Fractured reservoir physical model, manufacturing method thereof and experimental device

Abstract

The application discloses a fractured reservoir physical model and a manufacturing method and an experimental device thereof. The fractured reservoir physical model comprises a plurality of first rock samples arranged in sequence and at intervals, and the first rock sample is provided with a wellbore arranged in penetration. The wellbore on the first rock sample is one-to-one corresponding and forms a wellbore in the arrangement direction of the first rock sample. The interval between adjacent first rock samples forms a plurality of regular fractures with different widths on the whole model. The wellbore on the first rock sample is also provided with irregular fractures. The fracture width and / or the inclination angle relative to the wellbore axis of the irregular fractures on different first rock samples are different. Compared with the prior art, the type and width of the fractures on the fractured reservoir physical model provided by the application are closer to the real fractured reservoir, and the formation conditions of the fractured reservoir can be simulated more truly, so that the accuracy of the experimental results of the fractured reservoir physical simulation can be further improved to a certain extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fractured reservoir research, and particularly relates to a fractured reservoir physical model, a manufacturing method thereof and an experimental device. BACKGROUND

[0002] With the increasing exploration degree of offshore sea areas, the scale of conventional exploration targets available for selection becomes smaller, and the exploration effectiveness is reduced, and the exploration objects gradually expand to new fields such as deep layers and unconventional fields. Exploration practices at home and abroad have confirmed that buried hills are a special type of trap for deep oil and gas enrichment, and have huge exploration potential. Fractures are an important type of reservoir space in bedrock buried hills, and a natural fracture system not only controls the development degree and oil and gas reserves scale of effective reservoirs, but also is an important migration channel in the process of oil and gas production. Fractured reservoirs in buried hills have the characteristics of low porosity, strong heterogeneity and complex fracture distribution, and accurate and effective prediction and description of underground fractures are difficult points in the exploration and development of fractured oil and gas reservoirs. Electrical imaging logging has the characteristics of high resolution and continuous measurement, and can directly reflect fracture information. This technology has been relatively widely applied in the interpretation and evaluation of clastic rock, carbonate rock, mixed rock, volcanic rock and metamorphic rock formations, and is particularly useful for depicting fracture-vug bodies which are closely related to oil and gas accumulation and migration.

[0003] For the research on fractured reservoirs, physical simulation experiments are an important bridge connecting numerical simulation and logging evaluation. They can not only study the electrical imaging logging response of fractured formations, but also verify the results of numerical simulation, and have a guiding role in in-depth analysis of the electrical imaging logging response of fractured formations and optimization of the fracture opening degree evaluation method of electrical imaging logging of fractured formations, and their importance cannot be ignored. Among them, the fractured reservoir physical model is the key to physical simulation experiments. Most of the existing fractured reservoir physical models have single fracture types, and basically have smooth and regular fractures. In addition, the fracture widths of these models are basically in the millimeter level. However, the fractures of fractured reservoirs mostly have a certain dip angle and curvature, and the fracture width is mostly in the micron level. Therefore, most of the existing fractured reservoir physical models cannot truly simulate the real formation conditions of fractured reservoirs, which will affect the accuracy of the results of physical simulation experiments to some extent. SUMMARY

[0004] The present application aims at the deficiencies in the prior art, and provides a fractured reservoir physical model, a manufacturing method thereof and an experimental device, which can solve the technical problem that the fractured reservoir physical model in the prior art cannot truly simulate the real formation conditions of fractured reservoirs and affects the accuracy of the results of physical simulation experiments.

[0005] To achieve the above object, the present application adopts the following technical scheme:

[0006] In a first aspect, the present application provides a fractured reservoir physical model, comprising a plurality of first rock samples arranged in sequence and at intervals, wherein the first rock samples have a borehole arranged therethrough, the boreholes in the first rock samples correspond to each other and form a wellbore in the arrangement direction of the first rock samples, the spacing between adjacent first rock samples forms a plurality of regular fractures with different widths in the model as a whole, and the first rock samples have irregular fractures near the boreholes, and the irregular fractures on different first rock samples have different fracture widths and / or different angles relative to the borehole axis.

[0007] Preferably, the spacing between adjacent first rock samples at least includes 50 μm, 100 μm, 500 μm, 1000 μm and 2000 μm.

[0008] Preferably, according to the angle of the irregular fractures relative to the borehole axis, the irregular fractures at least include the following five types: vertical fractures, low-angle fractures, high-angle fractures I, high-angle fractures II and diagonal fractures.

[0009] Preferably, the fracture width of each of the irregular fractures at least includes the following three types: 10-100 μm, 100-500 μm and 500 μm or more.

[0010] Preferably, the second rock samples are further included, and the second rock samples are arranged around the first rock samples in the middle part of the model.

[0011] In a second aspect, the present application provides a method for manufacturing a fractured reservoir physical model, which is used to manufacture the fractured reservoir physical model of the first aspect, and comprises the following steps:

[0012] Collecting rocks with mineral composition and content close to the simulation ground as materials;

[0013] Cutting the collected rocks into rock samples according to the required size and shape;

[0014] Selecting part of the rock samples as first rock samples and drilling boreholes;

[0015] Artificially creating fractures in the first rock samples with completed borehole drilling;

[0016] Measuring the fracture width of the first rock samples by an instrument to ensure that the fractures meet the requirements;

[0017] Aligning and assembling the first rock samples with completed borehole drilling and artificial fracture creation.

[0018] Preferably, the method further comprises the following step: selecting part of the rock samples as second rock samples and arranging the second rock samples around the first rock samples in the middle part of the model.

[0019] In a third aspect, the present application further provides an experimental device for the fractured reservoir physical model, which is used for the experiment of the fractured reservoir physical model as described in the first aspect, and is characterized in that it comprises:

[0020] a test tank, which has a base for placing the model inside;

[0021] a traction device, which is arranged at least at one end of the test tank, and is suitable for pulling the test device through the well on the model.

[0022] Preferably, a guide well is further arranged between the test tank and the traction device.

[0023] Preferably, the traction device comprises a winch, a fixed frame and a traction rope, the fixed frame has a roller arranged in a rolling manner, and the traction rope is wound on the winch and the roller.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The fractured reservoir physical model provided by the present application is composed of a plurality of rock samples, which have a plurality of types of irregular fractures, the spacing between adjacent rock samples forms regular fractures, and the width range of the fractures on the model is more extensive, including millimeter-level fractures and micron-level fractures. Compared with the prior art, the fracture type and the fracture width are closer to the fracture type and the fracture width in the real fractured reservoir. Therefore, the fractured reservoir physical model provided by the present application can more realistically simulate the formation conditions of the fractured reservoir, and can improve the accuracy of the experimental results of the fractured reservoir physical simulation to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present application, the drawings required in the specific embodiments will be briefly introduced below. It should be noted that in all the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0027] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the fractured reservoir physical model described in the first embodiment of the present application;

[0028] Figure 2 FIG. 2 is a side view of the fractured reservoir physical model described in the first embodiment of the present application;

[0029] Figure 3 FIG. 3 is another side view of the fractured reservoir physical model described in the first embodiment of the present application;

[0030] Figure 4 FIG. 4 is a schematic diagram of the arrangement of the first rock sample of the fractured reservoir physical model described in the first embodiment of the present application;

[0031] Figure 5 Fig. 1 is a schematic diagram of a vertical fracture of the physical model of the fractured reservoir in the first embodiment of the present application;

[0032] Figure 6 Fig. 2 is a schematic diagram of a low-angle fracture of the physical model of the fractured reservoir in the first embodiment of the present application;

[0033] Figure 7 Fig. 3 is a schematic diagram of a high-angle fracture one of the physical model of the fractured reservoir in the first embodiment of the present application;

[0034] Figure 8 Fig. 4 is a schematic diagram of a high-angle fracture two of the physical model of the fractured reservoir in the first embodiment of the present application;

[0035] Figure 9 Fig. 5 is a schematic diagram of a diagonal fracture of the physical model of the fractured reservoir in the first embodiment of the present application;

[0036] Figure 10 Fig. 6 is a schematic diagram of the overall structure of the experimental device of the physical model of the fractured reservoir in the third embodiment of the present application;

[0037] Figure 11 Fig. 7 is a schematic diagram of the overall structure of the well guide of the experimental device of the physical model of the fractured reservoir in the third embodiment of the present application;

[0038] Figure 12 Fig. 8 is a schematic diagram of the overall structure of the base of the experimental device of the physical model of the fractured reservoir in the third embodiment of the present application.

[0039] In the drawings:

[0040] 1, model; 11, first rock sample; 111, borehole; 112, vertical fracture; 113, low-angle fracture; 114, high-angle fracture one; 115, high-angle fracture two; 116, diagonal fracture; 12, second rock sample; 2, test tank; 21, base; 211, first base block; 212, second base block; 3, traction device; 31, winch; 32, fixed frame; 321, roller; 33, traction rope; 4, well guide; 41, traction channel. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some embodiments but not all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the systems or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the use of the terms "first", "second" and the like to define parts is only for the convenience of distinguishing the above-mentioned parts, and the above-mentioned terms have no special meaning unless otherwise stated, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] The physical model of fractured reservoir is the key to the physical simulation experiment of the fractured reservoir. However, the fracture types of most of the existing physical models of fractured reservoirs are single, basically smooth and regular fractures. In addition, the fracture widths of these models are basically larger than millimeters. Therefore, these physical models of fractured reservoirs are difficult to truly simulate the real formation conditions of the fractured reservoir, thereby affecting the accuracy of the physical simulation experiment results of the fractured reservoir to a certain extent. Therefore, in order to make the physical model of fractured reservoir reflect the real formation conditions of the fractured reservoir as much as possible, the present application provides a physical model of fractured reservoir and a manufacturing method and experimental device thereof, which has a fracture type and a fracture width closer to the real fractured reservoir, can more truly simulate the formation conditions of the fractured reservoir, and can improve the accuracy of the physical simulation experiment results of the fractured reservoir to a certain extent.

[0045] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that those skilled in the art can implement the present application in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be accurately conveyed to those skilled in the art.

[0046] Example 1

[0047] As Figures 1-4As shown, the embodiment of the present application provides a fractured reservoir physical model, which comprises a plurality of first rock samples 11 arranged in sequence and at intervals, the first rock sample 11 has a wellbore 111 arranged therethrough, the wellbore 111 on the first rock sample 11 corresponds to the first rock sample 11 one by one and forms a well channel in the arrangement direction of the first rock sample 11, the spacing between adjacent first rock samples 11 forms a plurality of regular fractures with different widths on the model 1 as a whole, and the first rock sample 11 also has irregular fractures near the wellbore 111, and the fracture width and / or the inclination angle relative to the axis of the wellbore 111 of the irregular fractures on different first rock samples 11 are different.

[0048] It should be noted that the number, shape, size and material of the first rock sample 11 can be set according to actual needs, and the present embodiment does not make any limitation on this.

[0049] Preferably, as shown, Figure 4 As shown, the embodiment of the present application provides 15 first rock samples 11 made of granite with mineral composition and content close to the simulation ground, and the first rock sample 11 is a 1m×1m×1m cube. The first rock sample 11 of the present embodiment is made of granite with mineral composition and content close to the simulation ground, which can better simulate the real formation conditions of the exploration ground, and the first rock sample 11 arranged as a cube is conducive to assembling the model 1.

[0050] The fractured reservoir physical model provided by the embodiment of the present application is composed of a plurality of rock samples, the rock sample has a plurality of types of irregular fractures, the spacing between adjacent rock samples forms regular fractures, and the width range of the fractures on the model 1 is more extensive, and it includes millimeter-level fractures and micron-level fractures. Compared with the prior art, the fracture type and fracture width are closer to the fracture type and fracture width in the real fractured reservoir. Therefore, the fractured reservoir physical model provided by the embodiment of the present application can more realistically simulate the formation conditions of the fractured reservoir, and can improve the accuracy of the experimental results of the fractured reservoir physical simulation to a certain extent.

[0051] Further, the spacing between adjacent first rock samples 11 includes at least the following five kinds: 50μm, 100μm, 500μm, 1000μm and 2000μm. The fractured reservoir physical model provided by the present embodiment has micron-level regular fractures and millimeter-level regular fractures on it through the above configuration, which can make the fracture width of the regular fractures on it closer to the fracture width of the regular fractures in the real fractured reservoir, thereby more realistically simulating the formation conditions of the fractured reservoir.

[0052] Specifically, the spacing between rock samples 11 and 2, 6 and 7, and 11 and 12 is 50 μm; the spacing between rock samples 2 and 3, 7 and 8, and 12 and 13 is 100 μm; the spacing between rock samples 3 and 4, and 8 and 13 is... The distances between sample 11 and the 9th and 14th rock samples are 500 μm; the distances between the 4th and 5th rock samples, the 9th and 10th rock samples, and the 14th and 15th rock samples are 1000 μm; and the distances between the 5th and 6th rock samples, and the 10th and 11th rock samples are 2000 μm.

[0053] It should be noted that the configuration of the spacing between adjacent first rock samples 11 in this embodiment is not limited to the above configuration. In some other embodiments, the spacing and / or arrangement of adjacent first rock samples 11 can be adjusted, and the present invention does not impose any restrictions on this.

[0054] Furthermore, such as Figures 5-9 As shown, based on the dip angle of the irregular fracture relative to the axis of wellbore 111, the irregular fracture includes at least the following five types: vertical fracture 112, low-angle fracture 113, high-angle fracture one 114, high-angle fracture two 115, and oblique fracture 116. Among them, the dip angle of vertical fracture 112 relative to the axis of wellbore 111 is close to 90°; the dip angle of low-angle fracture 113 relative to wellbore 111 is less than 75°; the dip angle of high-angle fracture one 114 relative to wellbore 111 is between 75° and 90°; the dip angle range of high-angle fracture two 115 relative to wellbore 111 is the same as that of high-angle fracture one 114 relative to wellbore 111, but the inclination direction is opposite; the oblique fracture 116 includes two intersecting fractures with opposite inclination directions.

[0055] In this embodiment, by setting at least the above five types of irregular fractures on the first rock sample 11, the types of irregular fractures on it are closer to the types of irregular fractures in real fractured reservoirs, thereby enabling it to more realistically simulate the formation conditions of fractured reservoirs.

[0056] Specifically, the irregular cracks on the first rock sample 11 of the first block, the sixth block and the eleventh block are vertical cracks 112; the irregular cracks on the first rock sample 11 of the second block, the seventh block and the twelfth block are low-angle cracks 113; the irregular cracks on the first rock sample 11 of the third block, the eighth block and the thirteenth block are high-angle cracks one 114; the irregular cracks on the first rock sample 11 of the fourth block, the ninth block and the fourteenth block are high-angle cracks two 115; and the irregular cracks on the first rock sample 11 of the fifth block, the tenth block and the fifteenth block are diagonal cracks 116.

[0057] Further, the crack width of each irregular crack at least includes the following three types: 10-100 μm, 100-500 μm and 500 μm or more. For each irregular crack, at least three irregular cracks with different crack widths are provided in the embodiment, which makes the crack width of the irregular cracks on the first rock sample 11 closer to the crack width of the irregular cracks in a real fractured reservoir, so that the formation conditions of the fractured reservoir can be simulated more realistically.

[0058] Specifically, the crack width of the irregular cracks on the first rock sample 11 of the first block, the sixth block and the eleventh block is respectively 10-100 μm, 100-500 μm and 500 μm or more; the crack width of the irregular cracks on the first rock sample 11 of the second block, the seventh block and the twelfth block is respectively 10-100 μm, 100-500 μm and 500 μm or more; the crack width of the irregular cracks on the first rock sample 11 of the third block, the eighth block and the thirteenth block is respectively 10-100 μm, 100-500 μm and 500 μm or more; the crack width of the irregular cracks on the first rock sample 11 of the fourth block, the ninth block and the fourteenth block is respectively 10-100 μm, 100-500 μm and 500 μm or more; and the crack width of the irregular cracks on the first rock sample 11 of the fifth block, the tenth block and the fifteenth block is respectively 10-100 μm, 100-500 μm and 500 μm or more.

[0059] Of course, in other embodiments, the order of the first rock sample 11 can also be adjusted, so that the irregular cracks of different types and crack widths on the model 1 are arranged in an order different from the above, and the present application does not make any limitation in this regard.

[0060] Further, the second rock sample 12 is also included, and the second rock sample 12 is stacked around the first rock sample 11 in the middle part of the model 1. Specifically, the middle part of the model 1 refers to the remaining part excluding the first rock sample 11 at the two ends of the model 1. By stacking the second rock sample 12 around the first rock sample 11 in the middle part of the model 1, the embodiment can meet the array sonic logging measurement in addition to the electrical imaging logging.

[0061] It can be understood that the number and stacking position of the second rock samples 12 can be flexibly set according to actual needs, and the material and shape of the second rock samples 12 can be the same as those of the first rock samples 11, and the present embodiment does not make any limitation in this regard.

[0062] Preferably, as shown in the drawings, the present embodiment has 25 second rock samples 12, and the 25 second rock samples 12 are stacked around the periphery of the 5 first rock samples 11 in the middle of the model 1. Figures 1-3

[0063] Embodiment Two

[0064] The present embodiment also provides a method for manufacturing a fractured reservoir physical model, which is used for manufacturing the fractured reservoir physical model as described in Embodiment One, and comprises the following steps:

[0065] S1: Collecting rocks with mineral components and contents close to a simulated ground as materials;

[0066] S2: Cutting the collected rocks into rock samples according to required sizes and shapes;

[0067] S3: Selecting part of the rock samples as the first rock samples 11 and drilling the wellbores 111;

[0068] S4: Artificially creating fractures in the first rock samples 11 on which the wellbores 111 are drilled;

[0069] Specifically, the method for artificially creating fractures is as follows: first, drill holes with corresponding diameters and depths on the surface of the rock sample, insert the wedge block set (one middle wedge block and two reverse wedge blocks) into the drilled holes, then move the middle wedge block forward before the two reverse wedge blocks by applying pressure on the middle wedge block, and push them outward with a certain pushing force, the split first rock sample 11 will generate fractures within a few seconds, and the width of the fractures can be controlled by the size of the pressure applied on the middle wedge block.

[0070] S5: Measuring the fracture width of the first rock sample 11 by an instrument to ensure that the fractures meet the requirements;

[0071] Specifically, the probe of a fracture measuring instrument or the like can be inserted into the fractures to measure the fracture width and record the fracture width at different positions respectively, so as to determine whether the fracture width on the first rock sample 11 meets the requirements.

[0072] S6: Aligning and assembling the first rock samples 11 on which the wellbores 111 are drilled and the fractures are artificially created;

[0073] For the model 1 provided with the second rock samples 12, the method further comprises the following steps: selecting part of the rock samples as the second rock samples 12, and stacking the second rock samples 12 around the periphery of the part of the first rock samples 11 in the middle of the model 1.

[0074] ​The fracture reservoir physical model prepared by the method has irregular fractures and regular fractures of various types and fracture widths on the surface.

[0075] Embodiment three

[0076] As shown in Figure 10 The application further provides an experimental device of the fracture reservoir physical model, which is used for experiments on the fracture reservoir physical model as described in Embodiment One, and comprises:

[0077] A test tank 2, which has a base 21 for placing the model 1 inside.

[0078] A traction device 3, which is arranged at least at one end of the test tank 2 and is suitable for pulling a testing device (for example, a logging instrument) through the wellbore on the model 1.

[0079] When the embodiment is used, the model 1 is first assembled on the base 21, then a water solution with a certain mineralization is injected into the test tank 2 after the model 1 is assembled, and finally an array acoustic wave, a micro-resistivity scanning imaging and an array lateral logging instrument are pulled through the wellbore by the traction device 3. When the logging instrument passes through the wellbore, the logging information of the fractures around the wellbore is collected. The physical simulation experiment on the fracture reservoir physical model as described in Embodiment One by the embodiment can not only study the electrical imaging logging response of the fractured formation, but also verify the numerical simulation results, which can guide the in-depth analysis of the electrical imaging logging response law of the fractured formation and the optimization of the fracture opening degree evaluation method of the electrical imaging logging of the fractured formation.

[0080] Further, as shown in Figure 11 The test tank 2 and the traction device 3 are further provided with a lead well 4, and the lead well 4 is provided with a traction channel 41. The lead well 4 can facilitate the preparation, installation and testing work of the logging instrument, and ensure that the logging instrument can smoothly enter and exit the fracture reservoir physical model.

[0081] Preferably, the lead well 4 is formed by cement pouring, and a semicircular PVC pipe is buried on the lead well 4 as the traction channel 41.

[0082] Further, the base 21 is stacked by a plurality of base blocks. The base 21 of the embodiment is stacked by a plurality of base blocks, which can reduce the hoisting difficulty of the base 21 and also facilitate transportation.

[0083] It should be noted that the actual number of bottom blocks can be set according to actual factors such as the size of the base 21, and the present embodiment does not limit this.

[0084] Preferably, as shown in the drawings, Figure 12 The base 21 of the present embodiment is stacked by 45 first bottom blocks 211 of 1m x 1m x 1m and 45 second bottom blocks 212 of 1m x 1m x 0.5m, wherein the 45 first bottom blocks 211 are stacked above the 45 second bottom blocks 212. The materials of the first bottom blocks 211 and the second bottom blocks 212 can be rocks such as limestone or sandstone.

[0085] Further, as shown in the drawings, Figure 10 The traction device 3 comprises a winch 31, a fixed frame 32 and a traction rope 33. The fixed frame 32 has a roller 321 arranged to roll, and the traction rope 33 is wound around the winch 31 and the roller 321. The traction rope 33 is used to mount the logging instrument and to pull the logging instrument through the shaft.

[0086] It should be noted that the traction device 3 of the present embodiment is not limited to the above-described traction device, and other types of traction devices can also be used in some other specific embodiments.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit it. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A fractured reservoir physical model characterized in that, The model (1) comprises a plurality of first rock samples (11) arranged in sequence and at intervals, the first rock samples (11) having a borehole (111) arranged therethrough, the boreholes (111) on the first rock samples (11) corresponding one by one and forming a shaft in the arrangement direction of the first rock samples (11), the spacing between adjacent first rock samples (11) forming a plurality of regular cracks of different widths on the model (1) as a whole, and the first rock samples (11) further having irregular cracks near the boreholes (111), the widths and / or the angles relative to the axis of the boreholes (111) of the irregular cracks on different first rock samples (11) being different; the method for artificially creating cracks is as follows: first, drilling a hole of a corresponding diameter and depth on the surface of a rock sample, inserting an intermediate wedge and two reverse wedges into the drilled hole, then applying pressure to the intermediate wedge to make it move forward before the two reverse wedges, and pushing them outward with a certain pushing force, the first rock sample to be split will generate cracks within a few seconds, and the width of the cracks can be controlled by the size of the pressure applied to the intermediate wedge; The spacing between adjacent first rock samples (11) at least includes the following five kinds: 50 μm, 100 μm, 500 μm, 1000 μm and 2000 μm; According to the angle of the irregular cracks relative to the axis of the boreholes (111), the irregular cracks at least include the following five kinds: vertical cracks (112), low-angle cracks (113), high-angle cracks I (114), high-angle cracks II (115) and oblique cracks (116); The width of each of the irregular cracks at least includes the following three kinds: 10-100 μm, 100-500 μm and 500 μm or more.

2. The fractured reservoir physical model of claim 1, wherein, The model (1) further comprises second rock samples (12) arranged around the first rock samples (11) in the middle part of the model (1).

3. A method for manufacturing a fractured reservoir physical model, for manufacturing a fractured reservoir physical model according to claim 1 or 2, characterized in that, The method comprises the following steps: Collecting rocks with mineral composition and content close to the simulation site as materials; Cutting the collected rocks into rock samples according to the required size and shape; Selecting part of the rock samples as first rock samples (11) and drilling boreholes (111); Artificially creating cracks on the first rock samples (11) after the drilling of the boreholes (111); Measuring the crack width of the first rock samples (11) by an instrument to ensure that the cracks meet the requirements; Aligning and assembling the first rock samples (11) after the drilling of the boreholes (111) and the artificial creation of cracks.

4. The method of claim 3, wherein the step of creating a physical model of a fractured reservoir is performed by: The method further comprises the following steps: Selecting part of the rock samples as second rock samples (12) and arranging the second rock samples (12) around the first rock samples (11) in the middle part of the model (1).

5. An experimental apparatus of a fractured reservoir physical model for performing an experiment on the fractured reservoir physical model according to claim 1 or 2, characterized by, The method comprises: A test tank (2) having a base (21) for placing the model (1) inside; A traction device (3) arranged at least at one end of the test tank (2), the traction device (3) being suitable for pulling a test device through the shaft on the model (1).

6. The experimental apparatus for a fractured reservoir physical model of claim 5, wherein, An introduction shaft (4) is further arranged between the test tank (2) and the traction device (3).

7. The experimental apparatus for a fractured reservoir physical model of claim 5, wherein, The traction device (3) comprises a winch (31), a fixed frame (32) with a roller (321) arranged to roll, and a traction rope (33) wound around the winch (31) and the roller (321).

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