Lithology identification method and device based on comprehensive logging in small-caliber oil and gas exploration

Abstract

The invention provides a lithology identification method and device based on comprehensive logging in small-bore oil and gas exploration, and relates to the technical field of oil and gas exploration, and the method comprises the steps: employing a small-bore drilling machine to drill a hole in an area to be subjected to oil and gas exploration; in the drilling process, comprehensive logging is adopted, and at least one target logging parameter of the small-caliber drilling rock core is obtained; and based on the corresponding relationship between at least one logging parameter and the lithology, identifying the lithology corresponding to each target logging parameter. Through the corresponding relation between the at least one logging parameter and the lithology, the lithology corresponding to each target logging parameter can be accurately identified, and the lithology identification accuracy and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas exploration, and particularly relates to a lithology identification method and device based on comprehensive logging in small-diameter oil and gas exploration. BACKGROUND

[0002] Oil and gas exploration is a systematic work for oil and gas field development preparation, aiming to find industrial oil and gas fields and determine their distribution range, reserves and development required parameters. The process follows the principle of "finding first and exploring later", and is divided into two stages of investigation and exploration. The investigation stage includes regional survey and oil and gas detailed survey; among them, the regional survey analyzes the basin structure, source-reservoir-cap combination and oil and gas generation conditions through geological mapping, gravity and magnetic force measurement, seismic exploration and benchmark well construction, and selects prospective areas; the oil and gas detailed survey focuses on trap conditions, and identifies underground structures and stratigraphic traps in combination with surface geological survey and seismic detailed survey.

[0003] In the past oil and gas exploration and development, large oilfield drilling machines are mainly used for exploration, and the drilling cost is relatively high, and the lithology is difficult to identify.

[0004] Therefore, how to identify the lithology is a problem to be solved. SUMMARY

[0005] The present application provides a lithology identification method and device based on comprehensive logging in small-diameter oil and gas exploration, to solve the problem of how to identify the lithology.

[0006] The present application provides a lithology identification method based on comprehensive logging in small-diameter oil and gas exploration, comprising: Drilling the region to be explored for oil and gas by using a small-diameter drilling machine; In the process of drilling, comprehensive logging is used to obtain at least one target logging parameter of the small-diameter drilling core; Based on the corresponding relationship between the at least one logging parameter and the lithology, the lithology corresponding to each target logging parameter is identified.

[0007] According to the lithology identification method based on comprehensive logging in small-diameter oil and gas exploration provided by the present application, the target logging parameter comprises natural potential, resistivity, density, natural gamma, caliper, acoustic wave, acoustic wave time difference and inclination; The comprehensive logging is used to obtain at least one target logging parameter of the small-diameter drilling core, comprising: The comprehensive logging is used to select a density wall-clinging combined probe, a double-receiving acoustic wave time difference probe and an inclination probe; Based on the density wall-adhesion combination sonde, the double-receiving acoustic wave travel time sonde and the inclinometer sonde, the natural electric potential, the resistivity, the density, the natural gamma and the hole diameter corresponding to the density wall-adhesion combination sonde, the acoustic wave travel time corresponding to the double-receiving acoustic wave travel time sonde and the hole inclination corresponding to the inclinometer sonde are measured.

[0008] According to the present application, a lithology identification method based on comprehensive logging in small-diameter oil and gas exploration is provided. A database is constructed, and the database includes a plurality of logging parameters of at least one borehole. For each borehole, the lithology logging response characteristics of the borehole are analyzed based on the logging parameters, and an analysis result is obtained. Based on the analysis result and the curves corresponding to the logging parameters, the lithology corresponding to the core of the borehole is determined. Based on the lithology corresponding to the core of each borehole, the corresponding relationship between the logging parameters and the lithology of each borehole is determined.

[0009] According to the present application, a lithology identification method based on comprehensive logging in small-diameter oil and gas exploration is provided. Electronic files of the boreholes are obtained. Based on the electronic files, borehole data of the boreholes are obtained by using data acquisition software, and the borehole data includes the logging parameters. Based on the logging parameters, the database is constructed.

[0010] According to the present application, a lithology identification method based on comprehensive logging in small-diameter oil and gas exploration is provided.

[0011] According to the present application, a lithology identification method based on comprehensive logging in small-diameter oil and gas exploration is provided. Based on the logging parameters, the lithology logging response characteristics of the core of each borehole are analyzed by using a lithology identification crossplot board, and an analysis result is obtained.

[0012] According to the present application, a lithology identification method based on comprehensive logging in small-diameter oil and gas exploration is provided. Based on the logging parameters, a borehole logging interpretation result map is formed. The lithology of the lithologic profile of the well logging interpretation in the well logging interpretation result map is compared with the lithology of the geological record, and whether the lithology of the lithologic profile is consistent with the actual situation recorded in the drilling is determined.

[0013] The application further provides a lithology identification device based on comprehensive well logging in small-diameter oil and gas exploration, comprising: A drilling module is configured to drill a region to be explored for oil and gas by using a small-diameter drilling machine. A well logging module is configured to obtain at least one target well logging parameter of a small-diameter drilling core by using comprehensive well logging during drilling. A first determination module is configured to identify the lithology corresponding to each target well logging parameter based on the correspondence between the at least one well logging parameter and the lithology.

[0014] The application further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the lithology identification method based on comprehensive well logging in small-diameter oil and gas exploration according to any one of the above methods when executing the program.

[0015] The application further provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program is executable by a processor to implement the lithology identification method based on comprehensive well logging in small-diameter oil and gas exploration according to any one of the above methods.

[0016] The application further provides a computer program product comprising a computer program, wherein the computer program is executable by a processor to implement the lithology identification method based on comprehensive well logging in small-diameter oil and gas exploration according to any one of the above methods.

[0017] The application provides a lithology identification method and device based on comprehensive well logging in small-diameter oil and gas exploration, which drills a region to be explored for oil and gas by using a small-diameter drilling machine, obtains at least one target well logging parameter of a small-diameter drilling core by using comprehensive well logging during drilling, and identifies the lithology corresponding to each target well logging parameter based on the correspondence between the at least one well logging parameter and the lithology. The correspondence between the at least one well logging parameter and the lithology can accurately identify the lithology corresponding to each target well logging parameter, thereby improving the accuracy and efficiency of lithology identification. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0019] Figure 1 is one of the flowcharts of the lithology identification method based on the comprehensive logging in the small-diameter oil and gas exploration provided by the present application; Figure 2 is a schematic diagram of the cross-plot plate corresponding to the natural gamma and resistivity provided by the present application; Figure 3 is a schematic diagram of the cross-plot plate corresponding to the acoustic travel time and resistivity provided by the present application; Figure 4 is another flowchart of the lithology identification method based on the comprehensive logging in the small-diameter oil and gas exploration provided by the present application; Figure 5 is a structural schematic diagram of the lithology identification device based on the comprehensive logging in the small-diameter oil and gas exploration provided by the present application; Figure 6 is a structural schematic diagram of the electronic device provided by the present application. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0021] The lithology identification method based on the comprehensive logging in the small-diameter oil and gas exploration provided by the present application will be described below. Figures 1-4

[0022] Figure 1 is one of the flowcharts of the lithology identification method based on the comprehensive logging in the small-diameter oil and gas exploration provided by the present application, as shown in Figure 1 , the method comprises steps 101-103.

[0023] Step 101, drilling a hole in the oil and gas exploration area by using a small-diameter drilling machine.

[0024] The lithology identification method based on the comprehensive logging in the small-diameter oil and gas exploration provided by the present application can be applied to the scene of the small-diameter oil and gas exploration. After the drilling position in the oil and gas exploration area is determined, a small-diameter drilling machine is used to drill a hole in the oil and gas exploration area. The small-diameter drilling machine has low cost, can reduce the drilling cost, and has good flexibility, and is suitable for complex terrains such as mountains and partitions.

[0025] Step 102, obtaining at least one target logging parameter of the small-diameter drilling core by using the comprehensive logging.

[0026] ​Specifically, at least one target logging parameter of the small-diameter borehole core can be obtained by using comprehensive logging.

[0027] In step 103, the lithology corresponding to each target logging parameter is identified based on the correspondence between the at least one logging parameter and the lithology.

[0028] Specifically, the lithology corresponding to each target logging parameter can be identified based on the correspondence between the at least one logging parameter and the lithology, and thus the reservoir distribution of the small-diameter borehole core can be determined.

[0029] The method for identifying lithology based on comprehensive logging in small-diameter oil and gas exploration provided by the application comprises the following steps: drilling a borehole in an area to be explored for oil and gas by using a small-diameter drilling rig; obtaining at least one target logging parameter of the small-diameter borehole core by using comprehensive logging; and identifying the lithology corresponding to each target logging parameter based on the correspondence between the at least one logging parameter and the lithology. The lithology corresponding to each target logging parameter can be accurately identified based on the correspondence between the at least one logging parameter and the lithology, and the accuracy and efficiency of lithology identification are improved.

[0030] Optionally, the target logging parameters include natural potential, resistivity, density, natural gamma, hole diameter, acoustic wave, acoustic wave time difference and inclination; and the specific implementation of step 102 comprises the following steps: In the step of using comprehensive logging, a density wall-adhesion combined probe, a double-receiving acoustic wave time difference probe and an inclination probe are selected; and the natural potential corresponding to the density wall-adhesion combined probe, the resistivity, the density, the natural gamma and the hole diameter, the acoustic wave time difference corresponding to the double-receiving acoustic wave time difference probe and the inclination corresponding to the inclination probe are measured based on the density wall-adhesion combined probe, the double-receiving acoustic wave time difference probe and the inclination probe.

[0031] Specifically, the comprehensive logging uses a JHQ-2D comprehensive digital logging system. In the step of using comprehensive logging, a density wall-adhesion combined probe, a double-receiving acoustic wave time difference probe and an inclination probe are selected; wherein the density wall-adhesion combined probe is used to measure the natural potential, the resistivity, the density, the natural gamma and the hole diameter, the double-receiving acoustic wave time difference probe is used to measure the acoustic wave time difference, and the inclination probe is used to measure the inclination of the small-diameter borehole.

[0032] The natural potential is measured when the density wall-adhesion combined probe is descending, and the resistivity, the density, the natural gamma and the hole diameter and other target logging parameters are measured when the density wall-adhesion combined probe is ascending. The acoustic wave time difference can be measured by using the double-receiving acoustic wave time difference probe, and the inclination can be measured by using the inclination probe.

[0033] It should be noted that, in the working process, the up-drawing measurement method is used for measuring the resistivity, the density, the natural gamma and the hole diameter and other target logging parameters except the natural potential, the measurement speed is 6-8 m / min, the sampling interval is 0.05 m, and the measurement is strictly performed according to the specification requirements.

[0034] The target logging parameters of resistivity, density, natural gamma, natural potential, acoustic time difference and caliper obtained by the comprehensive logging can reflect the lithology of different formations and have obvious differences, thereby providing necessary parameter evidence for formation lithology division and identification.

[0035] Optionally, the corresponding relationship between the at least one logging parameter and the lithology is obtained based on the following steps: (1) constructing a database; the database comprises a plurality of logging parameters of at least one borehole.

[0036] Specifically, the database comprises a plurality of logging parameters of at least one borehole, and each borehole corresponds to a plurality of logging parameters. The logging parameters comprise natural potential, resistivity, density, natural gamma, caliper, acoustic wave, acoustic time difference and inclination.

[0037] Optionally, each logging parameter is obtained based on the comprehensive logging method.

[0038] (2) for each borehole, based on each logging parameter, analyzing the lithology logging response characteristics of the borehole to obtain an analysis result.

[0039] Specifically, for each borehole, based on each logging parameter of the borehole, the lithology logging response characteristics of the borehole can be analyzed to obtain an analysis result. The analysis result can be that the resistivity of mudstone is low in the whole region, but the natural gamma value is relatively high; the analysis result can also be that the resistivity of sandstone changes greatly, but the natural gamma value is relatively stable; the analysis result can also be that the lithology of conglomerate is relatively dispersed, and the resistivity and natural gamma value are both high.

[0040] (3) based on the analysis result and the curve corresponding to each logging parameter, determining the lithology corresponding to the core of the borehole.

[0041] Specifically, the comprehensive logging curve interpretation method can be used to obtain the curve corresponding to each logging parameter, wherein the comprehensive logging curve interpretation method is mainly based on curve shape analysis, i.e. amplitude, shape, contact relationship, secondary shape analysis, and reference to the change rule of caliper in each lithology.

[0042] Based on the analysis result and the curve corresponding to each logging parameter, the lithology corresponding to the core of the borehole can be determined.

[0043] The spatial position of the core can also be determined according to the curve corresponding to each logging parameter.

[0044] (4) based on the lithology corresponding to the core of each borehole, determining the corresponding relationship between each logging parameter and the lithology of each borehole.

[0045] Specifically, the correspondence between each logging parameter of each borehole and the lithology can be determined based on the lithology corresponding to the core of each borehole.

[0046] Optionally, the database is constructed by: Electronic files of each borehole are obtained, drilling data of each borehole is obtained by using data acquisition software based on each electronic file, the drilling data includes each logging parameter, and the database is constructed based on each logging parameter.

[0047] Specifically, the information required for the construction of the borehole database is collected and arranged, mainly including borehole columnar charts, engineering layout charts, exploration line profile charts, sample analysis result tables and other data. The paper borehole data is scanned to generate electronic files in JPEG and PDF formats, and the electronic borehole data is converted to generate electronic files in JPEG and PDF formats. Based on each electronic file, data in the electronic file is extracted by using a data acquisition software to obtain drilling data of each borehole, the drilling data includes each logging parameter, and the database is constructed based on each logging parameter.

[0048] Optionally, based on the constructed database, an exploration data comprehensive integration platform can be established to realize integrated management of the logging parameters and provide data basis and information technology support for small-diameter oil and gas exploration. The specific data information of the logging parameters can be updated in time, the borehole data is input by using a system software, and the borehole database is updated, maintained and enriched in time to provide the latest borehole data information service.

[0049] Optionally, the lithology logging response characteristics of the borehole are analyzed based on each logging parameter to obtain an analysis result, including: The lithology logging response characteristics of the core of each borehole are analyzed by using a lithology identification crossplot chart based on each logging parameter to obtain an analysis result.

[0050] Specifically, the logging parameters represent the comprehensive response of the composition structure, mineral composition and porosity of the stratum rock, and are basic data for lithology analysis and identification. For a specific set of comprehensive logging parameters, one or more lithologies of the underground stratum must be corresponded. The stratum lithology includes Quaternary (Q), Neogene (N) and Cretaceous (K1tg). The Quaternary is developed completely, widely distributed and mainly includes various gravel layers, sandy soil, gravel, silt and salinized sub-sandy soil. The Neogene is divided into Shawan group (N1s) and Taxihe group (N1t), and mainly includes quartz sandstone, green and brown red mudstone, sandy mudstone, sandstone and conglomerate. The Cretaceous Tugulu group (K1tg) mainly includes fine conglomerate, fine sandstone, siltstone, argillaceous siltstone and mudstone.

[0051] The characteristics of well logging parameters are as follows: Generally speaking, resistivity increases with increasing rock grain size. Conglomerate, fine conglomerate, gravelly coarse sandstone, and medium sandstone have high resistivity, and their resistivity decreases accordingly as the grain size decreases. Siltstone, argillaceous siltstone, silty mudstone, and mudstone have low resistivity, and their resistivity decreases accordingly as the grain size decreases, with mudstone having the lowest resistivity. Natural gamma increases with decreasing rock grain size, but is significantly affected by pore size variations. Density generally increases with increasing rock grain size, but is greatly affected by rock porosity and cementation. For example, conglomerate has a higher density, while mudstone has the lowest density. Well diameter varies significantly due to formation structure and construction conditions, directly affecting changes in natural gamma and sonic transit time parameters. Thick mudstone layers and loose formations can cause wellbore collapse, requiring well enlargement. The spontaneous potential varies considerably among different strata, often exhibiting a negative anomaly. For example, mudstone shows a higher spontaneous potential value compared to sandstone. Generally, sonic transit time decreases with increasing rock density, but it is significantly affected by variations in rock porosity, water content, and wellbore structure, resulting in a lack of strong regularity.

[0052] In summary, resistivity and natural gamma are less affected by external factors and exhibit clear variation patterns across different lithologies. Mudstone has the lowest resistivity in the entire region, a high spontaneous potential, and a low density, making it suitable as a marker layer for lithological classification. Therefore, resistivity and natural gamma can serve as the primary criteria for classifying lithology and strata, while other well logging parameters can be used as references in conjunction with lithological classification.

[0053] The characteristics of the above logging parameters provide a basis for dividing the formation and determining the lithology using integrated logging curves. However, since lithology identification is relatively complex, it is difficult to accurately identify lithology using a single logging response feature. Therefore, this invention uses the cross plot method to establish a lithology identification cross plot using two logging response features, which can identify lithology more accurately.

[0054] Figure 2 This is a schematic diagram of the cross-plot of natural gamma and resistivity provided by the present invention, as shown in the figure. Figure 2 As shown, the resistivity of mudstone is low throughout the region, but its natural gamma value is relatively high; the resistivity of sandstone varies greatly, but its natural gamma value is relatively stable; the lithology of conglomerate is relatively dispersed, with both resistivity and natural gamma values ​​at high levels, possibly due to the influence of oil and gas and uranium deposits. Overall, the various lithologies are clearly zoned on the cross-plot. Based on the cross-plot, the lithological logging response characteristics of the core samples from each borehole can be analyzed to obtain analytical results, thereby identifying the lithology corresponding to natural gamma and resistivity.

[0055] Figure 3 This is a schematic diagram of the intersection chart of acoustic time difference and resistivity provided by the present invention, as shown in the figure. Figure 3As shown in the figure, it can be seen that the acoustic travel time of various lithologies varies in a large range, and the identification range of various lithologies has an overlapping area. It can be seen that the identification effect of the acoustic travel time and the resistivity identification template is not very good, but the corresponding crossplot plate of the acoustic travel time and the resistivity can be used to analyze the lithology logging response characteristics of the core of each borehole in combination with other logging parameters, and the analysis result is obtained.

[0056] Optionally, the method further comprises: Based on the logging parameters, a borehole logging interpretation result map is formed, and the lithology of the lithology profile interpreted by logging in the logging interpretation result map is compared with the lithology recorded in the geological record to determine whether the lithology of the lithology profile conforms to the actual situation recorded in the borehole record.

[0057] Specifically, the lithology of the lithology profile recorded in the geological record data, that is, the lithology of the core at each spatial position, is recorded. Based on the logging parameters, a borehole logging interpretation result map can be formed, and the borehole logging interpretation result map represents the spatial position and lithology of the core at each space. Based on the spatial position of the core at each space represented by the borehole logging interpretation result map, the lithology of the lithology profile interpreted by logging in the logging interpretation result map is compared with the lithology of the spatial position matched with the spatial position of the core at each space represented by the borehole logging interpretation result map recorded in the geological record, to determine whether they are the same. If they are the same, it is determined that the lithology of the lithology profile conforms to the actual situation recorded in the borehole record. If they are not the same, it is determined that the lithology of the lithology profile does not conform to the actual situation recorded in the borehole record.

[0058] It should be noted that, in actual work, the change of the physical properties of the rock stratum in the individual section is complex, because the sorting of the rock particles in the rock stratum, the composition and cementation degree of the cement, and the degree of solution mineralization in the pore will all cause the same particle size of the rock stratum to have different physical properties. When the borehole profile is interpreted by using the curves corresponding to various logging parameters, not only the general law of the physical properties of the rock stratum should be comprehensively utilized, but also the particularity of the physical properties should be paid attention to. Through the analysis of the general and particular characteristics of the physical properties of the rock stratum, and by comparing and combining the geological record data and the core, the lithology interpretation is continuously summarized, and the interpretation level is improved.

[0059] Figure 4 is a flowchart of the lithology identification method based on the comprehensive logging in the small-diameter oil and gas exploration provided by the present application. Figure 4 As shown in the figure, the method comprises steps 401-412.

[0060] Step 401, obtaining electronic files of each borehole.

[0061] Step 402, based on the electronic files, obtaining borehole data of each borehole by using data acquisition software; the borehole data comprises various logging parameters.

[0062] Step 403, constructing a database based on the logging parameters.

[0063] Step 404, analyzing the lithology logging response characteristics of the core of each borehole based on the logging parameters by using a lithology identification crossplot plate to obtain an analysis result.

[0064] Step 405, determining the lithology corresponding to the core of the borehole based on the analysis result and the curve corresponding to the logging parameter.

[0065] Step 406, determining the corresponding relationship between the logging parameter and the lithology of each borehole based on the lithology corresponding to the core of each borehole.

[0066] Step 407, forming a borehole logging interpretation result map based on the logging parameters.

[0067] Step 408, comparing the lithology of the lithology profile in the logging interpretation result map with the lithology recorded in the geology to determine whether the lithology of the lithology profile conforms to the actual situation recorded in the borehole.

[0068] Step 409, drilling the borehole in the oil and gas exploration area to be explored by using a small-diameter drilling rig.

[0069] Step 410, using comprehensive logging, and selecting a density wall-adhesion combined probe, a dual-receiving acoustic travel time probe, and an inclinometer probe.

[0070] Step 411, measuring the natural potential, resistivity, density, natural gamma, and hole diameter corresponding to the density wall-adhesion combined probe, the acoustic travel time corresponding to the dual-receiving acoustic travel time probe, and the hole inclination corresponding to the inclinometer probe based on the density wall-adhesion combined probe, the dual-receiving acoustic travel time probe, and the inclinometer probe.

[0071] Step 412, identifying the lithology corresponding to each target logging parameter based on the corresponding relationship between at least one logging parameter and the lithology.

[0072] The lithology identification device based on comprehensive logging in small-diameter oil and gas exploration provided by the present application is described below, and the lithology identification device based on comprehensive logging in small-diameter oil and gas exploration described below can be correspondingly referred to the lithology identification method based on comprehensive logging in small-diameter oil and gas exploration described above.

[0073] Figure 5 FIG. 1 is a structural schematic diagram of the lithology identification device based on comprehensive logging in small-diameter oil and gas exploration provided by the present application, as shown in the figure, the lithology identification device based on comprehensive logging in small-diameter oil and gas exploration 500 comprises a borehole module 501, a logging module 502, and a first determination module 503; wherein, Figure 5 the borehole module 501 is used to drill the borehole in the oil and gas exploration area to be explored by using a small-diameter drilling rig; ​The logging module 502 is configured to obtain at least one target logging parameter of a small-diameter borehole core by using comprehensive logging. The first determination module 503 is configured to identify the lithology corresponding to each target logging parameter based on the correspondence between the at least one logging parameter and the lithology.

[0074] The lithology identification device based on comprehensive logging in small-diameter oil and gas exploration provided by the present application can drill a borehole in an oil and gas exploration area by using a small-diameter drilling machine. At least one target logging parameter of a small-diameter borehole core is obtained by using comprehensive logging during the drilling process. The lithology corresponding to each target logging parameter is identified based on the correspondence between the at least one logging parameter and the lithology. The correspondence between the at least one logging parameter and the lithology can accurately identify the lithology corresponding to each target logging parameter, thereby improving the accuracy and efficiency of lithology identification.

[0075] Optionally, the target logging parameters include natural potential, resistivity, density, natural gamma, hole diameter, acoustic wave, acoustic travel time and inclination; and the first determination module 503 is specifically configured to: The density wall combination probe, the double-receiving acoustic travel time probe and the inclination probe are selected by using comprehensive logging. The natural potential, the resistivity, the density, the natural gamma and the hole diameter corresponding to the density wall combination probe, the acoustic travel time corresponding to the double-receiving acoustic travel time probe and the inclination corresponding to the inclination probe are measured based on the density wall combination probe, the double-receiving acoustic travel time probe and the inclination probe.

[0076] Optionally, the device 500 further includes: The construction module is configured to construct a database; the database includes a plurality of logging parameters of at least one borehole. The analysis module is configured to analyze, for each borehole, the lithology logging response characteristics of the borehole based on the logging parameters, to obtain an analysis result. The second determination module is configured to determine the lithology corresponding to the core of the borehole based on the analysis result and the curves corresponding to the logging parameters. The third determination module is configured to determine the correspondence between the logging parameters and the lithology of each borehole based on the lithology corresponding to the core of each borehole.

[0077] Optionally, the construction module is specifically configured to: Electronic files of the boreholes are obtained. Drilling data of the boreholes are obtained by using data acquisition software based on the electronic files; the drilling data include the logging parameters. The database is constructed based on the logging parameters.

[0078] Optionally, each of the logging parameters is measured based on the comprehensive logging mode.

[0079] Optionally, the analysis module is specifically configured to: based on each of the logging parameters, analyze the lithology logging response characteristics of the core of each of the drill holes by using a lithology identification crossplot board, and obtain an analysis result.

[0080] Optionally, the device 500 further comprises: a forming module configured to form a drill hole logging interpretation result map based on each of the logging parameters; a comparison module configured to compare the lithology of a lithology profile of logging interpretation in the logging interpretation result map with the lithology of geological logging, and determine whether the lithology of the lithology profile conforms to the actual situation of drill hole logging.

[0081] Figure 6 is a schematic diagram of an entity structure of an electronic device provided by the present application, as shown in Figure 6 the electronic device can include a processor 610, a communications interface 620, a memory 630 and a communications bus 640, wherein the processor 610, the communications interface 620 and the memory 630 complete mutual communication through the communications bus 640. The processor 610 can invoke a logic instruction in the memory 630 to execute a lithology identification method based on comprehensive logging in small-diameter oil and gas exploration, the method comprising: using a small-diameter drilling rig to drill a hole in a region to be explored for oil and gas; using comprehensive logging to obtain at least one target logging parameter of the core of the small-diameter drill hole; and based on a corresponding relationship between the at least one logging parameter and the lithology, identifying the lithology corresponding to each of the target logging parameters.

[0082] In addition, the logic instruction in the memory 630 described above can be implemented in the form of a software functional unit and sold or used as an independent product, and can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0083] In another aspect, the present application also provides a computer program product comprising a computer program, which can be stored on a non-transitory computer readable storage medium, and the computer program is executable by a processor to enable a computer to perform the lithology identification method based on comprehensive logging in small-diameter oil and gas exploration provided by the above method, which comprises: drilling a region to be explored for oil and gas by using a small-diameter drilling rig; obtaining at least one target logging parameter of a small-diameter drilling core by using comprehensive logging; and identifying the lithology corresponding to each of the target logging parameters based on the corresponding relationship between the at least one logging parameter and the lithology.

[0084] In yet another aspect, the present application also provides a non-transitory computer readable storage medium having a computer program stored thereon, and the computer program is executable by a processor to implement the lithology identification method based on comprehensive logging in small-diameter oil and gas exploration provided by the above method, which comprises: drilling a region to be explored for oil and gas by using a small-diameter drilling rig; obtaining at least one target logging parameter of a small-diameter drilling core by using comprehensive logging; and identifying the lithology corresponding to each of the target logging parameters based on the corresponding relationship between the at least one logging parameter and the lithology.

[0085] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., they can be located in one place, or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0086] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software plus necessary general hardware platforms, and of course, can also be realized by hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0087] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A lithology identification method based on comprehensive logging in small-caliber oil and gas exploration, characterized in that, The method comprises: drilling holes in an oil and gas exploration area by using a small-diameter drilling rig; obtaining at least one target logging parameter of a small-diameter drilling core by using comprehensive logging; identifying the lithology corresponding to each target logging parameter based on the correspondence between the at least one logging parameter and the lithology.

2. The lithology identification method based on the comprehensive logging in small-bore oil and gas exploration of claim 1, characterized in that, The target logging parameters include spontaneous potential, resistivity, density, natural gamma, caliper, acoustic wave, acoustic wave time difference, and inclination. The method of obtaining at least one target logging parameter of a small-diameter drilling core by using comprehensive logging comprises: selecting a density wall-adhesion combined probe, a double-receiving acoustic wave time difference probe, and an inclination probe by using comprehensive logging; measuring the spontaneous potential, resistivity, density, natural gamma, and caliper corresponding to the density wall-adhesion combined probe, the acoustic wave time difference corresponding to the double-receiving acoustic wave time difference probe, and the inclination corresponding to the inclination probe based on the density wall-adhesion combined probe, the double-receiving acoustic wave time difference probe, and the inclination probe.

3. The method according to claim 1, wherein the method is characterized by, The correspondence between the at least one logging parameter and the lithology is obtained based on the following steps: constructing a database; the database includes a plurality of logging parameters of at least one drilling hole; for each drilling hole, analyzing the lithology logging response characteristics of the drilling hole based on each logging parameter to obtain an analysis result; determining the lithology corresponding to the core of the drilling hole based on the analysis result and the curve corresponding to each logging parameter; determining the correspondence between each logging parameter and the lithology of each drilling hole based on the lithology corresponding to the core of each drilling hole.

4. The method according to claim 3, wherein the method is characterized by, The method of constructing a database comprises: obtaining electronic files of each drilling hole; obtaining drilling data of each drilling hole by using data acquisition software based on each electronic file; the drilling data includes each logging parameter; constructing the database based on each logging parameter.

5. The method according to claim 3, wherein the method is characterized by, Each logging parameter is obtained based on the comprehensive logging method.

6. The method according to claim 3, wherein the method is characterized by, The method of analyzing the lithology logging response characteristics of the drilling hole based on each logging parameter to obtain an analysis result comprises: analyzing the lithology logging response characteristics of the core of each drilling hole by using a lithology identification crossplot based on each logging parameter to obtain an analysis result.

7. The method according to any one of claims 3 to 6, wherein the method is characterized by, The method further comprises: forming a drilling logging interpretation result map based on each logging parameter; comparing the lithology of the lithology profile in the logging interpretation result map with the lithology recorded in the geological log to determine whether the lithology of the lithology profile conforms to the actual situation recorded in the drilling log.

8. A lithology identification device based on integrated logging in small-caliber oil and gas exploration, characterized in that, The method comprises: a drilling module for drilling holes in an oil and gas exploration area by using a small-diameter drilling rig; a logging module for obtaining at least one target logging parameter of a small-diameter drilling core by using comprehensive logging; a first determination module for identifying the lithology corresponding to each target logging parameter based on the correspondence between the at least one logging parameter and the lithology.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the lithology identification method based on comprehensive logging in small-diameter oil and gas exploration according to any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the lithology identification method based on comprehensive logging in small-diameter oil and gas exploration according to any one of claims 1 to 7.

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