Earthquake physical model material composition, earthquake physical model material, preparation method and application

Abstract

The invention belongs to the field of ultrasonic seismic physical model technology research, and discloses a seismic physical model material composition, a seismic physical model material, a preparation method and application. The composition comprises the following components in parts by weight: 5-45 parts by weight of hollow glass beads; 90-220 parts by weight of sea sand; 10-25 parts by weight of kaolin; 8-12 parts by weight of epoxy resin; and 1-3 parts by weight of a curing agent. The seismic physical model material provided by the invention has very high similarity with an actual seabed sediment natural gas hydrate reservoir, and can be used for physical simulation of such reservoirs.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultrasonic seismic physical model research, and more specifically, relates to a seismic physical model material composition, a seismic physical model material, a preparation method and an application thereof. Background Art

[0002] Seismic physical simulation is a forward simulation method that makes a physical model of the actual formation structure or geological body in a laboratory at a certain scale similarity ratio using corresponding materials and simulates the acquisition of field seismic exploration by ultrasonic testing methods. Currently, the most commonly used materials for seismic physical models are moldable materials, that is, mixtures of some liquid or powder materials are turned into solids by adding curing agents or changing the temperature. Such model materials have good uniformity and plasticity and can conveniently make physical models of complex structures. Existing technologies mostly use the method of mixing inorganic substances such as epoxy resin, silicone rubber and talcum powder. In addition, when conducting reservoir physical simulation, artificial rock can also be used as a model material. The velocity value range of existing seismic physical simulation materials is usually between 1000 m / s and 4000 m / s, and the density range is between 1.1 g / cm 3 to 2.6 g / cm 3 Moreover, the density and velocity of the model material usually show a linear variation relationship, that is, when the velocity of the seismic physical model material is greater than 2200 m / s, the density usually exceeds 1.6 g / cm 3 .

[0003] The velocity of submarine sediments is usually 1200 - 1600 m / s, and the density is about 1.4 g / cm 3 . The velocity of natural gas hydrates is usually 2000 - 3600 m / s, and the density is 0.8 - 0.9 g / cm 3 . Data shows that the equivalent velocity of natural gas hydrate reservoirs developed in submarine sediments is usually 2200 - 2800 m / s, and the density is 1.2 - 1.4 g / cm 3 , featuring significant characteristics of high velocity and low density. For existing seismic physical model materials, when the velocity varies from 2200 - 2800 m / s, the density range is usually 1.6 - 2.2 g / cm 3 , which is much higher than the density of the actual submarine sediment natural gas hydrate reservoir, making it difficult to conduct high-similarity physical simulation.

[0004] In summary, how to achieve a model material with a relatively high velocity and a relatively low density is the key to determining whether the physical model technology can perform high-similarity physical simulation on submarine sediment natural gas hydrate reservoirs, and is also related to the long-term development of seismic physical model technology. Summary of the Invention

[0005] The object of the present invention is to provide a seismic physical model material composition, a seismic physical model material, a preparation method and an application thereof in view of the deficiencies of the prior art. The seismic physical model material of the present invention has a high similarity with the actual submarine sediment natural gas hydrate reservoir and can be used for physical simulation of such reservoirs.

[0006] To achieve the above object, in the first aspect of the present invention, a seismic physical model material composition is provided, and the composition comprises the following components in parts by weight:

[0007]

[0008] In the second aspect of the present invention, a method for preparing a seismic physical model material by using the above composition is provided, and the method comprises the following steps:

[0009] S1: Preheat epoxy resin and curing agent;

[0010] S2: Mix the preheated epoxy resin and curing agent with hollow glass microspheres, sea sand and kaolin uniformly to obtain a mixed material;

[0011] S3: Inject the mixed material into a mold and press it by a press, and then obtain the seismic physical model material after curing treatment.

[0012] In the third aspect of the present invention, a seismic physical model material prepared by the above method is provided.

[0013] In the fourth aspect of the present invention, an application of the seismic physical model material in physical simulation of submarine sediment natural gas hydrate reservoirs is provided.

[0014] The beneficial effects of the technical solution of the present invention are as follows:

[0015] (1) The seismic physical model material composition of the present invention has the characteristics of high velocity and low density. By changing the ratio of different materials in the composition, when the velocity of the prepared seismic physical model material changes from 2000 m / s to 2800 m / s, the density changes from 1 g / cm 3 to 1.4 g / cm 3 , which is much lower than the density of the existing physical model materials.

[0016] (2) The seismic physical model material of the present invention has a high similarity with the actual submarine sediment natural gas hydrate reservoir and can be used for physical simulation of such reservoirs.

[0017] Other features and advantages of the present invention will be described in detail in the following specific implementation manner. Description of the Drawings

[0018] The above and other objects, features, and advantages of the present invention will become more apparent by describing the exemplary embodiments of the present invention in more detail with reference to the accompanying drawings, in which, in the exemplary embodiments of the present invention, the same reference numerals generally represent the same components.

[0019] Figure 1 The flowchart shows a method for preparing seismic physical model materials using the composition described in Example 1 of the present invention.

[0020] Figure 2 The diagram shows the variation of the velocity of the seismic physical model materials provided in Examples 1-7 of the present invention with the weight parts of hollow glass microspheres.

[0021] Figure 3 The diagram shows the variation of the density of the seismic physical model materials provided in Examples 1-7 of the present invention with the weight parts of hollow glass microspheres. Detailed Embodiments

[0022] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0023] The first aspect of the present invention provides a composition for seismic physical model materials, the composition comprising the following components in parts by weight:

[0024]

[0025] According to the present invention, preferably, the composition comprises the following components in parts by weight:

[0026]

[0027] According to the present invention, preferably, the hollow glass microspheres have a density of less than 0.39 g / cm 3 , a particle size of 100-200 mesh, and a compressive strength greater than 5 MPa.

[0028] In the present invention, the seismic physical model material composition of the present invention has the characteristics of high velocity and low density. The principle is that hollow glass microspheres are introduced into the model material composition. After being mixed with other materials in the composition and then pressed and cured, a new physical model material with the characteristics of high velocity and low density can be obtained. After the hollow glass microspheres are mixed and cured with other materials in the composition, good particle contact can enable the seismic physical model material composition of the present invention to have a relatively high acoustic wave propagation velocity. However, due to the extremely low density of the hollow glass microspheres, it can effectively reduce the overall density of the seismic physical model material composition of the present invention. By changing the ratio of different materials in the composition, when the velocity of the obtained seismic physical model material changes from 2000 m / s to 2800 m / s, the density changes from 1 g / cm 3 to 1.4 g / cm 3 , which is much lower than the density of the existing physical model materials.

[0029] According to the present invention, preferably, the sea sand is natural sea sand with a particle size of 100-200 mesh.

[0030] According to the present invention, preferably, the kaolin is kaolin with a particle size of 300-400 mesh.

[0031] According to the present invention, preferably, the epoxy resin is an epoxy resin with a viscosity in the range of 9000-13000 mPa·s. Further preferably, the epoxy resin is at least one of E-51 type epoxy resin, E-44 type epoxy resin and E-55 type epoxy resin.

[0032] According to the present invention, preferably, the curing agent is an amine curing agent with an amine value less than 400 mgKOH / g. Further preferably, the curing agent is at least one of cashew oil modified aliphatic amine curing agent, aromatic curing agent and organic acid curing agent.

[0033] The second aspect of the present invention provides a method for preparing a seismic physical model material using the above composition. The method includes the following steps:

[0034] S1: Preheat the epoxy resin and the curing agent;

[0035] S2: Mix the preheated epoxy resin and curing agent with hollow glass microspheres, sea sand and kaolin evenly to obtain a mixed material;

[0036] S3: Inject the mixed material into a mold and press it using a press, and then obtain the seismic physical model material through curing treatment.

[0037] In the present invention, the method further includes a step of treating the mold before injecting the mixed material into the mold, that is, evenly applying a mold release agent on the inner surface of the mold.

[0038] According to the present invention, preferably, in step S1, the preheating time is 12 - 36 h, and the preheating temperature is 40 - 50 °C.

[0039] According to the present invention, preferably, in step S3, the pressure of the press is 0.5 - 4 MPa; the curing time is 36 - 60 h, and the curing temperature is 40 - 50 °C.

[0040] The third aspect of the present invention provides the seismic physical model material prepared by the method described above.

[0041] According to the present invention, preferably, the velocity of the seismic physical model material is 2200 - 2800 m / s, and the density is 1 - 1.4 g / cm 3 。

[0042] The fourth aspect of the present invention provides the application of the seismic physical model material in the physical simulation of natural gas hydrate reservoirs in submarine sediments.

[0043] The present invention will be specifically described below through examples and comparative examples.

[0044] In the following various examples and comparative examples:

[0045] Hollow glass microspheres: Hollow glass microspheres JY35, produced by Henan Jieyang New Materials Co., Ltd., with a density of 0.35 g / cm 3 , a particle size of 140 mesh, and a compressive strength of 25 MPa.

[0046] Sea sand: Produced by Zhuochuan Mineral Products Processing Factory in Lingshou County, Shijiazhuang, with a particle size of 140 mesh.

[0047] Kaolin: Produced by Zhuochuan Mineral Products Processing Factory in Lingshou County, Shijiazhuang, with a particle size of 300 mesh.

[0048] Epoxy resin: Epoxy resin E - 51, produced by Shanghai Resin Factory.

[0049] Curing agent: Cashew oil - modified aliphatic amine ZY - F50; amine value: 200 - 300 mgKOH / g; produced by Xuzhou Zhongyan Chemical Co., Ltd.

[0050] Example 1

[0051] This example provides a seismic physical model material composition, and the composition includes the following components in parts by weight:

[0052]

[0053] This example also uses the above composition to prepare a seismic physical model material, as Figure 1 shown, and the preparation method includes the following steps:

[0054] Step S1, Material Preparation: Place the epoxy resin and curing agent in an incubator at 45°C and preheat for 24 hours;

[0055] Step S2, Mold Treatment: Evenly apply a release agent to the inner surface of the physical model curing mold;

[0056] Step S3, Material Mixing: Weigh the preheated epoxy resin, curing agent, hollow glass microspheres, sea sand, and kaolin according to the formula requirements and mix them thoroughly to obtain a mixed material;

[0057] Step S4, Pressing: Inject the mixed material into the physical model curing mold treated in Step S2 and use a press for pressing. The pressure of the press is 1 MPa;

[0058] Step S5, Curing Process: After removing the pressure of the press, place the mold in an incubator at 45°C for curing for 48 hours, and then demold and take out to complete the production of the model material and obtain the seismic physical model material.

[0059] Example Two

[0060] This example provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this example and Example One is only that the weight portion of the hollow glass microspheres is different, which is 15 weight portions. See Table 1 for details.

[0061] Example Three

[0062] This example provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this example and Example One is only that the weight portion of the hollow glass microspheres is different, which is 20 weight portions. See Table 1 for details.

[0063] Example Four

[0064] This example provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this example and Example One is only that the weight portion of the hollow glass microspheres is different, which is 25 weight portions. See Table 1 for details.

[0065] Example Five

[0066] This example provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this example and Example One is only that the weight portion of the hollow glass microspheres is different, which is 30 weight portions. See Table 1 for details.

[0067] Example Six

[0068] This embodiment provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this embodiment and the first embodiment is only that the weight portion of hollow glass microspheres is different, which is 35 weight portions, as shown in Table 1 specifically.

[0069] Example Seven

[0070] This embodiment provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this embodiment and the first embodiment is only that the weight portion of hollow glass microspheres is different, which is 40 weight portions, as shown in Table 1 specifically.

[0071] Example Eight

[0072] This embodiment provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this embodiment and the first embodiment is only that the dosages of each component in the composition are different and the pressing pressure in the preparation method is different. Specifically:

[0073] The composition includes the following components in weight portions:

[0074]

[0075] The method for preparing a seismic physical model material using the above composition includes the following steps:

[0076] Step S1, material preparation: Place epoxy resin and curing agent in a 45°C incubator and preheat for 24 hours;

[0077] Step S2, mold treatment: Uniformly apply a release agent on the inner surface of the physical model curing mold;

[0078] Step S3, material mixing: Weigh the preheated epoxy resin, curing agent, hollow glass microspheres, sea sand, and kaolin according to the formula requirements and mix them thoroughly to obtain a mixed material;

[0079] Step S4, press pressing: Inject the mixed material into the physical model curing mold treated in Step S2 and use a press for pressing. The pressure of the press is 0.5 MPa;

[0080] Step S5, curing process: After removing the pressure of the press, place the mold in a 45°C incubator and cure for 48 hours, then demold and take out to complete the production of the model material and obtain the seismic physical model material.

[0081] Example Nine

[0082] This embodiment provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this embodiment and the first embodiment is only that the dosages of each component in the composition are different. Specifically:

[0083] The composition comprises the following components in parts by weight:

[0084]

[0085] Example Ten

[0086] This example provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this example and Example One is only that the dosages of the components in the composition are different and the pressing pressure in the preparation method is different. Specifically:

[0087] The composition comprises the following components in parts by weight:

[0088]

[0089] The method for preparing a seismic physical model material using the above composition comprises the following steps:

[0090] Step S1, material preparation: Preheat epoxy resin and curing agent in an incubator at 45 °C for 24 hours;

[0091] Step S2, mold treatment: Uniformly apply a release agent to the inner surface of the physical model curing mold;

[0092] Step S3, material mixing: Weigh the preheated epoxy resin, curing agent, hollow glass microspheres, sea sand, and kaolin according to the formula requirements and mix them thoroughly to obtain a mixed material;

[0093] Step S4, press pressing: Inject the mixed material into the physical model curing mold treated in Step S2 and press it using a press. The pressure of the press is 1.5 MPa;

[0094] Step S5, curing process: After removing the pressure of the press, place the mold in an incubator at 45 °C for curing for 48 hours, and then demold and take out to complete the production of the model material and obtain the seismic physical model material.

[0095] Example Eleven

[0096] This example provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this example and Example One is only that the dosages of the components in the composition are different and the pressing pressure in the preparation method is different. Specifically:

[0097] The composition comprises the following components in parts by weight:

[0098]

[0099] A method for preparing seismic physical model materials using the above-mentioned composition comprises the following steps:

[0100] Step S1, material preparation: Place the epoxy resin and curing agent in an incubator at 45°C and preheat for 24 hours;

[0101] Step S2, mold treatment: Uniformly apply a release agent to the inner surface of the physical model curing mold;

[0102] Step S3, material mixing: Weigh the preheated epoxy resin, curing agent, hollow glass microspheres, sea sand, and kaolin according to the formula requirements and mix them thoroughly to obtain a mixed material;

[0103] Step S4, press pressing: Inject the mixed material into the physical model curing mold treated in Step S2 and use a press for pressing. The pressure of the press is 2 MPa;

[0104] Step S5, curing process: After removing the pressure of the press, place the mold in an incubator at 45°C for curing for 48 hours, and then demold and take out to complete the production of the model material and obtain the seismic physical model material.

[0105] Example Twelve

[0106] This example provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this example and Example One is only that: the dosages of each component in the composition are different and the pressing pressure in the preparation method is different. Specifically:

[0107] The composition comprises the following components in parts by weight:

[0108]

[0109] A method for preparing seismic physical model materials using the above-mentioned composition comprises the following steps:

[0110] Step S1, material preparation: Place the epoxy resin and curing agent in an incubator at 45°C and preheat for 24 hours;

[0111] Step S2, mold treatment: Uniformly apply a release agent to the inner surface of the physical model curing mold;

[0112] Step S3, material mixing: Weigh the preheated epoxy resin, curing agent, hollow glass microspheres, sea sand, and kaolin according to the formula requirements and mix them thoroughly to obtain a mixed material;

[0113] Step S4, press pressing: Inject the mixed material into the physical model curing mold treated in Step S2 and use a press for pressing. The pressure of the press is 2 MPa;

[0114] Step S5, Curing Process: After releasing the pressure of the press, place the mold in an incubator at 45°C for 48 hours of curing, then demold and take it out, thus completing the production of the model material and obtaining the seismic physical model material.

[0115] Comparative Example 1

[0116] This comparative example provides a seismic physical model material composition and a seismic physical model material prepared using the composition. The difference between this comparative example and Example 1 is only that: the dosages of each component in the composition are different and the pressing pressure in the preparation method is different. Specifically:

[0117] The composition includes the following components in parts by weight:

[0118]

[0119] The method for preparing a seismic physical model material using the above composition includes the following steps:

[0120] Step S1, Material Preparation: Place the epoxy resin and curing agent in an incubator at 45°C for preheating for 24 hours;

[0121] Step S2, Mold Treatment: Uniformly apply a release agent on the inner surface of the physical model curing mold;

[0122] Step S3, Material Mixing: Weigh the preheated epoxy resin, curing agent, hollow glass microspheres, sea sand, and kaolin according to the formula requirements and mix them evenly to obtain a mixed material;

[0123] Step S4, Pressing by Press: Inject the mixed material into the physical model curing mold processed in Step S2 and use a press for pressing. The pressure of the press is 2 MPa;

[0124] Step S5, Curing Process: After releasing the pressure of the press, place the mold in an incubator at 45°C for 48 hours of curing, then demold and take it out, thus completing the production of the model material and obtaining the seismic physical model material.

[0125] Test Example

[0126] This test example tests the seismic physical model materials of Examples 1 to 12 and Comparative Example 1, including:

[0127] Measure the velocity (both longitudinal wave velocities) using the ultrasonic transmission method;

[0128] Measure the density using the weighing method.

[0129] The results are shown in Table 1, where each component in Table 1 is in parts by weight.

[0130] Table 1

[0131]

[0132] As can be seen from Table 1:

[0133] By changing the ratios of different materials in the composition, the velocity of the seismic physical model material obtained by the present invention can vary from 2000 m / s to 2800 m / s, and the density can vary from 1 g / cm 3 to 1.4 g / cm 3 , which is much lower than the density of existing physical model materials.

[0134] The embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An earthquake physics model material composition, characterized in that: The composition comprises the following components in parts by weight:

2. The earthquake physics model material composition according to claim 1, wherein: The composition comprises the following components in parts by weight:

3. The earthquake physics model material composition according to claim 1 or 2, wherein: The hollow glass microsphere has a density of less than 0.39 g / cm 3 , hollow glass microspheres with a particle size of 100-200 mesh and a compressive strength greater than 5MPa; The sea sand is natural sea sand with a particle size of 100-200 mesh; The kaolin is kaolin with a particle size of 300-400 mesh; The epoxy resin has a viscosity in the range of 9000-13000 mPa·s; The curing agent is an amine curing agent with an amine value less than 400 mgKOH / g.

4. The earthquake physics model material composition according to claim 3, wherein: The epoxy resin is at least one of E-51 epoxy resin, E-44 epoxy resin and E-55 epoxy resin; The curing agent is at least one of a cashew nut oil-modified fatty amine curing agent, an aromatic curing agent and an organic acid curing agent.

5. A method for preparing an earthquake physical model material using the composition according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: S1: Preheat epoxy resin and curing agent; S2: uniformly mixing the preheated epoxy resin and curing agent with the hollow glass microspheres, sea sand and kaolin to obtain a mixed material; S3: injecting the mixed material into a mold and pressing it with a press, and then curing it to obtain the earthquake physical model material.

6. The method according to claim 5, wherein: In step S1, the preheating time is 12-36 hours, and the preheating temperature is 40-50°C.

7. The method according to claim 5, wherein: In step S3, the pressure of the press is 0.5-4 MPa; the time of the curing treatment is 36-60 hours; and the temperature of the curing treatment is 40-50°C.

8. The earthquake physics model material prepared by the method according to any one of claims 5 to 7.

9. The earthquake physics model material according to claim 8, wherein: The velocity of the earthquake physics model material is 2200-2800 m / s and the density is 1-1.4 g / cm 3 .

10. Use of the seismic physical model material according to claim 8 or 9 in physical simulation of natural gas hydrate reservoirs in seafloor sediments.

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