A neutron logging method, system, and electronic device for measuring formation porosity

Abstract

The present application relates to the technical field of neutron logging, and particularly relates to a neutron logging method, system and electronic equipment for measuring formation porosity, the method comprising: when a target formation of a well to be measured is a high-porosity formation, substituting a thermal neutron count ratio of the target formation and formation density of the target formation into a high-formation porosity model to obtain formation porosity of the target formation; when the target formation of the well to be measured is a low-porosity formation, substituting the thermal neutron count ratio of the target formation and the formation density of the target formation into a low-formation porosity model to obtain formation porosity of the target formation. Compared with the prior art, the present application starts from neutron transport theory, fully considers the influence of non-elastic scattering of neutrons on neutron moderation, and finally improves the accuracy and sensitivity of porosity measurement of the target formation. Moreover, the instruments used in the method are common instruments and equipment in the field, which are convenient to operate, implement and test.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of neutron logging, in particular to a neutron logging method, system and electronic equipment for measuring formation porosity. BACKGROUND

[0002] Formation porosity measurement is a very important part of open hole logging. In traditional porosity measurement, Am-Be isotope chemical source is used as a radioactive source. However, this method has the following disadvantages: on the one hand, the radioactive source needs to be manually added and unloaded before and after logging, which is harmful to the operators; on the other hand, there is a risk of downhole source sticking when using chemical source logging, and once the fishing fails, it will cause radiation hazards to the environment.

[0003] With the development of controllable neutron source technology and environmental protection requirements, more and more oil companies and related researchers have begun to study the use of controllable neutron sources for formation porosity measurement. However, the high-energy neutrons emitted by the controllable neutron source not only have elastic scattering but also have inelastic scattering in the formation. This makes the slowing-down length much longer than when using chemical sources, reducing the accuracy and sensitivity of the near and far detectors to porosity, and affecting its application in oil and gas exploration and development. Therefore, when using controllable neutron sources for porosity logging, it is necessary to consider improving the accuracy and sensitivity of porosity measurement. SUMMARY

[0004] The present application solves the technical problems of the prior art and provides a neutron logging method, system and electronic equipment for measuring formation porosity.

[0005] The technical scheme of the neutron logging method for measuring formation porosity of the present application is as follows:

[0006] When the target formation of the well to be measured is a high-porosity formation, the thermal neutron count ratio of the target formation and the formation density of the target formation are substituted into the high-formation porosity model to obtain the formation porosity of the target formation.

[0007] When the target formation of the well to be measured is a low-porosity formation, the thermal neutron count ratio of the target formation and the formation density of the target formation are substituted into the low-formation porosity model to obtain the formation porosity of the target formation.

[0008] The neutron logging method for measuring formation porosity of the present application has the following beneficial effects:

[0009] Compared with the prior art, the present application starts from neutron transport theory, fully considers the influence of non-elastic scattering of neutrons on neutron moderation, uses a high formation porosity model to calculate the formation porosity when the target formation of the well to be measured is a high porosity formation, uses a low formation porosity model to calculate the formation porosity when the target formation of the well to be measured is a low porosity formation, and finally improves the accuracy and sensitivity of the porosity measurement of the target formation.

[0010] On the basis of the above scheme, the neutron logging method for measuring formation porosity of the present application can be further improved as follows.

[0011] Further, the high formation porosity model is: wherein, φ represents the formation porosity, R t is the thermal neutron count ratio, ρ is the formation density, and A, B, C, D, E, F, G and H are scale coefficients.

[0012] Further, the low formation porosity model is: wherein, φ represents the formation porosity, R t is the thermal neutron count ratio, M, N, O, P, Q, R, S and T are scale coefficients.

[0013] Further, the specific values of A, B, C, D, E, F, G and H are obtained by:

[0014] The formation porosity neutron logging instrument is placed in a porosity standard calibration well, the near-thermal neutron detector count and the far-thermal neutron detector count in the porosity standard calibration well with different porosities are measured, and the first experimental measurement value of the ratio of the near-thermal neutron count and the far-thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities is obtained.

[0015] The first experimental measurement value is taken as the thermal neutron count ratio R t in the high formation porosity model, the formation density of the standard calibration well is taken as ρ, and the formation porosity of the standard calibration well is taken as is substituted into the high formation porosity model, and the specific values of A, B, C, D, E, F, G and H are obtained by solving.

[0016] Further, the specific values of M, N, O, P, Q, R, S and T are obtained by:

[0017] Put the formation porosity neutron logging instrument into the porosity standard calibration well, measure the near thermal neutron detector count and the far thermal neutron detector count in the porosity standard calibration well with different porosities, and obtain the second experimental measurement value of the ratio of the near thermal neutron count and the far thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities

[0018] The second experimental measurement value As the thermal neutron count ratio R t , the formation porosity of the standard calibration well is taken as φ, substituted into the low formation porosity model, and the specific values of M, N, O, P, Q, R, S and T are obtained.

[0019] Further, the thermal neutron count ratio of the target formation of the well to be measured is measured by the neutron logging instrument.

[0020] The technical scheme of the neutron logging system for measuring formation porosity of the present application is as follows:

[0021] The first substitution calculation module and the second substitution calculation module are included.

[0022] The first substitution calculation module is used to: when the target formation of the well to be measured is a high porosity formation, the thermal neutron count ratio of the target formation and the formation density of the target formation are substituted into the high formation porosity model to obtain the formation porosity of the target formation.

[0023] The second substitution calculation module is used to: when the target formation of the well to be measured is a low porosity formation, the thermal neutron count ratio of the target formation and the formation density of the target formation are substituted into the low formation porosity model to obtain the formation porosity of the target formation.

[0024] The beneficial effects of the neutron logging system for measuring formation porosity of the present application are as follows:

[0025] Compared with the prior art, the present application starts from the neutron transport theory, fully considers the influence of non-elastic scattering of neutrons on neutron moderation, uses the high formation porosity model to calculate the formation porosity when the target formation of the well to be measured is a high porosity formation, uses the low formation porosity model to calculate the formation porosity when the target formation of the well to be measured is a low porosity formation, and finally improves the accuracy and sensitivity of the porosity measurement of the target formation. And the instruments used in this method are common instruments and equipment in the field, which are easy to operate, implement and test.

[0026] On the basis of the above-mentioned scheme, the neutron logging system for measuring formation porosity of the present application can be further improved as follows.

[0027] Further, the high formation porosity model is: wherein, φ represents the formation porosity, R t is the thermal neutron count ratio, ρ is the formation density, A, B, C, D, E, F, G, H are all scale coefficients.

[0028] Further, the low formation porosity model is: wherein, φ represents the formation porosity, R t is the thermal neutron count ratio, M, N, O, P, Q, R, S, T are all scale coefficients.

[0029] Further, the first parameter determining module is further configured to:

[0030] putting the formation porosity neutron logging instrument into the porosity standard calibration well, measuring the near-thermal neutron detector count and the far-thermal neutron detector count in the porosity standard calibration well with different porosities, and obtaining the first experimental measurement value of the ratio of the near-thermal neutron count and the far-thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities

[0031] taking the first experimental measurement value as the thermal neutron count ratio R t in the high formation porosity model, taking the formation density of the standard calibration well as ρ, and taking the formation porosity of the standard calibration well as substituting into the high formation porosity model, and solving to obtain the specific values of A, B, C, D, E, F, G, H.

[0032] Further, the second parameter determining module is further configured to:

[0033] putting the formation porosity neutron logging instrument into the porosity standard calibration well, measuring the near-thermal neutron detector count and the far-thermal neutron detector count in the porosity standard calibration well with different porosities, and obtaining the second experimental measurement value of the ratio of the near-thermal neutron count and the far-thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities

[0034] taking the second experimental measurement value as the thermal neutron count ratio R t in the low formation porosity model, taking the formation porosity of the standard calibration well as φ, and substituting into the low formation porosity model, and solving to obtain the specific values of M, N, O, P, Q, R, S, T.

[0035] Furthermore, it also includes a measurement module, which is used for:

[0036] The thermal neutron count ratio of the target formation in the well to be logged is obtained by measuring with a neutron logging instrument.

[0037] The present invention provides a storage medium storing instructions, which, when read by a computer, cause the computer to execute a neutron logging method for measuring formation porosity as described in any of the preceding claims.

[0038] An electronic device according to the present invention includes a processor and the above-described storage medium, wherein the processor executes instructions in the storage medium. Attached Figure Description

[0039] Figure 1 This is a schematic flowchart of a neutron logging method for measuring formation porosity according to an embodiment of the present invention;

[0040] Figure 2 This is a graph showing the relationship between the formation porosity obtained by this invention and the actual formation porosity.

[0041] Figure 3 This is a schematic diagram of a neutron logging system for measuring formation porosity according to an embodiment of the present invention. Detailed Implementation

[0042] like Figure 1 As shown, a neutron logging method for measuring formation porosity according to an embodiment of the present invention includes the following steps:

[0043] S1. When the target formation to be logged is a high-porosity formation, the thermal neutron count ratio and formation density of the target formation are substituted into the high formation porosity model to obtain the formation porosity of the target formation.

[0044] The porosity model for high strata is as follows: in, Indicates formation porosity. R t ρ is the thermal neutron count ratio, ρ is the formation density, and A, B, C, D, E, F, G, and H are all calibration coefficients.

[0045] S2. When the target formation to be logged is a low-porosity formation, the thermal neutron count ratio and formation density of the target formation are substituted into the low formation porosity model to obtain the formation porosity of the target formation.

[0046] The low formation porosity model is as follows: Where φ represents formation porosity, R t The thermal neutron count ratio is represented by M, N, O, P, Q, R, S, and T, which are calibration coefficients.

[0047] The heat neutron count ratio of the target formation of the well to be measured is measured by the neutron logging instrument.

[0048] When the porosity of the formation is between 30-100 p.u., the formation is determined as a high porosity formation; when the porosity of the formation is between 0-30 p.u., the formation is determined as a low porosity formation. The porosity of the target formation of the well to be measured can be firstly estimated, and then S1 or S2 is determined. Compared with the prior art, the present application starts from the neutron transport theory, fully considers the influence of the non-elastic scattering of neutrons on neutron moderation, introduces the high-order polynomial of porosity at low formation porosity and introduces the formation density at high formation porosity, and finally improves the accuracy and sensitivity of the formation porosity measurement of the target formation. The instruments used in the method are all common instruments in the field, which are convenient for operation, implementation and testing.

[0049] The reasons for improving the sensitivity and accuracy of the formation porosity measurement in the target formation such as high porosity rock by introducing the high-order polynomial of porosity and the formation density are as follows:

[0050] In the conventional formation porosity measurement method, the formation porosity of the target formation is calculated according to the elastic scattering between neutrons and formation nuclei to obtain the formula "aln(R t )+b". However, when the neutron source energy of the neutron logging instrument is high, the factors affecting neutron moderation include not only the elastic scattering between neutrons and formation nuclei but also the non-elastic scattering between neutrons and formation nuclei. Therefore, when the formation porosity is small, the non-elastic scattering must be considered for the correction of the above formula. When the formation porosity is large, R t The change of the formation porosity is not obvious, which causes the decrease of the measurement sensitivity of the formation porosity. In the present application, the high-order correction term is introduced at low formation porosity to improve the measurement accuracy, and the formation density is introduced at high formation porosity. When the formation porosity changes, the change of the formation density is obvious, thereby improving the sensitivity of the formation porosity measurement in the target formation such as high porosity rock.

[0051] Optionally, in the above technical solution, the process of obtaining the specific values of A, B, C, D, E, F, G and H includes:

[0052] S10, the formation porosity neutron logging instrument is placed in the porosity standard calibration well, the near-thermal neutron detector count and the far-thermal neutron detector count in the porosity standard calibration well with different porosities are measured, and the first experimental measurement value of the ratio of the near-thermal neutron count and the far-thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities is obtained

[0053] S11, the first experimental measurement value of the ratio of the near thermal neutron detector count to the far thermal neutron detector count of the formation porosity neutron logging instrument in the porosity standard calibration well is obtained As the thermal neutron count ratio R in the high formation porosity model t The formation density of the standard calibration well is taken as p, and the formation porosity of the standard calibration well is taken as The specific values of A, B, C, D, E, F, G, and H are obtained by substituting the high formation porosity model.

[0054] Optionally, in the above technical solution, the process of obtaining the specific values of M, N, O, P, Q, R, S, and T includes:

[0055] S20, the formation porosity neutron logging instrument is placed in the porosity standard calibration well, and the near thermal neutron detector count and the far thermal neutron detector count in the porosity standard calibration well with different porosities are measured to obtain the second experimental measurement value of the ratio of the near thermal neutron count to the far thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities

[0056] S21, the second experimental measurement value of the ratio of the near thermal neutron count to the far thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well is obtained As the thermal neutron count ratio R in the low formation porosity model t The formation porosity of the standard calibration well is taken as p, and the low formation porosity model is substituted to obtain the specific values of M, N, O, P, Q, R, S, and T.

[0057] The following describes a neutron logging method for measuring formation porosity according to an embodiment of the present application, which specifically includes:

[0058] S100, a high formation porosity model and a low formation porosity model are established:

[0059] The high formation porosity model is: wherein, represents the formation porosity, R t is the thermal neutron count ratio, p is the formation density, and A, B, C, D, E, F, G, and H are calibration coefficients.

[0060] The low formation porosity model is: wherein, p represents the formation porosity, R t is the thermal neutron count ratio, and M, N, O, P, Q, R, S, and T are calibration coefficients.

[0061] S101, measuring the near thermal neutron detector count and the far thermal neutron detector count in the porosity standard calibration well with different porosities to obtain a first experimental measurement value of the ratio of the near thermal neutron count and the far thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities

[0062] S102, inputting the first experimental measurement value as the thermal neutron count ratio R in the high formation porosity model t , taking the formation density of the standard calibration well as p, and taking the formation porosity of the standard calibration well as , and substituting the high formation porosity model to obtain the specific values of A, B, C, D, E, F, G and H.

[0063] S103, placing the formation porosity neutron logging instrument into the porosity standard calibration well, measuring the near thermal neutron detector count and the far thermal neutron detector count in the porosity standard calibration well with different porosities to obtain a second experimental measurement value of the ratio of the near thermal neutron count and the far thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities

[0064] S104, inputting the second experimental measurement value as the thermal neutron count ratio R in the low formation porosity model t , taking the formation porosity of the standard calibration well as p, and substituting the low formation porosity model to obtain the specific values of M, N, O, P, Q, R, S and T.

[0065] S105, judging whether the target formation of the well to be measured is a high-porosity formation:

[0066] 1) when the target formation of the well to be measured is a high-porosity formation, obtaining the formation density of the target formation of the well to be measured through the compensated density logging instrument, obtaining the thermal neutron count ratio of the target formation of the well to be measured through the formation porosity neutron logging instrument, and inputting the high formation porosity model to calculate the formation porosity of the target formation.

[0067] 2) when the target formation of the well to be measured is a low-porosity formation, obtaining the thermal neutron count ratio of the target formation of the well to be measured through the formation porosity neutron logging instrument, and inputting the low formation porosity model to calculate the formation porosity of the target formation.

[0068] Through Figure 2 The accuracy of the formation porosity of the target formation obtained by the present application is described in detail as follows:

[0069] As Figure 2As shown, 0-30 p.u. is selected as a low porosity formation, and a low porosity formation model is used in the inversion; 30-100 p.u. is selected as a high porosity formation, and a high porosity formation model is used in the inversion. The inversion results show that different inversion models are used for different porosity formations, and good inversion accuracy can be obtained. Figure 2 As can be seen from the above, the relative deviation between the actual formation porosity and the measured porosity of the present application is not more than 1%.

[0070] In the above embodiments, although the steps are numbered S1, S2, etc., it is only a specific embodiment given by the present application, and those skilled in the art can adjust the execution order of S1, S2, etc. according to the actual situation, which is within the protection scope of the present application. It can be understood that in some embodiments, some or all of the above embodiments can be included.

[0071] As Figure 3 shown, a neutron logging system 200 for measuring formation porosity according to the present application comprises a first substitution calculation module 210 and a second substitution calculation module 220.

[0072] The first substitution calculation module 210 is configured to: when the target formation of the well to be measured is a high formation, substituting the thermal neutron count ratio of the target formation and the formation density of the target formation into a high formation porosity model to obtain the formation porosity of the target formation.

[0073] The second substitution calculation module 220 is configured to: when the target formation of the well to be measured is a low formation, substituting the thermal neutron count ratio of the target formation and the formation density of the target formation into a low formation porosity model to obtain the formation porosity of the target formation.

[0074] Compared with the prior art, the present application starts from the neutron transport theory, fully considers the influence of non-elastic scattering of neutrons on neutron moderation, and uses a high formation porosity model to calculate the formation porosity when the target formation of the well to be measured is a high formation, and uses a high formation porosity model to calculate the formation porosity when the target formation of the well to be measured is a low formation, thereby improving the accuracy and sensitivity of the porosity measurement of the target formation. And the instruments used in this method are common instruments and equipment in the field, which are easy to operate, implement and test.

[0075] Optionally, in the above technical solution, the high formation porosity model is: wherein, porosity of the formation, R t is the thermal neutron count ratio, p is the formation density, A, B, C, D, E, F, G, and H are scale coefficients.

[0076] Optionally, in the above technical solution, the low formation porosity model is: wherein φ represents the formation porosity, R t is the thermal neutron count ratio, M, N, O, P, Q, R, S, T are all scale coefficients.

[0077] Optionally, in the above technical solution, further comprising a first parameter determination module, the first parameter determination module is used for:

[0078] The formation porosity neutron logging instrument is placed in the porosity standard calibration well, the near-thermal neutron detector count and the far-thermal neutron detector count in the porosity standard calibration well with different porosities are measured, and the experimental measurement value of the ratio of the near-thermal neutron count and the far-thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities is obtained

[0079] The is taken as the thermal neutron count ratio R t in the high-formation-porosity model, the formation density of the standard calibration well is taken as ρ, and the formation porosity of the standard calibration well is taken as φ. is substituted into the high-formation-porosity model, and the specific values of A, B, C, D, E, F, G, and H are obtained.

[0080] Optionally, in the above technical solution, further comprising a second parameter determination module, the second parameter determination module is used for:

[0081] The formation porosity neutron logging instrument is placed in the porosity standard calibration well, the near-thermal neutron detector count and the far-thermal neutron detector count in the porosity standard calibration well with different porosities are measured, and the experimental measurement value of the ratio of the near-thermal neutron count and the far-thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities is obtained

[0082] The is taken as the thermal neutron count ratio R t in the low-formation-porosity model, the formation porosity of the standard calibration well is taken as φ, and the specific values of M, N, O, P, Q, R, S, and T are obtained.

[0083] Optionally, in the above technical solution, further comprising a measurement module, the measurement module is used for:

[0084] The thermal neutron count ratio of the target formation of the well to be measured is measured by the neutron logging instrument.

[0085] The above steps about the implementation of the respective functions of the parameters and the unit modules in the neutron logging system 200 for measuring formation porosity according to the present application can refer to the parameters and steps in the embodiments of the neutron logging method for measuring formation porosity, and will not be repeated here.

[0086] The application further provides a storage medium, wherein the storage medium stores instructions, and the instructions make a computer execute the method for measuring formation porosity by neutron logging according to any one of the above.

[0087] The application further provides an electronic device, comprising a processor and the storage medium, and the processor executes the instructions in the storage medium, wherein the electronic device can be a computer, a mobile phone or the like.

[0088] Those skilled in the art know that the application can be implemented as a system, a method or a computer program product.

[0089] Therefore, the present disclosure can be embodied in the form of a complete hardware, a complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software, which are generally referred to as "circuitry", "module" or "system" herein. In addition, in some embodiments, the present application can also be embodied in the form of a computer program product in one or more computer readable media, which contains computer readable program codes.

[0090] Any combination of one or more computer readable medium can be employed. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable computer diskette, 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 disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus or device.

[0091] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary, and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method of measuring formation porosity by neutron logging, characterized in that, The method comprises the following steps: When the target formation of the well to be measured is a high porosity formation, the thermal neutron count ratio of the target formation and the formation density of the target formation are substituted into a high formation porosity model to obtain the formation porosity of the target formation; When the target formation of the well to be measured is a low porosity formation, the thermal neutron count ratio of the target formation is substituted into a low formation porosity model to obtain the formation porosity of the target formation; The high formation porosity model is: wherein, represents formation porosity, , , R t is a thermal neutron count ratio, is a formation density, are both scale factors; The low formation porosity model is: wherein, represents formation porosity, R t is the thermal neutron counting ratio, M, N, O, P, Q, R, S, and T are all scale factors; the acquisition process of the specific value of the parameter, comprising: The formation porosity neutron logging instrument is placed into the porosity standard calibration well with different porosities, the near thermal neutron detector count and the far thermal neutron detector count in the porosity standard calibration well with different porosities are measured, and a first experimental measurement value R of the ratio of the near thermal neutron count and the far thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities is obtained te ( ). R te ( ) as the thermal neutron count ratio in the high formation porosity model , the formation density of the standard calibration well as , and the formation porosity of the standard calibration well as into the high formation porosity model, to obtain the specific value of ; The method further comprises an obtaining process of specific values of M, N, O, P, Q, R, S and T, which comprises the following steps: The formation porosity neutron logging instrument is placed into the porosity standard calibration well with different porosities, the near thermal neutron detector count and the far thermal neutron detector count in the porosity standard calibration well with different porosities are measured, and the second experimental measurement value r of the ratio of the near thermal neutron count and the far thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities is obtained te ( ) r te ( ) as the thermal neutron count ratio in the low formation porosity model , the formation porosity of the standard calibration well as , substitute into the low formation porosity model, and solve to obtain the specific values of M, N, O, P, Q, R, S, and T.

2. A neutron logging system for measuring formation porosity, characterized by, The method comprises a first substitution calculation module and a second substitution calculation module; The first substitution calculation module is configured to, when the target formation of the well to be measured is a high porosity formation, substitute the thermal neutron count ratio of the target formation and the formation density of the target formation into a high formation porosity model to obtain the formation porosity of the target formation; The second substitution calculation module is configured to, when the target formation of the well to be measured is a low porosity formation, substitute the thermal neutron count ratio of the target formation into a low formation porosity model to obtain the formation porosity of the target formation; The high formation porosity model is: wherein, φ represents formation porosity, , R t is a thermal neutron count ratio, is a formation density, are both scale factors; The low formation porosity model is: wherein, represents formation porosity, R t is the thermal neutron counting ratio, M, N, O, P, Q, R, S, and T are all scale factors; The method further comprises a first parameter determination module configured to: The formation porosity neutron logging instrument is placed into the porosity standard calibration well with different porosities, the near thermal neutron detector count and the far thermal neutron detector count in the porosity standard calibration well with different porosities are measured, and a first experimental measurement value R of the ratio of the near thermal neutron count and the far thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities is obtained te ( ). R te ( ) as the thermal neutron count ratio in the high formation porosity model , the formation density of the standard calibration well as , and the formation porosity of the standard calibration well as into the high formation porosity model, to obtain the specific value of ; The method further comprises a second parameter determination module configured to: The formation porosity neutron logging instrument is placed into the porosity standard calibration well with different porosities, the near thermal neutron detector count and the far thermal neutron detector count in the porosity standard calibration well with different porosities are measured, and the second experimental measurement value r of the ratio of the near thermal neutron count and the far thermal neutron count of the formation porosity neutron logging instrument in the porosity standard calibration well with different porosities is obtained te ( ). The second experimental measurement value r te ( ) is substituted into the low formation porosity model to solve for the specific values of M, N, O, P, Q, R, S, and T. , the formation porosity of the standard calibration well is substituted into the low formation porosity model to solve for the specific values of M, N, O, P, Q, R, S, and T. , the formation porosity of the standard calibration well is substituted into the low formation porosity model to solve for the specific values of M, N, O, P, Q, R, S, and T.

3. A storage medium, characterized by The storage medium stores instructions, and when the computer reads the instructions, the computer executes the method for measuring formation porosity according to claim 1.

4. An electronic device, comprising: The method comprises a processor and the storage medium according to claim 3, and the processor executes the instructions in the storage medium.

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