CN117110073A - Physical simulation experiment method for earthquake induced by hydraulic fracturing of dry-hot rock - Google Patents
Physical simulation experiment method for earthquake induced by hydraulic fracturing of dry-hot rock Download PDFInfo
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
- G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
Abstract
The invention provides a physical simulation experiment method for a dry-hot rock hydraulic fracturing induced earthquake, which comprises the following steps: (1) Collecting outdoor granite outcrop, processing the outdoor granite outcrop into a cube sample, and completing sample processing by matching with a hydraulic fracturing test system; (2) Cutting off a part of a sample based on a geological model containing faults constructed by three-dimensional seismic exploration, and sticking the cut part back to the original place to construct an artificial fault; (3) Placing a sample in an indoor hydraulic fracturing test system, applying different temperatures, simulating ground stress and pumping flow, carrying out a hydraulic fracturing test, and adopting acoustic emission to monitor a fracturing process; (4) And analyzing acoustic emission monitoring data by combining moment tensor inversion to reveal an influence mechanism of the hydraulic fracturing process on artificial fault. The invention can obviously improve the efficiency and accuracy of the dry-hot rock hydraulic fracturing physical simulation experiment, and can more accurately simulate the fault sliding caused by the dry-hot rock fracturing under the laboratory condition.
Description
Technical Field
The invention relates to the field of clean energy development, in particular to a physical simulation experiment method for earthquake induced by hydraulic fracturing of dry-hot rock.
Background
The dry hot rock geothermal energy is used as a clean energy source with large reserve, and gradually influences the world energy pattern under the increasingly severe environment-friendly situation, and becomes the focus of attention of academia and enterprises. The core of the method is to drill well into a reservoir and fracture the reservoir to form a crack network with a certain scale, and to construct a circulation loop of an injection well and a production well to extract heat energy for power generation. However, inducing earthquakes has become a key factor in constraining the development of dry-hot rock, mainly due to the activation of well Zhou Duanceng by hydraulic fracturing. In order to develop the geothermal resource of the dry-hot rock more safely, the hydraulic fracturing induced earthquake mechanism of the dry-hot rock needs to be clearly understood. A great number of experiments are needed for researching the mechanism of hydraulic fracturing, and the induced earthquake mechanism of faults with different occurrence and different properties under the condition of hydraulic fracturing is researched. Because the fracturing induced earthquake cannot be simulated in situ, it is more important to develop a physical simulation experiment method for the hydraulic fracturing induced earthquake of the dry hot rock.
In view of this, in chinese patent CN202011231661.7, a test method for studying hydraulic fracture induced fracture activation is disclosed, which performs a hydraulic fracture test under true triaxial confining pressure conditions by making a fracture in a rock sample and filling the fracture with a material such as gypsum, cement or resin. The influence and mechanism of different filling materials and different fracturing parameters, such as injection pressure, viscosity coefficient of flow fracturing fluid, injection frequency, time and the like, on water injection induced earthquake are discussed. However, the method only aims at rectangular rock samples with the size of 75 multiplied by 150 mm, and can only simulate crack propagation near the shaft end, and meanwhile, the sample also limits the action range of hydraulic cracks and a 'fracture surface'; secondly, faults with different occurrence patterns and different properties have obvious differences on the influence of induced earthquake, namely, the relative positions between the faults and the simulated well bores are not considered by the invention; finally, the filling of the fracture with gypsum, cement, etc. materials proposed in this patent will change the coefficient of friction of the "fracture face" affecting the relationship of the hydraulic fracture to it. In addition, the distance and the mechanism of the fault sliding are difficult to determine by only utilizing the acoustic emission parameters and the waveform information, and a seismic source mechanism of the fault sliding is needed to be obtained by matching with moment tensor inversion.
In view of the above, further improvements in the prior art are necessary.
Disclosure of Invention
Aiming at the problems in the background art, the invention provides a dry hot rock hydraulic fracturing induced earthquake physical simulation experiment method which is reasonable in conception, can obviously improve the efficiency and accuracy of the dry hot rock hydraulic fracturing physical simulation experiment, and can more accurately simulate fault sliding caused by dry hot rock fracturing under laboratory conditions.
In order to solve the technical problems, the invention provides a physical simulation experiment method for inducing earthquake by hydraulic fracturing of dry-hot rock, which specifically comprises the following steps:
(1) Collecting field granite outcrop, processing the field granite outcrop into a cube sample, and then completing sample processing by matching with a hydraulic fracturing test system;
(2) Cutting off a part of a sample based on a geological model containing faults constructed by three-dimensional seismic exploration, and then sticking the cut part back to the original place by adopting epoxy resin reinforced glue so as to construct artificial faults;
(3) Placing a sample in an indoor hydraulic fracturing test system, applying different temperatures, simulating ground stress and pumping flow, performing a hydraulic fracturing experiment, and monitoring a fracturing process by adopting acoustic emission;
(4) And analyzing acoustic emission monitoring data by combining moment tensor inversion to reveal an influence mechanism of the hydraulic fracturing process on artificial fault.
The hydraulic fracturing induced earthquake physical simulation experiment method for the dry-hot rock comprises the following specific processes of sample processing in the step (1): drilling a hole in the sample at the center of one end face of the cube sample, and presetting an injection steel pipe with internal threads at the top end, closed bottom end and slots at the side end in the hole to be used as fracturing fluid to be injected into a simulated shaft; and sealing and fixing the annular gap between the injection steel pipe and the drilling hole by adopting epoxy resin bar planting glue, and performing the next step after the epoxy resin bar planting glue is completely solidified.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following steps: when the injection steel pipe is sealed by the epoxy resin bar planting glue, the slots are filled with water absorbing paper so as to prevent the epoxy resin bar planting glue from flowing into the injection steel pipe to influence the fracturing experiment.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following steps: the epoxy resin bar planting glue is firstly injected into the drill hole to a half position of the drill hole, and then the injected steel pipe is inserted into the drill hole filled with half of the epoxy resin bar planting glue.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following steps: the drilling is to drill the inside of the sample to the position of 2/3 of the side length of the sample, and the aperture is 5-6 cm; the width of the slit is 5-6 mm, and the length of the slit is 30-40 mm; and the exposed end face of the sample at the upper part of the injection steel pipe is 1-2 cm.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following steps: the dimensions of the cubic sample in step (1) are at least 300mm by 300mm.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following specific processes of: firstly, carrying out mathematical modeling on a cube sample, and selecting a certain vertex as a coordinate origin, so that any point in the sample can be represented by coordinate points (x, y, z); secondly, designing parameters of the cut-out part of the sample; and finally, re-adhering the cut part to the original position by using the epoxy resin bar planting glue, and carrying out experiments when the epoxy resin bar planting glue is completely solidified.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following steps: the parameters comprise the intersection point coordinates of the cutting part and the boundary of the sample, the phase angle between the cutting part and the plane formed by the cutting seam and the center of the injection steel pipe, the distance between the cutting part and the injection steel pipe, the included angle between the cutting part and the straight line of the injection steel pipe, and the size and the position of the cutting surface; the included angle between the plane where the slots and the central line of the injection steel pipe are located together and the fault plane is 30-90 degrees.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following steps: and (2) cutting off a part of the sample, brushing a small amount of epoxy resin bar planting glue on the section to re-bond the section and the cut part, and simulating artificial fault by using a cementing surface.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following steps: the temperature in the step (3) is consistent with the temperature of the hot dry rock thermal reservoir, and the distribution range is 150-300 ℃; the simulated ground stress cannot be applied according to the actual stress, the simulated ground stress is applied according to the actual stress difference coefficient, the distribution range is between 0.2 and 0.7, and the size is between 5 and 40 MPa; the injection flow rate is determined to be 5 mL/min-100 mL/min according to an experimental instrument; the acoustic emission is monitored by 8 channels, and 16 acoustic emission probes are uniformly distributed on the periphery of the sample.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following steps: because the acoustic emission probe is easy to receive signals at high temperature and is not aligned, a heat insulation device is needed to be arranged between the acoustic emission probe and the test sample.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following steps: and (3) applying different temperatures according to the configuration of the hydraulic fracturing test system, wherein part of the hydraulic fracturing test system is used for slowly heating the sample outside the hydraulic fracturing test system and then placing the sample in the hydraulic fracturing test system, and the other part of the hydraulic fracturing test system is used for placing the sample in the hydraulic fracturing test system and then heating the sample to the set temperature.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following specific processes of: based on the acquired acoustic emission original waveform data, accurately positioning an acoustic emission event, and calculating energy parameters such as event energy level, root mean square amplitude and the like; further carrying out inversion of a moment tensor of a seismic source mechanism based on the amplitude and the polarity of the P wave to obtain a fracture mechanism of an inversion event and morphological parameters of a fracture surface; and analyzing the influence of different fracturing parameters on the slip quantity of the fault and the release energy.
The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method comprises the following steps: in the step (4), moment tensor inversion is adopted to obtain the energy released by sliding of a fault, the sliding distance and the fracture mode.
By adopting the technical scheme, the invention has the following beneficial effects:
compared with the method for simulating an artificial fault by cutting a groove in a cube sample, the method for simulating the earthquake physical simulation experiment induced by the hydraulic fracturing of the dry hot rock has the advantages that the conception is reasonable, the efficiency and the accuracy of the hydraulic fracturing physical simulation experiment of the dry hot rock can be remarkably improved, and the sliding similar to the actual fault sliding and the accompanying acoustic emission response can be generated after the hydraulic fracture is intersected with the artificial fault by the strategy of cutting firstly and then sticking back more easily, so that the fault sliding caused by the hydraulic fracture can be simulated more accurately under the laboratory condition.
The invention can simulate the process that the hydraulic fracturing of the dry-hot rock influences the fault slippage so as to induce earthquake indoors, and provides theoretical and experimental basis for the development of hydraulic fracturing parameters of the dry-hot rock.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a physical simulation experiment method for the hydraulic fracturing induced earthquake of the dry hot rock;
FIG. 2 is an indoor dry hot rock hydraulic fracturing induction earthquake physical model constructed based on a three-dimensional geological model in the dry hot rock hydraulic fracturing induction earthquake physical simulation experiment method of the invention;
FIG. 3 is a sample model represented in a rectangular coordinate system in the dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method of the invention;
FIG. 4 is a schematic diagram of a method for moment tensor inversion in the dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method.
Annotation:
in FIG. 2, a 2-1-site three-dimensional geologic model, a simulated fault of 2-2-post-bond interface, a 2-3-simulated wellbore (injection steel pipe), a 2-4-steel pipe slot, a 2-5-large-size granite sample containing artificial faults;
in FIG. 3, the bonded interfaces at 3-1-different angles are simulated faults, 3-2-acoustic emission probes, simulated wellbores (injection pipes) in 3-3-rectangular coordinates, and slots in 3-4-rectangular coordinates.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is further illustrated with reference to specific embodiments.
As shown in fig. 1, the method for simulating the physical earthquake induced by hydraulic fracturing of the dry-hot rock provided by the embodiment comprises the following steps:
s1, collecting outdoor large-size granite outcrop, processing the outdoor large-size granite outcrop to a cube sample with the size of at least 300mm multiplied by 300mm, and completing sample processing by matching with a hydraulic fracturing test system. The specific process is as follows: drilling a hole in the center of one end face of a cube sample to the position of 2/3 of the side length of the sample, wherein the hole diameter is 5-6 cm, presetting an injection steel pipe with internal threads at the top end, closed bottom end and slots at the side end as fracturing fluid to be injected into a simulated shaft, wherein the slots are 5-6 mm wide and 30-40 mm long, the upper part of the injection steel pipe is exposed out of the end face of the sample, 1-2 cm is reserved between the injection steel pipe and the hole, and the annular gap between the injection steel pipe and the hole is sealed and fixed by epoxy resin bar planting glue, and the next step can be carried out after the epoxy resin bar planting glue is completely solidified for more than 14 days. Referring to fig. 2, the granite outcrop retrieved from the target block is processed to 300mm x 300mm, drilled, 2-3 buried, glue injected, and cured as described above.
S2, cutting off a part of a sample based on a geological model containing faults constructed by three-dimensional seismic exploration, and then sticking the cut part back to the original place by adopting epoxy resin reinforced plastic glue so as to construct artificial faults. The specific process is as follows: firstly, carrying out mathematical modeling on a cube sample, selecting a certain vertex as a coordinate origin, and enabling any point in the sample to be represented by coordinate points (x, y, z) so as to describe the specific shape of a cut part of the sample; secondly, designing parameters of a cut part of the sample, wherein the parameters comprise coordinates of intersection points of the cut part and the boundary of the sample, phase angles between the cut part and planes formed by the cutting seam and the center of the injection steel pipe, distances between the cut part and the injection steel pipe, included angles between the cut part and a straight line where the injection steel pipe is positioned, sizes and positions of cut surfaces and the like; and finally, re-adhering the cut part to the original place by using epoxy resin bar planting glue, and performing experiments after 14 days of waiting for solidification. Simple overview: and cutting off a part of the processed sample according to the three-dimensional geological model of the coherent basin dry-hot rock field constructed by the method 2-1 in fig. 2, and gluing back the part by using epoxy resin embedded bars to form a simulated fault of the interface after bonding of the method 2-2 in fig. 2. Referring to fig. 3, in the process of manufacturing samples, through manufacturing different samples, the included angle between a fault and a simulated shaft is changed, so that the influence rule of faults with different parameters and attributes on the dry-hot rock hydraulic fracturing induced earthquake can be studied.
And S3, placing the test sample in an indoor hydraulic fracturing test system, applying different temperatures, simulating ground stress and pumping flow, carrying out a hydraulic fracturing test, and adopting acoustic emission to monitor the fracturing process. The temperature is generally consistent with that of a hot dry rock thermal reservoir, and the distribution range is 150-300 ℃; the simulated ground stress cannot be applied according to the actual stress (the sample is damaged by the excessive confining pressure), the simulated ground stress is applied according to the actual stress difference coefficient, the distribution range is 0.2-0.7, and the size is generally 5-40 MPa; the injection flow is determined according to an experimental instrument and is generally 5 mL/min-100 mL/min, the acoustic emission is monitored by 8 channels, and 16 probes are uniformly distributed on the periphery of the sample.
S4, analyzing acoustic emission monitoring data by combining moment tensor inversion, and revealing an influence mechanism of the hydraulic fracturing process on artificial faults. The specific process is as follows: referring to the method of FIG. 4, based on the acquired acoustic emission raw waveform data, the acoustic emission event is precisely positioned, and energy parameters such as event energy level, root mean square amplitude and the like are calculated; further carrying out inversion of a moment tensor of a seismic source mechanism based on the amplitude and the polarity of the P wave to obtain a fracture mechanism (tensor, shearing and compression) of an inversion event and morphological parameters (trend, dip angle, opening and the like) of a fracture surface; and analyzing the influence of different fracturing parameters on the slip quantity of the fault and the release energy.
In this embodiment, when the injected steel pipe is sealed and fixed by the epoxy resin bar planting glue in the step S1, the slit is filled with the water absorbing paper, so as to prevent the epoxy resin bar planting glue from flowing into the injected steel pipe to affect the fracturing experiment. Meanwhile, in the step S1, epoxy resin bar planting glue is firstly injected into the drill hole to a half of the drill hole, and then the injected steel pipe is inserted into the drill hole filled with half of epoxy resin bar planting glue.
In this embodiment, the included angle between the plane shared by the slots and the center line of the injection steel pipe in the step S2 and the "fault" plane is generally 30 ° to 90 °, and the smaller the included angle is, the easier the hydraulic fracture slides along the fault plane. Meanwhile, in the step S2, a part of the sample is cut off, a small amount of epoxy resin bar planting glue is coated on the section, so that the section and the cut-off part are re-adhered, and the fault is simulated by using the cementing surface.
In this embodiment, in the step S3, because the acoustic emission probe is prone to receiving signal misalignment at high temperature, a heat insulation device is required to be disposed between the acoustic emission probe and the sample. Meanwhile, the application of different temperatures in the step S3 depends on the configuration of the hydraulic fracturing test system, wherein part of the hydraulic fracturing test system is used for slowly heating the sample outside the hydraulic fracturing test system and then placing the sample in the hydraulic fracturing test system, and the other part of the hydraulic fracturing test system is used for placing the sample in the hydraulic fracturing test system and then heating the sample to the set temperature.
In this embodiment, although the artificial "fault" is glued by the epoxy resin planted bar in the step S4, the artificial "fault" will also show sliding trend under the action of the hydraulic fracture, even the sliding will occur directly, and these sliding will be fed back by the acoustic emission signal, further using moment tensor inversion will obtain the energy released by the "fault" sliding, the sliding distance (although relatively tiny), and the fracture mode (walk-slip, zhang Jian type, etc.), this method is consistent with the induced earthquake caused by the actual dry thermal rock hydraulic fracture monitoring fault sliding, and developing the indoor experiment using the hydraulic fracture similarity criterion is an effective method for simulating the fracture-induced fault sliding.
The invention has reasonable conception, can obviously improve the efficiency and accuracy of the hydraulic fracturing physical simulation experiment of the hot dry rock, can simulate the fault sliding caused by the hot dry rock fracturing more accurately under the laboratory condition, and is suitable for popularization and application.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (14)
1. A physical simulation experiment method for a dry-hot rock hydraulic fracturing induced earthquake is characterized by comprising the following steps of:
(1) Collecting field granite outcrop, processing the field granite outcrop into a cube sample, and then completing sample processing by matching with a hydraulic fracturing test system;
(2) Cutting off a part of a sample based on a geological model containing faults constructed by three-dimensional seismic exploration, and then sticking the cut part back to the original place by adopting epoxy resin reinforced glue so as to construct artificial faults;
(3) Placing a sample in an indoor hydraulic fracturing test system, applying different temperatures, simulating ground stress and pumping flow, performing a hydraulic fracturing experiment, and monitoring a fracturing process by adopting acoustic emission;
(4) And analyzing acoustic emission monitoring data by combining moment tensor inversion to reveal an influence mechanism of the hydraulic fracturing process on artificial fault.
2. The method for simulating the physical simulation of the dry-hot rock hydraulic fracturing induced earthquake according to claim 1, wherein the specific process of sample processing in the step (1) is as follows: drilling a hole in the sample at the center of one end face of the cube sample, and presetting an injection steel pipe with internal threads at the top end, closed bottom end and slots at the side end in the hole to be used as fracturing fluid to be injected into a simulated shaft; and sealing and fixing the annular gap between the injection steel pipe and the drilling hole by adopting epoxy resin bar planting glue, and performing the next step after the epoxy resin bar planting glue is completely solidified.
3. The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method according to claim 2, wherein: when the injection steel pipe is sealed by the epoxy resin bar planting glue, the slots are filled with water absorbing paper so as to prevent the epoxy resin bar planting glue from flowing into the injection steel pipe to influence the fracturing experiment.
4. The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method according to claim 2, wherein: the epoxy resin bar planting glue is firstly injected into the drill hole to a half position of the drill hole, and then the injected steel pipe is inserted into the drill hole filled with half of the epoxy resin bar planting glue.
5. The dry-hot rock hydraulic fracturing induced earthquake physical simulation experiment method according to claim 2, wherein: the drilling is to drill the inside of the sample to the position of 2/3 of the side length of the sample, and the aperture is 5-6 cm; the width of the slit is 5-6 mm, and the length of the slit is 30-40 mm; and the exposed end face of the sample at the upper part of the injection steel pipe is 1-2 cm.
6. The dry-hot rock hydraulic fracturing induced seismic physical simulation experiment method of claim 1, wherein: the dimensions of the cubic sample in step (1) are at least 300mm by 300mm.
7. The method for simulating the physical simulation of the dry-hot rock hydraulic fracturing induced earthquake according to claim 1, wherein the specific process of the step (2) is as follows: firstly, carrying out mathematical modeling on a cube sample, and selecting a certain vertex as a coordinate origin, so that any point in the sample can be represented by coordinate points (x, y, z); secondly, designing parameters of the cut-out part of the sample; and finally, re-adhering the cut part to the original position by using the epoxy resin bar planting glue, and carrying out experiments when the epoxy resin bar planting glue is completely solidified.
8. The method for simulating the physical earthquake induced by hydraulic fracturing of dry-hot rock according to claim 7, wherein the method comprises the following steps of: the parameters comprise the intersection point coordinates of the cutting part and the boundary of the sample, the phase angle between the cutting part and the plane formed by the cutting seam and the center of the injection steel pipe, the distance between the cutting part and the injection steel pipe, the included angle between the cutting part and the straight line of the injection steel pipe, and the size and the position of the cutting surface;
the included angle between the plane where the slots and the central line of the injection steel pipe are located together and the fault plane is 30-90 degrees.
9. The dry-hot rock hydraulic fracturing induced seismic physical simulation experiment method of claim 1, wherein: and (2) cutting off a part of the sample, brushing a small amount of epoxy resin bar planting glue on the section to re-bond the section and the cut part, and simulating artificial fault by using a cementing surface.
10. The dry-hot rock hydraulic fracturing induced seismic physical simulation experiment method of claim 1, wherein: the temperature in the step (3) is consistent with the temperature of the hot dry rock thermal reservoir, and the distribution range is 150-300 ℃; the simulated ground stress cannot be applied according to the actual stress, the simulated ground stress is applied according to the actual stress difference coefficient, the distribution range is between 0.2 and 0.7, and the size is between 5 and 40 MPa; the injection flow rate is determined to be 5 mL/min-100 mL/min according to an experimental instrument; the acoustic emission is monitored by 8 channels, and 16 acoustic emission probes are uniformly distributed on the periphery of the sample.
11. The dry-hot rock hydraulic fracturing induced seismic physical simulation experiment method of claim 10, wherein: because the acoustic emission probe is easy to receive signals at high temperature and is not aligned, a heat insulation device is needed to be arranged between the acoustic emission probe and the test sample.
12. The dry-hot rock hydraulic fracturing induced seismic physical simulation experiment method of claim 1, wherein: and (3) applying different temperatures according to the configuration of the hydraulic fracturing test system, wherein part of the hydraulic fracturing test system is used for slowly heating the sample outside the hydraulic fracturing test system and then placing the sample in the hydraulic fracturing test system, and the other part of the hydraulic fracturing test system is used for placing the sample in the hydraulic fracturing test system and then heating the sample to the set temperature.
13. The method for simulating the physical simulation of the dry-hot rock hydraulic fracturing induced earthquake according to claim 1, wherein the specific process of the step (4) is as follows: based on the acquired acoustic emission original waveform data, accurately positioning an acoustic emission event and calculating event energy parameters; further carrying out inversion of a moment tensor of a seismic source mechanism based on the amplitude and the polarity of the P wave to obtain a fracture mechanism of an inversion event and morphological parameters of a fracture surface; and analyzing the influence of different fracturing parameters on the slip quantity of the fault and the release energy.
14. The dry-hot rock hydraulic fracturing induced seismic physical simulation experiment method of claim 1, wherein: in the step (4), moment tensor inversion is adopted to obtain the energy released by sliding of a fault, the sliding distance and the fracture mode.
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