] In the embodiment of the present invention, after the stimulated echo correction factor is determined, the first echo signal may be corrected based on the stimulated echo correction factor.

[0079] Specifically, correcting the first echo signal based on the stimulated echo correction factor includes: calculating the product of the target echo signal and the stimulated echo correction factor, and using the product as the echo signal after the first echo signal is corrected.

[0080] The target echo signal is the theoretical value of the first echo signal in the target fitting curve. The target echo signal is multiplied by the stimulated echo correction factor, and the product is used as the echo signal after the correction of the first echo signal. In this way, the influence of the stimulated echo on the first echo signal can be reduced, the quality of the first echo signal can be improved, and the accuracy of the full-diameter NMR core analysis can be improved.

[0081] For example, Figure 8 A schematic diagram of a corrected echo signal is shown, in which the Y axis is the signal intensity and the X axis is the acquisition time. It can be seen from the figure that the first echo signal has basically not deviated from the fitting curve, indicating that the quality of the corrected first echo signal is good. Table 1 below shows the comparison between the porosity calculation results and the core analysis results before and after correction. It can be seen from the correction results of the 14 core samples in Table 1 that the calculation error of the porosity before correction is 11.7%, which cannot meet the error requirement of 8% for reserve calculation. However, the calculation error of the porosity after correction is only 0.6%, and the accuracy of porosity calculation is significantly improved.

[0082] Table 1 Comparison of porosity calculation results and core analysis results before and after correction

[0083]

[0084]

[0085] The technical solution of the embodiment of the present invention is to obtain the first echo signal in the CPMG pulse sequence of the full-diameter core to be tested; wherein the first echo signal is the first wave signal in the CPMG pulse sequence; determine the influence of the stimulated echo on the first echo signal; obtain the MAPS scanning image of the full-diameter sample core, and obtain the simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image; extract the first M simulated echo signals from the simulated nuclear magnetic resonance signal response; determine the stimulated echo correction factor according to the M simulated echo signals; and correct the first echo signal based on the stimulated echo correction factor. The technical solution of the embodiment of the present invention is to correct the first echo signal by using the correction factor determined by the simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image of the full-diameter sample core, thereby reducing the influence of the stimulated echo on the first echo signal and significantly improving the quality of the first echo signal.

[0086] Embodiment 3

[0087] Fig. 9 A schematic diagram of the structure of an echo signal processing device provided in Embodiment 3 of the present invention.

[0088] like Fig. 9 As shown, the device comprises:

[0089] The echo signal acquisition module 310 is used to acquire the first echo signal in the CPMG pulse sequence of the full-diameter core to be measured; wherein the first echo signal is the first wave signal in the CPMG pulse sequence;

[0090] The correction factor acquisition module 320 acquires a stimulated echo correction factor when it is determined that the first echo signal is affected by the stimulated echo; wherein the stimulated echo correction factor is a correction factor determined based on a simulated nuclear magnetic resonance signal response corresponding to a MAPS scanning image of a full-diameter sample core;

[0091] The echo signal correction module 330 is configured to correct the first echo signal based on the stimulated echo correction factor.

[0092] Optionally, the correction factor acquisition module 320 includes:

[0093] An echo signal extraction unit, used for extracting the first N echo signals in the CPMG pulse sequence; wherein the first N echo signals include a first echo signal and N-1 second echo signals, and the second echo signal is an echo signal other than the first echo signal;

[0094] A target fitting curve generating unit, used for performing curve fitting on the N echo signals to generate a target fitting curve;

[0095] a target echo signal determining unit, configured to determine a target echo signal corresponding to a sampling moment of the first echo signal from the target fitting curve;

[0096] an echo signal difference calculation unit, used for calculating an echo signal difference between the first echo signal and the target echo signal;

[0097] The first influence determining unit is configured to determine that the first echo signal is influenced by a stimulated echo when a ratio of the echo signal difference to the target echo signal is greater than a preset error threshold.

[0098] Optionally, the echo signal correction module 330 includes:

[0099] The echo signal correction unit is used to calculate the product of the target echo signal and the stimulated echo correction factor, and use the product as the echo signal after the first echo signal is corrected.

[0100] Optionally, the correction factor acquisition module 320 further includes:

[0101] The second influence determination unit is configured to determine that the first echo signal is not influenced by the stimulated echo when the ratio of the echo signal difference to the target echo signal is less than the preset error threshold.

[0102] Optionally, the correction factor acquisition module 320 includes:

[0103] A simulated signal response acquisition unit, used to acquire a MAPS scanning image of a full-diameter sample core, and to acquire a simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image;

[0104] A simulated echo signal extraction unit, used to extract the first M simulated echo signals from the simulated nuclear magnetic resonance signal response; wherein the first M simulated echo signals include a first simulated echo signal and M-1 second simulated echo signals, the first simulated echo signal is a first wave signal in the simulated nuclear magnetic resonance signal response, and the second simulated echo signal is an echo signal in the simulated nuclear magnetic resonance signal response except the first simulated echo signal;

[0105] A correction factor determination unit is used to determine the stimulated echo correction factor according to the M simulated echo signals.

[0106] Optionally, the correction factor determination unit includes:

[0107] A simulation fitting curve generating subunit, used for performing curve fitting on the M simulation echo signals to generate a simulation fitting curve;

[0108] a target simulated echo signal determining subunit, configured to determine a target simulated echo signal corresponding to a sampling moment of the first simulated echo signal from the simulated fitting curve;

[0109] The correction factor determination subunit is used to use the ratio of the first simulated echo signal to the target simulated echo signal as the stimulated echo correction factor.

[0110] Optionally, the analog signal response acquisition unit includes:

[0111] A pore structure extraction subunit, used for extracting pore structure from the MAPS scanning image;

[0112] The simulated signal response acquisition subunit is used to obtain the simulated nuclear magnetic resonance signal response corresponding to the pore structure by using a random walk algorithm for the pore structure.

[0113] The echo signal processing device provided in the embodiment of the present invention can execute the echo signal processing method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0114] Embodiment 4

[0115] Fig.10 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.

[0116] like Fig.10 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.

[0117] 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.

[0118] 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 performs the various methods and processes described above, such as the echo signal processing method.

[0119] In some embodiments, the echo signal processing method may 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 may 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 echo signal processing method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the echo signal processing method in any other appropriate manner (e.g., by means of firmware).

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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).

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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 processing an echo signal, characterized in that: include: Acquire the first echo signal in the CPMG pulse sequence of the full-diameter core to be measured; wherein the first echo signal is the first wave signal in the CPMG pulse sequence; When it is determined that the first echo signal is affected by the stimulated echo, a stimulated echo correction factor is obtained; wherein the stimulated echo correction factor is a correction factor determined based on a simulated nuclear magnetic resonance signal response corresponding to a MAPS scanning image of a full-diameter sample core; The first echo signal is corrected based on the stimulated echo correction factor.

2. The method according to claim 1, characterized in that Determining that the first echo signal is affected by the stimulated echo includes: Extracting the first N echo signals in the CPMG pulse sequence; wherein the first N echo signals include a first echo signal and N-1 second echo signals, and the second echo signal is an echo signal other than the first echo signal; Performing curve fitting on the N echo signals to generate a target fitting curve; Determine a target echo signal corresponding to a sampling time of the first echo signal from the target fitting curve; Calculating an echo signal difference between the first echo signal and the target echo signal; When the ratio of the echo signal difference to the target echo signal is greater than a preset error threshold, it is determined that the first echo signal is affected by a stimulated echo.

3. The method according to claim 2, characterized in that Correcting the first echo signal based on the stimulated echo correction factor includes: The product of the target echo signal and the stimulated echo correction factor is calculated, and the product is used as the echo signal after the first echo signal is corrected.

4. The method according to claim 2, characterized in that: Also includes: When the ratio of the echo signal difference to the target echo signal is less than the preset error threshold, it is determined that the first echo signal is not affected by the stimulated echo.

5. The method according to claim 1, characterized in that Get stimulated echo correction factors, including: Obtaining a MAPS scanning image of a full-diameter sample core, and obtaining a simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image; Extracting the first M simulated echo signals from the simulated nuclear magnetic resonance signal response; wherein the first M simulated echo signals include a first simulated echo signal and M-1 second simulated echo signals, the first simulated echo signal is a first wave signal in the simulated nuclear magnetic resonance signal response, and the second simulated echo signal is an echo signal in the simulated nuclear magnetic resonance signal response except the first simulated echo signal; The stimulated echo correction factor is determined according to the M simulated echo signals.

6. The method according to claim 5, characterized in that Determining the stimulated echo correction factor according to the M simulated echo signals includes: Performing curve fitting on the M simulated echo signals to generate a simulated fitting curve; Determining a target simulated echo signal corresponding to a sampling time of the first simulated echo signal from the simulated fitting curve; The ratio of the first simulated echo signal to the target simulated echo signal is used as the stimulated echo correction factor.

7. The method according to claim 5, characterized in that Acquiring a simulated nuclear magnetic resonance signal response corresponding to the MAPS scanning image, comprising: extracting pore structure from the MAPS scan image; With respect to the pore structure, a random walk algorithm is used to obtain a simulated nuclear magnetic resonance signal response corresponding to the pore structure.

8. An echo signal processing device, characterized in that: include: An echo signal acquisition module is used to acquire the first echo signal in the CPMG pulse sequence of the full-diameter core to be measured; wherein the first echo signal is the first wave signal in the CPMG pulse sequence; A correction factor acquisition module, when it is determined that the first echo signal is affected by the stimulated echo, acquires a stimulated echo correction factor; wherein the stimulated echo correction factor is a correction factor determined based on a simulated nuclear magnetic resonance signal response corresponding to a MAPS scanning image of a full-diameter sample core; The echo signal correction module is used to correct the first echo signal based on the stimulated echo correction factor.

9. 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 perform the echo signal processing method according to any one of claims 1 to 7.

10. 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 echo signal processing method according to any one of claims 1 to 7 when executed.

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