Multi-well, multi-curve and multi-lithology sensitive curve synchronous screening method and device

Abstract

The invention discloses a multi-well, multi-curve and multi-lithology sensitive curve synchronous screening method and device. The method comprises the steps that a well logging lithology calibration plate containing target stratum lithology data and to-be-screened curves of a sample well in a research area is established, a plurality of sample points are extracted based on the well logging lithology calibration plate, and the sample points comprise lithology types and values of all the to-be-screened curves; establishing a coordinate system comprising a plurality of parallel number axes, wherein each number axis corresponds to a different curve to be screened; projecting the sample points into a coordinate system, connecting projection points of the same sample point on different number axes to obtain a vein line, and distinguishing types of lithology by using line types or colors; and screening at least one lithology sensitive curve according to the distribution characteristics of the vein lines. According to the method, logging curves of different types and different lithological characters in multiple wells are placed in the same coordinate system for synchronous comparison through drawing of the vein lines of different sample points, the sensitive curve selection accuracy is improved, sensitive curves are not prone to missing selection, and the screening efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of geophysical well logging, and in particular to a method and device for synchronously screening multiple wells, multiple curves, and multiple lithologic sensitivity curves. Background Art

[0002] Lithologic interpretation using well-log data is a common practice in geophysics, employing a variety of methods. These range from direct observation based on log morphology differences to crossplots, curve overlap, mathematical statistics, and, more recently, computer-based artificial intelligence. Regardless of the method, accurate selection of lithologic sensitivity curves is crucial for lithologic interpretation. With the continuous expansion of oil and gas exploration in recent years, the lithologic types of identifiable formations have become increasingly complex and diverse. Simultaneously, with the rapid advancement of well-logging technology itself, the types of well-logging data are also increasing. In this context, the accurate selection of lithologic sensitivity curves is particularly important. Inaccurate sensitivity curve selection can lead to unreliable lithologic interpretation models, resulting in significant deviations between the interpretation conclusions and the actual lithology. Conversely, accurately selecting sensitivity curves significantly improves the reliability and accuracy of lithologic interpretation models, reduces trial-and-error costs, and enhances the efficiency of lithologic interpretation.

[0003] Currently, among the many methods for well logging lithologic interpretation, the sensitivity curve screening step is usually handled in the following ways: first, intuitively determining the lithologic sensitivity logging curve based on the logging principle and the characteristics of the interpretation object (such as patents CN102606150A and CN 103711482 A); second, determining the sensitivity curve by creating a pairwise intersection plot of logging curves (such as patents CN 104989392 A and CN108073745 A); and third, qualitatively determining the sensitivity curve by observing the correspondence between the curve morphology and lithologic changes (such as patent CN 108072916 A). Summary of the Invention

[0004] The inventors discovered that the above-mentioned sensitivity curve screening method has limitations to varying degrees during its application: first, there may be a large degree of human subjective interference in the screening process, affecting the accuracy of curve selection; second, when curve screening is performed on a single well basis, if the geological heterogeneity of the study area is strong, the geological characteristics of the single wells will vary, and how to screen a sensitivity curve that is representative of the region will be quite difficult; third, when the number of single wells used for sensitivity curve screening is large, the workload of screening sensitivity curves well by well is large and the efficiency is low; fourth, when there are multiple sensitivity curves, it is inconvenient to compare and select them on the same plate.

[0005] In order to at least partially solve the technical problems existing in the prior art, the inventors have made the present invention, and through specific implementation methods, provide a method and device for synchronous screening of multiple wells, multiple curves, and multiple lithology sensitivity curves, which can improve the accuracy and efficiency of sensitivity curve screening.

[0006] In a first aspect, an embodiment of the present invention provides a method for simultaneous screening of multiple wells, multiple curves, and multiple lithologic sensitivity curves, comprising:

[0007] Establish a well logging lithology calibration plate containing the target layer lithology data and the curves to be screened for the sample wells in the study area. Based on the well logging lithology calibration plate, extract multiple sample points, each of which includes the lithology type and the value of each curve to be screened;

[0008] Establish a coordinate system containing multiple parallel axes, each axis corresponding to a different curve to be screened;

[0009] Project each sample point in the coordinate system, connect the projection points of the same sample point on different axes to obtain a vein line, and use line type or color to distinguish the type of lithology;

[0010] According to the distribution characteristics of the vein lines, at least one lithologic sensitivity curve is screened.

[0011] In some embodiments, extracting multiple sample points based on the well logging lithology calibration chart further includes:

[0012] Based on the well logging lithology calibration plate, the lithology types developed in the target layer and the numerical distribution range of each curve to be screened are counted.

[0013] In some embodiments, establishing a coordinate system comprising multiple parallel axes includes:

[0014] A coordinate system comprising multiple parallel number axes is established, wherein the number axes in the coordinate system are aligned at both ends, and the values ​​at both ends match the corresponding numerical distribution range.

[0015] In some embodiments, establishing a coordinate system comprising multiple parallel axes includes:

[0016] A coordinate system consisting of multiple parallel number axes is established, and the values ​​of each number axis change in the same direction.

[0017] In some embodiments, screening at least one lithologic sensitivity curve according to the distribution characteristics of the vein lines includes screening at least one lithologic sensitivity curve according to the distribution characteristics of the vein lines on the number axis based on the following knowledge:

[0018] The more convergent the vein lines of a certain lithology on a certain numerical axis and the more obvious the differentiation from the vein lines of other lithologies, the more sensitive the screening curve corresponding to the numerical axis is to the lithology, and vice versa.

[0019] In some embodiments, the sample well is a well from which continuous core samples are taken in the target layer of the study area.

[0020] In some embodiments, before establishing the well logging lithology calibration plate containing the target layer lithology data and the curve to be screened for the sample wells in the study area, the method further includes:

[0021] The screening curves of the sample wells in the study area were standardized.

[0022] In a second aspect, an embodiment of the present invention provides a multi-well, multi-curve, and multi-lithologic sensitivity curve synchronous screening device, comprising:

[0023] The data acquisition module is used to establish a well logging lithology calibration plate containing the target layer lithology data and the curves to be screened for the sample wells in the study area. Based on the well logging lithology calibration plate, multiple sample points are extracted. Each sample point includes the lithology type and the value of each curve to be screened.

[0024] A coordinate system establishment module is used to establish a coordinate system containing multiple parallel axes, each axis corresponding to a different curve to be screened;

[0025] The vein line drawing module is used to project each sample point into the coordinate system, connect the projection points of the same sample point on different axes, obtain a vein line, and distinguish the type of lithology by line type or color;

[0026] The lithologic sensitivity curve screening module is used to screen at least one lithologic sensitivity curve according to the distribution characteristics of the vein lines.

[0027] In a third aspect, an embodiment of the present invention provides a computer storage medium storing computer executable instructions, which, when executed by a processor, implement the above-mentioned multi-well, multi-curve, and multi-lithologic sensitivity curve synchronous screening method.

[0028] In a fourth aspect, an embodiment of the present disclosure provides a server comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the above-mentioned method for simultaneous screening of multiple wells, multiple curves, and multiple lithologic sensitivity curves is implemented.

[0029] The beneficial effects of the above technical solutions provided by the embodiments of the present invention include at least:

[0030] (1) The method for synchronous screening of multi-well, multi-curve, and multi-lithologic sensitivity curves provided in an embodiment of the present invention establishes a coordinate system comprising multiple parallel axes, each axis corresponding to a different curve to be screened, and draws vein lines corresponding to different sample points in the coordinate system. This enables synchronous comparison of curves of different types in the same coordinate system, improves the accuracy of sensitive curve selection, makes it less likely that sensitive curves will be missed, and greatly improves screening efficiency.

[0031] (2) The method for synchronous screening of multiple wells, multiple curves, and multiple lithologic sensitivity curves provided by the embodiment of the present invention connects the projection points of the same sample point on different axes to obtain a vein line. One sample point corresponds to one vein line, and the possibility of two vein lines completely overlapping is very small, thereby avoiding the situation where a large number of points overlap due to a simple point-casting method, and making the final lithologic distribution vein line map more complete and representative.

[0032] (3) The embodiment of the present invention provides a method for synchronous screening of multiple wells, multiple curves, and multiple lithologic sensitivity curves. A logging lithologic calibration plate containing the target layer lithologic data and the curves to be screened is established for the sample well. Sample points are extracted based on the logging lithologic calibration plate. Therefore, sample points can be collected based on the logging curve data collection points. This is different from the traditional method of using rock sample collection points as calibration points. This improvement will greatly improve the richness and vertical continuity of the sample data.

[0033] (4) The method for simultaneous screening of multi-well, multi-curve, and multi-lithologic sensitivity curves provided by the embodiment of the present invention reduces the influence of human subjective factors in the sensitivity curve selection process and improves the objectivity of the selection results by converting the correlation between logging curves and lithology into a more intuitive line convergence degree and differentiation degree.

[0034] (5) The method for synchronously screening multiple wells, multiple curves, and multiple lithologic sensitivity curves provided by the embodiment of the present invention determines multiple wells with continuous core samples in the target layer of the study area as sample wells. The sample wells are representative and comprehensive, thereby greatly reducing the impact of geological heterogeneity on the accuracy of lithologic sensitivity curve screening.

[0035] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0036] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0038] Figure 1 This is a flow chart of the method for simultaneous screening of multiple wells, multiple curves, and multiple lithologic sensitivity curves in Example 1 of the present invention;

[0039] Figure 2 This is a flowchart for a specific implementation of the method for simultaneous screening of multiple wells, multiple curves, and multiple lithologic sensitivity curves in the second embodiment of the present invention;

[0040] Figure 3 This is a comprehensive histogram of single wells of two sample wells in Example 3 of the present invention;

[0041] Figure 4 This is an example diagram of the sensitivity curve synchronous comparison and screening coordinate system and the lithologic distribution vein lines of eight sample points in two wells in Example 3 of the present invention;

[0042] Figure 5 This is an example diagram of the sensitivity curve simultaneous comparison and screening and lithologic distribution vein line of all sample points in Example 3 of the present invention;

[0043] Figure 6 Schematic diagram of the structure of a multi-well, multi-curve, and multi-lithologic sensitivity curve synchronous screening device in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0045] It should be understood that the terms described herein are intended only to describe particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges herein, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any intermediate value within a stated value or stated range and any other stated value or intermediate value within the stated range is also encompassed by the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0046] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the invention belongs. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of any conflict with any incorporated document, the content of this specification shall prevail.

[0047] Example 1

[0048] The first embodiment of the present invention provides a method for synchronous screening of multiple wells, multiple curves and multiple lithologic sensitivity curves. Figure 1 As shown, the following steps are included:

[0049] Step S11: establishing a well logging lithology calibration plate containing target layer lithology data and a curve to be screened for the sample wells in the study area, and extracting multiple sample points based on the well logging lithology calibration plate.

[0050] Each sample point includes the lithology type and the value of each curve to be screened.

[0051] According to the lithologic data of the sample points, the curve to be screened is depth-calibrated, and a matching relationship between the lithologic data and the curve to be screened in depth is established to obtain a well logging lithologic calibration chart.

[0052] The extraction of sample points can be based on the sampling points of the logging curve. For example, if the logging curve is sampled every 0.125m, the sample points are also sampled every 0.125m, or the samples are sampled after thinning.

[0053] The sampling method of the above-mentioned sample points is different from the traditional method of using rock sample collection points as calibration points. This improvement will greatly improve the richness and vertical continuity of sample data.

[0054] Furthermore, the aforementioned sample wells are wells with continuous core sampling in the target strata of the study area. By identifying multiple wells with continuous core sampling in the target strata of the study area as sample wells, the representativeness of the sample wells is comprehensive, thereby greatly reducing the impact of geological heterogeneity on the accuracy of lithologic sensitivity curve screening.

[0055] Step S12: establishing a coordinate system including multiple parallel axes, each axis corresponding to a different curve to be screened.

[0056] Based on the well logging lithology calibration chart, the lithology types developed in the target layer and the numerical distribution range of each curve to be screened are counted.

[0057] Establish a coordinate system consisting of multiple parallel axes, with the axes aligned at both ends and their values ​​matching the corresponding numerical distribution range. This can be achieved by aligning the values ​​at both ends with the corresponding numerical distribution range, or by ensuring that the minimum value is less than the minimum value in the numerical distribution range, and the maximum value is greater than the maximum value in the numerical distribution range.

[0058] Taking the well logging curve GR as an example, if the numerical distribution range of GR in the target layer is 200 API to 500 API, the two end values ​​of the number axis corresponding to the well logging curve GR can be set to 200 API and 500 API respectively.

[0059] In some embodiments, the numerical values ​​of the axes in the established coordinate system change in the same direction.

[0060] Taking the example of each number axis being distributed vertically, the values ​​of each number axis gradually increase from top to bottom, or gradually decrease from top to bottom.

[0061] Step S13: Project each sample point in the coordinate system, connect the projection points of the same sample point on different axes to obtain a vein line, and use line type or color to distinguish the type of lithology.

[0062] Step S14: screening at least one lithologic sensitivity curve according to the distribution characteristics of the vein lines.

[0063] In some embodiments, the method may include selecting at least one lithologic sensitivity curve based on the following knowledge according to the distribution characteristics of the vein lines on the numerical axis:

[0064] The more convergent the vein lines of a certain lithology on a certain numerical axis and the more obvious the differentiation from the vein lines of other lithologies, the more sensitive the screening curve corresponding to the numerical axis is to the lithology, and vice versa.

[0065] By converting the correlation between logging curves and lithology into more intuitive line convergence and differentiation, the influence of human subjective factors in the sensitivity curve selection process is reduced and the objectivity of the selection results is improved.

[0066] The method for synchronous screening of multi-well, multi-curve, and multi-lithologic sensitivity curves provided in the first embodiment of the present invention establishes a coordinate system comprising multiple parallel axes, each axis corresponding to a different curve to be screened, and draws vein lines corresponding to different sample points in the coordinate system. This enables synchronous comparison of curves of different types in the same coordinate system, improves the accuracy of sensitive curve selection, makes it less likely that sensitive curves will be missed, and greatly improves screening efficiency.

[0067] The method for synchronous screening of multiple wells, multiple curves, and multiple lithologic sensitivity curves provided in the first embodiment of the present invention connects the projection points of the same sample point on different number axes to obtain a vein line. One sample point corresponds to one vein line, and the possibility of two vein lines completely overlapping is very small, thereby avoiding the situation where a large number of points overlap due to a simple point-casting method, and making the final lithologic distribution vein line map more complete and representative.

[0068] Example 2

[0069] The second embodiment of the present invention provides a specific implementation process of a multi-well multi-curve multi-lithologic sensitivity curve synchronous screening method, referring to Figure 2 As shown, the following steps are included:

[0070] Step S21: Screening sample wells for selecting lithologic sensitivity curves.

[0071] All wells with continuous core samples in the target layer of the study area were selected as sample wells.

[0072] Step S22: Data preparation is performed based on the sample wells, including well logging data and lithology data.

[0073] (1) Collect all the logging curves of the sample wells and standardize the curves.

[0074] (2) Through core observation and thin section identification, the lithology of the sample well is divided and determined, and the vertical distribution data of the lithology of the coring section is obtained.

[0075] Step S23: Establishing a well logging lithology calibration chart for the sample well.

[0076] (1) According to the vertical distribution data of the lithology of the sample well, the depth of the logging curve is restored.

[0077] (2) Based on the vertical distribution data of lithology and the logging curve after depth regression, a logging lithology calibration chart of the sample well is established.

[0078] Step S24: Establishing a coordinate system for synchronous comparison and screening of lithologic sensitivity curves.

[0079] (1) All the logging curves of the sample wells are used as the curves to be screened for lithologic sensitivity curves to avoid missing sensitive curves.

[0080] (2) Based on the logging lithology calibration plate of each sample well, the lithology types developed in the target layer and the numerical distribution range of each logging curve are statistically analyzed.

[0081] (3) A one-dimensional vertical axis is set for each curve, and the axes corresponding to all curves are arranged horizontally with equal intervals and aligned at the upper and lower ends to establish a coordinate system for synchronous comparison and screening of lithologic sensitivity curves.

[0082] (4) The top scale of all number axes should be greater than the maximum value of the corresponding curve, and the bottom scale should be less than the minimum value of the corresponding curve to ensure that all curve values ​​are distributed on the number axis; unify the vertical length of all number axes.

[0083] Step S25: Draw distribution vein lines of different lithologies in the coordinate system.

[0084] (1) Connect the numerical projections of the same sample point on each axis from left to right to obtain a lithologic distribution line.

[0085] (2) Vein lines of different lithologies are marked with a unique color.

[0086] Step S26: Determine the lithologic sensitivity curve.

[0087] (1) Statistically analyze the distribution patterns of different lithologies on each axis of the coordinate system for simultaneous comparison and screening of lithologic sensitivity curves. The more convergent the vein lines of a particular lithology on a certain axis are, and the more distinct they are from the vein lines of other lithologies, the more sensitive the logging curve corresponding to that axis is to that lithology, and vice versa.

[0088] Therefore, according to the convergence and differentiation degree of different lithologic vein lines, the synchronous screening of lithologic sensitivity curves is achieved.

[0089] Example 3

[0090] The third embodiment of the present invention provides an application example of a method for simultaneous screening of multiple wells, multiple curves, and multiple lithologic sensitivity curves, including the following steps:

[0091] S1: In this example, two sample wells are selected to demonstrate the specific implementation of this method.

[0092] The target intervals of the two wells are mainly shale and sandstone, and both are continuously cored.

[0093] S2: Standardize the logging data from the two sample wells. In this example, the sample well data includes acoustic transit time (AC), natural gamma ray (GR), neutron complement (CNL), density (DEN), and deep resistivity (RD) logging curves. Furthermore, through detailed core observation and lithologic identification of the coring section, the continuous vertical distribution of lithologic properties within the target layer is precisely determined.

[0094] S3: Use the well logging data and lithology data to create a single well comprehensive histogram of the two sample wells (see Figure 3 Using the lithologic profile in the single-well comprehensive histogram, the lithologic type of each logging curve data collection point (generally, the data collection density is 8 / meter) in the target layer is counted.

[0095] S4: Calculate the numerical distribution range of all logging curves of the two sample wells. The numerical distribution range of each type of logging curve should meet two principles: first, it should be able to cover the numerical distribution range of the curves of this type in all sample wells; second, the distribution range should not be expanded indefinitely, and it is best to be suitable for display. The specific numerical distribution ranges of each type of curve of the two sample wells are as follows:

[0096] AC is between 60US / F and 120US / F, GR is between 200API and 500API, CNL is between 0 and 0.6V / V, DEN is between 2G / CC and 2.5G / CC, and RD is between 10OHM.M and 1000OHM.M.

[0097] Set a one-dimensional vertical axis for each type of logging curve. The length of each axis is consistent, ensuring that the top and bottom sections of all axes are on the same horizontal plane to facilitate the subsequent connection display of lithologic vein lines. Arrange the axes corresponding to the five types of logging curves from left to right, in the order of AC, GR, CNL, DEN, and RD (see Figure 4 shown).

[0098] S5: In this embodiment, in order to more clearly demonstrate the specific marking process of multi-well and multi-lithologic distribution vein lines, the logging curves and lithologic data of one sampling section each of sample well 1 and sample well 2 are selected for display.

[0099] The 1241.3m-1241.5m well section of sample well 1 and the 1247.8m-1248.0m well section of sample well 2 were selected as demonstration examples. It can be seen from the lithologic profile that the demonstration sections of the two wells contain sandstone interlayers and shale. One depth point was taken for each sandstone interlayer and shale in each demonstration section, and the five curve values ​​corresponding to each depth point were recorded. Thus, eight sets of data with eight depth points in total for two wells, two demonstration sections, and two types of lithology were obtained. These eight sets of data were put into the synchronous comparison and screening coordinate system of the lithologic sensitivity curve established in step S4 to obtain eight vein lines. Among them, the differences in lithology are distinguished by different colors. In the embodiment, shale is black and sandstone interlayer is light gray (see Figure 4 shown).

[0100] S6: The logging curve data of all sample points in the two sample wells and the lithology data statistically calculated in step S3 are put into the lithology sensitivity curve synchronous comparison and screening coordinate system established in step S4. Different lithologies are represented by different colors. In this embodiment, shale and sandstone are marked in black and light gray respectively. Figure 5As shown. In this coordinate system, all logging curve data and lithologic data of different wells are displayed at the same time. The sensitivity of different curves to different lithologies is judged by the degree of convergence of the same color lithologic vein lines on different logging curve axes, and the degree of differentiation from vein lines of other colors. For example, the black line representing shale and the light gray line representing sandstone in the embodiment show significant differentiation and respective convergence on the GR axis, so GR is a high-quality lithologic sensitivity curve for the target layer. On the contrary, the vein lines of the two colors have neither obvious differentiation nor poor convergence on the RD axis, so the RD curve is insensitive to the lithology of the target layer. Finally, based on the degree of differentiation and convergence of the lithologic vein lines, the GR, CNL and AC curves were selected as the lithologic sensitivity curves of the target layer in the embodiment.

[0101] Based on the inventive concept of the present invention, an embodiment of the present invention further provides a multi-well multi-curve multi-lithologic sensitivity curve synchronous screening device, the structure of which is as follows: Figure 6 Shown, including:

[0102] The data acquisition module 61 is used to establish a well logging lithology calibration plate containing the target layer lithology data and the curves to be screened for the sample wells in the study area, and extract multiple sample points based on the well logging lithology calibration plate, each of which includes the lithology type and the value of each curve to be screened;

[0103] A coordinate system establishing module 62 is used to establish a coordinate system including multiple parallel axes, each axis corresponding to a different curve to be screened;

[0104] The vein line drawing module 63 is used to project each sample point into the coordinate system, connect the projection points of the same sample point on different axes, obtain a vein line, and distinguish the type of lithology by line type or color;

[0105] The lithologic sensitivity curve screening module 64 is configured to screen at least one lithologic sensitivity curve according to the distribution characteristics of the vein lines.

[0106] In some embodiments, the data acquisition module 61 is further configured to:

[0107] Based on the well logging lithology calibration plate, the lithology types developed in the target layer and the numerical distribution range of each curve to be screened are counted.

[0108] In some embodiments, the coordinate system establishment module 62 is configured to:

[0109] A coordinate system comprising multiple parallel number axes is established, wherein the number axes in the coordinate system are aligned at both ends, and the values ​​at both ends match the corresponding numerical distribution range.

[0110] In some embodiments, the coordinate system establishment module 62 is configured to:

[0111] A coordinate system consisting of multiple parallel number axes is established, and the values ​​of each number axis change in the same direction.

[0112] In some embodiments, the lithologic sensitivity curve screening module 64 is configured to screen at least one lithologic sensitivity curve based on the following knowledge according to the distribution characteristics of the vein lines on the number axis:

[0113] The more convergent the vein lines of a certain lithology on a certain numerical axis and the more obvious the differentiation from the vein lines of other lithologies, the more sensitive the screening curve corresponding to the numerical axis is to the lithology, and vice versa.

[0114] In some embodiments, the data acquisition module 61, before establishing the well logging lithology calibration plate containing the target layer lithology data and the curve to be screened for the sample wells in the study area, is further configured to:

[0115] The screening curves of the sample wells in the study area were standardized.

[0116] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0117] Based on the inventive concept of the present invention, an embodiment of the present invention further provides a computer storage medium storing computer executable instructions. When the computer executable instructions are executed by a processor, the above-mentioned multi-well, multi-curve, and multi-lithology sensitivity curve synchronous screening method is implemented.

[0118] Based on the inventive concept of the present invention, an embodiment of the present invention further provides a server, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the above-mentioned multi-well, multi-curve, and multi-lithologic sensitivity curve synchronous screening method is implemented.

[0119] Unless otherwise specifically stated, terms such as process, calculate, compute, determine, display, and the like may refer to the actions and / or processes of one or more processing or computing systems, or similar devices, that manipulate and convert data represented as physical (e.g., electronic) quantities within registers or memories of a processing system into other data similarly represented as physical quantities within the memories, registers, or other such information storage, transmission, or display devices of the processing system. Information and signals may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0120] It should be understood that the specific order or hierarchy of steps in the disclosed processes is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0121] In the foregoing detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that embodiments of the claimed subject matter require more features than are recited in each claim. On the contrary, as reflected in the appended claims, the invention comprises less than all the features of any individual disclosed embodiment. The appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0122] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein may be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps described above are generally described around their functions. Whether such functions are implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system. A skilled person may implement the described functions in an adaptable manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of this disclosure.

[0123] The steps of the methods or algorithms described in conjunction with the embodiments herein may be directly embodied as hardware, software modules executed by a processor, or a combination thereof. The software module may be located in a RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, register, hard disk, removable disk, CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and storage medium may also be present in a user terminal as discrete components.

[0124] For software implementation, the techniques described in this application can be implemented using modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or external to the processor. In the latter case, it is communicatively coupled to the processor via various means, which are well known in the art.

[0125] The foregoing description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purposes of describing the above embodiments, but one of ordinary skill in the art will recognize that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to encompass all such changes, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent the term "comprising" is used in the specification or claims, the term is intended to be encompassed in a manner similar to the term "including," as explained in terms of "including," used as a transitional word in the claims. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or."

Claims

1. A method for synchronous screening of multiple wells, multiple curves and multiple lithology sensitivity curves, characterized in that: include: Establish a well logging lithology calibration plate containing the target layer lithology data and the curves to be screened for the sample wells in the study area. Based on the well logging lithology calibration plate, extract multiple sample points, each of which includes the lithology type and the value of each curve to be screened; Establish a coordinate system containing multiple parallel axes, each axis corresponds to a different curve to be screened; Project each sample point in the coordinate system, connect the projection points of the same sample point on different axes, obtain a vein line, and use line type or color to distinguish the type of lithology; According to the distribution characteristics of the vein lines, at least one lithology sensitivity curve is screened.

2. The method according to claim 1, characterized in that: The method of extracting a plurality of sample points based on the well logging lithology calibration plate also includes: Based on the well logging lithology calibration plate, the lithology types developed in the target layer and the numerical distribution range of each curve to be screened are counted.

3. The method according to claim 2, characterized in that The establishing of a coordinate system including a plurality of parallel axes comprises: A coordinate system including multiple parallel number axes is established, wherein the number axes in the coordinate system are aligned at both ends, and the values ​​at both ends match the corresponding numerical distribution range.

4. The method according to claim 1, characterized in that: The establishing of a coordinate system including a plurality of parallel axes comprises: A coordinate system consisting of multiple parallel number axes is established, and the values ​​of each number axis change in the same direction.

5. The method according to claim 1, characterized in that The step of selecting at least one lithology sensitivity curve according to the distribution characteristics of the vein lines includes selecting at least one lithology sensitivity curve according to the distribution characteristics of the vein lines on the number axis based on the following understanding: The more convergent the vein lines of a certain lithology on a certain numerical axis, and the more distinct it is from the vein lines of other lithologies, the more sensitive the curve to be screened corresponding to the numerical axis is to the lithology, and vice versa.

6. The method according to claim 1, characterized in that The sample well is a well with continuous core samples in the target layer of the study area.

7. The method according to claim 1, characterized in that Before establishing the well logging lithology calibration plate containing the target layer lithology data and the curve to be screened of the sample wells in the study area, the method further includes: The screening curves of the sample wells in the study area were standardized.

8. A multi-well, multi-curve, and multi-lithology sensitivity curve synchronous screening device, characterized in that: include: The data acquisition module is used to establish a well logging lithology calibration plate containing the target layer lithology data and the curves to be screened for the sample wells in the study area, and extract multiple sample points based on the well logging lithology calibration plate, each of which includes the lithology type and the value of each curve to be screened; A coordinate system establishment module is used to establish a coordinate system containing multiple parallel axes, each axis corresponding to a different curve to be screened; A vein line drawing module is used to project each sample point into the coordinate system, connect the projection points of the same sample point on different axes, obtain a vein line, and distinguish the type of lithology by line type or color; The lithology sensitivity curve screening module is used to screen at least one lithology sensitivity curve according to the distribution characteristics of the vein lines.

9. A computer storage medium, characterized in that The computer storage medium stores computer executable instructions, and when the computer executable instructions are executed by a processor, the method for synchronous screening of multiple wells, multiple curves, and multiple lithology sensitivity curves according to any one of claims 1 to 7 is implemented.

10. A server, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for synchronously screening multiple wells, multiple curves, and multiple lithology sensitivity curves as claimed in any one of claims 1 to 7 is implemented.

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