Method and device for evaluating development degree of tectonic fracture, electronic equipment and storage medium

Abstract

The application discloses a kind of structural fracture development degree evaluation method, device, electronic equipment and storage medium, wherein the method comprises: obtaining the historical exploration information of each target well in target area, wherein the historical exploration information includes well logging data, well logging data and data interpretation result;Determine the target brittleness index ratio and target rock thickness value corresponding to the target area based on the historical exploration information;Determine the fracture development degree evaluation standard based on the target brittleness index ratio and target rock thickness value, and evaluate the structural fracture development degree based on the fracture development degree evaluation standard.Based on the above technical solution, the evaluation parameters are determined based on the historical exploration information in the target area, and the evaluation standard of the fracture development degree is established based on the evaluation parameters, and then the reasonable prediction and evaluation of the fracture development degree are realized based on the evaluation standard, which improves the accuracy of predicting the development degree of structural fracture.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration and development technology, and in particular to a method, device, electronic equipment and storage medium for evaluating the degree of structural fracture development. Background Technology

[0002] In oil and gas basins with developed compressional anticlines, tectonic fractures are the type of natural fractures that have the greatest impact on the oil and gas permeability of clastic reservoirs. Tectonic fractures serve as both high-speed permeability channels and oil and gas storage spaces, significantly improving the permeability of low-permeability to tight clastic reservoirs. Therefore, the prediction of tectonic fracture development intervals is of great significance for the exploration and development of tight clastic reservoirs.

[0003] However, in oil and gas enrichment areas with well-developed compressional anticlines, the core of the anticline is often located at a structural high, making it a favorable area for oil and gas accumulation. Therefore, it is often the location for exploratory wells. For exploratory wells that encounter the core of compressional anticlines, the distribution of detectable structural fractures in different vertical segments is not uniform, making it difficult to accurately predict the development of structural fractures in clastic rock formations lacking core sampling and imaging logging. Summary of the Invention

[0004] This invention provides a method, apparatus, electronic device, and storage medium for evaluating the development degree of structural fractures. By constructing an evaluation standard based on historical exploration information of the target area, and making reasonable predictions and evaluations of the development degree of fractures based on the evaluation standard, the technical effect of improving the accuracy of predicting the development degree of structural fractures is achieved.

[0005] According to one aspect of the present invention, a method for evaluating the degree of structural crack development is provided, the method comprising:

[0006] Obtain historical exploration information for each target well within the target area, wherein the historical exploration information includes well logging data, well logging data, and data interpretation results;

[0007] Based on the historical exploration information, determine the target brittleness index ratio and target rock layer thickness value corresponding to the target area;

[0008] The evaluation criteria for the degree of fracture development are determined based on the target brittleness index ratio and the target rock layer thickness, and the degree of structural fracture development is evaluated based on the evaluation criteria.

[0009] According to another aspect of the present invention, a device for evaluating the degree of structural crack development is provided, the device comprising:

[0010] The information acquisition module is used to acquire historical exploration information of each target well within the target area, wherein the historical exploration information includes logging data, well logging data and data interpretation results;

[0011] The standard index determination module is used to determine the target brittleness index ratio and target rock layer thickness value corresponding to the target area based on the historical exploration information.

[0012] The evaluation module is used to determine the evaluation criteria for the degree of fracture development based on the target brittleness index ratio and the target rock layer thickness value, and to evaluate the degree of structural fracture development based on the evaluation criteria for the degree of fracture development.

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

[0014] At least one processor; and

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

[0016] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the structural crack development evaluation method according to any embodiment of the present invention.

[0017] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the structural crack development degree evaluation method according to any embodiment of the present invention.

[0018] The technical solution of this invention involves acquiring historical exploration information of each target well within a target area. This historical exploration information includes well logging data, well logging data, and data interpretation results. Based on this historical exploration information, the target brittleness index ratio and target stratum thickness value corresponding to the target area are determined. Then, based on the target brittleness index ratio and target stratum thickness value, a fracture development degree evaluation standard is determined. Finally, the degree of structural fracture development is evaluated based on this fracture development degree evaluation standard. Based on this technical solution, by determining evaluation parameters based on historical exploration information within the target area and constructing a fracture development degree evaluation standard based on these parameters, a reasonable prediction and evaluation of fracture development degree can be achieved, thus improving the accuracy of predicting the degree of structural fracture development.

[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a flowchart illustrating a method for evaluating the development degree of structural cracks provided in an embodiment of the present invention;

[0022] Figure 2 This is a flowchart of a method for evaluating the degree of structural crack development provided in an embodiment of the present invention;

[0023] Figure 3 This is a cross-plot of the brittleness index ratio and the dimensionless average linear density provided in an embodiment of the present invention;

[0024] Figure 4 This is a cross-plot of the thickness of a single rock layer and the dimensionless linear density of a single rock layer provided in an embodiment of the present invention;

[0025] Figure 5 This is a structural block diagram of a device for evaluating the degree of structural crack development provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] Example 1

[0030] Figure 1 This is a flowchart illustrating a method for evaluating the development level of structural fractures according to an embodiment of the present invention. This embodiment is applicable to situations where evaluation parameters are determined based on historical exploration information of the target area, and a fracture development level evaluation standard is constructed. The structural fracture development level is then evaluated based on this evaluation standard. This method can be executed by a structural fracture development level evaluation device, which can be implemented in hardware and / or software. The structural fracture development level evaluation device can be configured in an electronic device, which can be a terminal device or a server device, etc.

[0031] like Figure 1 As shown, the method includes:

[0032] S110. Obtain historical exploration information for each target well within the target area.

[0033] The target area can be a research area within the same structural zone selected based on research needs. Historical exploration information can be understood as historical information obtained after exploration of the target area. Historical exploration information includes logging data, well logging data, and data interpretation results. Logging data can be the logging information of each well in the target area, such as well number. Well logging data can be understood as the well logging data of each well in the target area, such as gamma logging data, sonic logging data, density logging data, etc. Interpretation results can be the results obtained after analysis based on well logging information, such as determining the formation data corresponding to the current well based on well logging data.

[0034] Specifically, the historical exploration information of each target well within the target area can be obtained. For example, researchers can select the exploration area to be studied as the target area according to their needs and obtain the historical exploration information of each target well within the target area. Alternatively, wells that meet the preset conditions can be selected from all wells in the target area as target wells, or all wells in the target area can be used as target wells. Alternatively, logging data of the target wells can be obtained, and historical exploration information corresponding to the target wells can be extracted from the database based on the logging data. For example, historical exploration information corresponding to the target wells can be extracted from the database based on the target well number.

[0035] Based on the above technical solution, the step of obtaining historical exploration information of each target well in the target area includes: obtaining the geological fold type of each well to be selected in the target area; determining at least one target well in the target area based on the geological fold type and a preset fold type, and obtaining historical exploration information corresponding to the target well based on a preset depth range.

[0036] Here, "wells to be selected" can be understood as all wells within the target area. "Geological fold type" refers to the types of geological folds, which can include compressional anticlines and synclines. Compressional anticlines are structures formed primarily by lateral pressure; they typically have steep strata on both flanks, large dip angles, are often asymmetrical, and frequently involve reverse faults. "Preset fold type" refers to the pre-defined fold types used to screen target wells; this can be compressional anticlines. "Preset depth range" refers to pre-defined depth information, based on which exploration information for the target wells within that depth range is obtained.

[0037] Specifically, the geological fold type of each candidate well within the target area is obtained, at least one target well within the target area is determined based on the geological fold type and a preset fold type, and historical exploration information corresponding to the target well is obtained based on a preset depth range. For example, the geological fold type of each candidate well within the target area can be obtained, and at least one target well can be determined based on the geological fold type and a preset fold type. Alternatively, candidate wells whose geological fold type matches the preset fold type can be used as target wells, and historical exploration information of the target well within the preset depth range can be obtained.

[0038] S120. Based on the historical exploration information, determine the target brittleness index ratio and target rock layer thickness value corresponding to the target area.

[0039] The target brittleness index ratio can be a brittleness index evaluation standard used to assess the degree of fracture development. The target rock layer thickness can be a rock layer thickness evaluation standard parameter used to assess the degree of fracture development.

[0040] Specifically, the target brittleness index ratio and target rock layer thickness value corresponding to the target area are determined based on historical exploration information. For example, the geological parameters associated with the target area can be obtained by analyzing historical exploration information, and then the target brittleness index ratio and target rock layer thickness value corresponding to the target area can be determined based on the geological parameters and used as evaluation parameters.

[0041] Based on the above technical solution, the target brittleness index ratio corresponding to the target area is determined based on the historical exploration information, including: determining the dynamic Poisson's ratio and dynamic Young's modulus of the rock corresponding to each target well based on the historical exploration information; and determining the target brittleness index ratio corresponding to the target area based on the dynamic Poisson's ratio and dynamic Young's modulus of the rock.

[0042] Among them, the dynamic Poisson's ratio of a rock can be used to describe the relationship between compressive deformation (perpendicular to the compressive force) and tensile deformation (parallel to the compressive force) of a rock under compressive force. The dynamic Young's modulus can be used to measure the elastic deformation capacity of a rock, reflecting the degree of deformation of the rock under a certain stress.

[0043] Specifically, based on the historical exploration information, the dynamic Poisson's ratio and dynamic Young's modulus of the rock corresponding to each target well are determined. Based on the dynamic Poisson's ratio and dynamic Young's modulus, the target brittleness index ratio corresponding to the target area is determined. For example, the dynamic Poisson's ratio of the rock can be obtained from density and sonic data in conventional well logging. The dynamic Poisson's ratio can be determined by... The calculation yields the result, where μ d It is the dynamic Poisson's ratio of the rock, v p and v s These are the P-wave velocity and S-wave velocity in acoustic logging, respectively; the dynamic Young's modulus can be obtained through... The calculation yields, where E d It is a dynamic style modulus, v p and v s These are the P-wave velocity and S-wave velocity in sonic logging, respectively; ρ is the rock density obtained from density logging. It should be noted that, since logging data is acquired based on preset depth step sizes, such as acquiring data every 0.125 meters, the dynamic Poisson's ratio and dynamic Young's modulus of the rock need to be calculated for logging data at different depths.

[0044] Based on the above technical solution, the step of determining the brittleness index ratio corresponding to the target region based on the dynamic Poisson's ratio and the dynamic Young's modulus of the rock includes: normalizing the dynamic Poisson's ratio and the dynamic Young's modulus of the rock to determine a normalized value; determining the brittleness index based on the normalized value; and determining the target brittleness index ratio based on the brittleness index and the historical exploration information.

[0045] The normalized value can be understood as the value obtained by normalizing the dynamic Poisson's ratio and dynamic Young's modulus of the rock. It should be noted that the normalized values ​​corresponding to the dynamic Poisson's ratio and dynamic Young's modulus of the rock are different. The brittleness index can be understood as the brittleness index corresponding to each depth value of the current target, used to evaluate the brittleness index of the formation at the current depth.

[0046] Specifically, the dynamic Poisson's ratio and the dynamic Young's modulus of the rock are normalized to determine a normalized value, and a brittleness index is determined based on the normalized value. Then, the target brittleness index ratio is determined based on the brittleness index and the historical exploration information. For example, this can be achieved through... The normalized dynamic Young's modulus at the current depth can be obtained through calculation. Calculate the normalized dynamic Poisson ratio at the current depth, where, where, (E d ) n and (μ) d ) n These are the normalized values ​​of the dynamic Young's modulus and the dynamic Poisson's ratio, respectively. dmax ,μ dmax E dmin and μ dmin These are the maximum and minimum values ​​of these two parameters, which can be 60 GPa, 0.43, 10 GPa, and 0. These values ​​are obtained statistically from data of the target layer in the study area, i.e., data based on historical exploration information. The brittleness index is then calculated based on the normalized dynamic Young's modulus and the normalized dynamic Poisson's ratio. Among them, BI d It is the brittleness index.

[0047] Based on the above technical solution, determining the target brittleness index ratio based on the brittleness index and the historical exploration information includes: dividing the target well into stratigraphic units based on the brittleness index to determine the tough and brittle formations corresponding to the target well; determining the top brittleness index ratio based on the tough and brittle formations; and determining the target brittleness index ratio based on the top brittleness index ratio and the historical exploration information.

[0048] Stratigraphic classification can be based on the brittleness index to categorize the formations of the target well. A ductile formation can be understood as one with a brittleness index greater than a preset threshold, while a brittle formation can be understood as one with a brittleness index less than a preset threshold. The top brittleness index ratio is the ratio of the brittleness index of the target brittle layer to that of the adjacent ductile layer above it.

[0049] Specifically, the target well is stratigraphically divided based on the brittleness index to determine the ductile and brittle formations corresponding to the target well. Then, the top brittleness index ratio is determined based on the ductile and brittle formations. Finally, the target brittleness index ratio is determined based on the top brittleness index ratio and the historical exploration information. It should be noted that the BI of the brittle layer... d Higher, while the toughness layer's BI d The brittle layer is relatively low, primarily composed of sandstone, but also containing a small amount of brittle mudstone. The ductile layer is mainly composed of fine-grained mudstone, including a small amount of argillaceous sandstone or gravelly sandstone. This classification scheme is not primarily based on BI. d The brittleness index is not an absolute value, but a relative value, emphasizing the difference in rock mechanical properties between the target brittle layer and adjacent ductile layers. Taking a single well as an example, in the shallower depths of 4800m to 4900m, the brittleness index threshold is approximately 0.41; values ​​greater than this are generally considered brittle layers, and vice versa for ductile layers. In the depth range of 4900m to 5000m, the brittleness index threshold is approximately 0.48. This means that the brittleness index threshold varies at different depths, requiring the determination of a brittleness index threshold matching the depth range based on historical exploration information to complete the stratigraphic division. Finally, the ratio of the brittleness index of the brittle layer to that of the adjacent ductile layer is determined. The brittleness index of a particular rock stratum is the average brittleness index of that stratum at the corresponding depth. The BI of the brittle layer and the ductile layers above and below it... d The ratio can be divided into the top ratio (RBI). dntop RBI (Ratio to Bottom) dnbot Two types, represented as follows: Among them, BI dn It is the average brittleness index of the target brittle layer; BI dntop and B.I. dnbot These are the average brittleness indices of the upper and lower adjacent ductile layers of the target brittle layer, respectively.

[0050] Based on the above technical solution, determining the target brittleness index ratio based on the top brittleness index ratio and the historical exploration information includes: determining the dimensionless average linear density based on the historical exploration information, and determining a brittleness index cross plot based on the dimensionless average linear density and the top brittleness index ratio; determining the intersection brittleness index value based on the brittleness index cross plot and the preset average linear density value, and determining the target brittleness index ratio based on the intersection brittleness index value.

[0051] The dimensionless average linear density can be obtained by dimensionlessly transforming the average linear density. The average linear density can be data obtained statistically based on historical exploration information. The brittleness index cross plot can be understood as a cross plot used to determine the target brittleness index ratio. It should be noted that the cross plot method is a graphical interpretation technique for well logging data. By intersecting two types of well logging data on a planar graph, the value or range of the desired parameter is determined based on the coordinates of the intersection point.

[0052] Specifically, the dimensionless average linear density is determined based on the historical exploration information, and a brittleness index cross-plot is determined based on the ratio of the dimensionless average linear density to the top brittleness index. The intersection brittleness index value is determined based on the brittleness index cross-plot and a preset average linear density value, and the target brittleness index ratio is determined based on the intersection brittleness index value. Alternatively, within each defined fractured brittle rock layer, a single-lithological segment with fractures is selected. Based on the structural fracture data identified in the imaging logging interpretation results, the sum of the number of fractures and the sum of the thicknesses of these segments are counted. The average linear density of the brittle layer is obtained by dividing the total number of fractures by the total thickness of these segments. Then, the dimensionless average linear density is obtained by dividing the average linear density of the brittle rock layer by the arithmetic mean of the average linear densities of all brittle rock layers within the target layer of the well. Finally, the dimensionless average fracture linear density is plotted as the ratio of the dimensionless average fracture linear density to the top brittleness index (BI). dntop The brittleness index cross plot between the two points is used to determine the brittleness index value at the intersection point based on the brittleness index cross plot and the preset average linear density value. The target brittleness index ratio is determined based on the brittleness index value at the intersection point. The average value can be calculated based on the brittleness index of the two intersection points and used as the target brittleness index ratio.

[0053] Based on the above technical solution, the target rock layer thickness value corresponding to the target area is determined based on the historical exploration information, including: determining the dimensionless fracture line density and rock layer thickness under a single rock layer based on the historical exploration information; determining a rock layer thickness intersection map based on the dimensionless fracture line density and the rock layer thickness; and determining the target rock layer thickness value based on the preset line density value and the rock layer thickness intersection map.

[0054] Here, a single rock stratum can be a specific location in a stratigraphic sequence, or a rock stratum with the same lithology. Dimensionless fracture linear density can be linear density data obtained by dimensionlessly processing fracture linear density. Fracture linear density can be understood as data obtained after statistical processing of historical exploration information. Preset linear density value can be a pre-set linear density threshold.

[0055] Specifically, based on the historical exploration information, the dimensionless fracture linear density and rock layer thickness under a single rock layer are determined. Then, a rock layer thickness cross-plot is determined based on the dimensionless fracture linear density and the rock layer thickness. Finally, the target rock layer thickness value is determined based on a preset linear density value and the rock layer thickness cross-plot. It should be noted that, based on the single-well lithology columnar section determined by cuttings logging and conventional logging, the depth and thickness of single rock layers with the same lithology can be identified. The depth of the single rock layer is found on the imaging logging data, and the number of fractures within it is counted. Dividing the number of fractures by the rock layer thickness yields the fracture linear density of the single rock layer. Dividing the single rock layer linear density by the arithmetic mean of the linear densities of all single rock layers within the target layer of the well yields the dimensionless linear density of the single rock layer. Then, a rock layer thickness cross-plot is determined based on the dimensionless fracture linear density and the rock layer thickness. Finally, the target rock layer thickness value is determined based on a preset linear density value and the rock layer thickness cross-plot.

[0056] S130. Determine the evaluation criteria for the degree of fracture development based on the target brittleness index ratio and the target rock layer thickness value, and evaluate the degree of structural fracture development based on the evaluation criteria for the degree of fracture development.

[0057] Among them, the evaluation standard for the degree of crack development can be understood as the standard data used to evaluate the degree of crack development.

[0058] Specifically, the evaluation criteria for the degree of fracture development are determined based on the target brittleness index ratio and the target rock layer thickness value, and the degree of structural fracture development is evaluated based on the evaluation criteria. Taking a target brittleness index ratio of 1.18 and a target rock layer thickness of 1.4 as an example, the evaluation criteria for the degree of fracture development are determined as shown in Table 1.

[0059] Table 1

[0060]

[0061] For example, for brittle layers with a brittleness index ratio greater than or equal to 1.18 at the top, the rock layers with a thickness less than or equal to 1.4 m inside often have a large fracture linear density, indicating a relatively well-developed fracture location. For brittle layers with a brittleness index ratio less than 1.18 at the top or single rock layers with a thickness greater than 1.4 m, the fracture linear density is often smaller, and fractures are generally underdeveloped. For wells in the study area that have not undergone coring and imaging logging, the degree of fracture development in the anticline core can be reasonably predicted based on the established criteria mentioned above.

[0062] The technical solution of this invention involves acquiring historical exploration information of each target well within a target area. This historical exploration information includes well logging data, well logging data, and data interpretation results. Based on this historical exploration information, the target brittleness index ratio and target stratum thickness value corresponding to the target area are determined. Then, based on the target brittleness index ratio and target stratum thickness value, a fracture development degree evaluation standard is determined. Finally, the degree of structural fracture development is evaluated based on this fracture development degree evaluation standard. Based on this technical solution, by determining evaluation parameters based on historical exploration information within the target area and constructing a fracture development degree evaluation standard based on these parameters, a reasonable prediction and evaluation of fracture development degree can be achieved, thus improving the accuracy of predicting the degree of structural fracture development.

[0063] Example 2

[0064] Figure 2 This is a flowchart illustrating a method for evaluating the development degree of structural cracks according to an embodiment of the present invention. This embodiment further optimizes the method described above. Specific implementation details can be found in the technical solution of this embodiment. Technical terms that are the same as or corresponding to those in the above embodiments will not be repeated here.

[0065] like Figure 2 As shown, the method of this embodiment of the invention includes:

[0066] Obtain historical exploration information: Specifically, select wells with complete data that encounter the core of anticlines within the same structural compression zone, and collect as much geological data as possible about the target layer, including core and lithological logging data, conventional logging data and interpretation results, imaging logging data and interpretation results, etc.

[0067] Determining the brittleness index ratio based on historical exploration information: Specifically, the dynamic Poisson's ratio of the rock is calculated based on density and sonic data from conventional well logging. The dynamic Poisson's ratio can be determined by... The calculation yields the result, where μ d It is the dynamic Poisson's ratio of the rock, v p and v s These are the P-wave velocity and S-wave velocity in acoustic logging, respectively; the dynamic Young's modulus can be obtained through... The calculation yields, where E d It is a dynamic style modulus, v p and v sThese represent the P-wave velocity and S-wave velocity in sonic logging, respectively; ρ is the rock density obtained from density logging. It should be noted that since logging data is acquired based on a preset depth step, such as acquiring data every 0.125 meters, the dynamic Poisson's ratio and dynamic Young's modulus of the rock need to be calculated for logging data at different depths. The normalized dynamic Young's modulus at the current depth can be obtained through calculation. Calculate the normalized dynamic Poisson ratio at the current depth, where, where, (E d ) n and (μ) d ) n These are the normalized values ​​of the dynamic Young's modulus and the dynamic Poisson's ratio, respectively. dmax ,μ dmax E dmin and μ dmin These are the maximum and minimum values ​​of these two parameters, which can be 60 GPa, 0.43, 10 GPa, and 0. These values ​​are obtained statistically from data of the target layer in the study area, i.e., data obtained based on historical exploration information. The brittleness index is then calculated based on the normalized dynamic Young's modulus and the normalized dynamic Poisson's ratio. Among them, BI d It is the brittleness index. Stratigraphic division is based on the brittleness index, with the BI of brittle layers... d Higher, while the toughness layer's BI d The brittle layer is relatively low, primarily composed of sandstone, but also containing a small amount of brittle mudstone. The ductile layer is mainly composed of fine-grained mudstone, including a small amount of argillaceous sandstone or gravelly sandstone. This classification scheme is not primarily based on BI. d The brittleness index is not an absolute value, but a relative value, emphasizing the difference in rock mechanical properties between the target brittle layer and adjacent ductile layers. Taking a single well as an example, in the shallower depths of 4800m to 4900m, the brittleness index threshold is approximately 0.41; values ​​greater than this are generally considered brittle layers, and vice versa for ductile layers. In the depth range of 4900m to 5000m, the brittleness index threshold is approximately 0.48. This means that the brittleness index threshold varies at different depths, requiring the determination of a brittleness index threshold matching the depth range based on historical exploration information to complete the stratigraphic division. Finally, the ratio of the brittleness index of the brittle layer to that of the adjacent ductile layer is determined. The brittleness index of a particular rock stratum is the average brittleness index of that stratum at the corresponding depth. The BI of the brittle layer and the ductile layers above and below it... d The ratio can be divided into the top ratio (RBI). dntop RBI (Ratio to Bottom) dnbot Two types, represented as follows: Among them, BI dnIt is the average brittleness index of the target brittle layer; BI dntop and B.I. dnbot These are the average brittleness indices of the adjacent tough layers above and below the target brittle layer.

[0068] Determining the target brittleness index ratio: Specifically, within each identified fractured brittle rock layer, select a single lithological segment with fractures. Based on the structural fracture data identified in the imaging logging interpretation results, count the sum of the number of fractures and the sum of the thicknesses of these segments. Divide the total number of fractures by the total thickness of these segments to obtain the average linear density of the brittle layer. Dividing the average linear density of the brittle rock layer by the arithmetic mean of the average linear densities of all brittle rock layers within the target layer of the well yields the dimensionless average linear density.

[0069] Plot the cross-plots of the dimensionless average crack linear density with respect to the ratio of the top brittleness index (BIdntop) and the bottom brittleness index (BIdnbot), respectively. Figure 3 As shown, a strong positive correlation exists between the degree of fracture development and the top brittleness index ratio (BIdntop). We selected a dimensionless average linear density of 1 as a threshold; values ​​greater than 1 indicate that the fracture development of the brittle layer is higher than the average level for that well section, while values ​​less than 1 indicate that the fracture development of the brittle layer is lower than the average level. On the cross plot, the top brittleness index ratio corresponding to the intersection of the left envelope of the data points and the line with a linear density of 1 is approximately 1.09, and the intersection of the right envelope and the line with the line with a linear density of 1 is approximately 1.27. The average BIdntop value at the two intersection points is approximately 1.18, which is a significant threshold: brittle layers with a BIdntop value greater than this value tend to have more structural fractures, while brittle layers with a BIdntop value less than this value tend to have lower fracture density.

[0070] Determining the target rock layer thickness: Specifically, based on the lithology columnar section of a single well determined by cuttings logging and conventional logging, the depth and thickness of a single rock layer with the same lithology can be identified. The depth of this single rock layer is located on the imaging logging data, and the number of fractures within it is counted. Dividing the number of fractures by the rock layer thickness yields the fracture linear density of the single rock layer. Then, dividing the linear density of the single rock layer by the arithmetic mean of the linear densities of all single rock layers within the target layer in that well yields the dimensionless linear density of the single rock layer. Based on this, data corresponding to rock layers with a fracture count of 2 or greater are selected, and a cross-plot of the dimensionless linear density and rock layer thickness of the single rock layer is plotted, such as... Figure 4As shown, the linear density of fractures gradually decreases with increasing rock layer thickness. Regression analysis of the scatter plot data in the figure yields the corresponding trend line and fitting formula. Based on the fitted formula, we can calculate the rock layer thickness corresponding to a dimensionless linear density of 1, which is approximately 1.4 m. Therefore, it can be concluded that when the thickness of a single rock layer exceeds 1.4 m, tectonic fractures are relatively well-developed.

[0071] The evaluation criteria for the development of structural fractures in the core of a compressional anticline were established. Specifically, using the brittleness index ratio limit at the top of the brittle (rock) layer and the thickness limit of a single rock layer within the brittle layer, a single-well evaluation and prediction standard for the location of vertical fractures in the core of a compressional anticline in a strongly tectonic compression zone can be established. For brittle layers with a brittleness index ratio greater than or equal to 1.18 at the top, the rock layers with a thickness less than or equal to 1.4m within them often have a large fracture linear density, indicating a relatively well-developed fracture location. For brittle layers with a brittleness index ratio less than 1.18 at the top or a single rock layer with a thickness greater than 1.4m, the fracture linear density is often smaller, and fractures are generally underdeveloped. For wells in the study area that have not undergone coring and imaging logging, the degree of fracture development in the anticline core can be reasonably predicted based on the established standards.

[0072] The technical solution of this invention involves acquiring historical exploration information of each target well within a target area. This historical exploration information includes well logging data, well logging data, and data interpretation results. Based on this historical exploration information, the target brittleness index ratio and target stratum thickness value corresponding to the target area are determined. Then, based on the target brittleness index ratio and target stratum thickness value, a fracture development degree evaluation standard is determined. Finally, the degree of structural fracture development is evaluated based on this fracture development degree evaluation standard. Based on this technical solution, by determining evaluation parameters based on historical exploration information within the target area and constructing a fracture development degree evaluation standard based on these parameters, a reasonable prediction and evaluation of fracture development degree can be achieved, thus improving the accuracy of predicting the degree of structural fracture development.

[0073] Example 3

[0074] Figure 5 This is a structural block diagram of a device for evaluating the degree of structural crack development provided in an embodiment of the present invention. Figure 5 As shown, the device includes: an image processing module 510, a defect detection module 520, and a defect indication module 530.

[0075] The information acquisition module 510 is used to acquire historical exploration information of each target well within the target area, wherein the historical exploration information includes logging data, well logging data and data interpretation results;

[0076] The standard index determination module 520 is used to determine the target brittleness index ratio and target rock layer thickness value corresponding to the target area based on the historical exploration information.

[0077] Evaluation module 530 is used to determine the evaluation standard for the degree of fracture development based on the target brittleness index ratio and the target rock layer thickness value, and to evaluate the degree of structural fracture development based on the evaluation standard for the degree of fracture development.

[0078] Based on the above technical solution, the information acquisition module is used to acquire the geological fold type of each well to be selected in the target area; determine at least one target well in the target area based on the geological fold type and the preset fold type, and acquire the historical exploration information corresponding to the target well based on the preset depth range.

[0079] Based on the above technical solution, the standard index determination module is used to determine the dynamic Poisson's ratio and dynamic Young's modulus of the rock corresponding to each target well based on the historical exploration data; and to determine the target brittleness index ratio corresponding to the target area based on the dynamic Poisson's ratio and dynamic Young's modulus of the rock.

[0080] Based on the above technical solution, the standard index determination module is used to normalize the dynamic Poisson's ratio and the dynamic Young's modulus of the rock to determine the normalized value; determine the brittleness index based on the normalized value; and determine the target brittleness index ratio based on the brittleness index and the historical exploration information.

[0081] Based on the above technical solution, the standard index determination module is used to divide the target well into formations based on the brittleness index, and determine the tough and brittle formations corresponding to the target well; determine the top brittleness index ratio based on the tough and brittle formations, and determine the target brittleness index ratio based on the top brittleness index ratio and the historical exploration information; wherein, the top brittleness index ratio is the brittleness index ratio between the target brittle layer and the adjacent tough layer above it.

[0082] Based on the above technical solution, the standard index determination module is used to determine the dimensionless average linear density based on the historical exploration information, and to determine the brittleness index cross plot based on the ratio of the dimensionless average linear density to the top brittleness index; to determine the intersection brittleness index value based on the brittleness index cross plot and the preset average linear density value, and to determine the target brittleness index ratio based on the intersection brittleness index value.

[0083] Based on the above technical solution, the standard index determination module is used to determine the dimensionless fracture line density and rock layer thickness under a single rock layer based on the historical exploration information; to determine the rock layer thickness cross plot based on the dimensionless fracture line density and the rock layer thickness; and to determine the target rock layer thickness value based on the preset line density value and the rock layer thickness cross plot.

[0084] The technical solution of this invention involves acquiring historical exploration information of each target well within a target area. This historical exploration information includes well logging data, well logging data, and data interpretation results. Based on this historical exploration information, the target brittleness index ratio and target stratum thickness value corresponding to the target area are determined. Then, based on the target brittleness index ratio and target stratum thickness value, a fracture development degree evaluation standard is determined. Finally, the degree of structural fracture development is evaluated based on this fracture development degree evaluation standard. Based on this technical solution, by determining evaluation parameters based on historical exploration information within the target area and constructing a fracture development degree evaluation standard based on these parameters, a reasonable prediction and evaluation of fracture development degree can be achieved, thus improving the accuracy of predicting the degree of structural fracture development.

[0085] The structural crack development degree evaluation device provided in the embodiments of the present invention can execute the structural crack development degree evaluation method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the method.

[0086] Example 4

[0087] Figure 6 A schematic diagram of an electronic device 10 that can be used to implement embodiments of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0088] like Figure 6As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0089] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0090] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as constructing methods for evaluating the degree of crack development.

[0091] In some embodiments, the structural crack development assessment method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the structural crack development assessment method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the structural crack development assessment method by any other suitable means (e.g., by means of firmware).

[0092] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0093] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0094] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0095] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0096] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0097] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0098] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0099] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for evaluating the degree of structural crack development, characterized in that, include: Obtain historical exploration information for each target well within the target area, wherein the historical exploration information includes well logging data, well logging data, and data interpretation results; Based on the historical exploration information, determine the target brittleness index ratio and target rock layer thickness value corresponding to the target area; The evaluation criteria for the degree of fracture development are determined based on the target brittleness index ratio and the target rock layer thickness, and the degree of structural fracture development is evaluated based on the evaluation criteria. Determining the target fragility index ratio corresponding to the target area based on the historical exploration information includes: Based on the historical exploration data, determine the dynamic Poisson's ratio and dynamic Young's modulus of the rocks corresponding to each target well; The target brittleness index ratio corresponding to the target region is determined based on the dynamic Poisson's ratio of the rock and the dynamic Young's modulus. The determination of the brittleness index ratio corresponding to the target region based on the dynamic Poisson's ratio and the dynamic Young's modulus of the rock includes: The dynamic Poisson's ratio and the dynamic Young's modulus of the rock are normalized to determine the normalized values; The brittleness index is determined based on the normalized value, and the target brittleness index ratio is determined based on the brittleness index and the historical exploration information. Determining the target brittleness index ratio based on the brittleness index and the historical exploration information includes: Based on the brittleness index, the target well is divided into strata to determine the ductile and brittle strata corresponding to the target well; The top brittleness index ratio is determined based on the ductile strata and the brittle strata, and the target brittleness index ratio is determined based on the top brittleness index ratio and the historical exploration information; wherein, the top brittleness index ratio is the brittleness index ratio between the target brittle layer and the adjacent ductile layer above it; Determining the target brittleness index ratio based on the top brittleness index ratio and the historical exploration information includes: The dimensionless average linear density is determined based on the historical exploration information, and the brittleness index cross plot is determined based on the ratio of the dimensionless average linear density to the top brittleness index. The brittleness index value at the intersection point is determined based on the brittleness index cross plot and the preset average linear density value, and the target brittleness index ratio is determined based on the brittleness index value at the intersection point. Determining the target rock layer thickness value corresponding to the target area based on the historical exploration information includes: Based on the historical exploration information, the dimensionless fracture linear density and rock layer thickness under a single rock layer are determined. A rock layer thickness cross-plot is determined based on the dimensionless fracture linear density and the rock layer thickness, and the target rock layer thickness value is determined based on the preset linear density value and the rock layer thickness cross-plot.

2. The method according to claim 1, characterized in that, The acquisition of historical exploration information for each target well within the target area includes: Obtain the geological fold type of each well to be selected within the target area; Based on the geological fold type and the preset fold type, at least one target well is determined within the target area, and historical exploration information corresponding to the target well is obtained based on the preset depth range.

3. A device for evaluating the degree of structural crack development, characterized in that, include: The information acquisition module is used to acquire historical exploration information of each target well within the target area, wherein the historical exploration information includes logging data, well logging data and data interpretation results; The standard index determination module is used to determine the target brittleness index ratio and target rock layer thickness value corresponding to the target area based on the historical exploration information. The evaluation module is used to determine the evaluation criteria for the degree of fracture development based on the target brittleness index ratio and the target rock layer thickness, and to evaluate the degree of structural fracture development based on the evaluation criteria. The standard index determination module is used to determine the dynamic Poisson's ratio and dynamic Young's modulus of the rock corresponding to each target well based on the historical exploration data; and to determine the target brittleness index ratio corresponding to the target area based on the dynamic Poisson's ratio and dynamic Young's modulus of the rock. The standard index determination module is used to normalize the dynamic Poisson's ratio and the dynamic Young's modulus of the rock to determine the normalized value; determine the brittleness index based on the normalized value; and determine the target brittleness index ratio based on the brittleness index and the historical exploration information. The standard index determination module is used to perform stratigraphic division of the target well based on the brittleness index, and determine the ductile and brittle strata corresponding to the target well; determine the top brittleness index ratio based on the ductile and brittle strata, and determine the target brittleness index ratio based on the top brittleness index ratio and the historical exploration information; wherein, the top brittleness index ratio is the brittleness index ratio of the target brittle layer to the adjacent ductile layer above it; The standard index determination module is used to determine the dimensionless average linear density based on the historical exploration information, and to determine the brittleness index cross plot based on the dimensionless average linear density and the top brittleness index ratio; to determine the intersection brittleness index value based on the brittleness index cross plot and the preset average linear density value, and to determine the target brittleness index ratio based on the intersection brittleness index value. The standard index determination module is used to determine the dimensionless fracture line density and rock layer thickness under a single rock layer based on the historical exploration information; to determine the rock layer thickness cross plot based on the dimensionless fracture line density and the rock layer thickness; and to determine the target rock layer thickness value based on the preset line density value and the rock layer thickness cross plot.

4. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the structural crack development degree evaluation method according to any one of claims 1-2.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the method for evaluating the degree of structural crack development as described in any one of claims 1-2.

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