CN112442274B - Composition for preparing seismic physical model, seismic physical model and preparation and construction methods - Google Patents
Composition for preparing seismic physical model, seismic physical model and preparation and construction methods Download PDFInfo
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- CN112442274B CN112442274B CN201910817585.9A CN201910817585A CN112442274B CN 112442274 B CN112442274 B CN 112442274B CN 201910817585 A CN201910817585 A CN 201910817585A CN 112442274 B CN112442274 B CN 112442274B
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Abstract
The invention belongs to the field of seismic physical models, and particularly relates to a geophysical seismic model which is mainly prepared from compositions such as epoxy resin, silica gel, reflective powder and the like, wherein the reflective powder is mixed in proportion by adopting different meshes, the longitudinal wave speed and the transverse wave speed of a model material are controlled by changing the content of each component, the longitudinal wave speed can be controlled to be changed in a gradient manner from 2000m/s to 4000m/s, and the transverse wave speed can be controlled to be changed in a gradient manner from 1000m/s to 2000 m/s. The model manufactured by adopting the geophysical seismic model composition and the manufacturing method has good penetrability and good reflectivity of laser receiving under the excitation of ultrasonic waves, can obtain good seismic wave reflection data when being applied and tested by physical simulation, and provides a new method for the research of seismic geologic bodies and laser ultrasonic propagation.
Description
Technical Field
The invention relates to the field of geophysical exploration, in particular to a reservoir model composition for simulating seismic acquisition in geophysical exploration and a preparation method of a reservoir model.
Background
The earthquake physical simulation is that field earthquake waves are simulated in a laboratory by utilizing ultrasonic waves, signals are excited and received by an ultrasonic transducer, the method is an effective means for researching the propagation rule of the earthquake waves, a physical model which accords with the actual geological structure or different reservoir types is manufactured in the laboratory, the kinematic and kinetic characteristics of the earthquake waves in the complex structure and the complex reservoir are researched, the material for manufacturing the physical model has certain geological characteristics, the earthquake physical model material is mainly synthesized by epoxy resin and silicon rubber in the present colleges and universities, the material sound wave propagation speed is changed by changing the proportion of the epoxy resin and the silicon rubber, the speed can be gradually changed from 1000m/s to 2600m/s, and the physical models with different speeds can be manufactured according to the requirement of the formation speed.
The laser ultrasonic receiving technology is that the material surface is pasted with a film for receiving, the research on a geophysical model simulated by pasting the film on the material surface obviously cannot truly reflect the acoustic wave characteristics of the material, particularly when the surface of the model material has different fluctuation changes, the film can not be completely pasted, namely when the surface of the model has low depression or bulge, the whole film can not be completely pasted and leveled, so that the pasting film is difficult to truly reflect the simulation of the geophysical model by reflecting laser.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a physical model material containing reflective powder and a preparation method thereof. The simulation reservoir stratum material with different longitudinal and transverse wave propagation speeds is manufactured by using the proportion of epoxy resin and silicon rubber and the proportion of the reflective powder with different meshes, adding other auxiliary agents, putting the mixed material into a mould for curing and molding, and changing the content of the silicon rubber and the proportion of the reflective powder with different meshes. The defect that the existing molding material cannot be directly used for laser reflection receiving is overcome, and after a model is manufactured by using a new simulation material, the ultrasonic wave reflected by the laser receiving ultrasonic wave is not received by a film pasting method, so that the laser ultrasonic receiving test device is used for laser ultrasonic receiving test of geophysical simulation experiments. The new simulated reservoir material has the characteristics of light reflection and better penetrability, and lays a foundation for the manufacture and the test of a seismic physical model.
One of the purposes of the invention is to provide a composition of a seismic physical model, which comprises reflective powder and a base material, wherein the base material is epoxy resin and an epoxy curing agent, and/or silica gel and a silica gel curing agent.
In some embodiments of the present invention, the reflective powder is glass beads.
The mass percentage of the reflective powder in the composition is 10% -90%, preferably 20% -80%, and more preferably 35% -50%.
In some embodiments of the present invention, the reflective powder includes a first reflective powder, a second reflective powder, and a third reflective powder, wherein the first reflective powder has a particle size in the range of 200-350 mesh, such as 250-320 mesh, the second reflective powder has a particle size in the range of 400-600 mesh, such as 450-550 mesh, and the third reflective powder has a particle size in the range of 700-900 mesh, such as 750-850 mesh.
In some embodiments of the present invention, the weight ratio of the first reflective powder, the second reflective powder and the third reflective powder is 1 (0.1-10): 0.1-10, preferably 1 (0.5-2): 0.5-2.
In some embodiments of the invention, the following components are included in parts by weight:
in some embodiments of the invention, the following components are included in parts by weight:
in some embodiments of the invention, the following components are included in parts by weight:
in some embodiments of the invention, the epoxy resin is E-51.
In some embodiments of the present invention, the epoxy curing agent and the silica gel curing agent are modified amine curing agents.
According to a preferred embodiment of the present invention, the epoxy curing agent and the silica gel curing agent are curing agents 2216.
In some embodiments of the invention, the silica gel is ST-107.
Another object of the present invention is to provide a seismic physical model using the composition of one of the objects
The third purpose of the invention is to provide a method for preparing a seismic physical model by using the second purpose, which comprises the following steps:
s1, weighing reflective powder and a base material;
s2, mixing the reflective powder with epoxy resin and/or silica gel to obtain a first mixture; mixing the first mixture with an epoxy curing agent and/or a silica gel curing agent to obtain a second mixture;
and S3, curing the second mixture.
When the material is prepared, if the amount of one component is 0, namely, the component is not added, the subsequent steps are skipped.
After 48 hours, the mold was disassembled and the cured physical model was removed. A physical simulation reservoir that can be used for laser received ultrasound was modeled.
The fourth purpose of the invention is to provide a method for building a seismic physical model by using the second purpose, which comprises the following steps:
firstly, determining parameters such as longitudinal and transverse wave speeds of a simulated target horizon according to a research target;
then, according to the geological structure interpretation design model, determining the geometric similarity ratio and the dynamic similarity ratio of the model;
then selecting a proper material formula aiming at a target layer of the reservoir;
after the formula is determined, a model is manufactured according to the model manufacturing step, the model is demoulded after being solidified, the model parameters of the layer are measured after the demould, and the physical simulation laser receiving ultrasonic test is carried out after the requirements are met.
The invention has the beneficial effects that:
the invention firstly tries to add the reflecting powder into the geophysical model for simulation, is used for seismic physical simulation, develops a new reservoir model manufacturing method, and is successfully applied to the manufacture of the laser receiving ultrasonic seismic physical model. The geophysical model has good penetrability, and can obtain effective reflection signals; the laser has the characteristic of high light reflection, and can reflect ultrasonic signals to facilitate laser receiving.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram showing the velocity distribution of longitudinal and transverse waves of a geophysical model material according to an embodiment of the present invention, in which the velocity of longitudinal waves is gradually changed from 2000m/s to 4000m/s and the velocity of transverse waves is gradually changed from 1000m/s to 2000 m/s.
Detailed Description
The present invention will be described in detail below with reference to the drawings and examples, but the present invention is not limited to the examples.
The following are materials and auxiliaries used in the examples:
light-reflecting powder: the components are glass beads which are 300 meshes, 500 meshes and 800 meshes in rule and are produced by Guangdong Fushan XiuCai chemical industry Co.
The size of the prepared model is 30 x 20 x 5cm, the testing method is an ultrasonic transducer transmission method, and the wave speed is calculated according to the thickness and the first arrival time length received by the ultrasonic transducer.
Example 1:
second layer of physical model of certain area: reservoir target stratum simulation speed design Vp =2000m/s and Vs =1000m/s
Calculated according to the parts by weight.
Example 2:
second layer of physical model of certain area: reservoir destination layer simulation speed design Vp =2600m/s and Vs =1400m/s
Calculated according to the parts by weight.
Example 3:
second layer of physical model of certain area: reservoir target layer simulation speed design Vp =3000m/s, vs =1700m/s
Calculated according to the parts by weight.
Example 4:
second layer of physical model of certain area: reservoir target stratum simulation speed design Vp =3800m/s and Vs =1900m/s
Calculated according to the parts by weight.
Example 5:
first layer of physical model of certain area: reservoir target layer simulation speed design Vp =4000m/s and Vs =2000m/s
Calculated according to the parts by weight.
Comparative example 1
The same procedure as in example 2 was repeated except that 2216 epoxy resin curing agent was used and mixed and cured in the amount of 50% of the epoxy resin in use. The curing agent has the defects that the heat release is fast, the heat cannot be released in time due to the fact that the thickness of the curing agent exceeds 5cm, bubbles appear in the middle of a sample, and therefore, the curing agent cannot be used for manufacturing a model with the thickness of more than 5cm
The model material is used for the surface layer of a physical earthquake model, enhances the strength of the surface layer, plays a role in increasing the excitation strength in laser ultrasonic excitation and effectively resisting cladding, plays a role in reflecting light on the surface in laser Doppler vibration measurement and reception, and effectively enhances the received signals.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (11)
1. A seismic physical model is composed of reflective powder and a base material, wherein the base material is epoxy resin and an epoxy curing agent, and/or silica gel and a silica gel curing agent;
the reflecting powder is glass beads, and the mass percentage of the reflecting powder in the model is 10% -90%;
the reflective powder comprises first reflective powder, second reflective powder and third reflective powder, wherein the particle size of the first reflective powder is within the range of 200-350 meshes, the particle size of the second reflective powder is within the range of 400-600 meshes, and the particle size of the third reflective powder is within the range of 700-900 meshes.
2. The model of claim 1, wherein the reflective powder is present in the model in an amount of 20% to 80% by weight.
3. The model of claim 2, wherein the reflective powder is present in the model in an amount of 35% to 50% by weight.
4. The model of claim 1, wherein the first reflective powder has a particle size in the range of 250-320 mesh, the second reflective powder has a particle size in the range of 450-550 mesh, and the third reflective powder has a particle size in the range of 750-850 mesh.
5. The model of claim 1, wherein the weight ratio of the first reflective powder, the second reflective powder and the third reflective powder is 1 (0.1-10) to (0.1-10).
6. The model of claim 5, wherein the weight ratio of the first reflective powder, the second reflective powder and the third reflective powder is 1 (0.5-2) to (0.5-2).
7. The model of claim 1, comprising the following components in parts by weight:
8. the model of claim 7, comprising the following components in parts by weight:
the dosage of the first reflective powder is 800-1500 parts by weight;
the dosage of the second reflective powder is 800-1500 parts by weight;
the dosage of the third reflective powder is 800-1500 parts by weight.
9. A former as claimed in any one of claims 1 to 3 wherein the epoxy resin is E-51; and/or the epoxy curing agent is a modified amine curing agent; and/or the silica gel is ST-107.
10. A method of making a seismic physical model according to any of claims 1 to 9, comprising the steps of:
s1, weighing reflective powder and a base material;
s2, mixing the reflective powder with epoxy resin and/or silica gel to obtain a first mixture; mixing the first mixture with an epoxy curing agent and/or a silica gel curing agent to obtain a second mixture;
and S3, curing the second mixture.
11. A method of constructing a seismic physical model according to any of claims 1 to 9, comprising the steps of:
firstly, determining the longitudinal and transverse wave speeds of a simulated target horizon according to a research target;
then, according to the geological structure interpretation design model, determining the geometric similarity ratio and the dynamic similarity ratio of the model;
then selecting a proper material formula aiming at a target layer of the reservoir;
after the formula is determined, a model is manufactured according to the model manufacturing step, the model is demoulded after being solidified, the model parameters of the layer are measured after the demould, and the physical simulation laser receiving ultrasonic test is carried out after the requirements are met.
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| CN102443245A (en) * | 2010-10-12 | 2012-05-09 | 中国石油化工股份有限公司 | Earthquake physical model and preparation method and application thereof |
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| JP5664560B2 (en) * | 2011-01-26 | 2015-02-04 | 信越化学工業株式会社 | Light diffusing dimethyl silicone rubber composition |
| CN106317894B (en) * | 2015-06-30 | 2019-03-29 | 比亚迪股份有限公司 | Silicon composition, reflecting coating and preparation method thereof and the photovoltaic module including it |
| CN105968818A (en) * | 2016-03-14 | 2016-09-28 | 安徽电缆股份有限公司 | A fireproof fire-resistant silicone rubber cable material |
| CN107828310A (en) * | 2017-11-15 | 2018-03-23 | 合肥华福土工合成材料有限公司 | A kind of high brightness wide angle refecting material and preparation method thereof |
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