A physical model of thin interbedded sandstone and mudstone and its fabrication method

Abstract

This invention discloses a physical model of thin interbedded sandstone and mudstone and its fabrication method, comprising: a standard horizontal layer, thin interbedded layers, a homogeneous layer, and a fault layer, arranged from top to bottom. The simulation material for the standard horizontal layer is a mixture of epoxy resin and silicone rubber in a ratio of 1:0.33 to 1:0.37. The thin interbedded layers consist of sandstone and mudstone layers, with the mudstone and sandstone layers tightly bonded together, the mudstone layer tightly bonded to the standard horizontal layer, and the mudstone layer tightly bonded to the fault layer. The thin interbedded layers 2 are constructed using epoxy resin and... The simulation material is a mixture of epoxy resin and silicone rubber, wherein the mixing ratio of epoxy resin and silicone rubber in the mudstone layer is 1:0.18-1:0.22, and the mixing ratio of epoxy resin and silicone rubber in the sandstone layer is 1:0.08-1:0.12; the simulation material for the homogeneous layer is epoxy resin; and the simulation material for the fault layer is epoxy resin and talc powder mixed in a ratio of 1:0.8-1:1.2. The beneficial effect of this invention is that the physical model of this invention can better study the seismic reflection characteristics of thin interbedded sandstone and mudstone layers.

Description

Technical Field

[0001] This invention relates to the field of oil and gas geophysical exploration technology, specifically to a physical model of thin interbedded sandstone and mudstone and its fabrication method. Background Technology

[0002] In thin interbedded sandstone and mudstone formations, the lithology and thickness vary significantly laterally. These thin interbedded sandstone and mudstone formations have a much lower vertical resolution than conventional seismic exploration. When the thickness of a single sandstone layer is less than the seismically resolvable vertical thickness, and the difference is substantial, conducting single-layer prediction studies is extremely difficult. Therefore, creating a physical model of thin interbedded sandstone and mudstone formations and combining it with forward modeling techniques to theoretically study the seismic reflection characteristics of these formations will have significant theoretical and practical implications for qualitatively or quantitatively determining the thickness of each single layer within the thin interbedded formations and predicting the spatial distribution of these thin interbedded layers.

[0003] In existing technologies, multiple materials are mixed during the fabrication of physical models for thin interbedded reservoirs. For example, Chinese patent document CN107640936B, "Physical Model Material for Sandstone Reservoirs and its Preparation Method," describes a sandstone reservoir physical model material comprising the following components after pressing and curing: silicate cement, quartz sand of different mesh sizes, water, water-reducing agent, defoamer, epoxy resin, and curing agent. It controls the porosity and P-wave and S-wave velocities of the sandstone model material by varying the quartz sand content and pressing pressure. The porosity is controlled between 8% and 25%, the P-wave velocity between 2800 m / s and 4800 m / s, and the S-wave velocity between 1500 m / s and 2500 m / s.

[0004] The aforementioned scheme can basically meet the requirements when constructing individual reservoirs within thin interbedded layers. However, on the one hand, due to the large number and complexity of components, seismic wave velocities are difficult to control. On the other hand, when constructing physical models of thin interbedded layers, the complex composition may lead to factors between different layers that are unfavorable to seismic simulation representation. For example, air gaps may form between layers, resulting in low-velocity zones during seismic simulation and affecting seismic wave propagation. Increasing the compressive force to eliminate air gaps may damage the model. Therefore, the existing technology for constructing multi-layered thin interbedded physical models is not ideal for studying the seismic reflection characteristics of thin interbedded sandstone and mudstone layers. Summary of the Invention

[0005] The technical problem to be solved by this invention is that the existing physical models of thin interbedded sandstone and mudstone are not effective in studying the seismic reflection characteristics of thin interbedded sandstone and mudstone. The purpose of this invention is to provide a physical model of thin interbedded sandstone and mudstone and its manufacturing method, so that the physical model can better study the seismic reflection characteristics of thin interbedded sandstone and mudstone.

[0006] This invention is achieved through the following technical solution:

[0007] A method for constructing a physical model of thin interbedded sandstone and mudstone includes the following steps:

[0008] Based on the actual geological work area and actual geological conditions, physical model parameter data are established. The physical model is designed from top to bottom as a simulation model of standard horizontal layer, thin interbedded layer, homogeneous layer and fault layer. The thin interbedded layer includes sandstone layer and mudstone layer.

[0009] Step 2) Mix the simulation materials according to the preset ratio and prepare the materials for each layer of the physical model. The simulation material for the thin interlayer is a mixture of epoxy resin and silicone rubber.

[0010] Step 3) Each layer of the physical model is poured into the mold at the designed speed (the propagation speed of seismic waves);

[0011] Step 4) Wait for each layer of the physical model to solidify from a liquid state to a solid state, then demold the solidified and solidified physical model.

[0012] Step 5) Polish the demolded physical model to obtain the final physical model.

[0013] Optionally, the mudstone layer in the thin interbedded layers is designed to have a velocity of 2200 m / s, and is made by mixing epoxy resin and silicone rubber in a ratio of 1:0.18-1:0.22; the sandstone layer in the thin interbedded layers is designed to have a velocity of 2450 m / s, and is made by mixing epoxy resin and silicone rubber in a ratio of 1:0.08-1:0.12.

[0014] Optionally, the standard horizontal layer is designed with a speed of 2000 m / s and is made by mixing epoxy resin and silicone rubber in a ratio of 1:0.33-1:0.37; the uniform layer is designed with a speed of 2600 m / s and is made of epoxy resin; the tortuous layer is designed with a speed of 2900 m / s and is made by mixing epoxy resin and talc in a ratio of 1:0.8-1:1.2.

[0015] Optionally, during the casting process of the uniform layer, a lens body is cast into the interior of the uniform layer. The lens body is designed to be cast at a speed of 2400 m / s, and the lens body is made of epoxy resin and silicone rubber mixed in a ratio of 1:0.10-1:0.14.

[0016] Optionally, the thin interlayers have a left thin interlayer, a middle thin interlayer, a middle second thin interlayer, and a right thin interlayer from left to right, and the left thin interlayer, the middle first thin interlayer, the middle second thin interlayer, and the right thin interlayer are cast separately.

[0017] A physical model of thin interbedded sandstone and mudstone includes: a standard horizontal layer, thin interbedded layers, a homogeneous layer and a fault layer designed from top to bottom;

[0018] The thin interbedded layer has a sandstone layer and a mudstone layer, the mudstone layer and the sandstone layer are closely attached to each other, the mudstone layer is closely attached to the standard horizontal layer, and the mudstone layer is closely attached to the fault layer.

[0019] Optionally, the thin interlayers are made of a simulated material composed of epoxy resin and silicone rubber. The mixing ratio of epoxy resin and silicone rubber in the mudstone layer (21) is 1:0.18-1:0.22; and the mixing ratio of epoxy resin and silicone rubber in the sandstone layer (22) is 1:0.08-1:0.12.

[0020] Optionally, the simulated material of the standard horizontal layer is epoxy resin and silicone rubber in a mixing ratio of 1:0.33-1:0.37; the simulated material of the uniform layer is epoxy resin; and the simulated material of the fracture layer is epoxy resin and talc in a mixing ratio of 1:0.8-1:1.2.

[0021] Optionally, the uniform layer has a lens body inside, and the simulated material of the lens body is an epoxy resin and silicone rubber mixed in a ratio of 1:0.10-1:0.14.

[0022] Optionally, the thin interlayers have a left thin interlayer, a middle thin interlayer, a middle second thin interlayer, and a right thin interlayer from left to right. A baffle is provided between the left thin interlayer and the middle first thin interlayer, between the middle first thin interlayer and the middle second thin interlayer, and between the middle second thin interlayer and the right thin interlayer. The baffle is made of tin foil. The thickness of the left thin interlayer, the middle first thin interlayer, the middle second thin interlayer, and the right thin interlayer is the same.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] 1. The physical model of this invention is designed from top to bottom as a simulation model of a standard horizontal layer, a thin interbedded layer, a homogeneous layer, and a fault layer. The standard horizontal layer and the thin interbedded layer both use a mixture of epoxy resin and silicone rubber as the simulation material. The thin interbedded layer can be tightly bonded to the other layers, which also use epoxy resin or a mixture of epoxy resin. There are no air gaps between the layers of the physical model. The sandstone and mudstone layers within the thin interbedded layer both use a combination of epoxy resin and silicone rubber, ensuring a tight bond between them. No air gaps or pores are generated within the thin interbedded layer, thus not affecting the earthquake simulation effect. The difference between the final measured equivalent velocity used in each layer of the physical model and the designed velocity of each layer is within the allowable error range. The propagation of seismic wave velocity is easily controlled. Because there are no air gaps between the layers of the physical model and within the thin interbedded layer, the physical model will not exhibit low-velocity zones of seismic waves during earthquake simulation; the seismic waves propagate at normal speeds. The physical model of this invention is more effective in studying the seismic reflection characteristics of thin interbedded sandstone and mudstone layers.

[0025] 2. The present invention places a lens body within a homogeneous layer, which improves the tight bonding within the homogeneous layer. The fault layer includes a normal fault and a reverse fault. The normal and reverse faults can meet the needs of studying the seismic reflection conditions of complex fault block regions in basin facies.

[0026] 3. The thin interlayer of the present invention consists of a left thin interlayer, a middle thin interlayer, a middle second thin interlayer, and a right thin interlayer from left to right. The thin interlayer is relatively complex, consisting of multiple sandstone layers and multiple mudstone layers interlaced and stacked. If the thin interlayer model is formed according to the existing technology, the thin interlayer needs to be pressed and the pressing force is difficult to control, which may lead to model cracking or air ingress, ultimately affecting the effect of the physical model. In the present invention, the sandstone layers and mudstone layers are formed by interlacing multiple sandstone layers and multiple mudstone layers using epoxy resin and silicone rubber materials. The sandstone layers and mudstone layers form a tightly bonded thin interlayer, which will not produce air gaps that affect the simulation effect. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0028] Figure 1 This is a cross-sectional view of the physical model of the present invention;

[0029] Figure 2 This is a cross-sectional view of the thin interbedded mudstone and sandstone layers of the present invention;

[0030] Figure 3 This is a forward modeling diagram of the physical model of the present invention.

[0031] The attached diagram shows the markings and corresponding component names:

[0032] 1-Standard horizontal layer, 2-Thin interbedded layer, 21-Mudstone layer, 22-Sandstone layer, 3-Uniform layer, 4-Fault layer, 5-Lens, 6-Baffle, 01-Left thin interbedded layer, 02-Middle first thin interbedded layer, 03-Middle second thin interbedded layer, 04-Right thin interbedded layer. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0034] Example 1

[0035] like Figure 1 As shown in the figure, this embodiment presents a physical model of thin interbedded sandstone and mudstone, including: a standard horizontal layer 1, a thin interbedded layer 2, a uniform layer 3, and a fault layer 4 designed from top to bottom.

[0036] The simulation material for the standard horizontal layer 1 is epoxy resin and silicone rubber mixed in a ratio of 1:0.33-1:0.37; the thin interbedded layer 2 consists of a sandstone layer 21 and a mudstone layer 22, which are tightly bonded together. The mudstone layer 21 is tightly bonded to the standard horizontal layer 1, and the mudstone layer 22 is tightly bonded to the fault layer 4. The thin interbedded layer 2 uses a simulation material composed of epoxy resin and silicone rubber, wherein the mixing ratio of epoxy resin and silicone rubber in the mudstone layer 21 is 1:0.18-1:0.22, and the mixing ratio of epoxy resin and silicone rubber in the sandstone layer 22 is 1:0.08-1:0.12; the simulation material for the homogeneous layer 3 is epoxy resin; the simulation material for the fault layer 4 is epoxy resin and talc mixed in a ratio of 1:0.8-1:1.2.

[0037] like Figure 1 As shown, the uniform layer 3 has a lens body 5 inside, and the simulated material of the lens body 5 is an epoxy resin and silicone rubber with a mixing ratio of 1:0.10-1:0.14.

[0038] like Figure 2As shown, the thin interlayer 2 has a left thin interlayer 01, a middle thin interlayer 02, a middle second thin interlayer 03 and a right thin interlayer 04 from left to right. A baffle 6 is provided between the left thin interlayer 01 and the middle thin interlayer 02, between the middle thin interlayer 02 and the middle second thin interlayer 03, and between the middle second thin interlayer 03 and the right thin interlayer 04. The baffle 6 is tin foil. The thicknesses of the left thin interbedded layer 01, the middle thin interbedded layer 02, the middle second thin interbedded layer 03, and the right thin interbedded layer 04 are the same. The only difference is that the left thin interbedded layer 01 has only one mudstone layer 21 and one sandstone layer 22, which are arranged sequentially from top to bottom. The middle thin interbedded layer 02 is composed of multiple mudstone layers 21 and sandstone layers 22, which are arranged alternately from the upper mudstone layer 21 to the lower sandstone layer 22. The middle second thin interbedded layer 03 has more mudstone layers 21 and sandstone layers 22 than the middle first thin interbedded layer 02. The design of the middle second thin interbedded layer 03 is the same as that of the middle first thin interbedded layer 02. The right thin interbedded layer 04 is also designed according to the method of the middle first thin interbedded layer 02, except that the thicknesses of the mudstone layers 21 and sandstone layers 22 are different, but the overall thickness of the thin interbedded layers 2 is the same.

[0039] Example 2

[0040] This embodiment provides a method for creating a physical model of thin interbedded sandstone and mudstone, including the following steps:

[0041] Step 1) Establish physical model parameter data based on the actual geological work area and actual geological conditions. The physical model is designed from top to bottom as a simulation model of standard horizontal layer 1, thin interbedded layer 2, uniform layer 3 and fault layer 4. The thin interbedded layer 2 has sandstone layer and mudstone layer.

[0042] Step 2) Mix the simulation materials according to the preset ratio and prepare the materials for each layer of the physical model. The simulation material for the thin interlayer 2 is a mixture of epoxy resin and silicone rubber.

[0043] Step 3) Each layer of the physical model is poured into the mold at the designed speed;

[0044] Step 4) Wait for each layer of the physical model to solidify from a liquid state to a solid state, then demold the solidified and solidified physical model.

[0045] Step 5) Polish the demolded physical model to obtain the final physical model.

[0046] The mudstone layer in thin interbedded layer 2 is designed to have a velocity of 2200 m / s, and is made by mixing epoxy resin and silicone rubber in a ratio of 1:0.18-1:0.22; the sandstone layer in thin interbedded layer 2 is designed to have a velocity of 2450 m / s, and is made by mixing epoxy resin and silicone rubber in a ratio of 1:0.08-1:0.12.

[0047] The standard horizontal layer 1 is designed for a speed of 2000 m / s and is made by mixing epoxy resin and silicone rubber in a ratio of 1:0.33-1:0.37; the uniform layer 3 is designed for a speed of 2600 m / s and is made of epoxy resin; the fracture layer 4 is designed for a speed of 2900 m / s and is made by mixing epoxy resin and talc in a ratio of 1:0.8-1:1.2.

[0048] During the pouring process of the uniform layer 3, the lens body 5 is poured into the interior of the uniform layer 3. The lens body 5 is designed to be poured at a speed of 2400m / s. The lens body 5 is made of epoxy resin and silicone rubber mixed in a ratio of 1:0.10-1:0.14.

[0049] Among them, the thin interlayer 2 has a left thin interlayer 01, a middle thin interlayer 02, a middle second thin interlayer 03 and a right thin interlayer 04 from left to right. The left thin interlayer 01, the middle thin interlayer 02, the middle second thin interlayer 03 and the right thin interlayer 04 are cast respectively.

[0050] Example 3

[0051] Based on Examples 1-2, an actual geological work area was examined, revealing a spatial extent of 4980m in length, 1500m in width, and 1735m in depth. A physical model was designed at a scale of 1:5000. For example... Figure 1 The cross-section of the designed physical model is shown. The physical model has dimensions of 996 mm in length, 600 mm in width, and 347 mm in height.

[0052] The physical model consists of four layers. The first layer is a standard horizontal layer 1 with a height of 125mm, a width of 600mm, and a length of 996mm. The second layer is a thin interlayer 2 with a length of 996mm, a width of 600mm, and a height of 16mm. The third layer is a uniform layer 3, in which seven lens bodies 5 are placed. The lens bodies 5 are all the same size, with a width of 34mm and a thickness of 5mm. The fourth layer is a fault layer 4, which includes one normal fault and one reverse fault. The normal fault has a fault height of 14.5mm, and the reverse fault has a fault height of 6.2mm. The model corresponding to each layer is made according to the design shape of each layer. The simulation material is mixed and poured into the mold according to the design speed.

[0053] The simulation materials mainly consist of epoxy resin and silicone rubber. The theoretical design pouring speed of the first standard horizontal layer 1 is 2000 m / s. Epoxy resin and silicone rubber are selected and mixed in a ratio of 1:0.33-1:0.37 (preferably 1:0.35) and poured into the mold. The final measured equivalent speed of this mixture is 2050 m / s, which is within the allowable error range compared to the actual design speed.

[0054] The second layer is a thin interlayer 2, such as Figure 2 As shown, the model includes a mudstone layer 21 and a sandstone layer 22. Because the mudstone and sandstone layers are unevenly distributed horizontally, three baffles 6 (made of aluminum foil, which does not affect the speed of the mold after casting) are required, and casting operations are performed between the baffles. The designed speed for mudstone layer 21 is 2200 m / s. Epoxy resin and silicone rubber are mixed in a ratio of 1:0.18-1:0.22 (preferably 1:0.2) and poured into the mold. The final measured equivalent speed is 2260 m / s, which is within the allowable error range compared to the actual designed speed. The designed speed for sandstone layer 22 is 2450 m / s. Epoxy resin and silicone rubber are mixed in a ratio of 1:0.08-1:0.12 (preferably 1:0.1) and poured into the mold. The final measured equivalent speed of this mixture is 2432 m / s, which is also within the allowable error range compared to the actual designed speed.

[0055] The third layer is a uniform layer 3, containing a lens body 5 (used to simulate sandstone). The uniform layer 3 is designed to have a speed of 2600 m / s, and the final equivalent speed measured using epoxy resin is 2608 m / s, which is within the allowable error range compared to the actual design speed. The lens body 5 is designed to have a speed of 2400 m / s. Epoxy resin and silicone rubber are mixed in a ratio of 1:0.10-1:0.14 (preferably 1:0.12) and poured into a mold. The final equivalent speed measured for this mixed material is 2391 m / s, which is also within the allowable error range compared to the actual design speed.

[0056] The fourth layer, fault layer 4, was designed to be poured at a speed of 2900 m / s. Epoxy resin and talc were selected and mixed in a ratio of 1:0.8-1:1.2 (preferably 1:1) before being poured into the mold. The final measured equivalent velocity of this mixture was 2902 m / s, which is within the allowable error range compared to the actual design velocity. This layer incorporates both normal and reverse faults, meeting the needs of studying seismic reflections in complex fault-block regions of the basin.

[0057] In summary, the speed of theoretical design is related to the mixing ratio of simulated materials. Therefore, it is necessary to conduct experiments in the early stage to complete the calibration and obtain the correspondence between the mixing ratio and the designed speed.

[0058] Using the physical model created in this embodiment, forward modeling is performed to obtain the following results: Figure 3 The seismic data volume shown is from Figure 3 As can be seen from the forward modeling record based on the designed physical model, the wave field information is very rich in the thin interbedded sandstone and mudstone and fault zones, which also confirms the scientific nature of the physical model designed in this invention.

[0059] In this invention, such as Figure 2 As shown, the thin interlayered structure is quite complex, consisting of multiple sandstone and mudstone layers interwoven and stacked. If the thin interlayered structure is formed using existing techniques, it requires compression, and the compression force is difficult to control, leading to model cracking or air ingress, ultimately affecting the model's performance. In this invention, both the sandstone and mudstone layers utilize a combination of epoxy resin and silicone rubber, ensuring a tight bond between the multiple sandstone and mudstone layers and preventing air gaps from affecting the simulation. Furthermore, other layers also use epoxy resin or epoxy resin mixtures, allowing for a relatively tight bond between the thin interlayered structure and other layers. Epoxy resin and silicone rubber are readily available, resulting in low model cost.

[0060] In the above embodiments, the physical model is established based on the actual object to be studied. According to the method of embodiment 2, the present invention finally forms a physical model. If the object to be studied changes, the physical model will also change accordingly. For example, if it changes to 5 layers, the geological layers represented by each layer will also change, so it will not be described in detail.

[0061] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for fabricating a physical model of thin interbedded sandstone and mudstone, characterized in that, Includes the following steps: Step 1) Establish physical model parameter data based on the actual geological work area and actual geological conditions. The physical model is designed from top to bottom as a simulation model of standard horizontal layer (1), thin interbedded layer (2), uniform layer (3) and fault layer (4). The thin interbedded layer (2) has sandstone layer and mudstone layer. The thin interbedded layer (2) has left thin interbedded layer (01), middle thin interbedded layer (02), middle second thin interbedded layer (03) and right thin interbedded layer (04) from left to right. The left thin interbedded layer (01), middle thin interbedded layer (02), middle second thin interbedded layer (03) and right thin interbedded layer (04) are poured respectively. Step 2) Mix the simulation materials according to the preset ratio and prepare each layer of the physical model. The simulation material of the thin interlayer (2) is a mixture of epoxy resin and silicone rubber. Step 3) Each layer of the physical model is poured into the mold at the designed speed; Step 4) Wait for each layer of the physical model to solidify from a liquid state to a solid state, then demold the solidified and solidified physical model. Step 5) Polish the demolded physical model to obtain the final physical model.

2. The method for fabricating a physical model of thin interbedded sandstone and mudstone according to claim 1, characterized in that, The designed velocity of the mudstone layer in the thin interlayer (2) is 2200 m / s, and epoxy resin and silicone rubber are mixed in a ratio of 1:0.18-1:0.

22. The sandstone layer in the thin interlayer (2) is designed to have a velocity of 2450 m / s, and is made by mixing epoxy resin and silicone rubber in a ratio of 1:0.08-1:0.

12.

3. The method for fabricating a physical model of thin interbedded sandstone and mudstone according to claim 1, characterized in that, The standard horizontal layer (1) is designed for a speed of 2000 m / s and is made by mixing epoxy resin and silicone rubber in a ratio of 1:0.33-1:0.37; the uniform layer (3) is designed for a speed of 2600 m / s and is made of epoxy resin; the fracture layer (4) is designed for a speed of 2900 m / s and is made by mixing epoxy resin and talc in a ratio of 1:0.8-1:1.

2.

4. The method for fabricating a physical model of thin interbedded sandstone and mudstone according to claim 3, characterized in that, During the casting process of the uniform layer (3), a lens body (5) is poured into the interior of the uniform layer (3). The lens body (5) is designed to be 2400 m / s. The lens body (5) is made of epoxy resin and silicone rubber mixed in a ratio of 1:0.10-1:0.

14.

5. A physical model of thin interbedded sandstone and mudstone, comprising a method for fabricating a physical model of thin interbedded sandstone and mudstone as described in any one of claims 1-4, characterized in that, include: The layers designed from top to bottom are: a standard horizontal layer (1), a thin interlayer (2), a homogeneous layer (3), and a fault layer (4); The thin interbedded layer (2) has a sandstone layer (22) and a mudstone layer (21), the mudstone layer (21) and the sandstone layer (22) are closely attached to each other, the mudstone layer (21) is closely attached to the standard horizontal layer (1), and the sandstone layer (22) is closely attached to the uniform layer (3). The thin interlayer (2) consists of a left thin interlayer (01), a middle thin interlayer (02), a middle second thin interlayer (03), and a right thin interlayer (04) from left to right. A baffle (6) is provided between the left thin interlayer (01) and the middle thin interlayer (02), between the middle thin interlayer (02) and the middle second thin interlayer (03), and between the middle second thin interlayer (03) and the right thin interlayer (04). The baffle (6) is made of tin foil. The thickness of the left thin interlayer (01), the middle thin interlayer (02), the middle second thin interlayer (03), and the right thin interlayer (04) is the same.

6. The physical model of thin interbedded sandstone and mudstone according to claim 5, characterized in that, The thin interlayer (2) is a simulated material made of epoxy resin and silicone rubber. The mixing ratio of epoxy resin and silicone rubber in the mudstone layer (21) is 1:0.18-1:0.22; the mixing ratio of epoxy resin and silicone rubber in the sandstone layer (22) is 1:0.08-1:0.

12.

7. The physical model of thin interbedded sandstone and mudstone according to claim 5, characterized in that, The simulated material of the standard horizontal layer (1) is epoxy resin and silicone rubber with a mixing ratio of 1:0.33-1:0.37; the simulated material of the uniform layer (3) is epoxy resin; and the simulated material of the fracture layer (4) is epoxy resin and talc with a mixing ratio of 1:0.8-1:1.

2.

8. The physical model of thin interbedded sandstone and mudstone according to claim 7, characterized in that, The uniform layer (3) has a lens body (5) inside, and the simulated material of the lens body (5) is epoxy resin and silicone rubber in a mixing ratio of 1:0.10-1:0.14.

Images