Crack parameter evaluation method, device, electronic equipment and medium

Abstract

Disclosed are a method, device, electronic device and medium for evaluating fracture parameters. The method may include: identifying single well fractures; evaluating the model through the dual lateral component method, calculating the vertical component and horizontal component of the fracture aperture; and calculating the composite aperture, composite inclination and porosity of the fracture according to the vertical component and horizontal component of the fracture aperture. The present invention establishes a deep and shallow dual lateral component aperture joint model to evaluate the fracture component aperture, and then calculates the composite fracture aperture, composite fracture inclination and fracture porosity, thereby realizing the quantitative evaluation of fractures using conventional well logging, and laying a solid foundation for further fracture development zone prediction, fracture section productivity evaluation and the like in the later stage.

Description

Technical Field

[0001] The present invention relates to the field of petroleum exploration and development, and more specifically, to a fracture parameter evaluation method, device, electronic equipment and medium. Background Art

[0002] At present, in terms of logging technology, imaging logging is the best way to evaluate fractures, but this method is expensive and time-consuming, and is only used in some key exploration wells. Conventional logging is the most widely used in oil exploration and development. The use of conventional logging curves to evaluate fractures in reservoirs has a history of several decades, including:

[0003] The three-dimensional finite element numerical calculation method is used to simulate the dual laterolog response in two special cases: a single horizontal fracture and a single vertical fracture. The response characteristics of the two cases are analyzed, and the relationship between the logging response value and the respective opening is given.

[0004] The logging response of the dual lateral fractures at any inclination angle is derived by forward modeling, and the relationship between the dual lateral response value and the fracture opening under the conditions of quasi-horizontal fractures and quasi-vertical fractures is obtained;

[0005] Using the three-dimensional finite element numerical calculation method and the conductivity tensor method, the dual laterolog responses of single fractures, equally spaced parallel fractures, cross fractures and macroscopic anisotropic fracture formations under different inclination angles are simulated respectively. The relationship between the logging response value and the fracture inclination angle of various fractures is summarized, and the fractures are further divided into three categories, namely high-angle fractures, inclined fractures and low-angle fractures. The methods for inverting fracture porosity and fracture inclination angle under various conditions are specifically given.

[0006] The analysis software ANSYS is used to calculate the relationship between the dual laterolog value of the fracture and the fracture porosity, inclination, bedrock resistivity and mud resistivity. Based on a large number of forward modeling results, the dual laterolog response inversion formula and the fracture porosity calculation formula are obtained, and a model for elastic division of fracture inclination is proposed.

[0007] The relationship between reservoir bedrock resistivity, fracture porosity, fracture fluid conductivity and dual laterolog response under different fracture inclination conditions is summarized to improve the speed and accuracy of inversion.

[0008] Judging from the existing research at home and abroad, the current evaluation methods are roughly divided into two steps. First, the fracture dip type is determined, and then the evaluation models of the corresponding dip range are applied to carry out calculations. Although these evaluation methods are simple and easy to use, the dip angles in the formation are variable, and there are only a few fixed evaluation models. The evaluation error of fracture parameters is large, and for layers where multiple dip angle fractures are developed at the same time, it is difficult to select the evaluation model.

[0009] Therefore, it is necessary to develop a fracture parameter evaluation method, device, electronic equipment and medium using dual laterolog.

[0010] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0011] The present invention proposes a fracture parameter evaluation method, device, electronic equipment and medium, which can evaluate the fracture component aperture by establishing a deep and shallow dual lateral component aperture joint model, and then calculate the composite fracture aperture, composite fracture inclination and fracture porosity, thereby realizing the quantitative evaluation of fractures using conventional well logging, and laying a solid foundation for further fracture development zone prediction, fracture section productivity evaluation and the like in the later stage.

[0012] In a first aspect, an embodiment of the present disclosure provides a method for evaluating crack parameters, comprising:

[0013] Identify fractures in a single well;

[0014] The model was evaluated by the dual lateral component method to calculate the vertical and horizontal components of the crack aperture;

[0015] According to the vertical and horizontal components of the fracture aperture, the composite aperture, composite inclination and porosity of the fracture are calculated.

[0016] Preferably, the double lateral component method evaluation model is:

[0017]

[0018] Among them, C lld , C lls is the deep and shallow lateral conductivity, C bd , C bs is the lateral conductivity of bedrock at depth, C m is the mud conductivity, d h is the vertical component of the crack opening, d v is the horizontal component of the crack opening, D d , D s is the lateral detection radius of depth and shallowness, H is the dual lateral vertical resolution, and r' is the borehole radius.

[0019] Preferably, the composite opening of the crack is calculated by formula (2):

[0020]

[0021] Where d is the composite opening of the crack.

[0022] Preferably, the composite inclination of the crack is calculated by formula (3):

[0023]

[0024] Where α is the composite inclination angle of the crack.

[0025] Preferably, the porosity of the fracture is calculated by formula (4):

[0026]

[0027] Among them, φ f is the porosity of the crack.

[0028] As a specific implementation method of the embodiment of the present disclosure,

[0029] In a second aspect, the present disclosure also provides a crack parameter evaluation device, including:

[0030] Identification module, identifying fractures in a single well;

[0031] The calculation module evaluates the model through the dual lateral component method and calculates the vertical and horizontal components of the crack aperture;

[0032] The evaluation module calculates the composite aperture, composite inclination and porosity of the fracture according to the vertical component and horizontal component of the fracture aperture.

[0033] Preferably, the double lateral component method evaluation model is:

[0034]

[0035] Among them, C lld , C lls is the deep and shallow lateral conductivity, C bd , C bs is the lateral conductivity of bedrock at depth, C m is the mud conductivity, d h is the vertical component of the crack opening, d v is the horizontal component of the crack opening, D d , D s is the lateral detection radius of depth and shallowness, H is the dual lateral vertical resolution, and r' is the borehole radius.

[0036] Preferably, the composite opening of the crack is calculated by formula (2):

[0037]

[0038] Where d is the composite opening of the crack.

[0039] Preferably, the composite inclination of the crack is calculated by formula (3):

[0040]

[0041] Where α is the composite inclination angle of the crack.

[0042] Preferably, the porosity of the fracture is calculated by formula (4):

[0043]

[0044] Among them, φ f is the porosity of the crack.

[0045] In a third aspect, an embodiment of the present disclosure further provides an electronic device, the electronic device comprising:

[0046] A memory storing executable instructions;

[0047] A processor runs the executable instructions in the memory to implement the crack parameter evaluation method.

[0048] In a fourth aspect, an embodiment of the present disclosure further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the crack parameter evaluation method is implemented.

[0049] Its beneficial effects are:

[0050] 1) This method is not only applicable to complex fracture sections with multiple inclination angles, determining the fracture opening in different component directions, but also can calculate the comprehensive fracture apparent inclination, which has good applicability;

[0051] 2) It is easy to operate, the relationship between the parameters is clear and easy to obtain, and it has a strict mathematical expression, which is easy to calculate by computer programming.

[0052] The methods and apparatus of the present invention have other features and advantages that will be apparent from, or will be described in detail in, the accompanying drawings and subsequent detailed descriptions incorporated herein, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0054] Figure 1 A flow chart showing the steps of a method for evaluating crack parameters according to an embodiment of the present invention.

[0055] Figure 2 A schematic diagram showing the comparison between the fracture evaluation results of the tight sandstone dual lateral component method of the New X Well and the electrical imaging according to an embodiment of the present invention.

[0056] Figure 3 A block diagram of a crack parameter evaluation device according to an embodiment of the present invention is shown.

[0057] Description of reference numerals:

[0058] 201, identification module; 202, calculation module; 203, evaluation module. DETAILED DESCRIPTION

[0059] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0060] There are obvious differences in the bilateral lateral responses of horizontal and vertical cracks. The bilateral lateral resistivity of horizontal cracks decreases while there is almost no difference between the deep and shallow laterals. The resistivity of vertical cracks decreases while there is a significant positive difference between the deep and shallow laterals. This is due to the different depths of deep and shallow lateral detection, and the difference in the conductive contribution of the same crack in different detection ranges. The degree of resistivity reduction and the difference in deep and shallow laterals of oblique cracks are between the two, which can be regarded as a combination of vertical and horizontal cracks, which work together to produce a composite response on both sides.

[0061] This method makes full use of the response mechanism, decomposes fractures with different inclination angles into two fracture components, vertical and horizontal, establishes the deep and shallow lateral conductivity equations of the two-component fractures, and obtains the two-component parameters of fracture aperture by solving them simultaneously, thereby further realizing the evaluation of composite aperture, composite inclination and porosity parameters. The so-called composite parameter means that since the dual lateral resistivity response is a comprehensive expression of all conductive media within its longitudinal resolution, it is impossible to obtain the individual parameters of each fracture within its longitudinal resolution by using dual lateral evaluation of fractures, but rather the comprehensive result of multiple fractures, among which, the composite aperture refers to the aperture parameter obtained by accumulating the apertures of all fractures within the dual lateral longitudinal detection range, and the composite inclination refers to the parameter obtained by weighting the apparent inclination of all fractures within the dual lateral longitudinal detection range according to the fracture aperture, and the fracture porosity is the ratio of the volume occupied by all fractures within the dual lateral detection range to the total volume within the detection range, which is an expression of practical significance.

[0062] The present invention provides a method for evaluating crack parameters, comprising:

[0063] Identify single well fractures; specifically, based on the characteristics of tight sandstone fractures and the logging series used, one or several fracture sensitivity factors are selected, and correlation is established with the logging response of the identified fractures using methods such as cross plots or grey correlation. Fracture identification is carried out based on this correlation to form a fracture identification curve to determine the fracture development section and the non-fracture section.

[0064] The model is evaluated by the dual lateral component method to calculate the vertical component and horizontal component of the crack opening. In one example, the dual lateral component method evaluation model is:

[0065]

[0066] Among them, C lld , C lls is the deep and shallow lateral conductivity, C bd , C bs is the lateral conductivity of bedrock at depth, C m is the mud conductivity, d h is the vertical component of the crack opening, d v is the horizontal component of the crack opening, D d , D s is the deep and shallow lateral detection radius, H is the dual lateral longitudinal resolution, and r' is the borehole radius. The instrument performance parameters such as dual lateral detection radius and longitudinal resolution are fixed parameters of the actual instrument. The mud resistivity, borehole radius, and deep and shallow lateral conductivity can be directly measured by well logging. The deep and shallow lateral bedrock conductivity can be obtained by comparing the non-fracture layer of the adjacent rock layer or the corresponding layer of the adjacent well.

[0067] According to the vertical component and horizontal component of the fracture aperture, the composite aperture, composite inclination and porosity of the fracture are calculated. In one example, the composite aperture of the fracture is calculated by formula (2):

[0068]

[0069] Where d is the composite opening of the crack.

[0070] In one example, the composite inclination of the fracture is calculated by formula (3):

[0071]

[0072] Where α is the composite inclination angle of the crack.

[0073] In one example, the porosity of the fracture is calculated by formula (4):

[0074]

[0075] Among them, φ f is the porosity of the crack.

[0076] The present invention also provides a crack parameter evaluation device, comprising:

[0077] The identification module identifies single-well fractures. Specifically, based on the characteristics of tight sandstone fractures and the logging series used, one or several fracture sensitivity factors are selected, and correlation is established with the logging response of the identified fractures using methods such as cross-plots or gray correlation. Fracture identification is carried out based on this correlation to form a fracture identification curve to determine the fracture development section and non-fracture layer section.

[0078] The calculation module calculates the vertical component and the horizontal component of the crack opening by evaluating the model using the dual lateral component method. In one example, the evaluation model using the dual lateral component method is:

[0079]

[0080] Among them, C lld , C lls is the deep and shallow lateral conductivity, C bd , C bs is the lateral conductivity of bedrock at depth, C m is the mud conductivity, d h is the vertical component of the crack opening, d v is the horizontal component of the crack opening, D d , D s is the deep and shallow lateral detection radius, H is the dual lateral longitudinal resolution, and r' is the borehole radius. The instrument performance parameters such as dual lateral detection radius and longitudinal resolution are fixed parameters of the actual instrument. The mud resistivity, borehole radius, and deep and shallow lateral conductivity can be directly measured by well logging. The deep and shallow lateral bedrock conductivity can be obtained by comparing the non-fracture layer of the adjacent rock layer or the corresponding layer of the adjacent well.

[0081] The evaluation module calculates the composite aperture, composite inclination and porosity of the fracture according to the vertical component and horizontal component of the fracture aperture. In one example, the composite aperture of the fracture is calculated by formula (2):

[0082]

[0083] Where d is the composite opening of the crack.

[0084] In one example, the composite inclination of the fracture is calculated by formula (3):

[0085]

[0086] Where α is the composite inclination angle of the crack.

[0087] In one example, the porosity of the fracture is calculated by formula (4):

[0088]

[0089] Among them, φ f is the porosity of the crack.

[0090] The present invention also provides an electronic device, which includes: a memory storing executable instructions; and a processor, which runs the executable instructions in the memory to implement the above-mentioned crack parameter evaluation method.

[0091] The present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the above-mentioned crack parameter evaluation method is implemented.

[0092] To facilitate understanding of the solutions and effects of the embodiments of the present invention, four specific application examples are given below. Those skilled in the art should understand that the examples are only for facilitating understanding of the present invention, and any specific details thereof are not intended to limit the present invention in any way.

[0093] Example 1

[0094] Figure 1 A flow chart showing the steps of a method for evaluating crack parameters according to an embodiment of the present invention.

[0095] like Figure 1 As shown, the fracture parameter evaluation method includes: step 101, identifying a single well fracture; step 102, evaluating the model by a dual lateral component method, and calculating the vertical component and the horizontal component of the fracture aperture; step 103, calculating the composite aperture, composite inclination and porosity of the fracture according to the vertical component and the horizontal component of the fracture aperture.

[0096] Figure 2 A schematic diagram showing the comparison between the fracture evaluation results of the tight sandstone dual lateral component method of the New X Well and the electrical imaging according to an embodiment of the present invention.

[0097] The tight sandstone section of 4950-4970m in Xinx Well has dual lateral logging channel 3 and XRMI electrical imaging logging channel 4. The example shows the comparison between the evaluation results of fracture porosity, fracture dip and other parameters using the dual lateral component method and the XRMI evaluation results. Figure 2 As shown in the figure, the sixth track is the horizontal aperture component Aperture_Horizon and the vertical aperture component Aperture_Vertical calculated by the dual lateral component method, and further calculated parameters such as the composite apparent inclination angle FRACT_ANGLE of the fracture segment, the composite aperture Aperture of the fracture segment, and the porosity PORF_hv of the fracture segment.

[0098] In the figure, the 9th track PORF_hv is the fracture porosity evaluated by the dual lateral component method, and P33_Trace_CALC is the fracture porosity evaluation result by electrical imaging. It can be seen that the two are basically consistent; the 8th track FRACT_ANGLE is the composite inclination evaluated by the component method, which is compared with the average inclination of the fractures identified by XRMI imaging in the 5th track; the 7th track shows the comparison between the fracture aperture FVA_APPARENT evaluated by electrical imaging and the composite aperture Aperture evaluated by the component method. It can be seen that although there are differences between the two evaluation methods of composite inclination and composite aperture, the trends are basically the same. The difference is mainly caused by the difference in resolution between dual lateral and electrical imaging. Electrical imaging can identify and evaluate a single fracture, while the fracture parameters evaluated by the component method are the weighted superposition of all fractures within the dual lateral longitudinal resolution.

[0099] Example 2

[0100] Figure 3 A block diagram of a crack parameter evaluation device according to an embodiment of the present invention is shown.

[0101] like Figure 3 As shown, the crack parameter evaluation device comprises:

[0102] Identification module 201, identifying single well fractures;

[0103] A calculation module 202 is used to evaluate the model by a dual lateral component method and calculate the vertical component and the horizontal component of the crack aperture;

[0104] The evaluation module 203 calculates the composite aperture, composite inclination and porosity of the fracture according to the vertical component and the horizontal component of the fracture aperture.

[0105] As an alternative, the double lateral component method evaluation model is:

[0106]

[0107] Among them, C lld , C lls is the deep and shallow lateral conductivity, C bd , C bs is the lateral conductivity of bedrock at depth, C m is the mud conductivity, d h is the vertical component of the crack opening, d v is the horizontal component of the crack opening, D d , D s is the lateral detection radius of depth and shallowness, H is the dual lateral vertical resolution, and r' is the borehole radius.

[0108] As an alternative, the composite aperture of the crack is calculated by formula (2):

[0109]

[0110] Where d is the composite opening of the crack.

[0111] As an alternative, the composite inclination of the crack is calculated by formula (3):

[0112]

[0113] Where α is the composite inclination angle of the crack.

[0114] As an alternative, the porosity of the fracture is calculated using formula (4):

[0115]

[0116] Among them, φ f is the porosity of the crack.

[0117] Example 3

[0118] The present disclosure provides an electronic device, which includes: a memory storing executable instructions; and a processor, which runs the executable instructions in the memory to implement the above-mentioned crack parameter evaluation method.

[0119] An electronic device according to an embodiment of the present disclosure includes a memory and a processor.

[0120] The memory is used to store non-temporary computer-readable instructions. Specifically, the memory may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may, for example, include read-only memory (ROM), hard disk, flash memory, etc.

[0121] The processor may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. In one embodiment of the present disclosure, the processor is used to run the computer-readable instructions stored in the memory.

[0122] Those skilled in the art should be able to understand that in order to solve the technical problem of how to obtain a good user experience, the present embodiment may also include well-known structures such as a communication bus and an interface, and these well-known structures should also be included in the protection scope of the present disclosure.

[0123] For detailed description of this embodiment, reference may be made to the corresponding descriptions in the aforementioned embodiments, which will not be repeated here.

[0124] Example 4

[0125] An embodiment of the present disclosure provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the crack parameter evaluation method is implemented.

[0126] According to the computer-readable storage medium of the embodiment of the present disclosure, non-transitory computer-readable instructions are stored thereon. When the non-transitory computer-readable instructions are executed by a processor, all or part of the steps of the above-mentioned methods of each embodiment of the present disclosure are executed.

[0127] The above-mentioned computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or mobile hard disk), media with built-in rewritable non-volatile memory (e.g., memory card) and media with built-in ROM (e.g., ROM box).

[0128] Those skilled in the art should understand that the purpose of the above description of the embodiments of the present invention is only to exemplarily illustrate the beneficial effects of the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to any given examples.

[0129] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for evaluating crack parameters, characterized in that: include: Identify single well fractures; The model was evaluated by the dual lateral component method to calculate the vertical and horizontal components of the crack aperture; According to the vertical component and horizontal component of the fracture aperture, the composite aperture, composite inclination and porosity of the fracture are calculated; Among them, the evaluation model of the double lateral component method is: Among them, C lld , C lls is the deep and shallow lateral conductivity, C bd , C bs is the lateral conductivity of bedrock at depth, C m is the mud conductivity, d h is the vertical component of the crack opening, d v is the horizontal component of the crack opening, D d , D s is the lateral detection radius of depth and shallowness, H is the dual lateral vertical resolution, and r' is the borehole radius; Among them, the composite opening of the crack is obtained by formula (2): Where, d is the composite opening of the crack; The composite inclination of the crack is calculated by formula (3): Where α is the composite inclination of the crack; The porosity of the fracture is calculated by formula (4): Among them, φ f is the porosity of the crack.

2. A crack parameter evaluation device, characterized in that: include: Identification module, identifying fractures in a single well; The calculation module evaluates the model through the dual lateral component method and calculates the vertical and horizontal components of the crack aperture; The evaluation module calculates the composite aperture, composite inclination and porosity of the fracture based on the vertical and horizontal components of the fracture aperture; Among them, the evaluation model of the double lateral component method is: Among them, C lld , C lls is the deep and shallow lateral conductivity, C bd , C bs is the lateral conductivity of bedrock at depth, C m is the mud conductivity, d h is the vertical component of the crack opening, d v is the horizontal component of the crack opening, D d , D s is the lateral detection radius of depth and shallowness, H is the dual lateral vertical resolution, and r' is the borehole radius; Among them, the composite opening of the crack is obtained by formula (2): Where, d is the composite opening of the crack; The composite inclination of the crack is calculated by formula (3): Where α is the composite inclination of the crack; The porosity of the fracture is calculated by formula (4): Among them, φ f is the porosity of the crack.

3. An electronic device, characterized in that: The electronic device comprises: A memory storing executable instructions; A processor, wherein the processor runs the executable instructions in the memory to implement the crack parameter evaluation method according to claim 1.

4. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the crack parameter evaluation method according to claim 1 is implemented.

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