CN113390721B - Quantitative evaluation method for tension-torsion fracture structure activity and physical simulation device thereof - Google Patents
Quantitative evaluation method for tension-torsion fracture structure activity and physical simulation device thereof Download PDFInfo
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Abstract
The invention discloses a tectonic physics simulation experiment device, which relates to the technical field of tectonic geology and petrogeology and comprises a power shaft, a scanner, a sand scattering device, a camera, a video camera and a sand box, wherein the power shaft extends into the sand box; the invention also discloses a quantitative evaluation method for the activity of the tension-torsion fracture structure, which comprises the following steps: quantitative analysis of research area tectonic activity, tectonic stress field numerical simulation, tectonic physical simulation experiment, and mutual verification and correction of tectonic stress field numerical simulation and tectonic physical simulation experiment. The method disclosed by the invention combines methods of field actual measurement, structure analysis, stress field numerical simulation, structure physical simulation and the like, realizes quantitative evaluation of the activity of the torsional fracture structure, and has general applicability and operability.
Description
Technical Field
The invention relates to the technical field of tectogeology and petrogeology, in particular to a tension-torsion fracture structure activity quantitative evaluation method and a physical simulation device thereof.
Background
The torsional fracture is different from the common sliding fracture and the stretching fracture, but is a special fracture form formed under the condition of a coupling stress field with the stretching action as the main part and the sliding action as the auxiliary part. As the oil-gas exploration in the east of China enters a high exploration stage, the control effect of some low-order torsional tension fractures on sedimentary reservoirs, trap types, oil-gas migration and accumulation and the like is more and more prominent. The previous research on the comprehensive identification method of the torsional fracture is relatively mature, but the research on the quantitative analysis of the torsional fracture activity, the formation mechanism and the reservoir control effect thereof is still in the starting stage.
The quantitative representation of the sliding displacement of the torsional fracture activity is a relatively weak link in the current research and is one of the difficult problems in the torsional fracture research of the oil-gas-containing basin, and the structural deformation combination pattern of the torsional fracture is determined by exactly matching the size ratio relationship between the torsional fracture sliding displacement and the extension, so that the method has a very important control effect on oil-gas accumulation conditions such as an oil-gas-containing basin ground material source channel, a deposition type, trap effectiveness and the like.
Therefore, the provided effective quantitative evaluation method for the activity of the torsional fracture structure has important significance on the torsional fracture controlled-storage effect.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a quantitative evaluation method for the activity of a torsional fracture structure and a physical simulation device thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a physical simulation experiment device for a structure comprises a power shaft, a scanner, a sand spreading device, a camera, a video camera and a sand box, wherein the power shaft extends into the sand box, the scanner, the sand spreading device and the camera are all positioned above the sand box, and the video camera is positioned in front of the sand box.
Preferably, the power shafts comprise a first power shaft, a second power shaft, a third power shaft and a fourth power shaft, the first power shaft and the second power shaft are located on the left side of the sand box, the third power shaft and the fourth power shaft are located on the rear side and the front side of the sand box, the first power shaft and the second power shaft are sliding stress shafts, and the third power shaft and the fourth power shaft are tension stress shafts.
Preferably, the sand box consists of a steel plate, a baffle plate and a foam plate, wherein the baffle plate is arranged on the steel plate around the periphery, and the foam plate is positioned at the baffle plate.
Preferably, the steel plate is paved with elastic cloth, and the elastic cloth is filled with natural quartz sand.
The invention also discloses a quantitative evaluation method for the activity of the tension-torsion fracture structure, which comprises the following steps:
s1, quantitatively analyzing the structure activity of the research area, carrying out balanced section restoration on the torsion fracture structure section of the research area, determining the structure development evolution stage, determining the structure deformation characteristics of each stage, and calculating the extension amount of each evolution stage of the section;
s2, simulating the structural stress field value, determining the boundary condition of the torsional-tensile fracture zone in the research area, and determining the ancient structural stress field direction through the macroscopic structure and the small structure of the research area; establishing a geological model, synthesizing the logging data calculation of a research area and a rock mechanics experiment to obtain rock mechanics parameters, endowing the rock mechanics parameters to the geological model, converting to obtain a finite element mechanics model, and performing numerical simulation calculation;
s3, using the structural physical simulation experiment device of claim 1 to perform a structural physical simulation experiment;
s4, mutual verification and correction of the structural stress field numerical simulation and the structural physical simulation experiment are carried out, and the magnitude and direction of the tensile stress and the shear stress of each structural evolution stage are determined; and carrying out a plurality of groups of physical simulation experiments by taking the regional and local stress fields as constraints, determining the structural patterns in different evolution stages and under different stress proportioning conditions, accurately measuring the stretching amount and the sliding amount, determining the quantitative relation between the stretching amount and the sliding amount, establishing a mathematical model, and realizing the quantitative evaluation and analysis of the torsional fracture activity.
Preferably, in S1, based on the fine explanation of the quantitative analysis of structural activity, the seismic section perpendicular to the sliding stress direction is cut, and the balanced section recovery is performed on the different types of torsional fracture structural sections in the research area by using the balanced section technology and 2D-3Dmove structural recovery software.
Preferably, the stretch amount derived from walking and sliding is removed when calculating the stretch amount of the cross section in S1.
Preferably, in S2, ANSYS 15.0 finite element analysis software is used to extract and establish a torsional fracture zone geological model, perform numerical simulation calculation, apply a load to the finite element mechanical model according to the boundary condition analysis result, and output a three-dimensional principal stress distribution cloud chart and a vector distribution chart by using ANSYS Structure loading operation in ANSYS 15.0.
Preferably, in S3, two stress axes are arranged in the sliding stress direction, and two stress axes are arranged in the tensile stress direction, so as to simulate the development of the structure under the background of stretching and sliding stress;
the method for determining the tensile stress shaft tensile speed comprises the following steps: the structural deformation formed by discrete twisting has an extension displacement component in the direction perpendicular to the sliding structural belt, and the extension quantity of each evolution stage is determined through balance profile restoration, so that the tension speed of a tension stress shaft is determined;
the method for determining the initial speed of the sliding stress shaft comprises the following steps: based on the numerical simulation result, determining the tensile stress and the shear stress of each evolution stage, wherein the ratio of the tensile stress to the shear stress is consistent with the ratio of the tensile speed to the sliding speed, thereby determining the initial moving speed of the sliding stress shaft
And according to a similarity formula, calculating to obtain a time scaling ratio between the experimental model and the geological prototype, determining the operating time of the tension stress axis and the sliding stress axis, and continuously adjusting the speeds of the tension stress axis and the sliding stress axis according to the experimental result.
Preferably, the mathematical model established in S4 is calculated by subtracting the stretch amount derived from the walking slip.
Compared with the prior art, the invention has the beneficial effects that:
1. in the aspect of constructing a physical simulation experiment, a physical simulation device adopts a first power shaft, a second power shaft, a third power shaft and a fourth power shaft, wherein the sliding stress direction is 2 shafts, the tensile stress direction is 2 shafts, and the structure development under the background of stretching and sliding stress can be simulated; the initial speed of the sliding stress shaft is determined as a key problem, the structural deformation formed by discrete twisting has an extension displacement component in the direction perpendicular to the sliding structural belt, the extension amount of each evolution stage is determined through balance profile restoration, and then the tension speed of the tension stress shaft is determined. And determining tensile stress and shear stress in each evolution stage based on the numerical simulation result, wherein the (tensile stress/shear stress) is consistent with the (tensile speed/sliding speed), so that the initial moving speed of the sliding stress shaft is determined, and then cyclic optimization is carried out.
2. The torsion fracture has two kinds of deformation of 'tension' and 'sliding', so that the sliding translational motion is caused and the stretching displacement component is arranged in the direction vertical to the sliding structural belt; the study on the activity of the torsional fracture structure needs to simultaneously consider two aspects of 'stretching amount' and 'sliding amount', and the stretching amount is easy to calculate by using a balanced section method.
3. According to the method, the combination of structure fine analysis and structure physical simulation results and the combination of stress field numerical simulation and structure physical simulation are utilized, and a mathematical model between the sliding quantity and the stretching quantity under different evolution stages and different stress proportion conditions is established, so that the torsion-tension fracture structure activity calculation method with universal applicability and strong operability is obtained.
The method disclosed by the invention combines methods of field actual measurement, structure analysis, stress field numerical simulation, structure physical simulation and the like, realizes quantitative evaluation of the activity of the torsional fracture structure, and has general applicability and operability.
Drawings
FIG. 1 is a technical route diagram of the quantitative evaluation method for the activity of the torsional fracture structure.
FIG. 2 is a schematic diagram of the tensile fracture elongation of the quantitative evaluation method of the activity of the torsional fracture structure.
FIG. 3 is a model diagram of a physical simulation experiment of the structure in the quantitative evaluation method of the activity of the torsional fracture structure.
In the figure: 1 a first power shaft, 2 a second power shaft, 3 a third power shaft, 4 a fourth power shaft, 5 a scanner, 6 a sanding device, 7 a camera, 8 a steel plate, 9 a baffle plate, 10 a foam plate, 11 a video camera and 12 a sand box.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
It should be noted that EAA ' in fig. 2 is the extension of the seismic section, E σ is the extension of the tensile stress, EBB ' is the extension of the derivative fracture, PDZ is the main deformation zone, and AA ' is a section perpendicular to the main fracture zone.
Referring to fig. 1-3, a physical simulation experiment device of a structure comprises a power shaft, a scanner 5, a sanding device 6, a camera 7, a camera 11 and a sand box 12, wherein the power shaft extends into the sand box 12, the scanner 5, the sanding device 6 and the camera 7 are all positioned above the sand box 12, and the camera 11 is positioned in front of the sand box 12.
The sand box comprises a sand box body, wherein the sand box body is provided with a sand box body, the sand box body is provided with a sand box body 12, the sand box body is provided with a sand box body, the sand box body is arranged in a sand box body, the sand box body is provided with a sand box body, the sand box body is provided with sand box body, the sand box body and the sand box body, the sand box body, the sand box and the sand box, the sand box.
Wherein, sand box 12 constitutes specifically: the sand box 12 is composed of a steel plate 8, a baffle plate 9 and a foam plate 10, wherein the baffle plate 9 is arranged on the steel plate 8 around the periphery, the foam plate 10 is positioned inside the baffle plate 9, elastic cloth is laid on the steel plate 8, and natural quartz sand is filled in the elastic cloth.
It should be explained that an experimental platform, a control system and an information acquisition and processing system need to be constructed before the physical simulation is constructed.
The material of the experimental platform: the frame is an aluminum profile;
the table top is the size of the physicochemical plate: length × width × height =2.5m × 2.8m × 0.8 m;
the functions are as follows: the experimental sand box 12 is supported, the experimental platform is made of aluminum section, is provided with universal wheels and brakes, can move freely and brake at any time, and is attractive in whole and convenient to move and operate;
the specific dimensions of the sand box 12 are:
maximum size: length × width × height =1.5m × 0.8m × 0.3 m;
the material is as follows: a baffle 9 and a steel plate 8;
mainly comprises a front baffle plate 9, a rear baffle plate 9, a left baffle plate 9, a right baffle plate 9, a bottom plate steel plate 8, an electric cylinder and the like. The front and rear baffles 9 are made of toughened glass, are transparent and wear-resistant and are easy to observe the section of the sand layer; the sliding device is connected with the bottom plate steel plate 8 into a whole and can move along with the bottom plate steel plate 8 to form sliding motion; the left baffle plate 9 and the right baffle plate 9 are made of aluminum alloy, the outer sides of the left baffle plate and the right baffle plate are directly connected with the electric cylinder, the inner sides of the left baffle plate and the right baffle plate are connected with rubber, the rubber enters the lower part of the bottom plate steel plate 8 through two bottom plate gaps, weights are hung on the rubber, the rubber is tensioned, and the motions of tension, extrusion and the like can be realized;
the bottom plate steel plate 8 is made of aluminum alloy, and a linear guide rail is arranged on the lower surface of the bottom plate steel plate, so that sliding movement is facilitated. When the angle-variable walking and sliding are needed, the sliding rail bracket can be obliquely installed to realize shearing movement; the baffle plates 9 with different lengths can be selected according to the experimental requirements, and the size of the sand box 12 consisting of the front baffle plate 9, the rear baffle plate 9, the left baffle plate 9 and the right baffle plate 9 can be adjusted; the electric cylinder provides driving force for the operation of the geological structure, and the electric cylinder connected with the front baffle plate and the rear baffle plate 9 is arranged on the guide rail bracket and is perpendicular to the push plate forever; the electric cylinder connected with the left and right push plates is arranged on the bottom plate steel plate 8, so that the running function of the baffle plate 9 is easy to realize; the operation speed is adjustable, the displacement can be measured (the speed and the displacement of the push rod are measured and calculated by a signal fed back by a motor coding disc), the operation is convenient, and the motion is flexible;
the stroke of each of 4 power shafts arranged in the electric cylinder, namely the first power shaft 1, the second power shaft 2, the third power shaft 3 and the fourth power shaft 4 is 20cm, the movement speed is 0.01-0.5 mm/s, the repeated positioning precision is 0.01mm, and the maximum thrust is 3000 kg; the electric cylinder connected with the front baffle plate and the rear baffle plate 9 is arranged on the guide rail bracket and is perpendicular to the baffle plates 9 forever; the electric cylinder connected with the left baffle plate and the right baffle plate 9 is arranged on the bottom plate steel plate 8, so that the running function of the baffle plates 9 is easy to realize, the running speed is adjustable, and the displacement can be measured.
The control system comprises: various parameters of the experiment can be controlled, such as the stretching displacement is 0-20 cm; the extrusion displacement is 0-15 cm; the sliding displacement is 0-20 cm; the movement speed is 0.01-0.5 mm/s; the control system has the characteristics that: 1. the dynamic loading system adopts a servo control mode, the performance is excellent under low-speed large thrust (the lowest speed is 0.01mm/s and is more than or equal to 100kg), and a dynamic thrust coupling system with multiple thrust cylinders brings incomparable technical advantages for accurate stress field simulation;
2. all push rods can be independently controlled and are in multi-thread communication with an upper computer, so that the mutual instruction interference cannot be generated when the motors work simultaneously;
the movement speeds, the movement times and the movement modes (forward or backward) of the 4 power shafts are controlled by an industrial personal computer, the adopted industrial personal computer is a Siemens IPC3000 series, a 19-inch standard 4U rack type design is adopted, and an Intel Pentium Dual Core G2010 processor is configured, so that the CPU can be ensured to run at full speed for 24 hours under the industrial condition that the environmental temperature is up to 40 ℃. Two serial ports COM1 and COM2 are configured, wherein COM2 can support three modes (selected through BIOS menus) of RS232/RS485/RS422, and two video output interfaces DVI-D and VGA can output simultaneously.
The information acquisition and processing system comprises: the system comprises a 3D optical scanning system, acquisition software and acquisition and control software;
more specifically, the pixels of the 3D optical scanning system and the acquisition software need to reach 300 million pixels, the surface morphology of the model can be scanned and recorded, a visual surface three-dimensional graph is given, the digitization of experimental data is facilitated, the deformation angle, the displacement distance, the size, the volume and the like of the scanned model can be measured through CAD software, and the quantitative data collection of the sand body surface deformation is realized;
acquisition and control software: collects and controls the speed and the displacement of the electric cylinder,
firstly, collecting real-time load and drawing a load time curve;
secondly, the running speed and the running distance can be set, and the platform push rod is remotely controlled to perform corresponding actions;
the running track of the push plate can be previewed in a 3D mode;
and fourthly, the three-dimensional acquisition system can restore the three-dimensional form of the surface of the model.
The experimental device adopts natural quartz sand to simulate the brittle coulomb behavior of the earth crust, and based on structural evolution, the number of earlier developed faults and the plane spread characteristics are defined, and the earlier faults are arranged on the elastic cloth; the device is provided with a power shaft, wherein the sliding stress direction is two shafts, and the tensile stress direction is two shafts; when the device is used, a strain circle or a square is imprinted on the surface of the natural quartz sand; in operation, the video camera 11 is used for recording the section deformation process of the sand body, and the camera 7 and the scanner 5 are used for recording the plane deformation process of the sand body; after the sand body is finished, the sprinkling can is used for sprinkling water to the sand body till the sand body is thoroughly wetted, the cutter is used for slicing the sand body at equal intervals, and the camera is used for shooting the internal deformation characteristics of the sand body.
The invention also discloses a quantitative evaluation method for the activity of the tension-torsion fracture structure, which comprises the following steps:
s1, quantitatively analyzing the structure activity of the research area, carrying out balanced section restoration on the torsion fracture structure section of the research area, determining the structure development evolution stage, determining the structure deformation characteristics of each stage, and calculating the extension amount of each evolution stage of the section;
s2, simulating the structural stress field value, determining the boundary condition of the torsional-tensile fracture zone in the research area, and determining the ancient structural stress field direction through the macroscopic structure and the small structure of the research area; establishing a geological model, synthesizing the logging data calculation of a research area and a rock mechanics experiment to obtain rock mechanics parameters, endowing the rock mechanics parameters to the geological model, converting to obtain a finite element mechanics model, and performing numerical simulation calculation;
s3, performing a physical simulation experiment using the physical simulation experimental apparatus of claim 1;
s4, mutual verification and correction of the structural stress field numerical simulation and the structural physical simulation experiment are carried out, and the magnitude and direction of the tensile stress and the shear stress of each structural evolution stage are determined; and carrying out a plurality of groups of physical simulation experiments by taking the regional and local stress fields as constraints, determining the structural patterns in different evolution stages and under different stress proportioning conditions, accurately measuring the stretching amount and the sliding amount, determining the quantitative relation between the stretching amount and the sliding amount, establishing a mathematical model, and realizing the quantitative evaluation and analysis of the torsional fracture activity.
The method comprises the steps of S1, intercepting a seismic section perpendicular to the walking-sliding stress direction on the basis of structure activity quantitative analysis fine interpretation, performing balanced section recovery on different types of torsion fracture structure sections in a research area by using a balanced section technology and 2D-3Dmove structure recovery software, and removing the extension amount generated by walking-sliding derivation when calculating the section extension amount in S1.
The method comprises the following steps of S2, extracting and establishing a torsional fracture zone geological model by adopting ANSYS 15.0 finite element analysis software, carrying out numerical simulation calculation, applying a load to a finite element mechanical model according to a boundary condition analysis result, and outputting a three-dimensional main stress distribution cloud chart and a vector distribution chart by utilizing ANSYS Structure loading operation in ANSYS 15.0.
In the step S3, the structure development under the background of stretching and sliding stress is simulated by arranging two stress shafts in the sliding stress direction and arranging two stress shafts in the tensile stress direction;
the method for determining the tensile stress shaft tensile speed comprises the following steps: the structural deformation formed by discrete twisting has an extension displacement component in the direction perpendicular to the sliding structural belt, and the extension quantity of each evolution stage is determined through balance profile restoration, so that the tension speed of a tension stress shaft is determined;
the method for determining the initial speed of the sliding stress shaft comprises the following steps: determining tensile stress and shear stress of each evolution stage based on a numerical simulation result, wherein the ratio of the tensile stress to the shear stress is consistent with the ratio of the tensile speed to the sliding speed, so that the initial moving speed of the sliding stress shaft is determined;
according to a similarity formula, calculating to obtain a time scaling ratio between the experimental model and the geological prototype, determining the operation time of a tension stress axis and a sliding stress axis, and continuously adjusting the speeds of the tension stress axis and the sliding stress axis according to the experimental result;
in the calculation of the mathematical model established in S4, the stretch amount derived from the walking slip needs to be subtracted.
The specific steps for constructing the physical simulation experiment in the S3 are as follows:
firstly, performing experimental modeling, namely determining the area range, boundary conditions and stratum thickness of the fracture according to the comprehensively identified typical torsional fracture, and establishing a geological model; then, converting the geological model into an experimental model according to a similarity principle; in the geometric similarity, the geometric shape, the dimension and the lithological configuration of the experimental model are reduced in equal proportion according to the geological model; in the similarity of material mechanics, natural quartz sand is selected to simulate the brittle coulomb behavior of the earth crust; the boundary is shielded by a foam plate 10, in order to realize the stress transmission, the bottom of the model steel plate 8 is coated with a layer of elastic cloth, and the periphery of the elastic cloth is connected with a movable baffle plate 9; based on structural evolution, the number of earlier developed faults and the plane spread characteristics are defined, and the earlier faults are arranged on the elastic cloth;
secondly, parameter calculation, wherein 4 power shafts are adopted in the research, the sliding stress direction is 2 shafts, the tensile stress direction is 2 shafts (as shown in figure 3), the structural development under the background of stretching and sliding stress can be simulated, and the method is another possible innovation in the research; calculating to obtain the time scaling ratio between the experimental model and the geological prototype according to a similarity formula, and determining the operation time of each stress axis; wherein, the speed of the sliding stress shaft is continuously adjusted according to the experimental result; determining the initial speed of the sliding stress shaft as a key problem, determining the extension displacement component of the structural deformation formed by discrete twisting in the direction perpendicular to the sliding structural belt, determining the extension quantity of each evolution stage through balance profile restoration, and further determining the tension speed of the tension stress shaft; determining tensile stress and shear stress in each evolution stage based on a numerical simulation result, wherein the (tensile stress/shear stress) is consistent with the (tensile speed/sliding speed), so that the initial moving speed of a sliding stress shaft is determined, and then carrying out cyclic optimization;
thirdly, simulating an experiment, namely paving materials required by an experiment model on an experiment platform, and imprinting a strain circle or square on the surface; in operation, the video camera 11 is used for recording the section deformation process of the sand body, and the camera 7 and the scanner 5 are used for recording the plane deformation process of the sand body; after the sand body is completely wetted, sprinkling water to the sand body by using a sprinkling can, slicing the sand body at equal intervals by using a cutter, and shooting the internal deformation characteristics of the sand body by using a camera; and (5) carrying out repeated experiments and optimizing in a circulating way.
According to the method, the combination of structure fine analysis and structure physical simulation results and the combination of stress field numerical simulation and structure physical simulation are utilized, and a mathematical model between the sliding quantity and the stretching quantity under different evolution stages and different stress proportion conditions is established, so that the torsion fracture structure activity calculation method with general applicability and strong operability is obtained.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A physical simulation experiment device of a structure comprises a power shaft, a scanner (5), a sand scattering device (6), a camera (7), a video camera (11) and a sand box (12), and is characterized in that the power shaft extends into the sand box (12), the scanner (5), the sand scattering device (6) and the camera (7) are all positioned above the sand box (12), the video camera (11) is positioned in front of the sand box (12), the power shaft comprises a first power shaft (1), a second power shaft (2), a third power shaft (3) and a fourth power shaft (4), the first power shaft (1) and the second power shaft (2) are positioned on the left side of the sand box (12), the third power shaft (3) and the fourth power shaft (4) are positioned on the rear side and the front side of the sand box (12), and the first power shaft (1) and the second power shaft (2) are sliding stress shafts, the third power shaft (3) and the fourth power shaft (4) are tensile stress shafts.
2. A constructed physical simulation test device according to claim 1, wherein the sand box (12) is composed of a steel plate (8), a baffle plate (9), and a foam board (10), the baffle plate (9) is arranged around the steel plate (8), and the foam board (10) is arranged at the baffle plate (9).
3. A structural physical simulation experiment device according to claim 2, wherein the steel plate (8) is laid with an elastic cloth, and the elastic cloth is filled with natural quartz sand.
4. A quantitative evaluation method for the activity of a tension-torsion fracture structure is characterized by comprising the following steps:
s1, quantitatively analyzing the structure activity of the research area, carrying out balanced section restoration on the torsion fracture structure section of the research area, determining the structure development evolution stage, determining the structure deformation characteristics of each stage, and calculating the extension amount of each evolution stage of the section;
s2, simulating the structural stress field value, determining the boundary condition of the torsional-tensile fracture zone in the research area, and determining the ancient structural stress field direction through the macroscopic structure and the small structure of the research area; establishing a geological model, synthesizing the logging data calculation of a research area and a rock mechanics experiment to obtain rock mechanics parameters, endowing the rock mechanics parameters to the geological model, converting to obtain a finite element mechanics model, and performing numerical simulation calculation;
s3, using the structural physical simulation experiment device of claim 1 to perform a structural physical simulation experiment;
s4, mutual verification and correction of the structural stress field numerical simulation and the structural physical simulation experiment are carried out, and the magnitude and direction of the tensile stress and the shear stress of each structural evolution stage are determined; and carrying out a plurality of groups of physical simulation experiments by taking the regional and local stress fields as constraints, determining the structural patterns in different evolution stages and under different stress proportioning conditions, accurately measuring the stretching amount and the sliding amount, determining the quantitative relation between the stretching amount and the sliding amount, establishing a mathematical model, and realizing the quantitative evaluation and analysis of the torsional fracture activity.
5. The quantitative evaluation method for the structure activity of the torsional fracture as claimed in claim 4, wherein in the step S1, on the basis of the fine analysis and interpretation of the structure activity, the seismic section perpendicular to the sliding stress direction is cut, and the balanced section recovery is performed on different types of torsional fracture structure sections in the research area by using a balanced section technology and 2D-3Dmove structure recovery software.
6. A quantitative evaluation method for tensile-torsional fracture structure activity according to claim 4, wherein the stretch amount generated by the slip derivation is removed when the section stretch amount is calculated in S1.
7. The quantitative evaluation method for the activity of the tension fracture Structure as claimed in claim 4, wherein in the step S2, ANSYS 15.0 finite element analysis software is adopted, a geological model of the tension fracture zone is extracted and established, numerical simulation calculation is carried out, a load is applied to the finite element mechanical model according to the analysis result of the boundary condition, and an ANSYS Structure loading operation in the ANSYS 15.0 is utilized to output a three-way main stress distribution cloud map and a vector distribution map.
8. The quantitative evaluation method for the activity of the tension-torsion-fracture structure according to claim 4, wherein in the step S3, the structure development under the background of the stretching and sliding stress is simulated by arranging two stress axes in the sliding stress direction and arranging two stress axes in the tension stress direction;
the method for determining the tensile stress shaft tensile speed comprises the following steps: the structural deformation formed by discrete twisting has an extension displacement component in the direction perpendicular to the sliding structural belt, and the extension quantity of each evolution stage is determined through balance profile restoration, so that the tension speed of a tension stress shaft is determined;
the method for determining the initial speed of the sliding stress shaft comprises the following steps: determining tensile stress and shear stress of each evolution stage based on a numerical simulation result, wherein the ratio of the tensile stress to the shear stress is consistent with the ratio of the tensile speed to the sliding speed, so that the initial moving speed of the sliding stress shaft is determined;
and according to a similarity formula, calculating to obtain a time scaling ratio between the experimental model and the geological prototype, determining the operating time of the tension stress axis and the sliding stress axis, and continuously adjusting the speeds of the tension stress axis and the sliding stress axis according to the experimental result.
9. The method according to claim 4, wherein the mathematical model established in S4 is calculated by subtracting the stretching amount derived from slip.
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