Rock core crack measuring equipment and underground actual development parameter measuring method

Abstract

The invention provides rock core crack measuring equipment and an underground actual development parameter measuring method, and the equipment comprises a bottom panel; the bottom edges of the first baffle plate and the second baffle plate are vertically arranged on the top surface of the bottom panel, and the first baffle plate and the second baffle plate are arranged in parallel; the angle measuring plate and the auxiliary guide rail plate are arranged between the first baffle and the second baffle in parallel, and the angle measuring plate and the auxiliary guide rail plate are the same in specification, are perpendicular to the bottom panel and are not tightly attached to the vertical surfaces of the baffles; the length measuring ruler is arranged on the triangular bevel edges corresponding to the angle measuring plate and the auxiliary guide rail plate respectively, is in sliding connection with the bevel edges, slides in the direction where the bevel edges are located, and is used for measuring the vertical distance between each point on the side wall of the rock core to be measured and the circular top surface.

Description

Technical Field

[0001] This application relates to the technical field of oil and gas exploration and development, and particularly to a core fracture measurement device and a method for measuring actual underground development parameters. Background Art

[0002] In the field of oil and gas exploration and development, fractures in rock reservoirs are important oil and gas storage spaces and seepage channels. They are particularly important in unconventional reservoirs with ultra-low porosity and permeability, such as shale reservoirs, tight reservoirs, and carbonate reservoirs. The higher the fracture development, the more significantly it can increase oil and gas production and multiply the oil and gas production capacity of a single well. Fractures have become an important target for finding oil and gas sweet spots in the current oil and gas exploration field. Currently, for the evaluation of fractures in oil and gas reservoirs, it is necessary to accurately obtain in-situ true strike, dip, dip angle and other attitude information of underground fractures, as well as fracture development degree information such as length, aperture, and density. The timeliness, convenience, and accuracy of obtaining these parameters are crucial for the optimal evaluation of oil and gas reservoirs, the design of fracturing and oil testing programs, the deployment of development production well patterns, and the planning of oil and gas production capacity.

[0003] At present, there are mainly core fracture measurement method, seismic data fracture prediction method, logging data fracture calculation method, geostress fracture distribution prediction method, well test data fracture inverse calculation method, etc. Among these methods, the core fracture measurement method can most intuitively and accurately reflect the true occurrence and development of underground fractures. Compared with other measurement and prediction methods, it has the advantages of direct on-site measurement, convenience, effectiveness, high accuracy, and low dependence on preliminary work. It is currently the most widely used. The core fracture measurement method mainly obtains parameters such as core fracture length, opening, angle, density, etc. by directly measuring the relevant information of fractures through on-site naked eye core observation and using tools such as rulers and protractors, which solves the practical problems of fracture reservoir evaluation to a certain extent. However, this method currently has many problems: (1) During the coring process, the drill bit carrying the core will undergo multiple rotations. After the core is taken out of the surface, it is impossible to determine the true position of the core in the underground. Therefore, this method cannot directly obtain the true in-situ dip of the fracture underground. (2) Since it is impossible to read the true in-situ dip underground, the dip angle obtained by this method is only the apparent angle between the fracture surface and the core column observed by the naked eye, not the true dip angle between the fracture and the formation. (3) The core is cylindrical, and the fractures are mostly irregular. The ruler and protractor can only be placed along a single surface of the core, and the fracture is assumed to be a simple plane. It is impossible to measure deeply inside the fracture. Only the apparent length and aperture of the fracture in the core can be roughly estimated, and the true length and aperture of the fracture inside the core cannot be obtained. (4) This method uses the core fracture line density to calculate the degree of fracture development, and counts the number of fractures per meter of core as the line density. This method can only reflect the density of fracture development, but cannot represent the contribution rate of the real reservoir space of the fracture, and cannot conduct a multi-dimensional comprehensive and detailed evaluation of the effectiveness of the fracture reservoir.

[0004] The goal is to try to solve the above technical defects in a variety of ways. (1) Obtain the real underground occurrence and development parameters of the fractures through resistivity imaging logging, and then calibrate the core fractures. Although this method can relatively accurately obtain the real underground information of the fractures, it requires advanced resistivity imaging logging equipment to be lowered into the well for measurement. It is very expensive and inconvenient to operate. In addition, due to the size of the logging equipment, it can only be applied to large-diameter coring wells (core diameter > 20cm) and cannot be implemented in small-diameter geological survey wells. It is poor in economy and practicality, and its scope of application is limited; (2) Use seismic combined with logging data to perform well-seismic calibration, and establish a relationship model between seismic, logging and core to correct each other. Predicting fracture information. This method is only applicable to mature oil and gas exploration areas with 3D seismic data and multiple well logging data. It is not applicable to low-exploration areas that lack seismic and well logging data. It is also costly. The prediction results are highly limited by the interpretation model and the quality and quantity of seismic and well logging data collected in the early stage, and the accuracy is poor. (3) Obtaining core fracture development parameters through 3D CT scanning of cores. This method can accurately obtain parameters such as the length and opening of core fractures, but it still cannot measure the actual underground trend and inclination of fractures. In addition, a small amount of cores need to be retrieved from the site to the laboratory for testing. The operation is complicated, time-consuming, labor-intensive, and expensive. For drilling of the entire well section (cumulative core length > 1000m), it is difficult to achieve 3D scanning of the entire well section. This method is a good scientific research tool, but its production timeliness and practicality are poor; (4) The development parameters of microcracks in the core are observed by means of microscopic thin sections, scanning electron microscopes, etc., and a quantitative relationship model between microscopic cracks and macroscopic cracks is established to predict the development degree of cracks. This type of method still cannot measure the tendency and inclination of cracks. In addition, due to the small size of the sample, the measurement of crack length, aperture, and density is relatively limited and cannot reflect the overall picture. As a result, the accuracy of the predicted fracture development parameters is poor. Summary of the invention

[0005] In view of this, the purpose of this application is to at least provide a core fracture measurement device and a method for measuring actual underground development parameters. The core fracture measurement device is used to measure multiple actual development degree parameters of core samples in situ underground, thereby solving the technical problem of being unable to accurately measure the development degree of core fractures, and achieving the technical effect of reducing measurement costs and increasing measurement accuracy.

[0006] This application mainly includes the following aspects: In a first aspect, an embodiment of the present application provides a core fracture measurement device, which includes: a bottom panel; a first baffle and a second baffle, the bottom edges of the first baffle and the second baffle are both vertically disposed on the top surface of the bottom panel, and the first baffle and the second baffle are parallel to each other; an angle measurement plate and an auxiliary guide rail plate, the angle measurement plate and the auxiliary guide rail plate are parallel to each other and disposed between the first baffle and the second baffle. The angle measurement plate and the auxiliary guide rail plate have the same specifications and are both triangular in shape with their vertical surfaces that are not in close contact with the baffles perpendicular to the bottom panel. Among them, the first baffle, the second baffle, the angle measurement plate, and the auxiliary guide rail plate enclose a rectangle on the bottom panel and form a groove with the bottom panel. The groove is used to place a cylindrical core to be measured. The circular top surface of the core to be measured is in close contact with one side of the angle measurement plate located in the groove, and the side wall of the core to be measured is in close contact with one side of the first baffle located in the groove, and the center of the circular top surface is maintained at the hypotenuse of the triangle. The circular top surface refers to the circular surface of the core to be measured that is closest to the ground plane; a length measuring ruler, the length measuring ruler is disposed on the hypotenuses corresponding to the angle measurement plate and the auxiliary guide rail plate respectively, and is slidably connected to the hypotenuse and slides along the direction of the hypotenuse. The length measuring ruler is used to measure the vertical distance between each point on the side wall of the core to be measured and the circular top surface; among them, a radius measuring ruler is disposed at a first connection position where the angle measurement plate is connected to the bottom panel. The radius measuring ruler is used to measure the radius length of the circular surface of the core to be measured. An angle measuring ruler is disposed at a second connection position where the angle measurement plate is connected to the second baffle. The angle measuring ruler is used to measure the included angle between the radius formed by connecting the intersection points corresponding to each scale to the center of the circle and the hypotenuse. The intersection points refer to the points where the connecting lines formed by the intersections of each scale and the connecting line between a right-angle side of the angle measurement plate and the first baffle intersect the edge of the circular surface of the core to be measured.

[0007] Optionally, each scale on the length measuring ruler is used to mark the vertical distance from the circular top surface. Each scale on the radius measuring ruler is used to mark the vertical distance from the first baffle. Each scale of the angle measuring ruler reflects the corresponding included angle through the vertical distance from the bottom panel. Among them, the angle measurement plate includes a plurality of angle measurement auxiliary lines, and each angle measurement auxiliary line is connected from the connection point of the angle measurement plate and the second baffle to the scale corresponding to the angle measurement auxiliary line on the angle measuring ruler.

[0008] Optionally, the lower scale of the length measuring ruler is located on the side close to the angle measuring plate, and the upper scale of the length measuring ruler is located on the other side close to the auxiliary guide plate. The scale range of the length measuring ruler refers to the distance from the zero mark to the vertical distance between the angle measuring plate and the auxiliary guide plate. The lower scale of the radius measuring ruler is located on the side close to the first baffle, and the upper scale of the radius measuring ruler is located on the other side close to the second baffle. The scale range of the radius measuring ruler refers to the distance from the zero mark to the length of the right-angled side of the angle measuring plate. The lower scale of the angle measuring ruler is located on the side far from the bottom panel, and the upper scale of the angle measuring ruler is located on the other side close to the bottom panel. The scale range of the angle measuring ruler refers to the distance from the zero mark to a preset included angle, and the preset included angle refers to the included angle between the hypotenuse and the perpendicular line drawn from a point on it to the bottom panel.

[0009] Optionally, the material of the angle measuring plate is selected as a transparent material. The first baffle, the second baffle, and the bottom panel are all rectangular parallelepipeds, and the first baffle and the second baffle have the same specifications. Among them, the length of the bottom panel in the first horizontal direction is equal to the sum of the upper scale of the radius measuring ruler and the lengths of the first baffle and the second baffle in the first horizontal direction. The width of the bottom panel in the second horizontal direction is equal to the sum of the upper scale of the length measuring ruler and the widths of the angle measuring plate and the auxiliary guide plate in the second horizontal direction. The height of the first baffle and the second baffle in the vertical direction is equal to the height of the angle measuring plate and the auxiliary guide plate in the vertical direction. The plane formed by the first horizontal direction and the second horizontal direction is perpendicular to the plane where the circular top surface is located, and the plane formed by the first horizontal direction and the vertical direction is parallel to the plane where the circular top surface is located.

[0010] Optionally, the radius measuring ruler is arranged on the side of the bottom panel close to the circular top surface and formed by the first horizontal direction and the vertical direction, and the angle measuring ruler is arranged on the side of the second baffle close to the circular top surface and formed by the first horizontal direction and the vertical direction.

[0011] Optionally, the length measuring ruler is a rectangular parallelepiped. Sliding guide grooves are provided at the joints where the length measuring ruler is respectively connected to the angle measuring plate and the auxiliary guide plate. The rectangular parallelepiped is vertically placed on the inclined plane formed by the triangular hypotenuses corresponding to the angle measuring plate and the auxiliary guide plate respectively. Sliding guide rails are provided on the triangular hypotenuses corresponding to the angle measuring plate and the auxiliary guide plate respectively. The sliding guide rails and the sliding guide grooves cooperate to enable the length measuring ruler to slide along the triangular hypotenuse on the inclined plane.

[0012] Optionally, the sliding guide rail is a convex guide rail, the sliding guide groove is a concave guide groove, and the convex guide rail and the concave guide groove are in convex-concave fit to enable the length measuring ruler to slide on the inclined plane along the hypotenuse of the triangle.

[0013] Second aspect, an embodiment of the present application further provides a method for measuring the actual underground development parameters of core fractures. The method is applied to the device described in the first aspect or any possible implementation manner of the first aspect above. The method includes: obtaining the formation dip value of the cored interval where the core to be measured is located, and the true dip value of the formation marker layer on the core to be measured in the in-situ underground is equal to the formation dip value; placing the core to be measured in the groove, and by reading the scales of each point on the formation marker layer of the core to be measured on the length measuring scale, determining the highest point of the formation marker layer, and marking the highest projection point of the formation marker layer projected for the highest point of the formation marker layer, the first projection diameter of the dip line corresponding to the formation marker layer passing through the highest projection point of the formation marker layer, and the lowest projection point of the formation marker layer on the circular top surface; for each fracture on the core to be measured, by reading the scales of each point on the side of the fracture closest to the circular top surface on the length measuring scale, determining the highest point of the fracture, and recording the length value of the highest point of the fracture on the length measuring scale and the length value of the relative highest point of the fracture corresponding to the highest point of the fracture on the other side of the fracture, and marking the highest projection point of the fracture projected for the highest point of the fracture, the second projection diameter of the dip line corresponding to the fracture passing through the highest projection point of the fracture, and the lowest projection point of the fracture on the edge of the circular top surface, rotating the core to be measured until the lowest projection point of the fracture intersects with the length measuring scale, and recording the length value of the lowest point of the fracture on the side closest to the circular top surface of the fracture at the intersection and the length value of the relative lowest point of the fracture corresponding to the lowest point of the fracture on the other side of the fracture; for each fracture on the core to be measured, reading the dip line angle between the second projection diameter corresponding to the fracture and the first projection diameter through the angle measuring plate, and determining the true fracture dip value of the fracture in the in-situ underground according to the dip line angle and the true dip value, marking the intersection point between the second projection diameter and the first projection diameter as the center of the circle of the circular top surface and reading the core radius of the core to be measured through the radius measuring scale; for each fracture on the core to be measured, determining the true length, true dip angle, and true maximum opening of the fracture in the in-situ underground according to the core radius, the length value of the highest point of the fracture, the length value of the relative highest point of the fracture, the length value of the lowest point of the fracture, and the length value of the relative lowest point of the fracture; for each fracture on the core to be measured, determining the proportion of the fracture space volume of the fracture in the core to be measured according to the core radius, the core length of the core to be measured, the length value of the highest point of the fracture, the length value of the relative highest point of the fracture, the length value of the lowest point of the fracture, and the length value of the relative lowest point of the fracture.

[0014] Optionally, the highest projection point of the formation marker bed refers to the point obtained by projecting the highest point of the formation marker bed along the length measuring scale towards the edge of the circular top surface. The first projection diameter refers to the diameter drawn on the circular top surface along the hypotenuse of the angle measuring plate passing through the highest projection point of the formation marker bed. The lowest projection point of the formation marker bed refers to the end point other than the highest projection point of the formation marker bed among the two end points of the first projection diameter. The highest projection point of the fracture refers to the point obtained by projecting the highest point of the fracture along the length measuring scale towards the edge of the circular top surface. The second projection diameter refers to the diameter drawn on the circular top surface along the hypotenuse of the angle measuring plate passing through the highest projection point of the fracture. The lowest projection point of the fracture refers to the end point other than the highest projection point of the fracture among the two end points on the second projection diameter.

[0015] Optionally, the method further includes: dividing each fracture in the core to be measured into multiple intervals according to the true fracture dip value and the true dip angle of each fracture; calculating the cumulative value of the proportion of the fracture space volume of all fractures in each interval, so as to reflect the fracture development degree of different intervals through the cumulative value.

[0016] A core fracture measurement device and an underground actual development parameter measurement method provided by an embodiment of the present application. The device includes: a bottom panel; a first baffle and a second baffle, the bottom edges of the first baffle and the second baffle are vertically disposed above the top surface of the bottom panel, and the first baffle and the second baffle are arranged in parallel; an angle measurement plate and an auxiliary guide rail plate, the angle measurement plate and the auxiliary guide rail plate are arranged in parallel between the first baffle and the second baffle, the angle measurement plate and the auxiliary guide rail plate have the same specifications and the vertical surfaces that are perpendicular to the bottom panel and not in close contact with the baffles are both triangular. Wherein, the first baffle, the second baffle, the angle measurement plate and the auxiliary guide rail plate enclose a rectangle on the bottom panel and form a groove with the bottom panel, the groove is used to place a cylindrical core to be measured, the circular top surface of the core to be measured is in close contact with one surface of the angle measurement plate located in the groove and the side wall of the core to be measured is in close contact with one surface of the first baffle located in the groove, and the center of the circular top surface is maintained at the hypotenuse of the triangle. The circular top surface refers to the circular surface of the core to be measured that is closest to the ground plane; a length measuring ruler, the length measuring ruler is disposed on the hypotenuses corresponding to the angle measurement plate and the auxiliary guide rail plate respectively, and is slidably connected to the hypotenuse and slides along the direction of the hypotenuse, the length measuring ruler is used to measure the vertical distance between each point on the side wall of the core to be measured and the circular top surface; wherein, a radius measuring ruler is disposed at a first connection position where the angle measurement plate is connected to the bottom panel, the radius measuring ruler is used to measure the radius length of the circular surface of the core to be measured, and an angle measuring ruler is disposed at a second connection position where the angle measurement plate is connected to the second baffle, the angle measuring ruler is used to measure the included angle between the radius formed by connecting the intersection points corresponding to each scale to the center of the circle and the hypotenuse. The intersection points refer to the points where the connecting lines formed by the intersections of each scale and the connecting line between a right-angle side of the angle measurement plate and the first baffle intersect the edge of the circular surface of the core to be measured. By using the core fracture measurement device to measure multiple development degree parameters of the core sample, the technical problem of being unable to accurately measure the development degree of the core fracture is solved, and the technical effects of reducing the measurement cost and increasing the measurement accuracy are achieved.

[0017] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given below in conjunction with the accompanying drawings and are described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Shows a schematic diagram of a core fracture measurement device provided by an embodiment of the present application.

[0020] Figure 2 Shows a side view of a core fracture measurement device provided by an embodiment of the present application.

[0021] Figure 3 Shows a top view of a core fracture measurement device provided by an embodiment of the present application.

[0022] Figure 4 Shows a side view of the application of a core fracture measurement device provided by an embodiment of the present application.

[0023] Figure 5 Shows a schematic diagram of a length measuring scale provided by an embodiment of the present application.

[0024] Figure 6 Shows a top view of a device for projecting a formation marker bed provided by an embodiment of the present application.

[0025] Figure 7 Shows a side view of a device for projecting a formation marker bed provided by an embodiment of the present application.

[0026] Figure 8 Shows the top view of a device for projecting a fracture provided by an embodiment of the present application Figure 1 。

[0027] Figure 9 Shows a side view of a device for projecting a fracture provided by an embodiment of the present application.

[0028] Figure 10 Shows the top view of a device for projecting a fracture provided by an embodiment of the present application Figure 2 。

[0029] Figure 11 Shows the schematic of the fracture state parameters provided by an embodiment of the present application Figure 1 。

[0030] Figure 12 Shows the schematic of the fracture state parameters provided by an embodiment of the present application Figure 2 。

[0031] Figure 13 Shows the spatial distribution map of the fracture development degree provided by an embodiment of the present application. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. It should be understood that the accompanying drawings in this application are only for the purposes of illustration and description, and are not used to limit the protection scope of this application. Additionally, it should be understood that the schematic drawings are not drawn to actual scale. The flowcharts used in this application illustrate the operations implemented according to some embodiments of this application. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without logical context relationships may be reversed or implemented simultaneously. Furthermore, those skilled in the art can add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of this application.

[0033] In addition, the described embodiments are only some embodiments of this application, rather than all of the embodiments. The components of the embodiments of this application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application that is required to be protected, but only represents the selected embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of this application.

[0034] In the prior art, there are problems of relatively high costs in measuring the development degree parameters of core samples through methods such as resistivity imaging logging, the relationship model among seismic, logging, and core, three-dimensional CT scanning of core, and establishing a quantitative relationship model between microfractures and macrofractures, and it is difficult to apply to all cores collected by logging. Moreover, for the evaluation of fracture development degree, the fracture line density, surface density, fracture spacing, etc. that characterize the fracture development degree are often obtained by counting the number of fractures per unit length or unit area, and methods such as fracture parameter frequency distribution diagrams, fracture rose diagrams, and fracture isodensity diagrams are used to evaluate the fracture development degree in different orientations or at different angles. The above methods can only characterize one or two of the parameters of dip, dip angle, and density, and neither can achieve an effective evaluation of fractures based on the contribution rate of reservoir space, nor can achieve a multi-dimensional comprehensive evaluation of fracture development degree that can simultaneously characterize the three parameters of dip, dip angle, and effectiveness.

[0035] Based on this, the embodiments of this application provide a core fracture measurement device and a method for measuring underground actual development parameters. By using the core fracture measurement device to measure multiple development degree parameters of core samples, the technical problem of being unable to accurately measure the development degree of core fractures is solved, and the technical effects of reducing the measurement cost and increasing the measurement accuracy are achieved, as follows: Please refer to Figure 1 、 Figure 2 and Figure 3 ,Figure 1 Schematic diagram of a core fracture measurement device provided by an embodiment of the present application Figure 2 Side view of a core fracture measurement device provided by an embodiment of the present application Figure 3 Top view of a core fracture measurement device provided by an embodiment of the present application. As Figures 1 to 3 shown, the core fracture measurement device provided by the embodiment of the present application includes: a bottom panel 1; a first baffle 2 and a second baffle 3, the bottom edges of the first baffle and the second baffle are both vertically arranged above the top surface of the bottom panel, and the first baffle and the second baffle are arranged in parallel; an angle measurement plate 4 and an auxiliary guide rail plate 5, the angle measurement plate and the auxiliary guide rail plate are arranged in parallel between the first baffle and the second baffle, the angle measurement plate and the auxiliary guide rail plate have the same specifications and the vertical surfaces that are perpendicular to the bottom panel and not in contact with the baffles are both triangular. Among them, the first baffle, the second baffle, the angle measurement plate and the auxiliary guide rail plate enclose a rectangle on the bottom panel and form a groove with the bottom panel. The groove is used to place a cylindrical core to be measured. The circular top surface of the core to be measured is in contact with one surface of the angle measurement plate located in the groove, and the side wall of the core to be measured is in contact with one surface of the first baffle located in the groove, and the center of the circular top surface is maintained at the hypotenuse of the triangle. The circular top surface refers to the circular surface of the core to be measured that is closest to the ground plane; a length measuring ruler 8, the length measuring ruler is arranged on the hypotenuses corresponding to the angle measurement plate and the auxiliary guide rail plate respectively, and is slidably connected to the hypotenuse and slides along the direction of the hypotenuse. The length measuring ruler is used to measure the vertical distance between each point on the side wall of the core to be measured and the circular top surface; among them, a radius measuring ruler 6 is arranged at a first connection position where the angle measurement plate is connected to the bottom panel. The radius measuring ruler is used to measure the radius length of the circular surface of the core to be measured. An angle measuring ruler 7 is arranged at a second connection position where the angle measurement plate is connected to the second baffle. The angle measuring ruler is used to measure the included angle between the radius formed by connecting the intersection points corresponding to each scale to the center of the circle and the hypotenuse. The intersection points refer to the points where the connecting lines formed by the intersections of each scale with the right-angle side of the angle measurement plate and the first baffle intersect the edge of the circular surface of the core to be measured.

[0036] Specifically, the material of the angle measuring plate is selected as a transparent material. The first baffle, the second baffle, and the bottom panel are all rectangular parallelepipeds. The first baffle and the second baffle have the same specifications. Among them, the length of the bottom panel in the first horizontal direction is equal to the sum of the upper limit scale of the radius measuring ruler and the lengths of the first baffle and the second baffle in the first horizontal direction. The width of the bottom panel in the second horizontal direction is equal to the sum of the upper limit scale of the length measuring ruler and the widths of the angle measuring plate and the auxiliary guide plate in the second horizontal direction. The heights of the first baffle and the second baffle in the vertical direction are equal to the heights of the angle measuring plate and the auxiliary guide plate in the vertical direction. The plane formed by the first horizontal direction and the second horizontal direction is perpendicular to the plane where the circular top surface is located. The plane formed by the first horizontal direction and the vertical direction is parallel to the plane where the circular top surface is located.

[0037] That is to say, as Figure 1 shown, set the origin o. The first horizontal direction refers to the direction where the x-axis is located. The second horizontal direction refers to the direction where the y-axis is located. The vertical direction refers to the direction where the z-axis is located. And the vertical direction is perpendicular to the horizontal plane where xoy is located. Moreover, the length of the bottom panel in the first horizontal direction is 32 cm (centimeters), the width in the second horizontal direction is 102 cm, and the thickness in the vertical direction is 1 cm. The first baffle and the second baffle have the same specifications. The length of the first baffle and the second baffle in the first horizontal direction is 1 cm, the width in the second horizontal direction is 102 cm, and the length in the vertical direction is 30 cm. And, the bottom sides of the first baffle and the second baffle parallel to the horizontal plane are both fixed on the top surface of the bottom panel. And the first baffle and the second baffle are arranged in parallel, and the vertical distance between the two is 30 cm, that is, the length of the bottom panel in the first horizontal direction minus the lengths of the first baffle and the second baffle in the first horizontal direction. That is to say, the side of the first baffle farthest from the second baffle and the side of the bottom panel farthest from the second baffle are on the same plane. The side of the second baffle farthest from the first baffle and the side of the bottom panel farthest from the first baffle are on the same plane.

[0038] Moreover, the angle measurement plate and the auxiliary guide rail plate have the same specifications. The vertical plane formed by the first horizontal direction and the vertical direction in the angle measurement plate and the auxiliary guide rail plate is triangular, and the vertical plane is perpendicular to the bottom plate and does not closely adhere to the first baffle and the second baffle. The side of the bottom plate formed by the first horizontal direction and the vertical direction and close to the angle measurement plate is on the same plane as the vertical plane of the angle measurement plate away from the auxiliary guide rail plate. The bottom surface formed by the first horizontal direction and the second horizontal direction in the angle measurement plate and the auxiliary guide rail plate is fixed on the bottom plate, and the side surface formed by the second horizontal direction and the vertical direction in the angle measurement plate and the auxiliary guide rail plate closely adheres to the second baffle. Furthermore, the length of the angle measurement plate and the auxiliary guide rail plate in the first horizontal direction is 30 cm, the width in the second horizontal direction is 1 cm, and the thickness in the vertical direction is 30 cm. That is to say, the vertical plane of the angle measurement plate and the auxiliary guide rail plate in the xoz plane is an isosceles right triangle, and the length of the right-angled side is 30 cm.

[0039] That is to say, the first baffle is fixed on the bottom plate along one side of the bottom plate in the second horizontal direction, the second baffle is fixed on the bottom plate along the other side of the bottom plate in the second horizontal direction, and the vertical plane of the angle measurement plate is an isosceles right triangle to control the center of the circular surface of the core to be measured to be on the hypotenuse of the isosceles right triangle. One right-angled side is fixed on the bottom plate along one side of the bottom plate in the first horizontal direction, and the other right-angled side is fixed on the side of the second baffle close to the first baffle.

[0040] Specifically, the radius measuring scale is arranged on the surface of the bottom plate close to the circular top surface and formed by the first horizontal direction and the vertical direction, and the angle measuring scale is arranged on the surface of the second baffle close to the circular top surface and formed by the first horizontal direction and the vertical direction. That is, as Figure 1 shown, the radius measuring scale 6 is arranged on the surface of the bottom plate formed by the first horizontal direction and the vertical direction, and this surface is on the same plane as the vertical plane of the angle measurement plate, and is engraved on one side of the bottom plate connected to the angle measurement plate 4; the angle measuring scale 7 is arranged on the surface of the second baffle formed by the first horizontal direction and the vertical direction, and this surface is on the same plane as the vertical plane of the angle measurement plate, and is engraved on one side of the second baffle connected to the angle measurement plate.

[0041] Specifically, each scale on the length measuring scale is used to mark the vertical distance from the circular top surface, each scale on the radius measuring scale is used to mark the vertical distance from the first baffle, and each scale on the angle measuring scale reflects the corresponding included angle through the vertical distance from the bottom plate.

[0042] Among them, the lower limit scale of the length measuring ruler is located on the side close to the angle measuring plate, and the upper limit scale of the length measuring ruler is located on the other side close to the auxiliary guide plate. The scale range of the length measuring ruler refers to the vertical distance from the zero mark to between the angle measuring plate and the auxiliary guide plate. Refer to Figure 3 , the scale range of the length measuring ruler provided by the embodiment of the present application is from 0 to 100 cm.

[0043] Among them, the lower limit scale of the radius measuring ruler is located on the side close to the first baffle, and the upper limit scale of the radius measuring ruler is located on the other side close to the second baffle. The scale range of the radius measuring ruler refers to the length from the zero mark to the right-angled side of the angle measuring plate. Exemplarily, refer to Figure 2 , the scale range of the radius measuring ruler provided by the embodiment of the present application is from 0 to 30 cm, that is, the radius range of the circular surface of the core to be measured is from 0 to 15 cm.

[0044] Please refer to Figure 4 , Figure 4 is a side view of the core fracture measuring device provided by the embodiment of the present application. As Figure 4 shown, the cylindrical core 9 to be measured is placed in the groove formed by the first baffle, the second baffle, the angle measuring plate, the auxiliary guide plate and the bottom plate, and the circular surface closest to the ground plane of the core to be measured is used as the circular top surface. The circular top surface is closely attached to the surface of the angle measuring plate in the groove, and the side wall of the core to be measured is closely attached to the surface of the first baffle in the groove. Furthermore, the vertical distance from any point on the side wall of the core to be measured to the circular top surface is measured by the length measuring ruler, the core radius of the circular top surface of the core to be measured is measured by the radius measuring ruler, and the included angle α is detected by the angle measuring ruler. And the scale on the angle measuring ruler is set according to the relationship between the included angle α and the vertical distance x from the bottom plate. For each scale on the angle measuring ruler, connect this scale with the zero scale of the radius measuring ruler, and then connect the intersection point between the connecting line and the edge of the circular top surface with the center of the circle to obtain the radius corresponding to this scale. Denote the included angle between the radius and the hypotenuse as the included angle corresponding to this scale. Furthermore, the lower limit scale of the angle measuring ruler is located on the side far from the bottom plate, the upper limit scale of the angle measuring ruler is located on the other side close to the bottom plate, and the scale range of the angle measuring ruler refers to the vertical distance from the zero mark to the preset included angle. The preset included angle refers to the included angle between the hypotenuse and the perpendicular line from a point on it to the bottom plate. Exemplarily, refer to Figure 2 , the scale range of the angle measuring ruler provided by the embodiment of the present application is from 0 to 135°.

[0045] Moreover, the material of the angle measurement plate is selected as a transparent material, and the angle measurement plate includes a plurality of angle measurement auxiliary lines. Each angle measurement auxiliary line is connected from the connection point of the angle measurement plate and the second baffle to the corresponding scale on the angle measurement ruler. That is, each scale on the angle measurement plate is connected to the zero scale of the radius measurement ruler to form the angle measurement auxiliary line corresponding to each scale. In addition, the plurality of angle measurement auxiliary lines on the radius measurement ruler include thick lines and thin lines. The thick lines represent the auxiliary lines corresponding to angles of every ten degrees, and the thin lines represent the auxiliary lines corresponding to angles with a units digit of five degrees. Moreover, the scales on the radius measurement ruler are set at intervals of 1 degree.

[0046] Exemplarily, referring to Figure 4 , the relationship between the included angle α corresponding to each scale and the vertical distance x from the bottom panel is described by the following formula: (1) In formula (1), R refers to the maximum core radius of the circular top surface of the core to be measured that can be measured by the device provided in the embodiments of the present application. According to the embodiments of the present application, R is 15 cm. refers to the included angle between the connecting line connecting the scale and the zero scale of the radius measurement ruler and the bottom panel. refers to the angle other than on the oblique angle of the isosceles triangle, and L refers to the length of the connecting line connecting the scale on the angle measurement ruler and the zero scale of the radius measurement ruler.

[0047] Please refer to Figure 5 . Figure 5 is a schematic diagram of the length measurement ruler provided in the embodiments of the present application. As Figure 5 shown, the length measurement ruler 8 is a cuboid. Sliding guide grooves are provided at the connection parts where the length measurement ruler is respectively connected to the angle measurement plate 4 and the auxiliary guide rail plate 5. The cuboid is vertically placed on the inclined plane formed by the hypotenuses of the triangles corresponding to the angle measurement plate and the auxiliary guide rail plate respectively. Sliding guide rails are provided on the hypotenuses of the triangles corresponding to the angle measurement plate and the auxiliary guide rail plate respectively. The sliding guide rails and the sliding guide grooves cooperate to enable the length measurement ruler to slide along the hypotenuse of the triangle on the inclined plane.

[0048] Exemplarily, the sliding guide rail is a convex guide rail, and the sliding guide groove is a concave guide groove. The convex guide rail and the concave guide groove cooperate through convex-concave fitting to enable the length measurement ruler to slide along the hypotenuse of the triangle on the inclined plane.

[0049] That is to say, by sliding the length measuring scale to drive the length measuring scale to slide along the inclined plane formed by the hypotenuses corresponding to the angle measuring plate and the auxiliary guide plate respectively, and during the sliding process, maintaining the distance between the connecting guide groove connecting the length measuring scale and the angle measuring plate and the second baffle equal to the distance between the connecting guide groove connecting the length measuring scale and the auxiliary guide plate and the second baffle, and fixing the core to be measured of the cylinder in the groove by sliding the length measuring scale.

[0050] Based on the same inventive concept, in the embodiments of the present application, a method for measuring the underground actual development parameters of core fractures corresponding to the core fracture measuring device provided in the above embodiments is also provided. Since the principle of solving problems of the underground actual development parameter measuring method in the embodiments of the present application is similar to that of the core fracture measuring device in the above embodiments of the present application, the implementation of the underground actual development parameter measuring method can refer to the implementation of the device, and the repeated parts will not be described again.

[0051] Exemplarily, the method for measuring the underground actual development parameters of core fractures provided in the embodiments of the present application includes the following steps: S101: Obtain the formation dip value of the core-taking interval where the core to be measured is located, and the true dip value of the formation marker layer on the core to be measured in the in-situ underground is equal to the formation dip value.

[0052] Specifically, the formation dip value of the core-taking interval is obtained by collecting and analyzing the geological information around the well. It is divided into two cases. Case one is for the high exploration degree area of oil and gas. By collecting 3D seismic data, connected well section data, adjacent well drilling data, etc. around the well area, draw the 3D contour map of the burial depth of the top or bottom surface of the core-taking interval, and obtain the formation dip information of the core-taking interval at the well location; Case two is for the low exploration degree area. Collect the 2D seismic profile or gravity-magnetic-electric profile or outcrop geological survey profile passing through the well, and combine the outcrop formation attitude data on the right side of the well area to draw the 2D profile of the burial depth of the top or bottom surface of the core-taking interval, and obtain the formation dip information of the core-taking interval at the well location.

[0053] That is to say, when the core-taking interval where the core to be measured is located is known, the formation dip value of the core-taking interval can be directly obtained by looking up the data.

[0054] Moreover, by identifying sedimentary laminations, rock bedding, etc. on the core to be measured, the formation marker layer of the core to be measured is determined. This type of marker layer is a natural interface formed during formation sedimentation and is parallel to the top or bottom surface of the overall formation. Furthermore, the true dip value of the formation marker layer identified on the core to be measured in the in-situ underground is equal to the formation dip value of the core-taking interval obtained.

[0055] S102: Place the core to be measured in the groove. By reading the scales of each point on the stratigraphic marker bed of the core to be measured on the length measuring scale, determine the highest point of the stratigraphic marker bed, and mark on the circular top surface the highest projection point of the stratigraphic marker bed that projects the highest point of the stratigraphic marker bed, the first projection diameter of the dip line corresponding to the stratigraphic marker bed passing through the highest projection point of the stratigraphic marker bed, and the lowest projection point of the stratigraphic marker bed.

[0056] Among them, the highest projection point of the stratigraphic marker bed refers to the point obtained by projecting the highest point of the stratigraphic marker bed along the length measuring scale towards the edge of the circular top surface. The first projection diameter refers to the diameter drawn on the circular top surface along the hypotenuse of the angle measuring plate passing through the highest projection point of the stratigraphic marker bed. The lowest projection point of the stratigraphic marker bed refers to the end point other than the highest projection point of the stratigraphic marker bed among the two end points of the first projection diameter.

[0057] That is to say, place the device flat on the ground or the operating table, place the core to be measured in the groove, and use the circular surface closest to the ground plane of the core to be measured as the circular top surface. The circular top surface is closely attached to the surface of the angle measuring plate in the groove, and the side wall of the core to be measured is closely attached to the surface of the first baffle in the groove. By sliding the length measuring scale, make the length measuring scale tangent to the side wall of the core to be measured.

[0058] Please refer to Figure 6 and Figure 7 shown in Figure 6 which is the top view of the device for projecting the stratigraphic marker bed provided by the embodiment of the present application, Figure 7 and the side view of the device for projecting the stratigraphic marker bed provided by the embodiment of the present application. As shown in Figure 6 the scale range of the length measuring scale is from 0 to 100 cm. By rotating the core to be measured, determine the scales of each point on the stratigraphic marker bed of the core to be measured on the length measuring scale. Take the point on the stratigraphic marker bed with the smallest scale as the highest point Q0 of the stratigraphic marker bed, and cracks A1 and A2 are also shown in the figure. As shown in Figure 6 and Figure 7 move the highest point of the stratigraphic marker bed along the length measuring scale towards the circular top surface and mark on the edge of the circular top surface the highest projection point Q of the stratigraphic marker bed projected by the highest point of the stratigraphic marker bed. At this time, the lowest projection point Q' of the stratigraphic marker bed naturally intersects with the hypotenuse of the angle measuring plate. And draw a straight line passing through the highest projection point Q along the long hypotenuse of the angle measuring plate with a marker pen to obtain the first projection diameter on the circular top surface. Take the first projection diameter as the projection line Q - Q' of the dip line corresponding to the stratigraphic marker bed on the cross-section of the core. Obviously, one end point of the first projection diameter is the highest projection point Q of the stratigraphic marker bed, and the other end point is the lowest projection point Q' of the stratigraphic marker bed.

[0059] S103: For each crack on the core to be measured, the highest point of the crack is determined by reading the scales on the length measuring ruler at each point on the side of the crack closest to the circular top surface, and the length value of the highest point of the crack on the length measuring ruler and the length value of the relative highest point of the crack on the other side of the crack corresponding to the highest point of the crack are recorded, and the highest projection point of the crack projected on the highest point of the crack, the second projection diameter of the trend line corresponding to the crack passing through the highest projection point of the crack and the lowest projection point of the crack are marked on the edge of the circular top surface, the core to be measured is rotated until the lowest projection point of the crack intersects with the length measuring ruler, and the length value of the lowest point of the crack on the side closest to the circular top surface at the time of intersection on the length measuring ruler and the length value of the relative lowest point of the crack on the other side of the crack corresponding to the lowest point of the crack are recorded.

[0060] Among them, the highest projection point of the crack refers to the point obtained by projecting the highest point of the crack along the length measuring ruler to the edge of the circular top surface, the second projection diameter refers to the diameter drawn on the circular top surface along the hypotenuse of the angle measuring plate passing through the highest projection point of the crack, and the lowest projection point of the crack refers to the endpoint other than the highest projection point of the crack among the two endpoints on the second projection diameter.

[0061] See also Figure 8 and Figure 9 As shown, Figure 8 A top view of a device for projecting cracks provided in an embodiment of the present application Figure 1 , Figure 9 This is a side view of a device for projecting cracks provided in an embodiment of the present application. Figure 8 As shown, the scale range of the length measuring ruler is from 0 to 100 cm. The core to be measured includes multiple cracks. The scale of each crack on the side close to the circular top surface on the length measuring ruler can be determined by rotating the core to be measured. The point with the smallest scale on the side of crack i is taken as the highest point A of crack i. i，0 and read the highest point A of the crack using a length measuring ruler i，0 The length value l i，1 , and read the highest point A of the crack by measuring the length i，0 The corresponding length l of the highest point of the crack on the other side of the crack i i，2 .like Figure 8 and Figure 9 As shown, the highest point A of the crack i，0 The highest projection point A of the crack is obtained by projecting along the length measuring ruler to the edge of the circular top surface i, and draw a straight line passing through the highest projection point A of the crack along the oblique long side of the angle measuring plate with a marker pen i At this time, the highest projection point A of the crack i naturally intersects with the hypotenuse of the angle measuring plate, obtaining the second projection diameter located on the circular top surface. Take the second projection diameter as the projection line A of the dip line corresponding to the crack i on the core cross-section i -A i ', and mark the other end point corresponding to the highest projection point A of the crack on the second projection diameter as the lowest projection point A of the crack i '. i

[0062] Please refer to Figure 10 shown in Figure 10 the top view of the device for projecting cracks provided by the embodiment of the present application Figure 2 . As Figure 10 shown, the scale range of the length measuring ruler is from 0 to 100 cm. By rotating the core to be measured, rotate the lowest projection point A of the crack i ' to the position where it intersects with the length measuring ruler, and mark the position where the side of the crack i close to the circular top surface intersects with the length measuring ruler as the lowest point of the crack, and record the scale of the lowest point of the crack on the length measuring ruler as the length value l of the lowest point of the crack i，3 , and read the length value l of the relative lowest point of the crack on the other side of the crack i corresponding to the lowest point of the crack through the length measuring ruler i，4 . Furthermore, record the length value l of the highest point of the crack i i，1 , the length value l of the relative highest point of the crack i，2 , the length value l of the lowest point of the crack i，3 and the length value l of the relative lowest point of the crack i，4 .

[0063] S104: For each crack on the core to be measured, read the dip angle between the second projection diameter corresponding to the crack and the first projection diameter through the angle measuring plate, and determine the true crack dip value of the crack in-situ underground according to the dip angle and the true dip value, and mark the intersection point between the second projection diameter and the first projection diameter as the center of the circle of the circular top surface and read the core radius of the core to be measured through the radius measuring ruler.

[0064] Exemplarily, as Figure 9 shown, read the dip angle i -A i ' of the second projection diameter corresponding to the crack i and the first projection diameter Q-Q' through the angle measuring auxiliary line on the angle measuring plate , which can be understood as taking the second projection diameter Ai - A i The angle rotated from '-A' clockwise to the first projected diameter Q-Q'. And, the sum of the dip angle and the true dip value is taken as the true fracture dip value of fracture i in-situ underground . When the sum of the dip angle and the true dip value is greater than 360°, it is also necessary to subtract 360° from the sum of the dip angle and the true dip value to obtain the true fracture dip value

[0065] Exemplarily, when the dip angle ≤135°, rotate the second projected diameter A i - A i ' until it coincides with the hypotenuse, and the highest projected point A of the fracture intersects with the length measuring scale. Directly read the scale value corresponding to the angle measuring auxiliary line intersected by the Q-Q' line on the angle measuring scale, and take this scale value as the dip angle i ; when 135° < ≤180°, first rotate the first projected diameter Q-Q' until it coincides with the hypotenuse, and the highest projected point Q of the formation marker bed intersects with the length measuring scale. Then rotate the first projected diameter Q-Q' counterclockwise 135° from the coincidence with the hypotenuse, that is, at this time the first projected diameter Q-Q' is perpendicular to the bottom panel. Mark an auxiliary diameter along the hypotenuse on the circular top surface of the core to be measured. Then rotate the core to be measured clockwise so that the second projected diameter A i -A i ' coincides with the hypotenuse, and the highest projected point A of the fracture intersects with the length measuring scale. Then read the scale value of the auxiliary diameter at this time on the angle measuring scale through the angle measuring auxiliary line, and add 135° to the scale value read at this time to obtain ; if > 180°, then directly rotate the second projected diameter A i i -A i ' until it coincides with the hypotenuse and read the scale value of the first projected diameter Q-Q' at this time on the angle measuring scale through the angle measuring auxiliary line, that is, read the scale value of the angle measuring auxiliary line intersected by the lowest projected point Q' of the formation marker bed in the first projected diameter Q-Q' at this time, and add 180° to this scale value to obtain .

[0066] Furthermore, mark the intersection point O between the first projected diameter and the second projected diameter as the center of the circular top surface. In this way, read the scale corresponding to the center through the radius measuring scale to obtain the core radius r of the core to be measured

[0067] S105: For each crack on the core to be measured, based on the core radius, the length value of the highest point of the crack, the length value of the relative highest point of the crack, the length value of the lowest point of the crack, and the length value of the relative lowest point of the crack, determine the true length, true dip angle, and true maximum aperture of the crack in-situ underground.

[0068] Exemplarily, please refer to Figure 11 , Figure 11 which is a schematic diagram of the crack state parameters provided by the embodiments of the present application. Figure 1 . As Figure 11 shown, the wide side of the rectangle in the figure can be understood as the diameter 2r of the circular top surface of the core to be measured, and the long side of the rectangle can be understood as the vertical distance between the two circular surfaces of the core to be measured measured by the length measuring scale. The black solid line at the top of the figure represents the circular top surface of the core to be measured. For one long side of the rectangle, starting from the circular top surface of the core to be measured, intercept downward and . For the other long side of the rectangle, starting from the circular top surface of the core to be measured, intercept downward and . The difference between and can be understood as the crack width closest to the circular top surface on crack i, The difference between

[0069] Among them, the true length of the crack in-situ underground is calculated by the following formula: (2) In formula (2), refers to the true length of crack i in-situ underground, r refers to the core radius of the core to be measured, refers to the length value of the highest point A i，0 of crack i, refers to the length value of the relative highest point of the crack, refers to the length value of the lowest point of the crack, refers to the length value of the relative lowest point of the crack.

[0070] Among them, the true dip angle of the crack in-situ underground is calculated by the following formula: (3) In formula (3), refers to the true dip angle of crack i in-situ underground, r refers to the core radius of the core to be measured, refers to the length value of the highest point of crack i, Refers to the length value relative to the highest point of the crack, Refers to the length value of the lowest point of the crack, Refers to the length value relative to the lowest point of the crack.

[0071] Exemplarily, please refer to Figure 12 , Figure 12 which is a schematic diagram of the crack state parameters provided by the embodiments of the present application. Figure 2 As shown in Figure 12 , when the crack width closest to the circular top surface on crack i is greater than or equal to the crack width farthest from the circular top surface on crack i, the calculation method of the true maximum opening is different from that when the crack width closest to the circular top surface on crack i is less than the crack width farthest from the circular top surface on crack i.

[0072] Among them, the true maximum opening of the crack in-situ underground is calculated by the following formula: (4) In formula (4), Refers to the true maximum opening of crack i in-situ underground. The true maximum opening serves as one of the right-angled sides of a right-angled triangle, and the angle opposite the true maximum opening in this right-angled triangle is denoted as , r refers to the core radius of the core to be measured, Refers to the length value of the highest point of crack i, Refers to the length value relative to the highest point of the crack, Refers to the length value of the lowest point of the crack, Refers to the length value relative to the lowest point of the crack.

[0073] S106: For each crack on the core to be measured, determine the proportion of the crack space volume of this crack in the crack space of the core to be measured according to the core radius, the core length of the core to be measured, the length value of the highest point of this crack, the length value relative to the highest point of the crack, the length value of the lowest point of the crack, and the length value relative to the lowest point of the crack.

[0074] Specifically, the proportion of the crack space volume of the crack in-situ underground is calculated by the following formula:

[0075] In formula (5), Refers to the proportion of the crack space volume of crack i in-situ underground, Refers to the volume of the core to be measured where crack i is located, refers to the crack space volume of crack i in-situ underground. H refers to the length of the core to be measured in the second horizontal direction, that is, the vertical distance between the two circular faces of the core to be measured. r refers to the core radius of the core to be measured. refers to the length value of the highest point of crack i. refers to the length value relative to the highest point of the crack. refers to the length value of the lowest point of the crack. refers to the length value relative to the lowest point of the crack.

[0076] Furthermore, for each crack in the core to be measured, the true crack dip value, true length, true dip angle, true maximum aperture, and crack space volume ratio of each crack in-situ underground are determined by the above method, and the true crack dip value, true length, true dip angle, true maximum aperture, and crack space volume ratio are used as the crack development degree parameters. In this way, for the cores at other depths of the stratigraphic horizon where the core to be measured is located, the above method is also used to measure and calculate each parameter to complete the crack measurement and calculation for all cores in the same stratigraphic horizon. Furthermore, for the cores in different stratigraphic horizons of the same drilling run as the core to be measured (the core size is the same as that of the core to be measured), the above crack development degree parameters can be calculated to complete the crack measurement and calculation for all cores in the same drilling run. The crack measurement and calculation for all cores in the entire drilling run can also be completed by calculating the above parameters for each core in different drilling runs different from the core to be measured (the core size is different from that of the core to be measured). And the core radius, formation dip value, true dip value, and the length values of the highest points of each crack, the length values relative to the highest points of the cracks, the length values of the lowest points of the cracks, and the length values relative to the lowest points of the cracks measured from the cores obtained at different drilling runs, different stratigraphic horizons, and different depths of the entire well, as well as the calculated included angle of the crack trend line, true length, true dip angle, true maximum aperture, crack space volume, and crack space volume ratio of each crack are used as the true evaluation parameters of each crack, so as to use the true evaluation parameters of all single-well core cracks involved as the true evaluation parameter database of single-well core cracks in-situ underground.

[0077] Among them, the method further includes: dividing each crack in the core to be measured into multiple intervals according to the true crack dip value and the true dip angle of each crack; calculating the cumulative value of the crack space volume ratio of all cracks in each interval to reflect the crack development degree of different intervals through the cumulative value.

[0078] Furthermore, according to the research needs, the secondary, stratigraphic and depth segments can be distinguished to count the fracture development degree of different attitudes, and a spatial distribution map of the fracture development degree can be made to visually evaluate the spatial development law of the fractures. That is to say, multiple intervals are divided according to the research accuracy requirements. Please refer to Figure 13 , Figure 13 which is the spatial distribution map of the fracture development degree provided by the embodiment of the present application. As Figure 13 shown, the circumferential degree represents the fracture trend, the 0° to 360° is divided into 36 fracture trend intervals, the radius scale represents the fracture dip angle, the 0° to 90° is divided into 9 fracture dip angle intervals, so as to construct 324 intervals. Furthermore, according to the true fracture trend value and true dip angle of each fracture in a certain fracture depth interval, the interval to which each fracture belongs is planned, and the number of fractures in each interval is counted, so as to calculate the cumulative value of the fracture space volume ratio of all fractures in each interval, and the size of the cumulative value is characterized by the different shades of the same color system. And, the cumulative value of the fracture space volume ratio is used to reflect the true storage space of the fractures, that is, the larger the cumulative value, the more true storage space of the fractures, and the more resources can be stored. Furthermore, the fracture development degree of different intervals is comprehensively characterized, and finally a spatial distribution map of the fracture development degree in the research depth interval is formed, so as to visually and comprehensively quantitatively evaluate the in-situ true development degree of the core fractures, and thus conduct a multi-dimensional comprehensive and refined evaluation of the effectiveness of the fracture reservoir.

[0079] Furthermore, the core fracture parameter measurement method provided by this application can most intuitively and accurately reflect the true occurrence and development degree of underground fractures. Compared with other measurement and prediction methods, it has the advantages of being directly measurable on-site, convenient and fast, true and effective, high precision, and low dependence on preliminary work, and is currently the most widely used. Moreover, it overcomes the disadvantages of the existing direct core fracture measurement method, such as inconvenient operation, low measurement accuracy, and inability to restore the true in-situ occurrence and development parameters of fractures underground. Through the device of the present invention, relevant parameters of fracture development can be accurately measured, and the true in-situ dip, dip angle, length, maximum aperture, etc. of fractures can be calculated and restored through the measured parameters, providing a true data basis for fracture evaluation. In addition, through the non-equidistant angle measurement module and the slidable length measurement module, the measurement of cores of any size and any length within the industry standard range can be satisfied, and the measurement and evaluation of cores taken from different well types, different opening times, and different well numbers can be realized. Moreover, the equipment structure is relatively simple, easy to manufacture, easy to carry, with good economy and field practicality. Compared with complex geophysical fracture evaluation methods such as imaging logging, it is not restricted by factors such as the degree of oil and gas exploration, the abundance of data, the type and size of drilling, and has the advantages of lower implementation cost, wider application range, higher measurement accuracy, and faster evaluation speed. And the technical solution of this application forms an effective fracture evaluation method based on the contribution rate of the reservoir space based on the true parameters of the underground in-situ fractures, overcomes the disadvantages of the existing single-element fracture development degree evaluation method, and realizes the multi-dimensional comprehensive quantitative evaluation of the fracture development degree in space that can simultaneously characterize three parameters, namely, dip, dip angle, and the cumulative value of the proportion of the fracture space volume.

[0080] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces, and the indirect coupling or communication connection of the devices or units may be in an electrical, mechanical, or other form.

[0081] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0082] In addition, in each embodiment of the present application, each functional unit may be integrated into one processing unit, may exist physically alone for each unit, or two or more units may be integrated into one unit.

[0083] If the above-mentioned function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: various media that can store program codes such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs.

[0084] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A core fracture measurement device, characterized in that, The core fracture measurement device includes: A bottom panel; A first baffle and a second baffle, the bottom edges of the first baffle and the second baffle are vertically arranged above the top surface of the bottom panel, and the first baffle and the second baffle are arranged in parallel; An angle measurement plate and an auxiliary guide rail plate, the angle measurement plate and the auxiliary guide rail plate are arranged in parallel between the first baffle and the second baffle. The angle measurement plate and the auxiliary guide rail plate have the same specifications and the vertical surfaces that are perpendicular to the bottom panel and not in contact with the baffles are both triangular. Among them, the first baffle, the second baffle, the angle measurement plate and the auxiliary guide rail plate enclose a rectangle on the bottom panel and form a groove with the bottom panel. The groove is used to place a cylindrical core to be measured. The circular top surface of the core to be measured is in contact with one surface of the angle measurement plate located in the groove, and the side wall of the core to be measured is in contact with one surface of the first baffle located in the groove, and the center of the circular top surface is maintained at the hypotenuse of the triangle. The circular top surface refers to the circular surface of the core to be measured that is closest to the ground plane; A length measuring ruler, the length measuring ruler is arranged on the hypotenuses corresponding to the angle measurement plate and the auxiliary guide rail plate respectively, and is slidably connected to the hypotenuse and slides along the direction of the hypotenuse. The length measuring ruler is used to measure the vertical distance between each point on the side wall of the core to be measured and the circular top surface; Among them, a radius measuring ruler is arranged at the first connection position where the angle measurement plate is connected to the bottom panel. The radius measuring ruler is used to measure the radius length of the circular surface of the core to be measured. An angle measuring ruler is arranged at the second connection position where the angle measurement plate is connected to the second baffle. The angle measuring ruler is used to measure the included angle between the radius formed by connecting the intersection points corresponding to each scale to the center of the circle and the hypotenuse. The intersection point refers to the point where the connecting line formed by the connecting points of each scale and the right-angle side of the angle measurement plate and the first baffle intersects the edge of the circular surface of the core to be measured; 2. The core fracture measurement device according to claim 1, characterized in that, Each scale on the length measuring ruler is used to mark the vertical distance from the circular top surface. Each scale on the radius measuring ruler is used to mark the vertical distance from the first baffle. Each scale of the angle measuring ruler reflects the corresponding included angle through the vertical distance from the bottom panel; Among them, the angle measurement plate includes a plurality of angle measurement auxiliary lines, and each angle measurement auxiliary line is connected from the connection point of the angle measurement plate and the second baffle to the scale corresponding to the angle measurement auxiliary line on the angle measuring ruler; 3. The core fracture measurement device according to claim 1 or 2, characterized in that The lower limit scale of the length measuring ruler is located on the side close to the angle measurement plate, and the upper limit scale of the length measuring ruler is located on the other side close to the auxiliary guide rail plate. The scale range of the length measuring ruler refers to the zero mark to the vertical distance between the angle measurement plate and the auxiliary guide rail plate; The lower limit scale of the radius measuring ruler is located on the side close to the first baffle, and the upper limit scale of the radius measuring ruler is located on the other side close to the second baffle. The scale range of the radius measuring ruler refers to the length from the zero mark to the right-angle side of the angle measuring plate. The lower limit scale of the angle measuring ruler is located on the side away from the bottom panel, and the upper limit scale of the angle measuring ruler is located on the other side close to the bottom panel. The scale range of the angle measuring ruler refers to the length from the zero mark to a preset included angle, and the preset included angle refers to the included angle between the hypotenuse and the perpendicular line drawn from a point on it to the bottom panel.

4. The core fracture measurement device according to claim 1, characterized in that, The material of the angle measuring plate is selected as a transparent material. The first baffle, the second baffle, and the bottom panel are all cuboids, and the first baffle and the second baffle have the same specifications. Among them, the length of the bottom panel in the first horizontal direction is equal to the sum of the upper limit scale of the radius measuring ruler and the lengths of the first baffle and the second baffle in the first horizontal direction. The width of the bottom panel in the second horizontal direction is equal to the sum of the upper limit scale of the length measuring ruler and the widths of the angle measuring plate and the auxiliary guide rail plate in the second horizontal direction. The heights of the first baffle and the second baffle in the vertical direction are equal to the heights of the angle measuring plate and the auxiliary guide rail plate in the vertical direction. The plane formed by the first horizontal direction and the second horizontal direction is perpendicular to the plane where the circular top surface is located, and the plane formed by the first horizontal direction and the vertical direction is parallel to the plane where the circular top surface is located.

5. The core fracture measurement device according to claim 4, characterized in that, The radius measuring ruler is arranged on the side of the bottom panel close to the circular top surface and formed by the first horizontal direction and the vertical direction, and the angle measuring ruler is arranged on the side of the second baffle close to the circular top surface and formed by the first horizontal direction and the vertical direction.

6. The core fracture measurement device according to claim 1, characterized in that, The length measuring ruler is a cuboid. Sliding guide grooves are provided at the joints where the length measuring ruler is respectively connected to the angle measuring plate and the auxiliary guide rail plate. The cuboid is vertically placed on the inclined plane formed by the hypotenuses of the triangles corresponding to the angle measuring plate and the auxiliary guide rail plate respectively. Sliding guide rails are provided on the hypotenuses of the triangles corresponding to the angle measuring plate and the auxiliary guide rail plate respectively. The sliding guide rails and the sliding guide grooves cooperate to enable the length measuring ruler to slide along the hypotenuse of the triangle on the inclined plane.

7. The core fracture measurement device according to claim 6, characterized in that, The sliding guide rail is an outward convex guide rail, and the sliding guide groove is an inward concave guide groove. The outward convex guide rail and the inward concave guide groove cooperate through convex-concave fitting to enable the length measuring ruler to slide along the hypotenuse of the triangle on the inclined plane.

8. A method for measuring the actual underground development parameters of core fractures, characterized in that, The method is applied to the device according to any one of claims 1 to 7. The method includes: Obtaining the formation dip value of the coring interval where the core to be measured is located, and the true dip value of the formation marker layer on the core to be measured in the in-situ underground is equal to the formation dip value. Place the core to be measured in the groove. By reading the scales of each point on the stratigraphic marker bed of the core to be measured on the length measuring scale, determine the highest point of the stratigraphic marker bed, and mark on the circular top surface the highest projection point of the stratigraphic marker bed that projects the highest point of the stratigraphic marker bed, the first projection diameter of the dip line corresponding to the stratigraphic marker bed passing through the highest projection point of the stratigraphic marker bed, and the lowest projection point of the stratigraphic marker bed; For each crack on the core to be measured, by reading the scales of each point on the side of the crack closest to the circular top surface on the length measuring scale, determine the highest point of the crack, and record the length value of the highest point of the crack on the length measuring scale and the length value of the relative highest point of the crack corresponding to the highest point of the crack on the other side of the crack. And mark on the edge of the circular top surface the highest projection point of the crack that projects the highest point of the crack, the second projection diameter of the dip line corresponding to the crack passing through the highest projection point of the crack, and the lowest projection point of the crack. Rotate the core to be measured until the lowest projection point of the crack intersects with the length measuring scale, and record the length value of the lowest point of the crack on the side closest to the circular top surface at the intersection and the length value of the relative lowest point of the crack corresponding to the lowest point of the crack on the other side of the crack; For each crack on the core to be measured, read the dip angle between the second projection diameter corresponding to the crack and the first projection diameter through the angle measuring plate, and determine the true crack dip value of the crack in-situ underground according to the dip angle and the true dip value, and mark the intersection point between the second projection diameter and the first projection diameter as the center of the circular top surface and read the core radius of the core to be measured through the radius measuring scale; For each crack on the core to be measured, determine the true length, true dip angle and true maximum opening of the crack in-situ underground based on the core radius, the length value of the highest point of the crack, the length value of the relative highest point of the crack, the length value of the lowest point of the crack, and the length value of the relative lowest point of the crack; For each crack on the core to be measured, determine the proportion of the crack space volume of the crack in the core to be measured according to the core radius, the core length of the core to be measured, the length value of the highest point of the crack, the length value of the relative highest point of the crack, the length value of the lowest point of the crack, and the length value of the relative lowest point of the crack; 9. The method according to claim 8, wherein The highest projection point of the stratigraphic marker bed refers to the point obtained by projecting the highest point of the stratigraphic marker bed along the length measuring scale towards the edge of the circular top surface. The first projection diameter refers to the diameter drawn on the circular top surface along the hypotenuse of the angle measuring plate passing through the highest projection point of the stratigraphic marker bed. The lowest projection point of the stratigraphic marker bed refers to the end point other than the highest projection point of the stratigraphic marker bed among the two end points of the first projection diameter; The highest projection point of the crack refers to the point obtained by projecting the highest point of the crack along the length measuring scale towards the edge of the circular top surface. The second projection diameter refers to the diameter drawn on the circular top surface along the hypotenuse of the angle measuring plate and passing through the highest projection point of the crack. The lowest projection point of the crack refers to the end point other than the highest projection point of the crack among the two end points on the second projection diameter.

10. The method according to claim 8, wherein, The method further includes: Dividing each crack into multiple intervals according to the true crack dip value and the true dip angle of each crack in the core to be measured; Calculating the cumulative value of the proportion of the crack space volume of all cracks in each interval, so as to reflect the crack development degree of different intervals through the cumulative value.

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