Core fracture measurement device and underground actual development parameter measurement method

Abstract

The present application provides a core fracture measurement device and a method for measuring actual underground development parameters, wherein the device includes: a bottom plate; a first baffle and a second baffle, the bottom edges of the first baffle and the second baffle are both vertically arranged above the top surface of the bottom plate, and the first baffle and the second baffle are arranged in parallel; an angle measuring plate and an auxiliary guide plate, the angle measuring plate and the auxiliary guide plate are parallelly arranged between the first baffle and the second baffle, the angle measuring plate and the auxiliary guide plate have the same specifications and are perpendicular to the bottom plate but not closely attached to the vertical surface of the baffle; a length measuring ruler, the length measuring ruler is arranged on the hypotenuse of the triangle corresponding to the angle measuring plate and the auxiliary guide plate, and is slidably connected to the hypotenuse and slides along the direction of the hypotenuse, and 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.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas exploration and development, and in particular 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, especially in unconventional reservoirs with ultra-low porosity and permeability, such as shale reservoirs, tight reservoirs, and carbonate reservoirs. The higher the development of fractures, the more significant the increase in oil and gas production, doubling the oil and gas production capacity of a single well. Fractures have become a key target for finding oil and gas sweet spots in today's oil and gas exploration. Currently, the evaluation of fractures in oil and gas reservoirs requires accurate in-situ information on the true strike, dip, and inclination of underground fractures, as well as information on their development level, such as length, aperture, and density. The timeliness, convenience, and accuracy of obtaining these parameters are crucial for optimizing oil and gas reservoir evaluation, designing fracturing and testing plans, deploying development and production well networks, and planning oil and gas production capacity.

[0003] Currently, methods for obtaining fracture parameters and evaluating the development of oil and gas reservoirs primarily include core fracture measurement, seismic data fracture prediction, well logging data fracture calculation, geostress fracture distribution prediction, and well test data fracture inverse calculation. Of these methods, core fracture measurement offers the most intuitive and accurate representation of the true occurrence and development of subsurface fractures. Compared to other measurement and prediction methods, it offers advantages such as direct on-site measurement, convenience, effectiveness, high accuracy, and minimal reliance on preliminary work, making it the most widely used. Core fracture measurement primarily involves visually observing cores and directly measuring fracture information with tools such as rulers and protractors. This method obtains parameters such as core fracture length, aperture, angle, and density, addressing practical challenges in fracture reservoir evaluation to a certain extent. However, this method currently has many problems: (1) During the coring process, the drill string 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; (2) Since it is impossible to read the true in-situ dip, 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 apparent opening of the fracture in the core can be roughly estimated, and the true length and opening 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 true reservoir space contribution rate 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 actual occurrence and development parameters of the fractures underground through resistivity imaging logging, and then calibrate the core fractures. Although this method can relatively accurately obtain the real information of the fractures underground, 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 has a limited scope of application. (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 three-dimensional seismic data and multiple well logging data. It is not applicable to low-exploration areas that lack seismic data 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 three-dimensional CT scanning of cores. This method can accurately obtain parameters such as the length and opening of core fractures, but it still cannot achieve the measurement of the actual underground tendency and inclination of fractures, and a small amount of cores need to be retrieved from the site to the laboratory for operation. The operation is complicated, time-consuming, labor-intensive, and expensive. For drilling with full-section coring (cumulative core length > 1000m), it is difficult to achieve three-dimensional scanning of the entire section. This method is a good scientific research method, but its production timeliness and practicality are poor; (4) By observing the development parameters of microcracks in the core through microscopic thin sections, scanning electron microscopes, etc., a quantitative relationship model between microcracks and macrocracks is established to predict the development degree of cracks. This type of method still cannot achieve the measurement of crack tendency and inclination. Moreover, due to the small sample size, the measurement of crack length, aperture, and density is relatively limited and cannot reflect the overall picture, and the accuracy of the predicted crack 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 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:

[0007] 14. The repairing kit for automotive dents, according to claim 13, wherein the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The through-hole, the bosses comprise a through-hole, a screw bolt, and a nut. The through-hole, the bosses comprise a through-hole, a screw bolt, and a nut. The hypotenuse of the triangle, the circular top surface refers to a circular surface closest to the ground plane in the rock core to be measured; a length measuring ruler, the length measuring ruler is arranged on the hypotenuse of the triangle corresponding to the angle measuring plate and the auxiliary guide 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 rock core to be measured and the circular top surface; wherein, a radius measuring ruler is provided at a first connection position where the angle measuring plate is connected to the bottom plate, the radius measuring ruler is used to measure the radius length of the circular surface of the rock core to be measured, and an angle measuring ruler is provided at a second connection position where the angle measuring plate is connected to the second baffle, the angle measuring ruler is used to measure the angle between the radius formed by connecting the center of the circle corresponding to the intersection points of each scale and the hypotenuse, the intersection point refers to the point where the connecting line formed by each scale and the connection point between a right angle side of the angle measuring plate and the first baffle intersects on the edge of the circular surface of the rock core to be measured.

[0008] 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, and each scale on the angle measuring ruler reflects the corresponding included angle through the vertical distance from the bottom plate, wherein the angle measurement plate includes a plurality of angle measurement auxiliary lines, each angle measurement auxiliary line is connected from the connection point between the angle measurement plate and the second baffle to the scale corresponding to the angle measurement auxiliary line on the angle measurement ruler.

[0009] Optionally, 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 rail 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 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-angled 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 distance from the zero mark to a preset angle. The preset angle refers to the angle between the hypotenuse and a point on it perpendicular to the bottom panel.

[0010] Optionally, the angle measuring plate is made of 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, wherein 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 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 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.

[0011] Optionally, the radius measuring ruler is arranged on a surface 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 a surface of the second baffle close to the circular top surface and formed by the first horizontal direction and the vertical direction.

[0012] Optionally, the length measuring ruler is a rectangular parallelepiped, and sliding guide grooves are provided at the connections where the length measuring ruler is connected to the angle measuring plate and the auxiliary guide rail plate respectively. The rectangular parallelepiped is placed vertically on an 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 on the inclined plane along the hypotenuses of the triangles.

[0013] Optionally, the sliding guide rail is an outward convex guide rail, and the sliding guide groove is an inward concave guide groove, and the outward convex guide rail and the inward concave guide groove achieve sliding of the length measuring ruler along the hypotenuse of the triangle on the inclined plane through convex-concave cooperation.

[0014] In a second aspect, an embodiment of the present application further provides a method for measuring the actual underground development parameters of core fractures, the method being applied to the equipment described in the first aspect or any possible embodiment of the first aspect, the method comprising: obtaining the formation inclination value of the coring layer section where the core to be measured is located, and the actual inclination value of the formation marker layer on the core to be measured located in situ underground is equal to the formation inclination value; placing the core to be measured in the groove, determining the highest point of the formation marker layer by reading the scales of each point on the formation marker layer of the core to be measured on the length measuring ruler, and marking the highest projection point of the formation marker layer projected for the highest point of the formation marker layer, the formation marker layer passing through the formation marker layer on the circular top surface. The first projection diameter of the trend line corresponding to the formation marker layer at the highest projection point of the marker layer and the lowest projection point of the formation marker layer; for each crack on the rock 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 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 for 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, and the rock core to be measured is rotated. Until the lowest projection point of the crack intersects with the length measuring ruler, record the length value of the lowest point of the crack on the side closest to the circular top surface on the length measuring ruler at the time of intersection 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; for each crack on the core to be measured, read the angle between the second projection diameter and the first projection diameter corresponding to the crack through the angle measuring plate, and determine the true crack in-situ value of the crack according to the angle and the true inclination 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 radius through the radius measuring ruler. Take the core radius of the core to be measured; for each crack on the core to be measured, determine the true length, true inclination 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 in the crack space volume of the core to be measured based on 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.

[0015] Optionally, the highest projection point of the formation marker layer refers to the point obtained by projecting the highest point of the formation marker layer along the length measuring ruler to the edge of the circular top surface, the first projection diameter refers to the diameter drawn along the hypotenuse of the angle measuring plate on the circular top surface passing through the highest projection point of the formation marker layer, and the lowest projection point of the formation marker layer refers to the endpoint of the two endpoints of the first projection diameter except the highest projection point of the formation marker layer; 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 along the hypotenuse of the angle measuring plate on the circular top surface passing through the highest projection point of the crack, and the lowest projection point of the crack refers to the endpoint of the two endpoints on the second projection diameter except the highest projection point of the crack.

[0016] Optionally, the method further includes: dividing each fracture in the rock core to be tested into multiple intervals according to the true fracture inclination value and the true inclination of each fracture; calculating the cumulative value of the fracture space volume proportion of all fractures in each interval, so as to reflect the degree of fracture development in different intervals through the cumulative value.

[0017] The embodiment of the present application provides a core crack measurement device and an underground actual development parameter measurement method, the device comprising: a bottom panel; a first baffle and a second baffle, the bottom edges of the first baffle and the second baffle are both vertically arranged on the top surface of the bottom panel, and the first baffle and the second baffle are arranged in parallel; an angle measuring plate and an auxiliary guide plate, the angle measuring plate and the auxiliary guide plate are parallelly arranged between the first baffle and the second baffle, the specifications of the angle measuring plate and the auxiliary guide plate are the same and the vertical surfaces perpendicular to the bottom panel but not close to the baffle are both set as triangles, wherein the first baffle, the second baffle, the angle measuring plate and the auxiliary guide plate are surrounded by 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 close to the side of the angle measuring plate located in the groove and the side wall of the core to be measured is close to the side of the first baffle located in the groove, and the circular top surface is maintained. The center is located on the hypotenuse of the triangle, and the circular top surface refers to a circular surface closest to the ground plane in the rock core to be measured; a length measuring ruler is arranged on the hypotenuse of the triangle corresponding to the angle measuring plate and the auxiliary guide plate respectively, and is slidably connected to the hypotenuse and slides along the direction of the hypotenuse, and the length measuring ruler is used to measure the vertical distance between each point on the side wall of the rock core to be measured and the circular top surface; wherein, a radius measuring ruler is provided at a first connection position where the angle measuring plate is connected to the bottom plate, and the radius measuring ruler is used to measure the radius length of the circular surface of the rock core to be measured; a second connection position where the angle measuring plate is connected to the second baffle is provided with an angle measuring ruler, and the angle measuring ruler is used to measure the angle between the radius formed by connecting the center of the circle corresponding to the intersection points of each scale and the hypotenuse, and the intersection point refers to the point where the connecting line formed by each scale and the connection point between a right angle side of the angle measuring plate and the first baffle intersects on the edge of the circular surface of the rock core to be measured. The core fracture measurement equipment is used to measure multiple development parameters of core samples, which solves the technical problem of being unable to accurately measure the development degree of core fractures, achieving the technical effect of reducing measurement costs and increasing measurement accuracy.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of a core fracture measurement device provided in an embodiment of the present application is shown.

[0021] Figure 2 A side view of a core fracture measurement device provided in an embodiment of the present application is shown.

[0022] Figure 3 A top view of a core fracture measurement device provided in an embodiment of the present application is shown.

[0023] Figure 4 A side view of a core fracture measurement device provided in an embodiment of the present application is shown.

[0024] Figure 5 A schematic diagram of a length measuring ruler provided in an embodiment of the present application is shown.

[0025] Figure 6 A top view of a device for projecting a stratum marker layer provided in an embodiment of the present application is shown.

[0026] Figure 7 A side view of a device for projecting a stratum marker layer provided in an embodiment of the present application is shown.

[0027] Figure 8 The top view of the device for projecting cracks provided by the embodiment of the present application is shown. Figure 1 .

[0028] Figure 9 A side view of a device for projecting cracks provided by an embodiment of the present application is shown.

[0029] Figure 10 The top view of the device for projecting cracks provided by the embodiment of the present application is shown. Figure 2 .

[0030] Figure 11 Schematic diagram showing the crack state parameters provided by the embodiment of the present application Figure 1 .

[0031] Figure 12 Schematic diagram showing the crack state parameters provided by the embodiment of the present application Figure 2 .

[0032] Figure 13 The figure shows the spatial distribution of the degree of fracture development provided by the embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of illustration and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps without logical context can be reversed or implemented simultaneously. In addition, those skilled in the art, under the guidance of the contents of this application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0034] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0035] Existing methods for measuring core development parameters through resistivity imaging logging, seismic-logging-core relationship models, three-dimensional CT core scanning, and quantitative relationship models between micro- and macro-fractures are all costly and difficult to apply to all cores collected by logging. Furthermore, fracture development is often assessed by counting the number of fractures per unit length or unit area to determine fracture linear density, surface density, and fracture spacing. Simultaneously, methods such as fracture parameter frequency distribution diagrams, fracture rosettes, and fracture density maps are used to evaluate fracture development in different orientations or at different angles. These methods can only characterize one or two of the following parameters: dip, inclination, and density. These methods are unable to effectively evaluate fractures based on reservoir space contribution, nor can they achieve a multidimensional, comprehensive evaluation of fracture development that simultaneously characterizes all three parameters: dip, inclination, and effectiveness.

[0036] Based on this, the embodiments of the present application provide a core fracture measurement device and a method for measuring actual underground development parameters. The core fracture measurement device measures multiple development parameters of core samples, solving the technical problem of being unable to accurately measure the development degree of core fractures, achieving the technical effect of reducing measurement costs and increasing measurement accuracy, as follows:

[0037] See also Figure 1 、 Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of a core fracture measurement device provided in an embodiment of the present application. Figure 2 This is a side view of a core fracture measurement device provided in an embodiment of the present application. Figure 3 This is a top view of a core fracture measurement device provided in an embodiment of the present application. Figures 1 to 3 As shown, the core fracture measurement equipment 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 on the top surface of the bottom panel, and the first baffle and the second baffle are arranged in parallel; an angle measuring plate 4 and an auxiliary guide plate 5, the angle measuring plate and the auxiliary guide plate are parallelly arranged between the first baffle and the second baffle, the specifications of the angle measuring plate and the auxiliary guide plate are the same and the vertical surfaces perpendicular to the bottom panel but not close to the baffle are both set as triangles, wherein the first baffle, the second baffle, the angle measuring plate and the auxiliary guide plate are surrounded by 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 close to the side of the angle measuring plate located in the groove and the side wall of the core to be measured is close to the side of the first baffle located in the groove, and the center of the circular top surface is maintained at the position of the triangle The hypotenuse of the shape, the circular top surface refers to a circular surface closest to the ground plane in the rock core to be measured; a length measuring ruler 8, the length measuring ruler is arranged on the hypotenuse of the triangle corresponding to the angle measuring plate and the auxiliary guide 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 rock core to be measured and the circular top surface; wherein, a radius measuring ruler 6 is provided at the first connection position where the angle measuring plate is connected to the bottom plate, the radius measuring ruler is used to measure the radius length of the circular surface of the rock core to be measured, and an angle measuring ruler 7 is provided at the second connection position where the angle measuring plate is connected to the second baffle, the angle measuring ruler is used to measure the angle between the radius formed by connecting the center of the circle corresponding to the intersection points of each scale and the hypotenuse, the intersection point refers to the point where the connecting line formed by each scale and the connection point between the right angle side of the angle measuring plate and the first baffle intersects on the edge of the circular surface of the rock core to be measured.

[0038] Specifically, the angle measuring plate is made of 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, wherein 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 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 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.

[0039] That is to say, if Figure 1 As shown, with origin o, the first horizontal direction refers to the direction of the x-axis, the second horizontal direction refers to the direction of the y-axis, and the vertical direction refers to the direction of the z-axis, with the vertical direction being perpendicular to the horizontal plane of xoy. Furthermore, the bottom panel has a length of 32 cm in the first horizontal direction, a width of 102 cm in the second horizontal direction, and a thickness of 1 cm in the vertical direction. The first and second baffles have identical specifications, with a length of 1 cm in the first horizontal direction, a width of 102 cm in the second horizontal direction, and a length of 30 cm in the vertical direction. Furthermore, the bottom edges of the first and second baffles, parallel to the horizontal plane, are fixed to the top surface of the bottom panel. The first and second baffles are arranged parallel to each other, with a vertical distance of 30 cm between them, i.e., the length of the bottom panel in the first horizontal direction minus the length of the first and second baffles in the first horizontal direction. That is, the side of the first baffle farthest from the second baffle is in the same plane as the side of the bottom panel farthest from the second baffle, and the side of the second baffle farthest from the first baffle is in the same plane as the side of the bottom panel farthest from the first baffle.

[0040] Furthermore, the angle measurement plate and the auxiliary guide plate have identical specifications. The vertical surface formed by the first horizontal and vertical directions in the angle measurement plate and the auxiliary guide plate is triangular, perpendicular to the base plate and not in close contact with the first and second baffles. The surface of the base plate formed by the first horizontal and vertical directions and closer to the angle measurement plate is coplanar with the vertical surface of the angle measurement plate farther from the auxiliary guide plate. The bottom surface formed by the first and second horizontal directions in the angle measurement plate and the auxiliary guide plate is fixed to the base plate, and the side surface formed by the second horizontal and vertical directions in the angle measurement plate and the auxiliary guide plate is in close contact with the second baffle. Furthermore, the length of the angle measurement plate and the auxiliary guide plate in the first horizontal direction is 30 cm, the width of the angle measurement plate and the auxiliary guide plate in the second horizontal direction is 1 cm, and the thickness of the angle measurement plate and the auxiliary guide plate in the vertical direction is 30 cm. In other words, the vertical surface of the angle measurement plate and the auxiliary guide plate in the xoz plane forms an isosceles right triangle with a right-angled side of 30 cm.

[0041] That is to say, the first baffle is fixed on the bottom panel along one edge of the bottom panel in the second horizontal direction, and the second baffle is fixed on the bottom panel along another edge of the bottom panel in the second horizontal direction. The vertical surface of the angle measuring plate is an isosceles right triangle, so as 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 of its right-angled sides is fixed on the bottom panel along one edge fixed to the bottom panel in the first horizontal direction, and the other right-angled side is fixed to the side of the second baffle close to the first baffle.

[0042] Specifically, the radius measuring ruler is provided on a surface 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 provided on a surface of the second baffle close to the circular top surface and formed by the first horizontal direction and the vertical direction. Figure 1 As shown, the radius measuring ruler 6 is provided on a surface of the bottom plate formed by the first horizontal direction and the vertical direction, and this surface is coplanar with the vertical surface of the angle measuring plate, and is engraved on a side of the bottom plate connected to the angle measuring plate 4; the angle measuring ruler 7 is provided on a surface of the second baffle plate formed by the first horizontal direction and the vertical direction, and this surface is coplanar with the vertical surface of the angle measuring plate, and is engraved on a side of the second baffle plate connected to the angle measuring plate.

[0043] Specifically, 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, and each scale on the angle measuring ruler reflects the corresponding angle through the vertical distance from the bottom panel.

[0044] 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 the angle measuring plate and the auxiliary guide plate. Figure 3 The scale range of the length measuring ruler provided in the embodiment of the present application is from 0 to 100 cm.

[0045] The lower limit scale of the radius measuring ruler is located on the side close to the first baffle, the upper limit scale of the radius measuring ruler is located on the other side close to the second baffle, and 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. Figure 2 The scale range of the radius measuring ruler provided in 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.

[0046] See also Figure 4 , Figure 4 This is a side view of the core fracture measurement device provided in the embodiment of the present application. Figure 4 As shown, a cylindrical core 9 to be tested is placed in a groove formed by a first baffle, a second baffle, an angle measurement plate, an auxiliary guide plate, and a bottom plate. The circular surface of the core closest to the ground serves as the top surface, which abuts the side of the angle measurement plate within the groove. The sidewall of the core abuts the side of the first baffle within the groove. Furthermore, a length ruler is used to measure the vertical distance from any point on the sidewall of the core to the top surface. A radius ruler is used to measure the core radius of the top surface of the core, and an angle ruler is used to detect the angle α. The scale on the angle ruler is set based on the relationship between the angle α and the vertical distance x from the bottom plate. For each scale mark on the angle ruler, the scale mark is connected to the zero mark on the radius ruler. The intersection of the connecting line with the edge of the top surface and then the center of the circle is connected to obtain the radius corresponding to that scale mark. The angle between the radius and the hypotenuse is recorded as the angle corresponding to that scale mark. Furthermore, the lower limit scale of the angle measuring ruler is located on the side away from the bottom plate, and the upper limit scale of the angle measuring ruler is located on the other side close to the bottom plate. The scale range of the angle measuring ruler refers to the range from the zero mark to the preset angle, and the preset angle refers to the angle between the hypotenuse and a point on it and a perpendicular line to the bottom plate. For example, refer to Figure 2 The scale range of the angle measuring ruler provided in the embodiment of the present application is from 0 to 135°.

[0047] Furthermore, the angle measurement plate is made of a transparent material and includes multiple auxiliary angle measurement lines. Each auxiliary angle measurement line connects from the connection point between the angle measurement plate and the second baffle to the corresponding scale mark on the angle measurement scale. Specifically, each scale mark on the angle measurement plate is connected to the zero mark on the radius measurement scale to form an auxiliary angle measurement line corresponding to each scale mark. Furthermore, the multiple auxiliary angle measurement lines on the radius measurement scale include thick lines and thin lines. The thick lines represent auxiliary lines corresponding to angles of full ten degrees, while the thin lines represent auxiliary lines corresponding to angles with units digits of five degrees. The scale marks on the radius measurement scale are spaced one degree apart.

[0048] For example, refer to Figure 4 , the relationship between the angle α corresponding to each scale and the vertical distance x of the bottom panel is described by the following formula:

[0049] (1)

[0050] 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 embodiment of the present application. According to the embodiment of the present application, R is 15 cm. Refers to the angle between the connecting line connecting the scale and the zero scale of the radius measuring ruler and the bottom plate. It refers to the isosceles triangle's scalene divided by For angles other than the zero mark on the radius ruler, L refers to the length of the line connecting the scale of the angle ruler and the zero mark on the radius ruler.

[0051] See also Figure 5 , Figure 5 This is a schematic diagram of a length measuring ruler provided in an embodiment of the present application. Figure 5 As shown, the length measuring ruler 8 is a rectangular parallelepiped, and sliding guide grooves are provided at the connection points where the length measuring ruler is connected to the angle measuring plate 4 and the auxiliary guide rail plate 5 respectively. The rectangular parallelepiped is placed vertically 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 on the inclined plane along the hypotenuse of the triangle.

[0052] Exemplarily, 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 achieve sliding of the length measuring ruler along the hypotenuse of the triangle on the inclined plane through convex-concave cooperation.

[0053] That is, the sliding length measuring ruler drives the length measuring ruler to slide along the inclined plane formed by the hypotenuse of the triangle corresponding to the angle measuring plate and the auxiliary guide plate respectively, and during the sliding process, the distance between the connecting guide groove connecting the length measuring ruler and the angle measuring plate and the second baffle is maintained to be equal to the distance between the connecting guide groove connecting the length measuring ruler and the auxiliary guide plate and the second baffle, and the cylindrical rock core to be measured in the groove is fixed by the sliding length measuring ruler.

[0054] Based on the same application concept, the embodiments of the present application also provide a method for measuring the underground actual development parameters of core fractures corresponding to the core fracture measurement equipment provided in the above embodiments. Since the principle of solving the problem by the underground actual development parameter measurement method in the embodiments of the present application is similar to that of the core fracture measurement equipment in the above embodiments of the present application, the implementation of the underground actual development parameter measurement method can refer to the implementation of the equipment, and the repeated parts will not be repeated.

[0055] Exemplarily, the method for measuring actual underground development parameters of core fractures provided in the embodiments of the present application includes the following steps:

[0056] S101: Acquire a formation dip value of a coring layer section where a core to be measured is located, and a true dip value of a formation marker layer on the core to be measured located in an underground original position is equal to the formation dip value.

[0057] Specifically, the formation dip value of the coring interval is obtained by collecting and analyzing geological information around the well. This can be divided into two situations. The first is for areas with high oil and gas exploration potential. By collecting 3D seismic data, well-connected profile data, and drilling data from adjacent wells around the well area, a 3D contour map of the top or bottom buried depth of the coring interval is drawn to obtain the formation dip information of the coring interval at the well location. The second is for areas with low exploration potential. By collecting 2D seismic profiles, gravity, magnetic and electrical profiles, or outcrop geological survey profiles from past wells, combined with outcrop formation occurrence data to the right of the well area, a 2D profile map of the top or bottom buried depth of the coring interval is drawn to obtain the formation dip information of the coring interval at the well location.

[0058] That is to say, when the coring layer section where the core to be tested is located is known, the formation dip value of the coring layer section can be directly obtained by looking up the data.

[0059] Furthermore, the core's stratigraphic markers are identified by identifying sedimentary laminae and rock bedding. These markers are natural interfaces formed during stratum deposition and are parallel to the top or bottom of the overall stratum. Furthermore, the true in-situ dip value of the stratigraphic marker identified on the core is equal to the dip value of the coring interval.

[0060] S102: Place the rock core to be measured in the groove, determine the highest point of the stratigraphic marker layer by reading the scales of each point on the stratigraphic marker layer of the rock core to be measured on the length measuring ruler, and mark on the circular top surface the highest projection point of the stratigraphic marker layer projected with respect to the highest point of the stratigraphic marker layer, the first projection diameter of the dip line corresponding to the stratigraphic marker layer passing through the highest projection point of the stratigraphic marker layer, and the lowest projection point of the stratigraphic marker layer.

[0061] Among them, the highest projection point of the formation marker layer refers to the point obtained by projecting the highest point of the formation marker layer along the length measuring ruler to the edge of the circular top surface, the first projection diameter refers to the diameter drawn along the hypotenuse of the angle measuring plate on the circular top surface passing through the highest projection point of the formation marker layer, and the lowest projection point of the formation marker layer refers to the endpoint of the two endpoints of the first projection diameter except the highest projection point of the formation marker layer.

[0062] That is, the device is placed flat on the ground or on an operating table, the core to be measured is placed in the groove, and the circular surface of the core to be measured that is closest to the ground plane is used as the circular top surface. The circular top surface is in close contact with the side of the angle measuring plate in the groove, and the side wall of the core to be measured is in close contact with the side of the first baffle in the groove. The length measuring ruler is tangent to the side wall of the core to be measured by sliding the length measuring ruler.

[0063] See also Figure 6 and Figure 7 As shown, Figure 6 A top view of a device for projecting a stratum marker layer provided in an embodiment of the present application, Figure 7 A side view of a device for projecting a stratum marker layer provided in an embodiment of the present application. Figure 6 As shown in the figure, the scale range of the length measuring ruler is from 0 to 100 cm. The scale of each point on the formation marker layer of the core to be measured is determined by rotating the core to be measured. The point on the formation marker layer with the smallest scale is taken as the highest point Q0 of the formation marker layer. The figure also shows cracks A1 and A2. Figure 6 and Figure 7 As shown, the highest point of the stratigraphic marker is moved along the length measuring ruler toward the circular top surface and the highest projection point Q of the stratigraphic marker is marked on the edge of the circular top surface. At this point, the lowest projection point Q' of the stratigraphic marker naturally intersects with the hypotenuse of the angle measuring plate. A straight line is then drawn along the long oblique edge of the angle measuring plate with a marker pen, passing through the highest projection point Q of the stratigraphic marker, to obtain the first projection diameter located on the circular top surface. This first projection diameter serves as the projection line QQ' of the dip line corresponding to the stratigraphic marker on the core cross section. Obviously, one endpoint of the first projection diameter is the highest projection point Q of the stratigraphic marker, and the other endpoint is the lowest projection point Q' of the stratigraphic marker.

[0064] 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 highest point of the crack on the other side of the crack corresponding to the highest point of the crack are recorded. The highest projection point of the crack projected onto 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 length measuring ruler on the side closest to the circular top surface at the time of intersection and the length value of the lowest point of the crack on the other side of the crack corresponding to the lowest point of the crack are recorded.

[0065] 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 onto the edge of the circular top surface; the second projection diameter refers to the diameter drawn along the hypotenuse of the angle measuring plate on the circular top surface passing through the highest projection point of the crack; and the lowest projection point of the crack refers to the endpoint of the two endpoints on the second projection diameter other than the highest projection point of the crack.

[0066] See also Figure 8 and Figure 9 As shown, Figure 8 A top view of the 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 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 of the ruler 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 the length measuring ruler onto the edge of the circular top surface. i, and use a marker to draw a line along the long side of the angle measuring plate through the highest projection point A of the crack i The straight line, at this time the highest projection point of the crack is A i It naturally intersects with the hypotenuse of the angle measurement plate to obtain the second projection diameter on the circular top surface. The second projection diameter is used as the projection line A of the trend line corresponding to the crack i on the core cross section. i -A i ', and the second projection diameter is the highest projection point A of the crack i The other corresponding endpoint is recorded as the lowest projection point A of the crack i '.

[0067] See also Figure 10 As shown, Figure 10 A top view of the device for projecting cracks provided in an embodiment of the present application Figure 2 .like Figure 10 As shown in the figure, the scale range of the length measuring ruler is from 0 to 100 cm. By rotating the core to be measured, the lowest projection point A of the fracture is i 'Rotate to the position where it intersects with the length measuring ruler, and record 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 lowest point of the crack on the other side of the crack i corresponding to the lowest point of the crack by using the length measuring ruler i，4 Then, record the length l of the highest point of crack i i，1 , the length value l relative to the highest point of the crack i，2 , the length of the lowest point of the crack l i，3 and the length l relative to the lowest point of the crack i，4 .

[0068] S104: For each crack on the core to be measured, the angle between the second projection diameter and the first projection diameter corresponding to the crack is read through the angle measuring plate, and the true crack inclination value of the crack in situ underground is determined according to the angle and the true inclination value, and the intersection between the second projection diameter and the first projection diameter is marked as the center of the circular top surface, and the core radius of the core to be measured is read through the radius measuring ruler.

[0069] For example, Figure 9 As shown, the second projection diameter A corresponding to the crack i is read by the angle measurement auxiliary line on the angle measurement plate. i -A i The angle between the inclination line ' and the first projection diameter QQ' , which can be understood as the second projection diameter Ai - A i ' is rotated clockwise to the angle of the first projection diameter QQ'. And the sum of the angle of the trend line and the true trend value is taken as the true trend value of the crack i in the underground in situ When the sum of the angle between the inclination line and the true inclination value is greater than 360°, it is necessary to subtract the sum of the angle between the inclination line and the true inclination value from 360° to obtain the true fracture inclination value.

[0070] For example, at the angle between the trend lines When ≤135°, the second projection diameter A i - A i 'Rotate until it coincides with the hypotenuse, and the highest projection point of the crack is A i Intersect with the length measuring ruler, directly read the scale value corresponding to the angle measurement auxiliary line where the QQ' line intersects on the angle measuring ruler, and use this scale value as the angle of the inclination line ; at 135°< When the angle is less than 180°, first rotate the first projection diameter QQ' to coincide with the hypotenuse, and the highest projection point Q of the formation marker layer intersects with the length measuring ruler, then rotate the first projection diameter QQ' counterclockwise 135° from the hypotenuse coincidence point, that is, at this time the first projection diameter QQ' is perpendicular to the bottom plate, mark an auxiliary diameter along the hypotenuse on the circular top surface of the core to be measured, and then rotate the core to be measured clockwise to make the second projection diameter A i -A i ' coincides with the hypotenuse, and the highest projection point of the crack is A i Intersect with the length measuring ruler, and then read the scale value of the auxiliary diameter on the angle measuring ruler through the angle measurement auxiliary line. Add 135° to the scale value read at this time to get ;like When it is greater than 180°, the second projection diameter A can be directly i -A i Rotate it until it coincides with the hypotenuse and read the scale value of the first projection diameter QQ' on the angle measuring ruler through the angle measurement auxiliary line, that is, read the scale value of the angle measurement auxiliary line intersected by the lowest projection point Q' of the stratum marker layer in the first projection diameter QQ', and add 180° to the scale value to get .

[0071] Furthermore, the intersection point O between the first projection diameter and the second projection diameter is recorded as the center of the circular top surface, and the core radius r of the core to be measured is obtained by reading the scale corresponding to the center of the circle with a radius measuring ruler.

[0072] S105: For each crack on the rock core to be tested, determine the actual length, actual inclination and actual maximum opening of the crack in situ underground based on the rock core radius, the length value of the highest point of the 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.

[0073] For example, see Figure 11 , Figure 11 Schematic diagram of crack state parameters provided in the embodiment of this application Figure 1 .like Figure 11 As shown in the figure, the wide side of the rectangle 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 ruler. 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, the line is cut downward from the circular top surface of the core to be measured. and , for the other long side of the rectangle, cut downward from the circular top surface of the core to be tested and , and The difference can be understood as the crack width closest to the circular top surface on crack i. and The difference can be understood as the crack width on crack i that is farthest from the circular top surface.

[0074] The true length of the crack in situ underground is calculated using the following formula:

[0075] (2)

[0076] In formula (2), It refers to the actual length of the crack i in the underground, and r refers to the core radius of the core to be tested. Refers to the highest point A of crack i i，0 The length value of Refers to the length relative to the highest point of the crack. Refers to the length of the lowest point of the crack. Refers to the length relative to the lowest point of the crack.

[0077] The true inclination angle of the crack in the underground is calculated using the following formula:

[0078] (3)

[0079] In formula (3), It refers to the true inclination angle of the fracture i in the underground, and r refers to the core radius of the core to be tested. Refers to the length of the highest point of crack i, Refers to the length relative to the highest point of the crack. Refers to the length of the lowest point of the crack. Refers to the length relative to the lowest point of the crack.

[0080] For example, see Figure 12 , Figure 12 Schematic diagram of crack state parameters provided in the embodiment of this application Figure 2 .like Figure 12 As shown, the calculation method of the true maximum opening when the width of the crack closest to the circular top surface on crack i is greater than or equal to the width of the crack farthest from the circular top surface on crack i is different from the calculation method of the true maximum opening when the width of the crack closest to the circular top surface on crack i is less than the width of the crack farthest from the circular top surface on crack i.

[0081] The true maximum opening of the crack in situ underground is calculated using the following formula:

[0082] (4)

[0083] In formula (4), It refers to the true maximum opening of the crack i in situ underground. The true maximum opening is taken as one right angle of a right triangle and the diagonal of the true maximum opening in the right triangle is recorded as , r refers to the core radius of the core to be measured, Refers to the length of the highest point of crack i, Refers to the length relative to the highest point of the crack. Refers to the length of the lowest point of the crack. Refers to the length relative to the lowest point of the crack.

[0084] S106: 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.

[0085] Specifically, the volume ratio of the crack space in situ underground is calculated using the following formula:

[0086]

[0087] In formula (5), Refers to the volume ratio of the crack space of crack i in situ underground, Refers to the volume of the core to be tested where the fracture i is located, It refers to the volume of the fracture space of fracture i in situ underground, H refers to the length of the core to be tested in the second horizontal direction, that is, the vertical distance between the two circular surfaces of the core to be tested, and r refers to the core radius of the core to be tested. Refers to the length of the highest point of crack i, Refers to the length relative to the highest point of the crack. Refers to the length of the lowest point of the crack. Refers to the length relative to the lowest point of the crack.

[0088] Furthermore, for each fracture in the core being tested, the above method is used to determine the actual fracture inclination, length, dip, maximum aperture, and fracture volume fraction of each fracture in situ. These parameters are then used as fracture development parameters. These parameters are then measured and calculated for cores at other depths in the same formation as the core being tested, completing the fracture measurement and calculation for all cores in the same formation. Furthermore, the above fracture development parameters can be calculated for cores (with the same core dimensions as the core being tested) from different formations in the same drilling sequence as the core being tested, completing the fracture measurement and calculation for all cores in the same drilling sequence. The above calculations can also be performed for cores (with different core dimensions) from different drilling sequences from the core being tested, completing the fracture measurement and calculation for all cores in the entire drilling sequence. In addition, the core radius, formation dip value, true dip value, and the length value of the highest point of each fracture, the length value relative to the highest point of the fracture, the length value of the lowest point of the fracture, and the length value relative to the lowest point of the fracture measured from the cores obtained at different openings, different layers, and different depths of the entire drilling well, as well as the calculated trend line angle, true length, true dip, true maximum opening, fracture space volume, and fracture space volume ratio of each fracture are used as the true evaluation parameters of each fracture, so that the true evaluation parameters of all single-well core fractures involved are used as the true evaluation parameter database of single-well core fractures in situ underground.

[0089] Among them, the method also includes: dividing each crack in the rock core to be tested into multiple intervals according to the true crack inclination value and the true inclination of each crack; calculating the cumulative value of the crack space volume proportion of all cracks in each interval, so as to reflect the degree of crack development in different intervals through the cumulative value.

[0090] Furthermore, we can distinguish the times, layers, and depths according to the research needs to count the degree of fracture development of different occurrences, and make a spatial distribution map of the fracture development degree to intuitively evaluate the spatial development law of fractures. In other words, we can divide the intervals according to the accuracy of the research. Figure 13 , Figure 13 The spatial distribution diagram of the degree of crack development provided in the embodiment of this application is as follows: Figure 13 As shown, the circumference represents fracture inclination, dividing 0° to 360° into 36 fracture inclination intervals. The radius represents fracture dip, dividing 0° to 90° into 9 fracture dip intervals, resulting in 324 intervals. Furthermore, the intervals to which each fracture belongs are mapped based on the true fracture inclination and true dip of each fracture within a specific fracture depth interval. The number of fractures within each interval is counted, and the cumulative value of the fracture volume fraction of all fractures within each interval is calculated. The cumulative value is represented by the different shades of the same color. Furthermore, the cumulative value of the fracture volume fraction reflects the true reservoir space of the fractures; a larger cumulative value indicates greater true reservoir space and, therefore, more potential resources. Furthermore, a comprehensive characterization of the fracture development degree in different intervals is performed, ultimately forming a spatial distribution map of fracture development within the studied depth interval. This is used to provide an intuitive, comprehensive, and quantitative assessment of the true in situ development of core fractures, thereby enabling a comprehensive and detailed multi-dimensional evaluation of the effectiveness of fractured reservoirs.

[0091] 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, truly effective, highly accurate, and having low reliance on preliminary work. It is currently the most widely used. It also overcomes the shortcomings of existing direct core fracture measurement methods, such as inconvenient operation, low measurement accuracy, and inability to restore the true occurrence and development parameters of fractures in situ underground. The device of the present invention can accurately measure the relevant parameters of fracture development, and calculate and restore the true in-situ tendency, dip, length, maximum opening and other parameters of the fractures in situ underground through the measured parameters, providing a real data basis for fracture evaluation. And through the non-equidistant angle measurement module and the slidable length measurement module, it can meet the measurement of cores of any size and length within the industry standard range, and can realize the measurement and evaluation of cores taken from different well types, different openings, and different well numbers. The device is also relatively simple in structure, easy to manufacture and carry, and boasts excellent economical and practical field application. Compared to complex geophysical fracture evaluation methods such as imaging logging, it is not limited by the extent of oil and gas exploration, data richness, well type, and size, offering advantages such as lower implementation costs, a wider range of applications, higher measurement accuracy, and faster evaluation speeds. Furthermore, the technical solution of this application, based on the actual in-situ parameters of the fractures obtained, forms an effective fracture evaluation method based on the reservoir space contribution rate. This overcomes the shortcomings of existing single-factor fracture development evaluation methods and enables a comprehensive, multi-dimensional quantitative evaluation of fracture development that simultaneously characterizes three parameters: dip, inclination, and the cumulative value of the fracture space volume fraction.

[0092] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0093] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0094] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0095] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the 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 enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0096] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A core fracture measurement device, characterized in that: The core fracture measurement equipment comprises: bottom panel; a first baffle and a second baffle, wherein 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 measuring plate and an auxiliary guide plate, the angle measuring plate and the auxiliary guide plate are arranged in parallel between the first baffle and the second baffle, the specifications of the angle measuring plate and the auxiliary guide plate are the same, and the vertical surfaces perpendicular to the bottom plate and not in close contact with the baffle are both configured as triangles, wherein the first baffle, the second baffle, the angle measuring plate and the auxiliary guide plate are arranged in a rectangle on the bottom plate and form a groove with the bottom plate, the groove is used to place a cylindrical rock core to be measured, the circular top surface of the rock core to be measured is in close contact with a side of the angle measuring plate located in the groove, and the side wall of the rock core to be measured is in close contact with a 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, and the circular top surface refers to a circular surface of the rock core to be measured that is closest to the ground plane; a length measuring ruler, which is disposed on the hypotenuse of the triangle corresponding to the angle measuring plate and the auxiliary guide plate, and is slidably connected to the hypotenuse and slides along the direction of the hypotenuse, and 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; A radius measuring ruler is provided at the first connection position where the angle measuring plate is connected to the bottom plate, and 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 provided at the second connection position where the angle measuring plate is connected to the second baffle, and the angle measuring ruler is used to measure the angle between the radius formed by connecting the center of the circle at the intersection points corresponding to each scale and the hypotenuse, and the intersection point refers to the point on the edge of the circular surface of the core to be measured where the connecting line formed by each scale and the connection point between the right angle side of the angle measuring plate and the first baffle intersects.

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, and each scale on the angle measuring ruler reflects the corresponding included angle through the vertical distance from the bottom panel. The angle measurement plate includes a plurality of angle measurement auxiliary lines, each of which is connected from a connection point between the angle measurement plate and the second baffle to a corresponding scale of the angle measurement auxiliary line on the angle measurement 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 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 the angle measuring plate and the auxiliary guide 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 a side away from the bottom plate, and the upper limit scale of the angle measuring ruler is located on the other side close to the bottom plate. The scale range of the angle measuring ruler refers to the range from the zero mark to the preset angle, and the preset angle refers to the angle between the hypotenuse and a point on it drawn perpendicular to the bottom plate.

4. The core fracture measurement device according to claim 1, characterized in that: The angle measurement plate is made of 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. 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 measurement plate and the auxiliary guide rail plate in the vertical direction. A 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 a 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 a surface 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 a surface 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 rectangular parallelepiped, and a sliding guide groove is provided at the connection between the length measuring ruler and the angle measuring plate and the auxiliary guide plate. The rectangular parallelepiped is placed vertically on the inclined plane formed by the corresponding triangle hypotenuses of the angle measuring plate and the auxiliary guide plate. Sliding guide rails are provided on the oblique sides of the triangles corresponding to the angle measuring plate and the auxiliary guide rail plate respectively, and the sliding guide rails cooperate with the sliding guide grooves to enable the length measuring ruler to slide on the oblique plane along the oblique sides of the triangles.

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 achieve sliding of the length measuring ruler along the hypotenuse of the triangle on the inclined plane through convex-concave cooperation.

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, and the method includes: Obtaining a formation inclination value of a coring layer section where the core to be measured is located, and a true inclination value of a formation marker layer on the core to be measured located in the underground is equal to the formation inclination value; The rock core to be measured is placed in the groove, and the highest point of the stratigraphic marker layer is determined by reading the scales of each point on the stratigraphic marker layer of the rock core to be measured on the length measuring ruler. The highest projection point of the stratigraphic marker layer projected with respect to the highest point of the stratigraphic marker layer, the first projection diameter of the trend line corresponding to the stratigraphic marker layer passing through the highest projection point of the stratigraphic marker layer, and the lowest projection point of the stratigraphic marker layer are marked on the circular top surface; For each crack on the core to be tested, 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 highest point of the crack on the other side of the crack corresponding to the highest point of the crack are recorded. The highest projection point of the crack projected onto 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 tested 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 length measuring ruler on the side closest to the circular top surface at the time of intersection and the length value of the lowest point of the crack on the other side of the crack corresponding to the lowest point of the crack are recorded. For each crack on the core to be measured, the angle between the second projected diameter and the first projected diameter corresponding to the crack is read using the angle measuring plate, and the true crack inclination value of the crack in situ underground is determined according to the angle and the true inclination value. The intersection of the second projected diameter and the first projected diameter is marked as the center of the circular top surface, and the core radius of the core to be measured is read using the radius measuring ruler. For each fracture on the core to be tested, determining the true length, true inclination, and true maximum opening of the fracture in situ underground based on the core radius, the length of the fracture at its highest point, the length relative to the fracture's highest point, the length of the fracture at its lowest point, and the length relative to the fracture's lowest point; For each crack on the core to be tested, determine the crack space volume proportion of the crack in the core to be tested according to the core radius, the core length of the core to be tested, the length value of the highest point of the 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; The highest projection point of the stratigraphic marker layer refers to the point obtained by projecting the highest point of the stratigraphic marker layer along the length measuring ruler onto 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 layer; and the lowest projection point of the stratigraphic marker layer refers to the endpoint of the two endpoints of the first projection diameter other than the highest projection point of the stratigraphic marker layer; 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 onto the edge of the circular top surface; the second projection diameter refers to the diameter drawn along the hypotenuse of the angle measuring plate on the circular top surface passing through the highest projection point of the crack; the lowest projection point of the crack refers to the endpoint of the two endpoints on the second projection diameter other than the highest projection point of the crack.

9. The method according to claim 8, characterized in that The method further comprises: Dividing each fracture in the rock core to be tested into a plurality of intervals according to the true fracture inclination value and the true inclination angle of each fracture; The cumulative value of the fracture space volume ratio of all fractures in each interval is calculated to reflect the degree of fracture development in different intervals through the cumulative value.

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