Molding method for near-source phase, middle-source phase and far-source phase of volcanic institution

Abstract

The invention discloses a method for molding a near-source phase, a middle-source phase and a far-source phase of a volcanic institution, and the method comprises the steps: S1, constructing a three-dimensional digital model of the volcanic institution in a to-be-simulated region, and the three-dimensional digital model comprises a near-source phase belt digital model, a middle-source phase belt digital model and a far-source phase belt digital model; s2, selecting a high-speed material, and crushing and screening the high-speed material to obtain high-speed material powder; wherein the speed of the high-speed material is 200-400m / s higher than that of the volcanic mechanism overflow phase, and the density of the high-speed material is greater than that of the volcanic mechanism overflow phase And S3, the obtained high-speed material powder is adopted, a composition containing epoxy resin serves as an overflow phase for casting molding, three-dimensional carving is conducted according to the obtained near-source phase belt digital model, the obtained middle-source phase belt digital model and the obtained far-source phase belt digital model, and a near-source phase belt model, a middle-source phase belt model and a far-source phase belt model are manufactured respectively. The molding method disclosed by the invention is more intuitive and accurate and has higher modifiability.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas geophysics, and particularly to a method for making models of the near-source facies, mid-source facies, and far-source facies of volcanic structures. Background Art

[0002] Through exploration, it has been found that the closer the drilling location is to the volcanic crater, the greater the probability of hydrocarbon accumulation, and the farther away, the smaller the probability. This provides an important clue for volcanic rock exploration, that is, to find the central facies belt of the volcanic structure. However, the differences in hydrocarbon accumulation benefits among the facies belts of the volcanic structure are not yet clear, so it is necessary to carry out research on the hydrocarbon accumulation mechanism of the volcanic structure. Among them, the division of the facies belts of the volcanic structure and the quantitative analysis of the reservoirs in each facies belt are the research basis. Through literature research, it is known that the characteristic lithologies of the volcanic crater - near - volcanic - crater facies belt are breccia / agglomerate lava, cryptoexplosion breccia, and perlite, and the characteristic lithofacies are volcanic conduit facies and extrusive facies. The volcanic rocks in this facies belt are characterized by large thickness, large dip angle, and small extension distance. The characteristic lithologies of the near - source facies belt are crystal clasts, lithic clasts, and pumice clast tuff lava, and the characteristic lithofacies are wedge - shaped and massive effusive facies (with high - angle flow structures) and explosive facies (with pseudo - flow structures). The volcanic rocks in this facies belt have medium thickness, large dip angle, and far extension. The characteristic lithologies of the far - source facies belt are layered volcanic clastic rocks, sedimentary volcanic clastic rocks, and gently layered tuff lava, and the characteristic lithofacies are bedded volcanic sedimentary facies and explosive facies. The volcanic rocks in this facies belt are thin in thickness, small in dip angle, and large in extension range. So far, there has been no relevant research on the forward modeling of the volcanic crater facies, near - mid - far - source facies, nor relevant modeling methods and bases.

[0003] Seismic physical simulation technology is a seismic simulation method that makes physical models of field geological structures and geological bodies in the laboratory according to a certain simulation similarity ratio, and simulates field seismic exploration methods using methods such as ultrasonic waves. It is a very important seismic forward modeling means. The design and production of physical models are one of its key technologies, and the production process of the models directly affects the experimental results. Existing modeling means consider the modeling process of special geological bodies such as volcanic structures, but only divide different periods and lithologies, and there is no production method for the near - mid - far - source facies belt models of volcanic structures.

[0004] Volcanic strata are characterized by a short formation time, rapid construction, and a long erosion time. Their formation and construction processes are different from those of sedimentary strata. Although certain understandings have been formed regarding the identification of volcanic stratum interfaces and the characterization of volcanic strata, there has been relatively little research on the lateral variation units of volcanic structures. In actual volcanic structures, the physical properties of geological bodies vary significantly with the distance from the volcanic vent, and these differences in physical properties are closely related to the enrichment of oil and gas reservoirs. There has been very little research on the characterization of different facies zones (proximal, middle, and distal facies zones) through seismic methods, and it is difficult to clearly distinguish the seismic wavefield characteristics. Through forward physical simulation, the seismic wavefield characteristics of the proximal, middle, and distal facies zones of volcanic structures can be more intuitively reflected, providing strong support for the exploration and development of volcanic rocks. However, there has been relatively little physical simulation research on the proximal, middle, and distal facies zones of volcanic structures. Summary of the Invention

[0005] The object of the present invention is to overcome the problem in the prior art that there is no phased-zone production for volcanic structure models, and to provide a method for producing models of the proximal facies zone, middle facies zone, and distal facies zone of a volcanic structure. This production method can obtain a physical model that conforms to the differences in the proximal facies zone, middle facies zone, and distal facies zone of a volcanic structure, ensuring that the superimposed relationship, shape, and size of the proximal facies zone, middle facies zone, and distal facies zone are accurately reflected. At the same time, this model is more intuitive and has stronger modifiability.

[0006] To achieve the above object, the present invention provides a method for producing models of the proximal facies zone, middle facies zone, and distal facies zone of a volcanic structure, and the production method includes:

[0007] S1. Construct a three-dimensional digital model of the volcanic structure in the area to be simulated, and the three-dimensional digital model includes a digital model of the proximal facies zone, a digital model of the middle facies zone, and a digital model of the distal facies zone;

[0008] S2. Select a high-speed material, crush and screen the high-speed material to obtain high-speed material powder; wherein, the speed of the high-speed material is 200 - 400 m / s higher than that of the overflow phase of the volcanic structure, and the density is greater than that of the overflow phase of the volcanic structure;

[0009] S3. Use high-speed material powders with different particle sizes and contents, and use a composition containing epoxy resin as the overflow phase for casting and molding. Perform three-dimensional carving according to the digital model of the proximal facies zone, the digital model of the middle facies zone, and the digital model of the distal facies zone obtained in step S1 to respectively produce a proximal facies zone model, a middle facies zone model, and a distal facies zone model.

[0010] Through the above technical solution, the beneficial technical effects achieved by the present invention are as follows:

[0011] The present invention provides a method for making a three-dimensional physical model of the near-source facies belt, middle-source facies belt, and far-source facies belt of a three-dimensional volcanic structure. Applying the present invention can better make a three-dimensional physical model of a volcanic structure with lateral variations, and its advantages are mainly as follows:

[0012] (1) The model established digitally is more intuitive and has stronger modifiability. At the same time, three-dimensional carving is carried out using the digital model to ensure that the superimposed relationship, shape, and size of the near-source facies belt, middle-source facies belt, and far-source facies belt are accurately reflected;

[0013] (2) The materials used for the overflow facies of the volcanic structure are the same, and the difference lies in the particle diameter and content of the high-speed materials contained therein, which can better simulate the physical property differences of different facies belts. Description of the Drawings

[0014] Figure 1 is a process flow chart of the production of a three-dimensional physical model of the near-source facies, middle-source facies, and far-source facies of a volcanic structure provided by an embodiment of the present invention;

[0015] Figure 2 is a model diagram of the near-source facies belt, middle-source facies belt, and far-source facies belt obtained in Example 1 of the present invention. Detailed Embodiments

[0016] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0017] In terms of lateral variations, a volcanic structure generally forms a near-source facies belt, a middle-source facies belt, and a far-source facies belt centered on a volcanic crater. Different facies belts have different physical property characteristics. The present invention provides a method for making a physical model of the near, middle, and far-source facies belts with different physical property characteristics for the near-source facies belt, middle-source facies belt, and far-source facies belt. The present invention uses physical simulation technology to study the prerequisite conditions of the near, middle, and far-source facies belts of a volcanic structure, that is, to more realistically make a physical model of the near, middle, and far-source facies belts of a volcanic structure, so as to carry out subsequent data collection and wave field characteristic analysis and other research.

[0018] The present invention provides a method for making a model of the near-source facies, middle-source facies, and far-source facies of a volcanic structure, and the method for making a model includes the following steps:

[0019] S1. Construct a three-dimensional digital model of the volcanic structure in the area to be simulated, and the three-dimensional digital model includes a digital model of the near-source facies belt, a digital model of the middle-source facies belt, and a digital model of the far-source facies belt;

[0020] S2. Select high-speed materials, crush and screen the high-speed materials to obtain high-speed material powders; wherein, the speed of the high-speed materials is 200 - 400 m / s higher than that of the overflow phase of the volcanic mechanism, such as 200 m / s, 220 m / s, 250 m / s, 280 m / s, 300 m / s, 320 m / s, 350 m / s, 380 m / s, 400 m / s, and any value within the range composed of any two values, preferably 250 - 350 m / s, and the density is greater than that of the overflow phase of the volcanic mechanism;

[0021] S3. Use high-speed material powders with different particle sizes and contents, and use the epoxy resin-containing composition as the overflow phase for casting and molding. Perform three-dimensional carving according to the digital models of the proximal facies belt, middle facies belt, and distal facies belt obtained in step S1 to respectively produce the proximal facies belt model, middle facies belt model, and distal facies belt model.

[0022] In the present invention, the overflow phase refers to the hot magma flowing out in a planar or linear manner from the volcanic crater or along the fissure to form various types of lava or breccia lava. Common volcanic rock facies include the eruption (or extrusive) facies, volcanic conduit facies, sub-volcanic rock facies, and volcanic-sedimentary facies. Among them, the eruption (or extrusive) facies is further divided into the overflow phase, explosive phase, and exusive phase.

[0023] In the present invention, the volcanic mechanism is also called a volcanic body or volcanic accumulation. It refers to the general term for each component that constitutes a volcano. It includes the cone above the ground and the magma channel underground. The volcanic mechanism is the final result of the interaction between two opposite forces of construction and transformation. Volcanic rock, also known as extrusive rock, belongs to a type of magmatic rock (igneous rock), and is an extrusive rock formed by the magma ejected from the volcanic crater to the surface and then cooled and solidified. Volcanic rock is formed by the magma ejected to the surface and cooled and crystallized in the atmosphere and hydrosphere. When the magma erupts along the fissure, the shape of the volcanic rock generally coordinates with the surface shape and is in the form of a sheet or layer.

[0024] The present invention can better produce a three-dimensional physical model of the volcanic mechanism with lateral variations. The digitally established model is more intuitive and has stronger modifiability. At the same time, three-dimensional carving is performed using the digital model to ensure that the superimposed relationship, shape, and size of the proximal facies belt, middle facies belt, and distal facies belt are accurately reflected.

[0025] In some embodiments of the present invention, step S1 specifically includes:

[0026] S11. Determine the size of the area to be simulated and the location of the volcanic crater; wherein, the volcanic crater is adjacent to the middle position of the area to be simulated, and the distal facies belt is included within the area to be simulated;

[0027] S12. Determine the geological parameters of the proximal facies belt, middle facies belt, and distal facies belt respectively. The geological parameters include shape, scope, height, and superposition relationship.

[0028] S13. Complete digital modeling of the models determined in step S11 and step S12 in the modeling system, and form a surface file that can be used for three-dimensional carving. Among them, the surface file contains three independent carving files for the proximal facies belt, middle facies belt, and distal facies belt.

[0029] In view of the volcanic mechanism characteristics of the target area, the present invention mainly considers the proximal facies, middle facies, and distal facies laterally, establishes a digital model, and the modeling process mainly relies on the geological model, combines the geological background of the actual work area, and establishes a three-dimensional digital model of the proximal, middle, and distal facies belts of the volcanic mechanism.

[0030] In some embodiments of the present invention, in step S2, the high-speed material is an organic material, preferably a saccharide polymer represented by the chemical formula (C6H 12 O6) n shown, and more preferably a high-molecular organic saccharide polymer represented by the chemical formula (C6H 12 O6) n shown, where n is generally from tens of thousands to hundreds of thousands.

[0031] In the present invention, the saccharide polymer represented by the chemical formula (C6H 12 O6) n shown is preferably a sucrose-based one, CAS No: 57-50-1.

[0032] The present invention fills the volcanic mechanism with this high-speed material in different particle sizes, and can simulate the physical property characteristics of different facies belts.

[0033] In some embodiments of the present invention, the epoxy resin contained in the epoxy resin-containing composition is preferably epoxy resin E-51.

[0034] In some embodiments of the present invention, the epoxy resin-containing composition contains an epoxy curing agent.

[0035] In some embodiments of the present invention, the epoxy curing agent is selected from basic curing agents, preferably selected from amine-based basic curing agents, and more preferably selected from polyamine-based curing agents.

[0036] In some embodiments of the present invention, the mass ratio of the epoxy resin to the epoxy resin curing agent is 1:0.4 - 0.5.

[0037] In some embodiments of the present invention, in step S3, the method for making the proximal facies belt model specifically includes:

[0038] Mix the epoxy resin-containing composition with high-speed material powder. After evacuating the air, perform casting molding, and then perform three-dimensional carving according to the digital model of the near-source phase zone obtained in step S1 to obtain a near-source phase zone model; wherein, the high-speed material powder includes a first high-speed material powder and a second high-speed material powder, the average particle size of the first high-speed material powder is 500 - 700 μm, and the average particle size of the second high-speed material powder is 200 - 400 μm.

[0039] In the present invention, the near-source phase zone is the closest to the crater and can include the crater phase. The near-source phase zone is mostly developed with large-diameter high-speed anomalies such as breccia and agglomerate lava. The near-source phase zone is developed with large-diameter high-speed anomalies and a small number of small-diameter anomalies.

[0040] In some embodiments of the present invention, the mass ratio of the epoxy resin contained in the epoxy resin-containing composition to the high-speed material powder is 1:0.08 - 0.12, such as 1:0.08, 1:0.09, 1:0.1, 1:0.11, 1:0.12, and any value within the range composed of any two values.

[0041] In some embodiments of the present invention, the mass ratio of the first high-speed material powder to the second high-speed material powder is 1:0.2 - 0.3, such as 1:0.2, 1:0.22, 1:0.25, 1:0.28, 1:0.3, and any value within the range composed of any two values.

[0042] In some embodiments of the present invention, in step S3, the method for fabricating the middle-source phase zone model specifically includes:

[0043] Mix the epoxy resin-containing composition with high-speed material powder. After evacuating the air, perform casting molding, and then perform three-dimensional carving according to the digital model of the middle-source phase zone obtained in step S1 to obtain a middle-source phase zone model; wherein, the high-speed material powder includes a first high-speed material powder and a second high-speed material powder, the average particle size of the first high-speed material powder is 500 - 700 μm, and the average particle size of the second high-speed material powder is 200 - 400 μm.

[0044] In the present invention, the middle-source phase zone is at a moderate distance from the crater. The middle-source phase zone is also developed with a small number of large-diameter high-speed anomalies such as breccia and agglomerate lava, and at the same time, a large number of small-diameter high-speed anomalies are developed.

[0045] In some embodiments of the present invention, the mass ratio of the epoxy resin contained in the epoxy resin-containing composition to the high-speed material powder is 1:0.05 - 0.07, such as 1:0.05, 1:0.06, 1:0.07, and any value within the range composed of any two values.

[0046] In some embodiments of the present invention, the mass ratio of the first high-speed material powder to the second high-speed material powder is 0.2 - 0.3:1, such as 0.2:1, 0.22:1, 0.25:1, 0.28:1, 0.3:1, and any value within the range composed of any two of these values.

[0047] In some embodiments of the present invention, in step S3, the method for fabricating the far-source facies belt model specifically includes:

[0048] Mix the epoxy resin-containing composition with the high-speed material powder, after evacuating the air, perform casting molding, and then perform three-dimensional carving according to the far-source facies belt digital model obtained in step S1 to obtain the far-source facies belt model; wherein, the high-speed material powder includes the second high-speed material powder, and the particle size of the second high-speed material powder is 200 - 400 μm.

[0049] In the present invention, the far-source facies belt is far from the crater, and a small number of high-speed anomalies with small diameters are developed.

[0050] In some embodiments of the present invention, the mass ratio of the epoxy resin contained in the epoxy resin-containing composition to the high-speed material powder is 1:0.015 - 0.025, such as 1:0.015, 1:0.018, 1:0.02, 1:0.022, 1:0.025, and any value within the range composed of any two of these values.

[0051] During the fabrication processes of the above-mentioned near-source facies belt model, middle-source facies belt model, and far-source facies belt model, the materials used for the overflow phase of the volcanic apparatus are the same, all being the epoxy resin-containing composition. The difference lies in the particle diameter and content of the high-speed materials contained therein, which can better simulate the physical property differences of different facies belts.

[0052] In some embodiments of the present invention, before step S1, the mold-making method further includes: mixing epoxy resin, an epoxy resin curing agent, and talcum powder. Adding talcum powder is to increase the speed and density of the mixture, and then perform casting molding to obtain the bottom of the model; wherein, the mass ratio of epoxy resin, the epoxy resin curing agent, and talcum powder is 1:0.5 - 0.6:0.3 - 0.4.

[0053] In the present invention, the epoxy resin is preferably epoxy resin E51, and the model number of the epoxy resin curing agent is preferably 2269.

[0054] In some embodiments of the present invention, after step S3, the mold making method further includes: mixing epoxy resin, epoxy resin curing agent, silicone rubber and silicone rubber curing agent, adding silicone rubber to reduce the velocity and density of the mixture, and casting and molding to obtain the overlying formation of the model; wherein, the mass ratio of epoxy resin, epoxy resin curing agent, silicone rubber and silicone rubber curing agent is 1:0.5 - 0.6:0.5 - 0.6:0.02 - 0.03.

[0055] In the present invention, the epoxy resin is preferably epoxy resin E51, the model number of the epoxy resin curing agent is preferably 2269, and the model number of the silicone rubber is preferably 107.

[0056] According to a particularly preferred embodiment of the present invention, as Figure 1 shown, a three-dimensional physical model method for the proximal facies, middle facies and distal facies of a volcanic structure specifically includes the following steps:

[0057] (1) Construct a three-dimensional digital model: Using the geological characteristics of the area to be simulated and the geological model of the proximal, middle and distal source facies zones of the volcanic crater, determine the scope of the area to be simulated, determine the location of the volcanic conduit and the location of the volcanic crater, design the shapes and sizes of the proximal facies zone, middle and distal facies zones, and construct a three-dimensional digital model of the volcanic structure; the three-dimensional digital model includes a digital model of the proximal facies zone, a digital model of the middle facies zone and a digital model of the distal facies zone; the specific steps for digital modeling of different facies zones are as follows:

[0058] For the characteristics of the volcanic structure in the area to be simulated, mainly consider the proximal facies, middle facies and distal facies horizontally, establish a digital model, and the modeling process is mainly based on the geological model, combined with the geological background of the actual work area, to establish a three-dimensional digital model of the proximal, middle and distal source facies zones of the volcanic structure. First, it is necessary to determine the size of the simulated work area and the location of the volcanic crater. The volcanic crater should be as close as possible to the middle position of the selected work area, and the distal facies zone should be included within the work area. Then, determine the geological parameters of the proximal facies zone, middle facies zone and distal facies zone respectively, mainly including shape, scope, height, superposition relationship, etc. Finally, complete the digital modeling of the above determined model in the modeling system and form a surface file that can be used for three-dimensional carving. The surface file contains three independent carving files for the proximal, middle and distal source facies zones.

[0059] (2) Pour the bottom of the model: Select an aluminum alloy mold with an inner diameter size of 100*80*50 cm. In this mold, mix epoxy resin, epoxy resin curing agent and talcum powder, and cast and mold to obtain the bottom of the model; wherein, the mass ratio of epoxy resin, epoxy resin curing agent and talcum powder is 1:0.5 - 0.6:0.3 - 0.4, preferably 1:0.5:0.3;

[0060] (3) Produce the proximal facies zone model:

[0061] The proximal facies belt is the closest to the crater, and the crater facies can also be included in it. The proximal facies belt is mostly developed with large-diameter high-speed anomalies such as breccia and agglomerate lava. Therefore, the present invention has found a high-speed material, which is an organic material with the chemical formula (C6H 12 O6) n . Its speed is about 300 m / s higher than that of the effusive facies of the volcanic mechanism, and its density is slightly greater than that of the effusive facies. The present invention fills this material with different particle sizes in the volcanic mechanism to simulate the physical properties of different facies belts. The proximal facies belt is developed with large-diameter high-speed anomalies and a small number of small-diameter anomalies. First, the high-speed material is crushed, and the first high-speed material powder with an average particle size of 500 - 700 μm and the second high-speed material powder with an average particle size of 200 - 400 μm are selected by mesh screening. The effusive facies is cast with a composition containing epoxy resin. The mass ratio of epoxy resin to the high-speed material is 1:0.08 - 0.12, preferably 1:0.1. Among them, the mass ratio of the first high-speed material to the second high-speed material is 1:0.2 - 0.3, preferably 1:0.25. An epoxy curing agent is added to the epoxy resin to obtain a composition containing epoxy resin, and the high-speed material is added according to the above ratio, stirred thoroughly and evacuated, then cast into a mold, and finally three-dimensional carving is carried out using the digital model obtained in (1) to complete the production of the proximal facies belt model;

[0062] (4) Fabricate the middle-source facies belt model:

[0063] The middle-source facies belt is at a moderate distance from the crater. The middle-source facies belt is also developed with a small number of large-diameter high-speed anomalies such as breccia and agglomerate lava, and at the same time, a large number of small-diameter high-speed anomalies are developed. The high-speed material used in fabricating the middle-source facies belt is the same as that in (3). First, the high-speed material is crushed, and the first high-speed material powder with an average particle size of 500 - 700 μm and the second high-speed material powder with an average particle size of 200 - 400 μm are selected by mesh screening. The effusive facies is cast with a composition containing epoxy resin. The mass ratio of epoxy resin to the high-speed material is 1:0.05 - 0.07, preferably 1:0.06. Among them, the mass ratio of the first high-speed material to the second high-speed material is 0.2 - 0.3:1, preferably 0.25:1. An epoxy curing agent is added to the epoxy resin to obtain a composition containing epoxy resin, and the high-speed granular material is added according to the above ratio, stirred thoroughly and evacuated, then cast into a mold, and finally three-dimensional carving is carried out using the digital model obtained in (1) to complete the production of the middle-source facies belt model;

[0064] (5) Fabricate the distal facies belt model:

[0065] The far-source phase belt is far from the crater, and a small number of small-diameter high-speed anomalies are developed. The high-speed material used in making the far-source phase belt is the same as that in (3). First, the high-speed material is crushed, and the high-speed material with an average particle size of 200-400μm is selected by mesh screening. The overflow phase is cast with epoxy resin, and the mass ratio of epoxy resin to high-speed material is 1:0.015-0.025, preferably 1:0.02. Epoxy curing agent is added to the epoxy resin, and high-speed granular material is added according to the above ratio, fully stirred and vacuumed, and then cast and molded. Finally, the digital model obtained in (1) is used for three-dimensional carving, thereby completing the production of the meso-source phase belt model;

[0066] (6) Casting of overlying strata on the model:

[0067] Epoxy resin, epoxy resin curing agent, silicone rubber and silicone rubber curing agent are mixed and cast to obtain a model overlying stratum; wherein the mass ratio of epoxy resin, epoxy resin curing agent, silicone rubber and silicone rubber curing agent is 1:0.5-0.6:0.5-0.6:0.02-0.03, preferably 1:0.5:0.5:0.025.

[0068] In the present invention, the mold is a customized product, and the mold mainly controls the production of surrounding rock strata. In the process of producing the three-phase belt, the order is the proximal source phase belt, the intermediate source phase belt and the distal source phase belt, and finally the overlying strata.

[0069] The present invention completes the production of the model through the above steps. The materials used in the overflow phase of the volcanic structure are the same, and the difference is the particle diameter and content of the high-speed material contained therein, which can better simulate the physical property differences of different phase belts; the model digitally established by this method is more intuitive and more modifiable. At the same time, the digital model is used for three-dimensional carving to ensure that the superposition relationship, shape and size of the proximal source phase belt, the intermediate source phase belt and the distal source phase belt are accurately reflected.

[0070] The present invention will be described in detail below through examples.

[0071] In the following examples and comparative examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if no manufacturer is specified, are all conventional products that can be obtained through commercial channels.

[0072] Epoxy resin: Nantong Xingchen Synthetic Materials Co., Ltd.; Brand: WSR618 (E-51);

[0073] Epoxy resin curing agent: Rich New Materials (Guangzhou) Co., Ltd.; brand 2269;

[0074] Silicone rubber and silicone rubber curing agent: Shanghai Yanxin Resin Co., Ltd.; brand 107.

[0075] The first high-speed material is sucrose, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., item number: S112228, and the powder was screened with a particle size of 200-400 μm.

[0076] The second high-speed material is sucrose, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., item number: S112228, and the powder was screened with a particle size of 200-400 μm.

[0077] Test method: Material velocity is obtained by ultrasonic testing system.

[0078] Example 1

[0079] use Figure 1 The flowchart shown in the figure is used to make a three-dimensional physical model of the volcanic structure of the Huoshiling Formation in the Chaganhua area of ​​the Songnan Fault Depression. The specific steps are as follows:

[0080] (1) Using the geological characteristics of the region and the geological model of the proximal, middle and distal source phases of the crater, determine the scope of the simulation work area, determine the location of the volcanic channel and the location of the crater, design the shape and size of the proximal, middle and distal source phases, and construct a three-dimensional digital model of the volcanic structure;

[0081] (2) The bottom of the casting model is made of epoxy resin and talcum powder, and the mass ratio of epoxy resin, epoxy resin curing agent and talcum powder is 1:0.5:0.3;

[0082] (3) Complete the modeling of the proximal source phase, the mesogenic phase and the distal source phase respectively: 500g of epoxy resin, 250g of epoxy resin curing agent, 40g of the first high-speed material and 10g of the second high-speed material are fully mixed and vacuumized, and then the proximal source phase belt is cast. After solidification, a proximal source phase belt model with a central bulge and low surroundings is carved out by an engraving machine; 500g of epoxy resin, 250g of epoxy resin curing agent, 5g of the first high-speed material and 20g of the second high-speed material are fully mixed and vacuumized, and then the proximal source phase belt is cast. After solidification, a mesogenic phase belt model with a central bulge and low surroundings is carved out by an engraving machine; 500g of epoxy resin, 250g of epoxy resin curing agent and 10g of the second high-speed material are fully mixed and vacuumized, and then the distal source phase belt is cast. After solidification, a distal source phase belt model with a central bulge and low surroundings is carved out by an engraving machine. The model diagrams of the near-source phase belt, the middle-source phase belt and the far-source phase belt are obtained, such as Figure 2 As shown;

[0083] (4) The materials used are epoxy resin and silicone rubber. The mass ratio of epoxy resin, epoxy resin curing agent, silicone rubber, and silicone rubber curing agent is 1:0.5:0.5:0.025. The casting of the overlying formation on the model is completed, thereby completing the production of the model.

[0084] Comparative Example 1

[0085] A model was made according to the method of Example 1, except that no high-speed material was added during the model production process.

[0086] It can be seen by comparison that for the model made by using Example 1 of the present invention, the materials used in the overflow phase of the volcanic structure are the same. The difference is the particle diameter and content of the high-speed material contained therein, which can better simulate the physical property differences of different facies belts. In Comparative Example 1, no high-speed material was added, and it was impossible to distinguish and simulate the physical property differences of different facies belts.

[0087] In summary, the model established digitally according to the present invention is more intuitive and has stronger modifiability. At the same time, three-dimensional carving is carried out using the digital model to ensure that the superimposed relationship, shape, and size of the proximal facies belt, middle facies belt, and distal facies belt are accurately reflected.

[0088] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A method for making molds of the proximal facies, middle facies, and distal facies of a volcanic structure, characterized in that, The mold manufacturing method includes: S1. Construct a three-dimensional digital model of the volcanic mechanism in the area to be simulated. The three-dimensional digital model includes a digital model of the proximal facies belt, a digital model of the middle facies belt, and a digital model of the distal facies belt; S2. Select a high-speed material, crush and screen the high-speed material to obtain high-speed material powder. Among them, the speed of the high-speed material is 200-400 m / s higher than that of the overflow facies of the volcanic mechanism, and the density is greater than that of the overflow facies of the volcanic mechanism; S3. Use high-speed material powders with different particle sizes and contents, and use the epoxy resin-containing composition as the overflow facies for casting and molding. Perform three-dimensional carving according to the proximal facies belt digital model, middle facies belt digital model, and distal facies belt digital model obtained in step S1 to respectively produce a proximal facies belt model, a middle facies belt model, and a distal facies belt model.

2. The molding method according to claim 1, wherein, The specific steps of step S1 include: S11. Determine the size of the area to be simulated and the location of the volcanic crater. Among them, the volcanic crater is adjacent to the middle position of the area to be simulated, and the distal facies belt is included in the area to be simulated; S12. Respectively determine the geological parameters of the proximal facies belt, middle facies belt, and distal facies belt. The geological parameters include shape, scope, height, and superimposition relationship; S13. Complete digital modeling of the models determined in step S11 and step S12 in a modeling system and form a surface file that can be used for three-dimensional carving. Among them, the surface file includes three independent proximal facies belt carving files, middle facies belt carving files, and distal facies belt carving files.

3. The molding method according to claim 1 or 2, wherein In step S2, the high-speed material is an organic material, preferably a sugar polymer represented by the chemical formula (C6H 12 O6) n .

4. The molding method according to any one of claims 1 to 3, wherein The epoxy resin contained in the epoxy resin-containing composition is preferably epoxy resin E-51; And / or, the epoxy resin-containing composition contains an epoxy curing agent. Preferably, the epoxy curing agent is selected from basic curing agents, and preferably selected from amine-based basic curing agents; Preferably, the mass ratio of the epoxy resin to the epoxy resin curing agent is 1:0.4-0.

5.

5. The molding method according to any one of claims 1-4, wherein, In step S3, the method for manufacturing the proximal facies belt model specifically includes: Mix the epoxy resin-containing composition with high-speed material powder, perform vacuum pumping, and then perform casting and molding. Then perform three-dimensional carving according to the proximal facies belt digital model obtained in step S1 to obtain a proximal facies belt model. Among them, the high-speed material powder includes a first high-speed material powder and a second high-speed material powder. The average particle size of the first high-speed material powder is 500-700 μm, and the average particle size of the second high-speed material powder is 200-400 μm.

6. The molding method according to claim 5, wherein, The mass ratio of the epoxy resin contained in the epoxy resin-containing composition to the high-speed material powder is 1:0.08-0.12; And / or, the mass ratio of the first high-speed material powder to the second high-speed material powder is 1:0.2-0.

3.

7. The molding method according to any one of claims 1-4, wherein, In step S3, the method for manufacturing the middle facies belt model specifically includes: Mix the epoxy resin-containing composition with high-speed material powder. After evacuating the air, perform casting molding, and then perform three-dimensional engraving according to the digital model of the middle source phase belt obtained in step S1 to obtain the middle source phase belt model; wherein, the high-speed material powder includes the first high-speed material powder and the second high-speed material powder, the average particle size of the first high-speed material powder is 500-700 μm, and the average particle size of the second high-speed material powder is 200-400 μm.

8. The molding method according to claim 7, wherein, The mass ratio of the epoxy resin contained in the epoxy resin-containing composition to the high-speed material powder is 1:0.05-0.07; and / or, the mass ratio of the first high-speed material powder to the second high-speed material powder is 0.2-0.3:

1.

9. The molding method according to any one of claims 1-4, wherein, In step S3, the method for making the far source phase belt model specifically includes: Mix the epoxy resin-containing composition with high-speed material powder. After evacuating the air, perform casting molding, and then perform three-dimensional engraving according to the digital model of the far source phase belt obtained in step S1 to obtain the far source phase belt model; wherein, the high-speed material powder includes the second high-speed material powder, and the average particle size of the second high-speed material powder is 200-400 μm.

10. The molding method according to claim 9, wherein, The mass ratio of the epoxy resin contained in the epoxy resin-containing composition to the high-speed material powder is 1:0.015-0.

025.

11. The molding method according to any one of claims 1-10, wherein, Before step S1, the mold making method further includes: mixing epoxy resin, epoxy resin curing agent and talcum powder. Adding talcum powder is to increase the speed and density of the mixture, and perform casting molding to obtain the bottom of the model; wherein, the mass ratio of epoxy resin, epoxy resin curing agent and talcum powder is 1:0.5-0.6:0.3-0.

4.

12. The molding method according to any one of claims 1-11, wherein, After step S3, the mold making method further includes: mixing epoxy resin, epoxy resin curing agent, silicone rubber and silicone rubber curing agent. Adding silicone rubber is to reduce the speed and density of the mixture, and perform casting molding to obtain the overlying formation of the model; wherein, the mass ratio of epoxy resin, epoxy resin curing agent, silicone rubber and silicone rubber curing agent is 1:0.5-0.6:0.5-0.6:0.02-0.03.

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