An experimental device and method for simulating the genesis mechanism of the Anyue rift trough in Deyang

Abstract

The present application relates to the technical field of geology physical simulation, and provides an experimental device and method for simulating the formation mechanism of the Deyang Anyue rift trough, the experimental device for simulating the formation mechanism of the Deyang Anyue rift trough comprising an experimental platform, a baffle assembly, a bearing, a lifting mechanism, a linear transmission mechanism and a controller, the first driving device being controlled by the controller to synchronously drive the first baffle and drive the two hard plastic plates connected to the two sides of the extensible plate to move reversely, so as to pull the extensible plate to make horizontal extension movement, simulating the tension process of the stratum; the bearing driving the extensible plate and the overlying quartz sand uplift by driving the lifting mechanism, simulating the stratum uplift caused by the uplift of the mantle plume, simulating the 'activation' effect of the pre-existing basement fracture by using the hard plastic plate, and then based on the development form of the Deyang Anyue rift trough, the distribution of the overlying stratum and the characteristics of the fracture system, using the first lateral extension and then longitudinal strike-slip mode, the formation of the Deyang Anyue rift trough is more scientifically and intuitively simulated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of geology physical simulation technology, and particularly relates to an experimental device and method for simulating the formation mechanism of a Deyang Anyue rifted trough. BACKGROUND

[0002] Structural physical simulation experiment is an important research method in geology, which simulates the formation and evolution process of real geological phenomena by building a physical model in the laboratory.

[0003] The existence of the Deyang-Anyue "trough basin" has been generally accepted, but there are still many differences in the formation mechanism and evolution process of the "trough basin" from the current research. Through the comparison and interpretation of the latest fine three-dimensional seismic data and drilling data of the outcrop profile in the Sichuan Basin, it is considered that the formation of the Deyang-Anyue rifted trough is controlled by extension, and has experienced a large-scale uplift and denudation process, and the "activation" of the basement fault also has an important influence on the formation of the trough basin.

[0004] Based on the analysis of field, drilling and seismic data, the formation and evolution process of the Deyang-Anyue erosion rifted trough in the Sichuan Basin is restored, and the exploration field is divided and evaluated, which has an important control effect on the formation and distribution of the Sinian-Cambrian super large natural gas reservoir. SUMMARY

[0005] The present application provides an experimental device and method for simulating the formation mechanism of a Deyang-Anyue rifted trough, which can more scientifically and intuitively simulate the formation of the Deyang-Anyue rifted trough.

[0006] The present application provides an experimental device for simulating the formation mechanism of a Deyang-Anyue rifted trough, comprising:

[0007] An experimental platform is provided with a through hole;

[0008] A baffle assembly is arranged on the experimental platform and comprises a pair of first baffles and a pair of second baffles, and the pair of first baffles and the pair of second baffles can form a containing cavity with a rectangular cross section;

[0009] A bearing member is arranged at the bottom of the containing cavity and is used for bearing a matrix of a simulated rock stratum model, the bearing member comprises an extensible plate, a first hard plastic plate and a second hard plastic plate, the first hard plastic plate and the second hard plastic plate are respectively connected to the two sides of the upper surface of the extensible plate, one side of the first hard plastic plate and the second hard plastic plate can be respectively detachably connected to the corresponding first baffle, and the middle part of the extensible plate corresponds to the through hole;

[0010] A lifting mechanism is arranged at the bottom of the experimental platform, and the driving end of the lifting mechanism is provided with a supporting member which can act on the extensible plate through the through hole;

[0011] A linear transmission mechanism is arranged on the experimental platform, and the linear transmission mechanism comprises a pair of first driving devices, and the pair of first driving devices respectively act on a pair of the first baffle plates and are used for synchronously driving the pair of first baffle plates to move away from each other in a first direction, so as to pull the extensible plate to make a horizontal stretching movement.

[0012] A controller is electrically connected with the lifting mechanism and the first driving device.

[0013] According to the experimental device for simulating the genesis mechanism of the Dayang Anyue rift trough provided by the application, the end of the first hard plastic plate is detachably connected with one of the second baffle plates, and the end of the second hard plastic plate is detachably connected with the other second baffle plate.

[0014] According to the experimental device for simulating the genesis mechanism of the Dayang Anyue rift trough provided by the application, the linear transmission mechanism further comprises a pair of second driving devices, the second driving devices are electrically connected with the controller, and the pair of second driving devices respectively act on a pair of the second baffle plates and are used for synchronously driving the pair of second baffle plates to move away from each other in a second direction, so as to respectively drive the first hard plastic plate and the second hard plastic plate to move in a reverse parallel manner.

[0015] According to the experimental device for simulating the genesis mechanism of the Dayang Anyue rift trough provided by the application, the upper surface of the supporting piece is in a circular arc shape.

[0016] According to the experimental device for simulating the genesis mechanism of the Dayang Anyue rift trough provided by the application, the experimental device further comprises a first stop block and a second stop block, the first stop block is used for pressing the first hard plastic plate on the experimental platform, and the second stop block is used for pressing the second hard plastic plate on the experimental platform.

[0017] According to the experimental device for simulating the genesis mechanism of the Dayang Anyue rift trough provided by the application, the first hard plastic plate is detachably connected with the first baffle plate through a first connecting structure, and the first connecting structure comprises:

[0018] A first adapter plate is provided with a plurality of first through holes;

[0019] A first connecting hole, the first fixing hole and the first through hole are the same in number and one-to-one correspondence, and a plurality of first connecting holes are uniformly distributed on the first baffle plate in a second direction;

[0020] A first fixing hole, the first fixing hole and the first connecting hole are the same in number and one-to-one correspondence, and the first fixing hole is uniformly distributed on the first hard plastic plate in a second direction;

[0021] A fastener sequentially passes through the first fixed hole, the first through hole and the first connecting hole, and connects the first hard plastic plate, the first adapter plate and the first baffle.

[0022] The experimental device for simulating the formation mechanism of the Dayang Anyue rift trough provided by the application comprises a first hard plastic plate, a first adapter plate, a first baffle, a second hard plastic plate, a second adapter plate, a second baffle, a first driving device and a second driving device.

[0023] The second adapter plate is provided with a plurality of second through holes.

[0024] The second fixed hole and the second through hole are in one-to-one correspondence, and a plurality of second connecting holes are uniformly distributed on the second baffle along the first direction.

[0025] The second fixed hole and the second connecting hole are in one-to-one correspondence, and the second fixed hole is uniformly distributed on the second hard plastic plate along the first direction.

[0026] A fastener sequentially passes through the second fixed hole, the second through hole and the second connecting hole, and connects the second hard plastic plate, the second adapter plate and the second baffle.

[0027] The first driving device and the second driving device are electric push rods, and the driving motor in the electric push rod is a stepping motor.

[0028] The application further provides a method for simulating the formation mechanism of the Dayang Anyue rift trough, which is applied to the experimental device for simulating the formation mechanism of the Dayang Anyue rift trough and comprises the following steps of:

[0029] Setting experimental parameters;

[0030] A plurality of layers of matrixes are laid on the upper surfaces of the ductile plate, the first hard plastic plate and the second hard plastic plate in the accommodating cavity, and different color mark layers are laid on the top surfaces of the layers, respectively.

[0031] The lifting mechanism drives the supporting member to ascend at a constant speed and pass through the through hole of the experimental platform to contact the ductile plate, drives the ductile plate and the overlying quartz sand to rise, and stops after rising to a certain degree.

[0032] The sand body at the high position of the rise is scraped off to simulate the denudation movement, and the model is divided into regions according to the denudation degree.

[0033] The lifting mechanism drives the supporting member to descend below the experimental platform, and simultaneously, a pair of first driving devices synchronously pull the ductile plate in the first direction to make horizontal extension movement, and the extension is stopped when the ductile plate has obvious sand body rift phenomenon, and an image of the horizontal extension feature is obtained.

[0034] The experimental device for simulating the formation mechanism of the Dayang Anyue rift trough according to the present application further comprises:

[0035] The multiple layers of quartz sand are continuously laid, wherein the first layer of the continuously laid quartz sand fills the previous sand body, and the subsequent multiple layers of quartz sand are laid layer by layer;

[0036] The two hard plastic plates are connected to the pair of second baffles respectively, and the connection between the two hard plastic plates and the first baffle is released, the first hard plastic plate and the second hard plastic plate are relatively and parallelly dislocated by the second driving device, and the relative movement between the internal regions of all the overlying quartz sand layers is driven, so as to form a strike-slip structure and obtain the image of the top surface of the sand body.

[0037] The experimental device for simulating the formation mechanism of the Dayang Anyue rift trough according to the present application has simple structure and is easy to operate, is based on the exploration of the formation mechanism of the Dayang Anyue rift trough and the analysis of actual three-dimensional seismic data, and constructs a physical simulation experiment model, the present application comprehensively considers the influencing factors, can simultaneously simulate the influences of the stratum uplift, denudation process, extension process and the "activation" process of the pre-existing basement fracture on the formation of the rift trough, the simulation results can more scientifically and intuitively deduce the formation and evolution process of the rift trough, the controller is used to control the first driving device to synchronously drive the first baffle and drive the two hard plastic plates connected to the two sides of the extensible plate to move reversely, so as to pull the extensible plate to make horizontal extension movement, the extension process of the stratum is simulated, the lifting mechanism is used to drive the support to drive the extensible plate and the overlying quartz sand to uplift, the stratum uplift caused by the uplift of the mantle column is simulated, the hard plastic plate is used to simulate the "activation" effect of the pre-existing basement fracture, and based on the development form of the Dayang Anyue rift trough, the distribution of the overlying stratum and the characteristics of the fracture system, a horizontal extension first and then vertical strike-slip mode is adopted, so that the formation of the Dayang Anyue rift trough is more scientifically and intuitively simulated. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0039] Figure 1 It is a structural schematic view of an experimental device for simulating the formation mechanism of the Dayang Anyue rift trough provided by the embodiments of the present application.

[0040] Figure 2is a top view of an experimental device for simulating the formation mechanism of the Dayang Anyue rift trough provided by the embodiment of the present application.

[0041] Figure 3 is a plane evolution diagram of the model simulation result provided by the embodiment of the present application.

[0042] Figure 4 is a profile slice diagram of the model simulation result provided by the embodiment of the present application.

[0043] Reference signs:

[0044] 1, experimental platform; 11, through hole; 12, first stop block; 13, second stop block; 2, first baffle; 3, second baffle; 4, ductile plate; 5, first hard plastic plate; 6, second hard plastic plate; 7, lifting mechanism; 71, supporting piece; 8, first driving device; 9, second driving device; 10, controller. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described below in conjunction with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0046] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0047] The embodiments of the present application will be described below in conjunction with Figures 1-4 An experimental device and method for simulating the formation mechanism of the Dayang Anyue rift trough are described.

[0048] The present embodiment provides an experimental device for simulating the formation mechanism of the Dayang Anyue rift trough, as shown in Figures 1-2 The experimental device comprises an experimental platform 1, a baffle assembly, a bearing piece, a lifting mechanism 7, a linear transmission mechanism and a controller 10.

[0049] The experimental platform 1 is provided with a through hole 11, and the bottom is supported by a support body at a certain height from the ground, and is used to set a lifting mechanism 7 at the bottom. The experimental platform 1 has a rectangular structure, and the first direction is the length direction of the experimental platform 1, and the second direction is the width direction of the experimental platform 1, as shown in Figure 2 The left-right direction is the first direction, that is, the length direction of the experimental platform 1, and the up-down direction is the second direction, that is, the width direction of the experimental platform 1.

[0050] The baffle assembly is arranged on the experimental platform 1 and includes a pair of first baffles 2 and a pair of second baffles 3. Each baffle is in a separated state, and the pair of first baffles 2 and the pair of second baffles 3 can surround a receiving cavity with a rectangular cross section to accommodate a matrix of a simulated rock stratum model, such as quartz sand.

[0051] The bearing member is arranged at the bottom of the receiving cavity and is used to bear the matrix of the simulated rock stratum model. The bearing member includes an extensible plate 4, a first hard plastic plate 5, and a second hard plastic plate 6. The first hard plastic plate 5 and the second hard plastic plate 6 are respectively connected to the upper surfaces of the two sides of the extensible plate 4. The area where the first hard plastic plate 5 and the second hard plastic plate 6 are located is a stable area, and the matrix will not be deformed due to the movement of the hard plastic plate. The extensible plate 4 can be made of a rubber plate and used as a homogeneous medium to ensure that the stretching force is uniformly transmitted in the model. The extensible plate 4 is used to transmit the stretching force generated by the deformation of the extensible plate 4 to the model formed by the matrix. One side of the first hard plastic plate 5 and the second hard plastic plate 6 can be respectively detachably connected to the corresponding first baffle 2. The middle part of the extensible plate 4 corresponds to the through hole 11.

[0052] The lifting mechanism 7 is arranged at the bottom of the experimental platform 1. The driving end of the lifting mechanism 7 is provided with a supporting member 71. The lifting mechanism 7 can drive the supporting member 71 to pass through the through hole 11 and act on the extensible plate 4 to raise the extensible plate 4 and the overlying matrix. The lifting mechanism 7 mainly realizes the lifting movement in the vertical direction and can be in the form of a scissors lifting mechanism, a screw nut lifting mechanism, a pneumatic lifting mechanism, or a hydraulic oil cylinder lifting mechanism.

[0053] The linear transmission mechanism is arranged on the experimental platform 1 and includes a pair of first driving devices 8. The pair of first driving devices 8 respectively act on the pair of first baffles 2 to synchronously drive the pair of first baffles 2 to move away from each other in the first direction, so as to pull the extensible plate 4 to make a horizontal stretching movement and drive the matrix laid thereon to stretch. When the obvious middle sand body collapse phenomenon appears, the stretching is stopped.

[0054] The controller 10 is electrically connected with the lifting mechanism 7 and the first driving device 8, used for controlling the start and stop of the lifting mechanism 7 to drive the supporting member 71 to act on the extensible plate 4, and used for controlling the synchronous operation of the pair of first driving devices 8 to drive the pair of first baffles 2 to move away from each other and drive the extensible plate 4 to make horizontal extension movement through the first hard plastic plate 5 and the second hard plastic plate 6.

[0055] In some embodiments, the lifting mechanism 7 is independently controlled by an independent control system.

[0056] As preferred, in the embodiment, the pair of first driving devices 8 are respectively arranged at the outer sides of the first baffles 2, and the wires of the pair of first driving devices 8 are parallel to the first direction, that is, the two first driving devices 8 are arranged in a straight line, so that the driving of the first baffles 2 and the driving of the extensible plate 4 to make extension deformation are not affected by the nonlinear displacement of the non-coaxial stress, which is beneficial to improve the accuracy of the experimental results.

[0057] In some embodiments, the two hard plastic plates are pasted on the extensible plate 4 by strong glue, so as to prevent the substrate from deforming on the hard plastic plate, concentrate the simulation deformation on the extensible plate 4, and eliminate the system error caused by the mutual movement between the hard plastic plate and the extensible plate 4 in the extension deformation of the extensible plate 4.

[0058] In some embodiments, the upper surface of the supporting member 71 is a circular arc, for example, the supporting member 71 is a semi-cylindrical foam body, and the outer circular arc surface corresponds to the extensible plate 4, so that the stress of the supporting member 71 is uniformly distributed, the stress concentration is reduced when the supporting member 71 rises and contacts the extensible plate 4, the simulation effect of the experiment is improved, and the accuracy of the experimental results is improved.

[0059] The end of the first hard plastic plate 5 is detachably connected with one of the second baffles 3, and the end of the second hard plastic plate 6 is detachably connected with the other second baffle 3, that is, the ends of the first hard plastic plate 5 and the second hard plastic plate 6 on different sides are respectively detachably connected with the second baffles 3 close to the ends.

[0060] Further, the straight line transmission mechanism further comprises a pair of second driving devices 9, the second driving devices 9 are electrically connected with the controller 10, and the pair of second driving devices 9 respectively act on the pair of second baffles 3, used for driving the pair of second baffles 3 to move away from each other along the second direction to drive the first hard plastic plate 5 and the second hard plastic plate 6 to move in opposite directions in parallel.

[0061] In this way, the second driving devices 9 drive the pair of second baffles 3 to move in opposite directions in synchronization, and drive the first hard plastic plate 5 and the second hard plastic plate 6 to move in opposite directions in parallel, and drive the substrate laid thereon to form a strike-slip fracture feature.

[0062] It should be noted that, in the stretching process of the extensible plate 4, the pair of first driving devices 8 respectively act on the pair of first baffle plates 2 to synchronously drive the two hard plastic plates to move away from each other in the first direction, thereby simulating the activation of the pre-existing substrate fracture, and therefore the first hard plastic plate 5 and the second hard plastic plate 6 cannot be connected together with the second baffle plates 3 at both ends; in the strike-slip process, the second driving device 9 drives the pair of hard plastic plates to move in the second direction, and therefore the first hard plastic plate 5 and the second hard plastic plate 6 cannot be fixed with the first baffle plates 2.

[0063] Optionally, the first driving device 8 and the second driving device 9 are both electric push rods, and the driving motor in the electric push rod is a stepping motor, and the travel speed of the first baffle plate 2 or the second baffle plate 3 is 0.15 cm / min.

[0064] In some embodiments, first stop block 12 and second stop block 13 are further included, the first stop block 12 is used to press the first hard plastic plate 5 tightly on the experimental platform 1, and the second stop block 13 is used to press the second hard plastic plate 6 tightly on the experimental platform 1.

[0065] In this way, when the lifting mechanism 7 is used to control the half-cylindrical foam body to rise at a constant speed to make the extensible plate 4 and the overlying quartz sand rise, the first stop block 12 and the second stop block 13 can be used to press the two hard plastic plates from the side respectively, so as to ensure that the hard plastic plates will not be lifted from the extensible plate 4 during the rising process.

[0066] In this embodiment, the first hard plastic plate 5 is detachably connected with the first baffle plate 2 through a first connecting structure, and the first connecting structure includes a first adapter plate, a first connecting hole, a first fixing hole and a fastener.

[0067] The first adapter plate is provided with a plurality of first through holes, the number of the first fixing holes is the same as that of the first through holes and they are one-to-one corresponding, and the plurality of first connecting holes are uniformly distributed on the first baffle plate 2 in the second direction; the number of the first fixing holes is the same as that of the first connecting holes and they are one-to-one corresponding, and the first fixing holes are uniformly distributed on the first hard plastic plate 5 in the second direction; the fastener passes through the first fixing hole, the first through hole and the first connecting hole in sequence to connect the first hard plastic plate 5, the first adapter plate and the first baffle plate 2.

[0068] The second hard plastic plate 6 is detachably connected with the second baffle plate 3 through a second connecting structure, and the second connecting structure includes a second adapter plate, a second connecting hole, a second fixing hole and a fastener.

[0069] The second adapter plate is provided with a plurality of second through holes; the second fixing holes are the same in number as the second through holes and one-to-one corresponding, and the plurality of second connecting holes are uniformly distributed on the second baffle 3 along the first direction; the second fixing holes are the same in number as the second connecting holes and one-to-one corresponding, and the second fixing holes are uniformly distributed on the second hard plastic plate 6 along the first direction; the fasteners pass through the second fixing holes, the second through holes and the second connecting holes in sequence, and the second hard plastic plate 6, the second adapter plate and the second baffle 3 are connected.

[0070] The embodiment of the present application also provides an experimental method for simulating the genesis mechanism of the Dayang Anyue rift trough, which is applied to the experimental device for simulating the genesis mechanism of the Dayang Anyue rift trough. Figure 3 As shown in the figure, it is a plane evolution diagram of the model simulation result, wherein Figure 3 a is a plane feature after uplift, Figure 3 b is a plane feature after denudation, Figure 3 c is a plane feature after extension, Figure 3 d is a plane feature after strike-slip.

[0071] Specifically, the method comprises the following operation steps:

[0072] Step S1: setting experimental parameters.

[0073] In the embodiment, the experimental parameters specifically include the scale of the model, the shape and size of the first hard plastic plate 5 and the second hard plastic plate 6, the size of the extensible plate 4, the number of layers of quartz sand to be laid and the thickness of each layer, the color of the marker layer, the moving speed of the first baffle 2 and the second baffle 3, the size of the supporting member 71 and the rising speed.

[0074] It should be noted that the experiment is carried out at room temperature, the moving speed of each baffle is the same, the color of the marker layer should be different, and the physical properties of the dyed quartz sand do not change, only facilitating subsequent explanation and observation.

[0075] Step S2: laying multiple layers of matrix on the upper surfaces of the extensible plate 4, the first hard plastic plate 5 and the second hard plastic plate 6 in the accommodating cavity, and laying different colors of marker layers on the top surfaces of the layers respectively.

[0076] For example, two layers of quartz sand are laid in the box, the first layer is 3cm thick and the second layer is 1.5cm thick, a red marker layer is laid on the top surface of the first layer, and a green marker layer is laid on the top surface of the second layer.

[0077] Step S3: the lifting mechanism 7 drives the supporting member 71 to rise at a constant speed and contact the extensible plate 4 through the through hole 11 of the experimental platform 1, drives the extensible plate 4 and the overlying quartz sand to be uplifted, and stops after a certain degree of uplift.

[0078] Step S4: scraping the sand body at the high position of the uplift to simulate the denudation movement, and dividing the model into regions according to the denudation degree.

[0079] In some embodiments, the sand body at the high position of the uplift can be scraped by a scraper, which can be a component of the experimental device for simulating the mechanism of the Deyang Anyue rift trough, and can be controlled by the controller 10 to operate, or can be operated manually. The unsealed area of the containing cavity serves as the sand body discharge outlet, for example, the unsealed part of the second baffle 3 and the first baffle 2 serves as the sand body discharge outlet, and is divided into an uneroded region, an exposed region of the first three segments + the fourth segment not completely eroded, and an exposed region of the first three segments + the fourth segment completely eroded, i.e., the first segment + the second segment, according to the denudation degree. Photographs are taken during the experiment to record the phenomena.

[0080] It should be additionally pointed out that the first stop block 12 and the second stop block 13 should be used to better compact the side of the corresponding hard plastic plate during the uplift process to prevent it from being lifted by the uplift of the sand body.

[0081] Step S5: the lifting mechanism 7 drives the support 71 to descend below the experimental platform 1, at the same time, a pair of first driving devices 8 synchronously pull the extensible plate 4 in the first direction to make it do a horizontal stretching movement, and after the obvious sand body rift phenomenon is formed, the stretching is stopped, and the image of the planar stretching feature is obtained.

[0082] It should be noted that the quartz sand in the middle part is stretched by the hard plastic plates pasted on both sides of the extensible plate 4, and the stop blocks no longer compact the hard plastic plates during the stretching process, and the two hard plastic plates are not fixed with the second baffle 3.

[0083] Step S6: continue to lay multiple layers of quartz sand, wherein the first layer of the continued laying fills the previous sand body, and the subsequent multiple layers of quartz sand are laid layer by layer.

[0084] For example, four layers of quartz sand are continued to be laid, wherein the first layer of the continued laying is the filling and patching layer of the Jizhushan Formation + Maidiping Formation after the formation of the rift trough, which is used to fill the middle rift trough of the previous sand body, and the quartz sand in this layer has a thickness of 1 cm in the uneroded region, and the other three layers of quartz sand laid subsequently have thicknesses of 2 cm, 2 cm and 3 cm respectively.

[0085] Step S7: fixing the two hard plastic plates to a pair of second baffles 3 respectively, and disconnecting the two hard plastic plates from the first baffle 2, the second driving device 9 drives the first hard plastic plate 5 and the second hard plastic plate 6 to move relatively and in parallel, and drives the internal regions of all the overlying quartz sand layers to move relatively, forming a strike-slip structure, and obtaining an image of the top surface of the sand body.

[0086] After the experiment is completed, a wet towel needs to be covered on the upper surface of the model (to prevent the experimental results from being affected by subsequent operations), and finally water is poured and left for about 24 hours to ensure that the experimental sand body is shaped for subsequent section observation of the profile experiment phenomenon.

[0087] As shown in Figure 4 a to Figure 4 j, respectively, are cross-section slice diagrams at 6.5 cm, 11.4 cm, 15.5 cm, 19.0 cm, 23.0 cm, 26.5 cm, 30.0 cm, 34.3 cm, 38.8 cm, 41.2 cm from the lower boundary of the model.

[0088] The first baffle 2 is synchronously driven by the first driving device 8, and the two hard plastic plates connected on both sides of the extensible plate 4 are driven to move reversely, so as to pull the extensible plate 4 to make horizontal extension movement, thereby simulating the tension process of the stratum; the lifting mechanism 7 drives the supporting piece 71 to drive the extensible plate 4 and the overlying quartz sand to rise, thereby simulating the stratum uplift caused by the mantle plume uplift, simulating the “activation” effect of the pre-existing basement fracture by using the hard plastic plate, and based on the development form of the Deyang Anyue rift trough, the distribution of the overlying stratum and the characteristics of the fracture system, the first transverse extension and then longitudinal strike-slip mode is adopted, so that the Deyang Anyue rift trough is more scientifically and intuitively simulated.

[0089] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “connected”, “connected” should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0090] In the description of the present application, the description of the terms “one embodiment”, “some embodiments”, “way”, “specific way” or “some ways” means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or way are included in at least one embodiment or way of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or way. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or ways in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or characteristics of the different embodiments or ways described in the present application without contradiction.

[0091] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for simulating the formation mechanism of the Dayang'an Yue rift trough, applied to an experimental device for simulating the formation mechanism of the Dayang'an Yue rift trough, characterized in that, The method comprises the following steps: setting experimental parameters; laying multiple layers of matrix on the upper surfaces of the ductile plate (4), the first hard plastic plate (5) and the second hard plastic plate (6) in the accommodating cavity, and laying a mark layer of different color on the top surface of each layer; the lifting mechanism (7) drives the supporting member (71) to ascend uniformly and pass through the through hole (11) of the experimental platform (1) to contact the ductile plate (4), thereby driving the ductile plate (4) and the overlying quartz sand to be raised, and the raising is stopped after a certain degree of raising; the sand body at the high position of the raised part is scraped off to simulate the denudation movement, and the model is divided into regions according to the denudation degree; the lifting mechanism (7) drives the supporting member (71) to descend below the experimental platform (1), at the same time, a pair of first driving devices (8) are used to pull the ductile plate (4) to make horizontal extension movement in the first direction, and the extension is stopped when the sand body has obvious collapse phenomenon, and the image of the plane extension feature is obtained; multiple layers of quartz sand are continuously laid, wherein the first layer of the continuously laid quartz sand fills the previous sand body, and the subsequent multiple layers of quartz sand are laid layer by layer; the two hard plastic plates are connected to a pair of second baffles (3), and the connection between the two hard plastic plates and the first baffle (2) is released, the second driving device (9) drives the first hard plastic plate (5) and the second hard plastic plate (6) to move relatively and in parallel, and drives the internal regions of all the overlying quartz sand layers to move relatively, thereby forming a strike-slip structure, and the image of the top surface of the sand body is obtained; The experimental device for simulating the formation mechanism of the Deyang Anyue collapse trough comprises: an experimental platform (1) provided with a through hole (11); a baffle assembly arranged on the experimental platform (1) and comprising a pair of first baffles (2) and a pair of second baffles (3), the pair of first baffles (2) and the pair of second baffles (3) can enclose an accommodating cavity with a rectangular cross section; a bearing member arranged at the bottom of the accommodating cavity and used for bearing the matrix of the simulated rock stratum model, the bearing member comprises a ductile plate (4), a first hard plastic plate (5) and a second hard plastic plate (6), the first hard plastic plate (5) and the second hard plastic plate (6) are respectively connected to the upper surfaces of the two sides of the ductile plate (4), one side of the first hard plastic plate (5) and the second hard plastic plate (6) can be respectively detachably connected to the corresponding first baffle (2), and the middle part of the ductile plate (4) corresponds to the through hole (11); a lifting mechanism (7) arranged at the bottom of the experimental platform (1), the driving end of the lifting mechanism (7) is provided with a supporting member (71), and the supporting member (71) can raise the middle part of the ductile plate (4) through the through hole (11); a linear transmission mechanism arranged on the experimental platform (1), the linear transmission mechanism comprises a pair of first driving devices (8), and the pair of first driving devices (8) respectively act on the pair of first baffles (2) and are used for synchronously driving the pair of first baffles (2) to move away from each other in the first direction, so as to pull the ductile plate (4) to make horizontal extension movement; a controller (10) electrically connected with the lifting mechanism (7) and the first driving devices (8). The straight line transmission mechanism further comprises a pair of second driving devices (9) electrically connected with the controller (10), and each of the pair of second driving devices (9) acts on a second baffle (3) to synchronously drive the second baffles (3) to move away from each other in a second direction, so as to drive the first hard plastic plate (5) and the second hard plastic plate (6) to move in opposite directions in parallel.

2. The method of simulating the genesis mechanism of the Anyue rift trough in Deyang according to claim 1, characterized in that, The end of the first hard plastic plate (5) is detachably connected with one of the second baffles (3), and the end of the second hard plastic plate (6) is detachably connected with the other second baffle (3).

3. The method of simulating the genesis mechanism of the Anyue rift trough in Deyang according to claim 1, characterized in that, The upper surface of the supporting piece (71) is a circular arc.

4. The method of simulating the genesis mechanism of the Anyue rift trough in Deyang according to claim 1, characterized in that, Further comprising a first stop block (12) and a second stop block (13), the first stop block (12) is used to press the first hard plastic plate (5) on the experimental platform (1), and the second stop block (13) is used to press the second hard plastic plate (6) on the experimental platform (1).

5. The method of simulating the genesis mechanism of the Anyue rift trough in Deyang according to claim 1, characterized in that, The first hard plastic plate (5) is detachably connected with the first baffle (2) through a first connecting structure, and the first connecting structure comprises: a first adapter plate provided with a plurality of first through holes; a first connecting hole, the number of the first connecting holes is the same as that of the first through holes and one-to-one correspondence, and the plurality of first connecting holes are uniformly distributed on the first baffle (2) in the second direction; a first fixing hole, the number of the first fixing holes is the same as that of the first connecting holes and one-to-one correspondence, and the first fixing holes are uniformly distributed on the first hard plastic plate (5) in the second direction; a fastener, the fastener passes through the first fixing hole, the first through hole and the first connecting hole in sequence, and the first hard plastic plate (5), the first adapter plate and the first baffle (2) are connected.

6. The method of simulating the genesis mechanism of the Anyue rift trough in Deyang according to claim 1, characterized in that, The second hard plastic plate (6) is detachably connected with the second baffle (3) through a second connecting structure, and the second connecting structure comprises: a second adapter plate provided with a plurality of second through holes; a second connecting hole, the number of the second connecting holes is the same as that of the second through holes and one-to-one correspondence, and the plurality of second connecting holes are uniformly distributed on the second baffle (3) in the first direction; a second fixing hole, the number of the second fixing holes is the same as that of the second connecting holes and one-to-one correspondence, and the second fixing holes are uniformly distributed on the second hard plastic plate (6) in the first direction; a fastener, the fastener passes through the second fixing hole, the second through hole and the second connecting hole in sequence, and the second hard plastic plate (6), the second adapter plate and the second baffle (3) are connected.

7. The method of simulating the genesis mechanism of the Anyue rift trough in Deyang according to claim 1, characterized in that, The first driving device (8) and the second driving device (9) are electric push rods, and the driving motor in the electric push rod is a stepping motor.

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