Method, device and terminal for separating pure shear wave field by single excitation of shear wave controllable source

Abstract

The embodiment of the present application discloses a method, device and terminal for separating the pure shear wave field of a shear-wave controllable vibrator excitation, which belongs to the field of oil and gas seismic exploration and seismic data processing. The method includes: collecting first seismic shear wave data and second seismic shear wave data; performing a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data based on the target direction and the seismic survey line direction related to the properties of the stratum medium to be detected under the ground to obtain third seismic shear wave data and fourth seismic shear wave data; adjusting the polarity of the third seismic shear wave data and the polarity of the fourth seismic shear wave data to be consistent, respectively, to obtain a first wave field and a second wave field, the first wave field and the second wave field being the processing results after the pure shear wave wave field of the target seismic shear wave is separated. The method can adapt to changes in the direction of the target seismic shear wave excitation, and can process the collected seismic shear wave data for the target seismic shear wave excited in any direction by means of horizontal two-component rotation and polarity adjustment.

Description

Technical Field

[0001] The embodiments of the present application relate to the fields of oil and gas seismic exploration and seismic data processing, and in particular to a method, device and terminal for separating pure shear wave fields excited once by a shear-wave controllable vibrator. Background Art

[0002] Seismic exploration involves artificially stimulating seismic waves, recording the waves' propagation through the strata, and processing the data to determine the properties of underground rocks and geological structures. Seismic waves are elastic waves that radiate from a source. Seismic waves can be categorized as shear waves or longitudinal waves based on their propagation patterns. Controllable vibrators can also be categorized as shear and longitudinal waves. Shear vibrators excite horizontally, with the excitation energy primarily propagating underground as shear waves. P-wave vibrators excite vertically, with the excitation energy primarily propagating underground as longitudinal waves.

[0003] In related technologies, in order to reduce the cost of seismic exploration, in the process of artificially exciting seismic waves, the number of excitations of two shear waves and one longitudinal wave at each shot point can be reduced to one shear wave and one longitudinal wave, or even no longitudinal wave can be excited, and only one shear wave can be excited.

[0004] However, when using the above-mentioned shear wave seismic exploration method, the relevant technology can only process seismic shear wave data whose direction of seismic shear wave excitation is parallel to the direction of the seismic survey line or whose direction of seismic shear wave excitation is perpendicular to the direction of the seismic survey line. When the direction of seismic shear wave excitation is not fixed, it is difficult to process seismic shear wave data. Summary of the Invention

[0005] The present invention provides a method, device, and terminal for separating pure shear wave fields from a single excitation of a shear-wave vibroseis. The method can process target seismic shear waves excited in any horizontal direction by rotating the horizontal two components and adjusting the polarity to obtain seismic shear wave data after pure shear wave field separation. The technical solution is as follows:

[0006] In one aspect, a method for separating pure shear wave fields from a single excitation of a shear wave vibrator is provided, the method comprising:

[0007] Collecting first seismic shear wave data and second seismic shear wave data, wherein the first seismic shear wave data is seismic shear wave data collected in a direction parallel to the seismic survey line after a shear wave controllable vibrator excites a target seismic shear wave, and the second seismic shear wave data is seismic shear wave data collected in a direction perpendicular to the seismic survey line after the shear wave controllable vibrator excites the target seismic shear wave;

[0008] performing a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data based on a target direction related to properties of a stratum medium to be detected under the ground and the direction of the seismic survey line to obtain third seismic shear wave data and fourth seismic shear wave data, wherein the third seismic shear wave data corresponds to a first direction and the fourth seismic shear wave data corresponds to a second direction, the first direction is parallel to the target direction, and the second direction is perpendicular to the target direction;

[0009] The polarity of the third seismic shear wave data and the polarity of the fourth seismic shear wave data are adjusted to be consistent, thereby obtaining a first wave field and a second wave field, which are the processing results after the pure shear wave field of the target seismic shear wave is separated.

[0010] In another aspect, a shear wave vibroseis primary excitation pure shear wave field separation device is provided, the device comprising:

[0011] an acquisition module, configured to acquire first seismic shear wave data and second seismic shear wave data, wherein the first seismic shear wave data is seismic shear wave data acquired in a direction parallel to a seismic survey line after a shear-wave controllable vibrator excites a target seismic shear wave, and the second seismic shear wave data is seismic shear wave data acquired in a direction perpendicular to the seismic survey line after the shear-wave controllable vibrator excites the target seismic shear wave;

[0012] a horizontal two-component rotation module, configured to perform a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data based on a target direction related to properties of a stratum medium to be detected underground and the direction of the seismic survey line, to obtain third seismic shear wave data and fourth seismic shear wave data, wherein the third seismic shear wave data corresponds to a first direction, and the fourth seismic shear wave data corresponds to a second direction, the first direction is parallel to the target direction, and the second direction is perpendicular to the target direction;

[0013] The polarity adjustment module is used to adjust the polarity of the third seismic shear wave data and the polarity of the fourth seismic shear wave data to be consistent, so as to obtain a first wave field and a second wave field, wherein the first wave field and the second wave field are the processing results after the pure shear wave field of the target seismic shear wave is separated.

[0014] In some embodiments, when the target seismic shear wave propagates in an azimuthally isotropic medium, the target direction is the direction of a line between a shot point and a receiver point; the shot point is the location where the target seismic shear wave is excited, and the receiver point is the location where the first seismic shear wave data and the second seismic shear wave data are collected;

[0015] The horizontal two-component rotation module is used to determine the target direction based on the coordinates of the shot point and the coordinates of the detection point; based on the angle between the target direction and the direction of the seismic survey line, the first seismic shear wave data and the second seismic shear wave data are horizontally rotated to obtain the third seismic shear wave data and the fourth seismic shear wave data.

[0016] In some embodiments, when the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is the direction of an underground fracture;

[0017] The horizontal two-component rotation module is used to obtain the direction of the underground crack based on the azimuthally anisotropic medium; based on the angle between the direction of the underground crack and the direction of the seismic survey line, the first seismic shear wave data and the second seismic shear wave data are horizontally rotated to obtain the third seismic shear wave data and the fourth seismic shear wave data.

[0018] In some embodiments, when the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is a direction perpendicular to the projection of the symmetry axis of the azimuthally anisotropic medium on a horizontal plane;

[0019] The horizontal two-component rotation module is used to obtain the target direction based on the azimuthally anisotropic medium; based on the angle between the target direction and the seismic survey line direction, perform horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data to obtain the third seismic shear wave data and the fourth seismic shear wave data.

[0020] In some embodiments, the polarity adjustment module is used to adjust the negative polarity seismic shear wave data in the third seismic shear wave data and the fourth seismic shear wave data to positive polarity seismic shear wave data based on a first angle and a second angle to obtain adjusted third seismic shear wave data and adjusted fourth seismic shear wave data, wherein the first angle is the angle between the direction of excitation of the target seismic shear wave and the direction of the seismic survey line, and the second angle is the angle between the target direction and the direction of the seismic survey line; based on the adjusted third seismic shear wave data and the adjusted fourth seismic shear wave data, the wave field generated by the target seismic shear wave propagating in the stratum medium to be detected under the ground is separated to obtain the first wave field and the second wave field.

[0021] In some embodiments, when the target seismic shear wave propagates in an azimuthally isotropic medium, the first wavefield is a vertically polarized shear wave field, and the second wavefield is a horizontally polarized shear wave field.

[0022] In some embodiments, when the target seismic shear wave propagates in an azimuthally anisotropic medium, the first wavefield is a fast shear wavefield, and the second wavefield is a slow shear wavefield.

[0023] On the other hand, a terminal is provided, comprising a processor and a memory, wherein the memory stores at least one computer program, and the at least one computer program is loaded and executed by the processor to implement the method for separating pure shear wave fields by single excitation of a shear wave controllable vibrator as described in the above aspects.

[0024] On the other hand, a computer-readable storage medium is provided, in which at least one computer program is stored. The at least one computer program is loaded and executed by a processor to implement the method for separating pure shear wave fields by single excitation of a shear-wave controllable vibrator as described in the above aspects.

[0025] On the other hand, a computer program product is provided, comprising a computer program, wherein the computer program is loaded and executed by a processor to implement the method for separating pure shear wave fields by single excitation of a shear-wave controllable vibrator as described in the above aspects.

[0026] The present invention provides a pure shear wave field separation scheme for single-shot excitation of a shear-wave controllable vibroseis. By collecting seismic shear wave data generated by the shear-wave controllable vibroseis in directions parallel to and perpendicular to the seismic line, first seismic shear wave data and second seismic shear wave data are obtained. This ensures that seismic shear wave data in directions parallel to and perpendicular to the seismic line are collected. By performing a horizontal two-component rotation on the collected seismic shear wave data based on the target direction and the seismic line direction, which are related to the properties of the subsurface stratum medium to be detected, the scheme adapts to changes in the direction of the target seismic shear wave excitation. For target seismic shear wave excitation in any direction, the collected seismic shear wave data can be converted using the horizontal two-component rotation to obtain third seismic shear wave data parallel to the target direction and fourth seismic shear wave data perpendicular to the target direction. By adjusting the polarity of the third seismic shear wave data and the polarity of the fourth seismic shear wave data to be consistent, seismic shear wave data with consistent polarity can be obtained. The first and second wave fields generated by the excitation of the target seismic shear wave can be obtained using the consistent polarity seismic shear wave data. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 This is a schematic diagram of an implementation environment provided by an embodiment of the present application;

[0029] Figure 2 This is a flow chart of a method for separating pure shear wave fields by single excitation of a shear wave vibroseis provided in an embodiment of the present application;

[0030] Figure 3 This is a flow chart of another method for separating pure shear wave fields by single excitation of a shear wave vibroseis provided in an embodiment of the present application;

[0031] Figure 4 is a schematic diagram of seismic shear wave data provided by an embodiment of the present application;

[0032] Figure 5 is a schematic diagram of another type of seismic shear wave data provided in an embodiment of the present application;

[0033] Figure 6 is a schematic diagram of another type of seismic shear wave data provided in an embodiment of the present application;

[0034] Figure 7 is a schematic diagram of another type of seismic shear wave data provided in an embodiment of the present application;

[0035] Figure 8 is a schematic diagram of another type of seismic shear wave data provided in an embodiment of the present application;

[0036] Figure 9 is a schematic diagram of another type of seismic shear wave data provided in an embodiment of the present application;

[0037] Figure 10 This is a schematic structural diagram of a shear wave vibroseis primary excitation pure shear wave field separation device provided in an embodiment of the present application;

[0038] Figure 11 This is a schematic diagram of the structure of a terminal provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0040] It is understood that the terms "first," "second," and the like used herein may be used to describe various concepts herein, but unless otherwise specified, these concepts are not limited by these terms. These terms are merely used to distinguish one concept from another. For example, without departing from the scope of this application, first seismic shear wave data may be referred to as second seismic shear wave data, and similarly, second seismic shear wave data may be referred to as first seismic shear wave data.

[0041] Here, "at least one" refers to one or more than one. For example, the at least one detection point can be one detection point, two detection points, three detection points, or any other integer greater than or equal to one. "Multiple" refers to two or more than two. For example, the multiple detection points can be two detection points, three detection points, or any other integer greater than or equal to two. "Each" refers to each of at least one. For example, "each detection point" refers to each detection point in the multiple detection points. If the multiple detection points are three detection points, "each detection point" refers to each detection point in the three detection points.

[0042] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.) and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions. For example, the first earthquake shear wave data and the second earthquake shear wave data involved in this application were both obtained with full authorization.

[0043] The following introduces the implementation environment of the embodiments of the present application.

[0044] Figure 1 This is a schematic diagram of an implementation environment provided by an embodiment of the present application, see Figure 1 The implementation environment includes: a shear wave controllable source 101, a detector 102 and a terminal 103.

[0045] The shear wave controllable vibroseis 101 is used to excite controllable target seismic shear waves in any direction underground from the shot point. The geophone 102 is used to collect first seismic shear wave data and second seismic shear wave data reflected by the stratum medium to be detected underground at the geophone point.

[0046] The shear wave controllable vibrator 101 may generally refer to one of a plurality of shear wave controllable vibrators. This embodiment uses the shear wave controllable vibrator 101 as an example. Those skilled in the art will appreciate that the number of the shear wave controllable vibrators may be greater or lesser. For example, there may be a few shear wave controllable vibrators, or there may be dozens, hundreds, or even more. This embodiment of the application does not limit the number or device type of the shear wave controllable vibrators.

[0047] The detector 102 may generally refer to one of multiple detectors. This embodiment uses the detector 102 as an example. Those skilled in the art will appreciate that the number of detectors may be greater or lesser. For example, there may be a few detectors, or dozens, hundreds, or even more. This embodiment does not limit the number or type of detectors.

[0048] The terminal 103 can be at least one of a smart phone, a desktop computer, a laptop computer, and a portable computer. An application can be installed and run on the terminal 103, and the application is used to perform horizontal two-component rotation and polarity adjustment on the first seismic shear wave data and the second seismic shear wave data to obtain the first wave field and the second wave field. The user can log in to the application through the terminal 103 to obtain the first wave field and the second wave field. The application is associated with the detector 102, and the detector 102 provides the first seismic shear wave data and the second seismic shear wave data to the terminal 103. The terminal 103 can be connected to the detector 102 via a wireless network or a wired network.

[0049] Terminal 103 may generally refer to one of multiple terminals. This embodiment uses terminal 103 as an example. Those skilled in the art will appreciate that the number of terminals may be greater or lesser. For example, there may be a few terminals, or dozens, hundreds, or even more. This embodiment of the application does not limit the number or device type of terminals.

[0050] Figure 2 This is a flow chart of a method for separating pure shear wave fields by a single excitation of a shear wave vibrator provided in an embodiment of the present application. The embodiment of the present application is executed by a terminal. Figure 2 , the method comprising:

[0051] 201. The terminal collects first seismic shear wave data and second seismic shear wave data. The first seismic shear wave data is seismic shear wave data collected in a direction parallel to the seismic survey line after the target seismic shear wave is excited by a shear wave controllable seismic source. The second seismic shear wave data is seismic shear wave data collected in a direction perpendicular to the seismic survey line after the target seismic shear wave is excited by the shear wave controllable seismic source.

[0052] In an embodiment of the present application, a shear-wave controllable vibroseis can be used to excite target seismic shear waves in any direction underground. After the target seismic shear waves are excited by the shear-wave controllable vibroseis, they propagate through the subsurface stratum to be detected. A terminal can use a geophone to collect first seismic shear wave data and second seismic shear wave data reflected from the subsurface stratum to be detected in directions parallel to and perpendicular to the seismic line, respectively. Optionally, the terminal can also obtain the first seismic shear wave data and the second seismic shear wave data from a server. Based on a seismic shear wave data acquisition request sent by the terminal, the server transmits the first seismic shear wave data and the second seismic shear wave data uploaded to the server by other terminals to the terminal. Accordingly, the other terminals are configured to collect the first seismic shear wave data and the second seismic shear wave data and upload the collected first seismic shear wave data to the server. In the field of seismic exploration, a seismic line is a straight line consisting of multiple seismic measurement points. The seismic line direction is the direction of the line, and the seismic line direction is generally related to the structure and strike of the stratum. The terminal may collect the first seismic shear wave data and the second seismic shear wave data at the location of the seismic measurement point through a geophone.

[0053] 202. The terminal performs a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data based on the target direction and the seismic survey line direction related to the properties of the formation medium to be detected to obtain third seismic shear wave data and fourth seismic shear wave data. The third seismic shear wave data corresponds to the first direction, and the fourth seismic shear wave data corresponds to the second direction. The first direction is parallel to the target direction, and the second direction is perpendicular to the target direction.

[0054] In an embodiment of the present application, the properties of the formation medium to be detected can represent the physical, chemical and other properties of the formation medium to be detected. The seismic shear wave data reflected by the formation medium are different due to the different properties of the formation medium. The terminal can determine the target direction based on the properties of the formation medium. Since the target direction has an angle with the seismic survey line direction, the terminal can perform a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data based on the angle between the target direction and the seismic survey line direction to obtain third seismic shear wave data and fourth seismic shear wave data. By means of horizontal two-component rotation, for target seismic shear waves excited in any direction, based on the angle between the target direction and the seismic survey line direction, the first seismic shear wave data in the direction parallel to the seismic survey line direction and the second seismic shear wave data in the direction perpendicular to the seismic survey line direction can be obtained, which can be based on the angle between the target direction and the seismic survey line direction and the first seismic shear wave data in the direction parallel to the seismic survey line direction and the second seismic shear wave data in the direction perpendicular to the seismic survey line direction.

[0055] 203. The terminal adjusts the polarity of the third earthquake shear wave data and the polarity of the fourth earthquake shear wave data to be consistent, and obtains a first wave field and a second wave field, wherein the first wave field and the second wave field are processing results after the shear wave pure shear wave field of the target earthquake is separated.

[0056] In an embodiment of the present application, the terminal adjusts the negative polarity of the third and fourth seismic shear wave data to positive polarity, thereby obtaining third and fourth seismic shear wave data of both positive polarity. The terminal separates the wave field generated by the target seismic shear wave propagating in the subsurface stratum medium to be detected using the third and fourth seismic shear wave data of both positive polarity, thereby obtaining the first and second wave fields.

[0057] The present invention provides a method for separating pure shear waves from a single excitation of a shear-wave controllable vibroseis source. The method collects seismic shear wave data generated by the excitation of a target seismic shear wave by the shear-wave controllable vibroseis source in a direction parallel to and perpendicular to the seismic line, respectively, to obtain first seismic shear wave data and second seismic shear wave data. This method ensures that seismic shear wave data in directions parallel to and perpendicular to the seismic line are collected. By performing a horizontal two-component rotation on the collected seismic shear wave data based on the target direction and the seismic line direction, which are related to the properties of the subsurface stratum medium to be detected, the method adapts to changes in the direction of the target seismic shear wave excitation. For target seismic shear wave excitation in any horizontal direction, the collected seismic shear wave data can be converted using the horizontal two-component rotation to obtain third seismic shear wave data parallel to the target direction and fourth seismic shear wave data perpendicular to the target direction. By adjusting the polarity of the third seismic shear wave data to be consistent with the polarity of the fourth seismic shear wave data, seismic shear wave data with consistent polarity can be obtained. The first and second wave fields generated by the excitation of the target seismic shear wave can be obtained using the consistent polarity seismic shear wave data.

[0058] above Figure 2 The main process of the method for separating the pure shear wave field by a single excitation of a shear wave controllable source provided in an embodiment of the present application is exemplified. The method for separating the pure shear wave field by a single excitation of a shear wave controllable source is described in detail below. Figure 3 This is a flow chart of another method for separating pure shear wave fields by single excitation of a shear wave vibrator provided in an embodiment of the present application. The method is executed by a terminal. Figure 3 , the method comprising:

[0059] 301. The terminal collects first seismic shear wave data and second seismic shear wave data. The first seismic shear wave data is seismic shear wave data collected in a direction parallel to the seismic survey line after the target seismic shear wave is excited by a shear wave controllable seismic source. The second seismic shear wave data is seismic shear wave data collected in a direction perpendicular to the seismic survey line after the target seismic shear wave is excited by the shear wave controllable seismic source.

[0060] Step 301 is similar to step 201 above and will not be described again here.

[0061] In some embodiments, the terminal collects the first seismic shear wave data and the second seismic shear wave data through a detector. The detector can be a three-component detector. The three-component detector is a special detector used in seismic exploration. The three-component detector is equipped with three mutually perpendicular sensors, and the above sensors can collect shear wave data on three components. The horizontal component of the three-component detector includes an X component and a Y component. The direction corresponding to the X component is parallel to the direction of the seismic survey line, and the direction corresponding to the Y component is perpendicular to the direction of the seismic survey line. Accordingly, the three-component detector collects the first seismic shear wave data on the X component and the second seismic shear wave data on the Y component.

[0062] 302. The terminal determines a target direction related to properties of the stratum medium to be detected.

[0063] In the embodiments of the present application, the formation medium to be detected can be classified as azimuthally isotropic or azimuthally anisotropic, depending on its properties. If a vertical fracture exists within the formation medium, the formation medium can be considered azimuthally anisotropic. Based on the properties of the formation medium to be detected, the terminal determines whether the formation medium is azimuthally isotropic or anisotropic, and determines a target direction related to the properties of the formation medium.

[0064] In some embodiments, when the target seismic shear wave propagates in an azimuthally isotropic medium, the target direction is the direction of the line connecting the shot point and the receiver point. The shot point is the location where the target seismic shear wave is excited, and the receiver point is the location where the first seismic shear wave data and the second seismic shear wave data are collected. The terminal determines the direction of the line connecting the shot point and the receiver point based on the coordinates of the shot point and the receiver point, and uses the direction of the line connecting the shot point and the receiver point as the target direction.

[0065] In some embodiments, when the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is the direction of an underground fracture. If the direction of the underground fracture is unknown, the terminal can perform a shear wave splitting analysis based on PS converted wave seismic data, generated by a P-wave vibrator and received by two horizontal components of a three-component geophone, to determine the direction of the underground fracture and use the underground fracture direction as the target direction. The PS converted wave originates from the seismic source, propagates as a P-wave to the midpoint, and after reflection, propagates as a S-wave to the detection point.

[0066] In some embodiments, when the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is perpendicular to the direction of the projection of the symmetry axis of the azimuthally anisotropic medium on a horizontal plane. The terminal determines the symmetry axis of the azimuthally anisotropic medium based on the azimuthally anisotropic medium, and uses the direction perpendicular to the projection of the symmetry axis on the horizontal plane as the target direction.

[0067] 303. Based on the angle between the target direction and the seismic survey line direction, the terminal performs a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data to obtain third seismic shear wave data and fourth seismic shear wave data. The third seismic shear wave data corresponds to the first direction, and the fourth seismic shear wave data corresponds to the second direction. The first direction is parallel to the target direction, and the second direction is perpendicular to the target direction.

[0068] In an embodiment of the present application, the terminal can perform a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data based on the angle between the target direction and the seismic survey line direction to obtain third seismic shear wave data and fourth seismic shear wave data. Depending on the propagation of the target seismic shear wave in different stratigraphic media, the terminal can perform a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data in the following three ways.

[0069] Method 1: When the target seismic shear wave propagates in an azimuthally isotropic medium, the target direction is the direction of the line between the shot point and the detection point. The terminal determines the angle between the direction of the line between the shot point and the detection point and the direction of the seismic survey line, and records the angle as β. The first seismic shear wave data and the second seismic shear wave data are represented by the vector [Vx Vy]. Among them, Vx is the first seismic shear wave data, and Vy is the second seismic shear wave data. The terminal performs a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data using the following formula (1) to obtain the third seismic shear wave data and the fourth seismic shear wave data.

[0070]

[0071] Where U1 is the shear wave data of the third earthquake. U2 is the shear wave data of the fourth earthquake. Vx is the shear wave data of the first earthquake. Vy is the shear wave data of the second earthquake. β is the angle between the direction of the line connecting the shot point and the receiver point and the direction of the seismic survey line.

[0072] By means of horizontal two-component rotation, for target seismic shear waves excited in any direction, when the target seismic shear waves propagate in an azimuthally isotropic medium, the first seismic shear wave data in a direction parallel to the direction of the seismic survey line and the second seismic shear wave data in a direction perpendicular to the direction of the seismic survey line can be converted based on the angle between the direction of the line between the shot point and the detection point and the direction of the seismic survey line, thereby obtaining third seismic shear wave data in a direction parallel to the direction of the line between the shot point and the detection point and fourth seismic shear wave data in a direction perpendicular to the direction of the line between the shot point and the detection point.

[0073] When the target earthquake shear wave propagates in an azimuthally isotropic medium, Figure 4 This is a schematic diagram of seismic shear wave data. Figure 4 As shown in the figure, the left side is the first seismic shear wave data Vx, the right side is the second seismic shear wave data Vy, the horizontal axis is the azimuth of the detection point, and the vertical axis is the time series. When the detection point collects seismic data, it first collects seismic data reflected by the shallow stratum medium under the ground, and then collects seismic data reflected by the deep stratum medium under the ground. Therefore Figure 4 The vertical axis can represent the time sequence of seismic data acquisition.

[0074] When the target earthquake shear wave propagates in an azimuthally isotropic medium, Figure 5 This is another schematic diagram of seismic shear wave data. Figure 5 As shown, the left side is the third earthquake shear wave data U1, and the right side is the fourth earthquake shear wave data U2.

[0075] Method 2: When the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is the direction of the underground crack. The terminal determines the angle between the direction of the underground crack and the direction of the seismic survey line, and records the angle as γ. The first seismic shear wave data and the second seismic shear wave data are represented by the vector [Vx Vy]. Among them, Vx is the first seismic shear wave data, and Vy is the second seismic shear wave data. The terminal performs a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data using the following formula (2) to obtain the third seismic shear wave data and the fourth seismic shear wave data.

[0076]

[0077] Where U1 is the shear wave data of the third earthquake, U2 is the shear wave data of the fourth earthquake, Vx is the shear wave data of the first earthquake, Vy is the shear wave data of the second earthquake, and γ is the angle between the direction of the underground fracture and the direction of the seismic survey line.

[0078] By rotating the horizontal two components, for target seismic shear waves excited in any direction, when the target seismic shear waves propagate in an azimuthally anisotropic medium, the first seismic shear wave data in a direction parallel to the seismic survey line and the second seismic shear wave data in a direction perpendicular to the seismic survey line can be converted based on the angle between the direction of the underground crack and the direction of the seismic survey line to obtain the third seismic shear wave data in a direction parallel to the direction of the underground crack and the fourth seismic shear wave data in a direction perpendicular to the direction of the underground crack.

[0079] When the target earthquake shear wave propagates in an azimuthally anisotropic medium, Figure 6 is a schematic diagram of another type of seismic shear wave data, such as Figure 6 As shown, the left side is the first earthquake shear wave data Vx, and the right side is the second earthquake shear wave data Vy.

[0080] When the target earthquake shear wave propagates in an azimuthally anisotropic medium, Figure 7 is a schematic diagram of another type of seismic shear wave data, such as Figure 7 As shown, the left side is the third earthquake shear wave data U1, and the right side is the fourth earthquake shear wave data U2.

[0081] Method three: When the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is the vertical direction of the projection direction of the symmetry axis of the azimuthally anisotropic medium on the horizontal plane. The terminal determines the angle between the vertical direction of the projection direction of the symmetry axis of the azimuthally anisotropic medium on the horizontal plane and the direction of the seismic survey line, and records the angle as θ, and represents the first seismic shear wave data and the second seismic shear wave data by the vector [Vx Vy]. Among them, Vx is the first seismic shear wave data, and Vy is the second seismic shear wave data. The terminal performs a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data by the following formula (3) to obtain the third seismic shear wave data and the fourth seismic shear wave data.

[0082]

[0083] Where U1 is the shear wave data of the third earthquake, U2 is the shear wave data of the fourth earthquake, Vx is the shear wave data of the first earthquake, Vy is the shear wave data of the second earthquake, and θ is the angle between the vertical direction of the projection of the symmetry axis of the azimuthally anisotropic medium on the horizontal plane and the direction of the seismic survey line.

[0084] By means of horizontal two-component rotation, for a target seismic shear wave excited in any direction, when the target seismic shear wave propagates in an azimuthally anisotropic medium, the first seismic shear wave data in a direction parallel to the seismic survey line and the second seismic shear wave data in a direction perpendicular to the seismic survey line can be converted based on the angle between the vertical direction of the projection direction of the symmetry axis of the azimuthally anisotropic medium on the horizontal plane and the seismic survey line direction, thereby obtaining third seismic shear wave data in a direction vertically parallel to the projection direction of the symmetry axis of the azimuthally anisotropic medium on the horizontal plane and fourth seismic shear wave data in a direction vertically perpendicular to the projection direction of the symmetry axis of the azimuthally anisotropic medium on the horizontal plane.

[0085] 304. Based on the first angle and the second angle, the terminal adjusts the negative polarity seismic shear wave data in the third seismic shear wave data and the fourth seismic shear wave data to positive polarity seismic shear wave data, respectively, to obtain the adjusted third seismic shear wave data and the adjusted fourth seismic shear wave data. The first angle is the angle between the direction of the target seismic shear wave excitation and the direction of the seismic survey line, and the second angle is the angle between the target direction and the direction of the seismic survey line.

[0086] In an embodiment of the present application, the terminal obtains the direction of the target seismic shear wave excitation, and uses the angle between the direction and the survey line direction as the first angle. Based on the first angle and the second angle, the terminal reverses the polarity of the negative seismic shear wave data in the third seismic shear wave data and the fourth seismic shear wave data, respectively, to obtain positive seismic shear wave data. The adjusted third seismic shear wave data and the adjusted fourth seismic shear wave data are both positive seismic shear wave data, which can avoid the mutual cancellation of seismic shear wave data with opposite polarities when the seismic shear wave data are superimposed. Among them, the direction of the target seismic shear wave excitation can be determined by the angle between the actual excitation direction of the target seismic shear wave and the direction of the seismic survey line. Indicates that the first angle is When the shear wave vibrator excites a target seismic shear wave along any horizontal direction at the shot point position on the ground, It can be changed arbitrarily from 0 to 360 degrees. There can be multiple shot points on the ground, and the excitation directions of the shear wave controllable sources at different shot points can be different.

[0087] It should be noted that when the target seismic shear wave propagates in different strata, the target direction is different, and the second angle is also different. Therefore, the terminal can adjust the polarity of the third seismic shear wave data and the fourth seismic shear wave data in the following three ways.

[0088] Method 1: When the target seismic shear wave propagates in an azimuthally isotropic medium, the target direction is the direction of the line between the shot point and the receiver point. The terminal adjusts the polarity of the third seismic shear wave data and the fourth seismic shear wave data using the following formula (4).

[0089]

[0090] Among them, U1 is the shear wave data of the third earthquake, and U2 is the shear wave data of the fourth earthquake. is the first angle, i.e., the angle between the direction of the target seismic shear wave excitation and the direction of the seismic line. β is the second angle, i.e., the angle between the direction of the line connecting the shot point and the receiver point and the direction of the seismic line. Usv is the adjusted third seismic shear wave data, all with positive polarity. Ush is the adjusted fourth seismic shear wave data, all with positive polarity.

[0091] when When , the third earthquake shear wave data is positive polarity, and the polarity of the third earthquake shear wave data remains unchanged. When the third earthquake shear wave data is negative, the terminal reverses the polarity of the third earthquake shear wave data to obtain the third earthquake shear wave data of positive polarity after adjustment. Usv can represent SV wave (vertically polarized shear wave) data. When the fourth earthquake shear wave data is positive, the polarity of the fourth earthquake shear wave data remains unchanged. When the fourth seismic shear wave data is of negative polarity, the terminal reverses the polarity of the fourth seismic shear wave data to obtain the fourth seismic shear wave data of positive polarity after adjustment. Ush can represent SH wave (horizontally polarized shear wave data) data.

[0092] When the target earthquake shear wave propagates in an azimuthally isotropic medium, Figure 8 is a schematic diagram of another type of seismic shear wave data, such as Figure 8 As shown, the left side is SV wave data and the right side is SH wave data.

[0093] Method 2: When the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is the direction of the underground fracture. The terminal adjusts the polarity of the third seismic shear wave data and the fourth seismic shear wave data using the following formula (5).

[0094]

[0095] Among them, U1 is the shear wave data of the third earthquake, and U2 is the shear wave data of the fourth earthquake. is the first angle, i.e., the angle between the direction of the target seismic shear wave excitation and the direction of the seismic survey line. γ is the second angle, i.e., the angle between the direction of the underground fracture and the direction of the seismic survey line. Uss1 is the third seismic shear wave data with positive polarity after adjustment. Uss2 is the fourth seismic shear wave data with positive polarity after adjustment.

[0096] when When , the third earthquake shear wave data is positive polarity, and the polarity of the third earthquake shear wave data remains unchanged. When the third earthquake shear wave data is negative, the terminal reverses the polarity of the third earthquake shear wave data to obtain the third earthquake shear wave data of positive polarity after adjustment. Uss1 can represent fast shear wave data, that is, SS1 wave data. When , the fourth earthquake shear wave data is positive polarity, and the polarity of the fourth earthquake shear wave data remains unchanged. When the fourth seismic shear wave data is of negative polarity, the terminal reverses the polarity of the fourth seismic shear wave data to obtain fourth seismic shear wave data of positive polarity after adjustment. Uss2 can represent slow shear wave data, namely SS2 wave data.

[0097] When the target earthquake shear wave propagates in an azimuthally anisotropic medium, Figure 9 is a schematic diagram of another type of seismic shear wave data, such as Figure 9 As shown, the left side is SS1 wave data and the right side is SS2 wave data.

[0098] Method 3: When the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is perpendicular to the direction of the projection of the symmetry axis of the azimuthally anisotropic medium on the horizontal plane. The terminal adjusts the polarity of the third seismic shear wave data and the fourth seismic shear wave data using the following formula (6).

[0099]

[0100] Among them, U1 is the shear wave data of the third earthquake, and U2 is the shear wave data of the fourth earthquake. is the first angle, i.e., the angle between the direction of the target seismic shear wave excitation and the direction of the seismic survey line. θ is the second angle, i.e., the angle between the vertical direction of the projection of the symmetry axis of the azimuthally anisotropic medium onto the horizontal plane and the direction of the seismic survey line. Uss1 is the adjusted shear wave data of the third seismic earthquake, all of which have positive polarity. Uss2 is the adjusted shear wave data of the fourth seismic earthquake, all of which have positive polarity.

[0101] when When , the third earthquake shear wave data is positive polarity, and the polarity of the third earthquake shear wave data remains unchanged. When the third earthquake shear wave data is negative, the terminal reverses the polarity of the third earthquake shear wave data to obtain the third earthquake shear wave data of positive polarity after adjustment. Uss1 can represent fast shear wave data, that is, SS1 wave data. When , the fourth earthquake shear wave data is positive polarity, and the polarity of the fourth earthquake shear wave data remains unchanged. When the fourth seismic shear wave data is of negative polarity, the terminal reverses the polarity of the fourth seismic shear wave data to obtain fourth seismic shear wave data of positive polarity after adjustment. Uss2 can represent slow shear wave data, namely SS2 wave data.

[0102] 305. The terminal separates the wave field generated by the target seismic shear wave propagating in the stratum medium to be detected underground based on the adjusted third seismic shear wave data and the adjusted fourth seismic shear wave data to obtain a first wave field and a second wave field.

[0103] In an embodiment of the present application, the terminal separates the wave field generated by the target seismic shear wave propagating in the geological medium to be detected underground based on the third seismic shear wave data and the fourth seismic shear wave data, both of which are positive polarity, to obtain the first wave field and the second wave field.

[0104] In some embodiments, when the target seismic shear wave propagates in an azimuthally isotropic medium, the first wavefield is an SV wavefield, i.e., a vertically polarized seismic shear wave field, and the second wavefield is an SH wavefield, i.e., a horizontally polarized seismic shear wave field. The terminal obtains the SV wavefield based on the third seismic shear wave data, i.e., the SV wave data, all of which are positive polarity. The terminal obtains the SH wavefield based on the fourth seismic shear wave data, i.e., the SH wave data, all of which are positive polarity. By using the third seismic shear wave data and the fourth seismic shear wave data after polarity adjustment, the SV wavefield and the SH wavefield can be accurately separated from the wavefield generated after the target seismic shear wave is excited.

[0105] In some embodiments, when a target seismic shear wave propagates in an azimuthally anisotropic medium, the first wavefield is the SS1 wavefield, i.e., a fast seismic shear wave field, and the second wavefield is the SS2 wavefield, i.e., a slow seismic shear wave field. When the target seismic shear wave passes through the azimuthally anisotropic medium, it splits into an SS1 wave with a polarization direction parallel to the direction of the underground fracture and an SS2 wave with a polarization direction perpendicular to the direction of the underground fracture. The SS1 wavefield is the wavefield consisting of the SS1 waves after the target seismic shear wave is excited, and the SS2 wavefield is the wavefield consisting of the SS2 waves after the target seismic shear wave is excited. The terminal obtains the SS1 wavefield based on the third seismic shear wave data, i.e., the SS1 wave data, all of which have positive polarity. The terminal obtains the SS2 wavefield based on the fourth seismic shear wave data, i.e., the SS2 wave data, all of which have positive polarity. Using the polarity-adjusted third and fourth seismic shear wave data, the SS1 and SS2 wavefields can be accurately separated from the wavefield generated by the excitation of the target seismic shear wave.

[0106] In some embodiments, the terminal can perform post-processing on the obtained first wave field and second wave field. For example, the terminal can perform migration imaging on the first wave field and the second wave field to obtain an image of a reflection interface that can reflect the position of the layer surface and the reflection coefficient value of the stratum medium.

[0107] The present invention provides a method for separating pure shear waves from a single excitation of a shear-wave controllable vibroseis source. The method collects seismic shear wave data generated by the excitation of a target seismic shear wave by the shear-wave controllable vibroseis source in a direction parallel to the seismic line and a direction perpendicular to the seismic line, respectively, to obtain first seismic shear wave data and second seismic shear wave data. This method ensures that seismic shear wave data in directions parallel to and perpendicular to the seismic line are collected. By performing a horizontal two-component rotation on the collected seismic shear wave data based on the target direction and the seismic line direction, which are related to the properties of the subsurface stratum medium to be detected, the method adapts to changes in the direction of the target seismic shear wave excitation. For target seismic shear wave excitation in any direction, the collected seismic shear wave data can be converted using the horizontal two-component rotation to obtain third seismic shear wave data parallel to the target direction and fourth seismic shear wave data perpendicular to the target direction. By adjusting the polarity of the third seismic shear wave data and the polarity of the fourth seismic shear wave data to be consistent, seismic shear wave data with consistent polarity can be obtained. The first and second wave fields generated by the excitation of the target seismic shear wave can be obtained using the consistent polarity seismic shear wave data.

[0108] Figure 10 This is a schematic diagram of the structure of a shear wave controllable source single excitation pure shear wave field separation device provided in an embodiment of the present application. Figure 10 The device includes: an acquisition module 1001, a horizontal two-component rotation module 1002 and a polarity adjustment module 1003.

[0109] An acquisition module 1001 is configured to acquire first seismic shear wave data and second seismic shear wave data, wherein the first seismic shear wave data is seismic shear wave data acquired in a direction parallel to the seismic survey line after a shear wave controllable vibrator excites a target seismic shear wave, and the second seismic shear wave data is seismic shear wave data acquired in a direction perpendicular to the seismic survey line after a shear wave controllable vibrator excites a target seismic shear wave.

[0110] a horizontal two-component rotation module 1002 for performing a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data based on a target direction and a seismic line direction related to properties of a subsurface stratum medium to be detected, to obtain third seismic shear wave data and fourth seismic shear wave data, wherein the third seismic shear wave data corresponds to the first direction and the fourth seismic shear wave data corresponds to the second direction, the first direction being parallel to the target direction and the second direction being perpendicular to the target direction;

[0111] Polarity adjustment module 1003 is used to adjust the polarity of the third seismic shear wave data and the fourth seismic shear wave data to be consistent, and obtain the first wave field and the second wave field, which are the processing results after the target seismic shear wave pure shear wave field is separated.

[0112] In some embodiments, when the target seismic shear wave propagates in an azimuthally isotropic medium, the target direction is the direction of the line between the shot point and the detection point; the shot point is the location where the target seismic shear wave is excited, and the detection point is the location where the first seismic shear wave data and the second seismic shear wave data are collected; the horizontal two-component rotation module 1002 is used to determine the target direction based on the coordinates of the shot point and the coordinates of the detection point; based on the angle between the target direction and the seismic survey line direction, the first seismic shear wave data and the second seismic shear wave data are horizontally rotated in two components to obtain third seismic shear wave data and fourth seismic shear wave data.

[0113] In some embodiments, when the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is the direction of the underground crack; the horizontal two-component rotation module 1002 is used to obtain the direction of the underground crack based on the azimuthally anisotropic medium; based on the angle between the direction of the underground crack and the direction of the seismic survey line, the first seismic shear wave data and the second seismic shear wave data are horizontally rotated in two components to obtain third seismic shear wave data and fourth seismic shear wave data.

[0114] In some embodiments, when the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is vertical to the direction of the projection of the symmetry axis of the azimuthally anisotropic medium on the horizontal plane; the horizontal two-component rotation module 1002 is used to obtain the target direction based on the azimuthally anisotropic medium; based on the angle between the target direction and the seismic survey line direction, the first seismic shear wave data and the second seismic shear wave data are horizontally rotated to obtain third seismic shear wave data and fourth seismic shear wave data.

[0115] In some embodiments, the polarity adjustment module 1003 is used to adjust the negative polarity seismic shear wave data in the third seismic shear wave data and the fourth seismic shear wave data to positive polarity seismic shear wave data based on the first angle and the second angle, to obtain the adjusted third seismic shear wave data and the adjusted fourth seismic shear wave data, wherein the first angle is the angle between the direction of the target seismic shear wave excitation and the direction of the seismic survey line, and the second angle is the angle between the target direction and the direction of the seismic survey line; based on the adjusted third seismic shear wave data and the adjusted fourth seismic shear wave data, the wave field generated by the target seismic shear wave propagating in the stratum medium to be detected underground is separated to obtain the first wave field and the second wave field.

[0116] In some embodiments, when the target seismic shear wave propagates in an azimuthally isotropic medium, the first wavefield is a vertically polarized shear wave field, and the second wavefield is a horizontally polarized shear wave field.

[0117] In some embodiments, when the target seismic shear wave propagates in an azimuthally anisotropic medium, the first wavefield is a fast shear wavefield and the second wavefield is a slow shear wavefield.

[0118] The present invention provides a pure shear wave field separation device for single-shot excitation of a shear-wave controllable vibroseis. The device collects seismic shear wave data generated by the shear-wave controllable vibroseis in directions parallel to and perpendicular to the seismic line, respectively, to obtain first seismic shear wave data and second seismic shear wave data. This ensures that seismic shear wave data in directions parallel to and perpendicular to the seismic line are collected. By performing a horizontal two-component rotation on the collected seismic shear wave data based on the target direction and the seismic line direction, which are related to the properties of the subsurface stratum medium to be detected, the device can adapt to changes in the direction of the target seismic shear wave excitation. For target seismic shear wave excitation in any direction, the collected seismic shear wave data can be converted using the horizontal two-component rotation to obtain third seismic shear wave data parallel to the target direction and fourth seismic shear wave data perpendicular to the target direction. By adjusting the polarity of the third seismic shear wave data and the polarity of the fourth seismic shear wave data to be consistent, seismic shear wave data with consistent polarity can be obtained. The first and second wave fields generated by the excitation of the target seismic shear wave can be obtained using the consistent polarity seismic shear wave data.

[0119] It should be noted that the shear-wave controllable vibrator single-excitation pure shear-wave wavefield separation device provided in the above embodiment is merely illustrated by the division of the above-mentioned functional modules. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the terminal can be divided into different functional modules to complete all or part of the functions described above. In addition, the shear-wave controllable vibrator single-excitation pure shear-wave wavefield separation device provided in the above embodiment and the shear-wave controllable vibrator single-excitation pure shear-wave wavefield separation method embodiment are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0120] An embodiment of the present application also provides a terminal, which includes a processor and a memory, wherein the memory stores at least one computer program, and the at least one computer program is loaded and executed by the processor to implement the method for separating pure shear wave fields by single excitation of a shear wave controllable source in the above embodiment.

[0121] Figure 11 This is a schematic diagram of the structure of a terminal provided in an embodiment of the present application.

[0122] The terminal 1100 includes a processor 1101 and a memory 1102 .

[0123] The processor 1101 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 1101 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field Programmable Gate Array), or PLA (Programmable Logic Array). The processor 1101 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 1101 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 1101 may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0124] Memory 1102 may include one or more computer-readable storage media, which may be non-transitory. Memory 1102 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices and flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in memory 1102 is used to store at least one computer program, which is used by processor 1101 to implement the method for separating pure shear waves from a single excitation of a shear-wave controllable vibrator provided in the method embodiments of this application.

[0125] In some embodiments, terminal 1100 may also optionally include a peripheral device interface 1103 and at least one peripheral device. Processor 1101, memory 1102, and peripheral device interface 1103 may be connected via a bus or signal lines. Each peripheral device may be connected to peripheral device interface 1103 via a bus, signal lines, or circuit boards. Optionally, the peripheral device includes at least one of a radio frequency circuit 1104, a display screen 1105, a camera assembly 1106, an audio circuit 1107, and a power supply 1108.

[0126] The peripheral device interface 1103 can be used to connect at least one I / O (Input / Output)-related peripheral device to the processor 1101 and the memory 1102. In some embodiments, the processor 1101, the memory 1102, and the peripheral device interface 1103 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 1101, the memory 1102, and the peripheral device interface 1103 can be implemented on separate chips or circuit boards, which is not limited in this embodiment.

[0127] The RF circuit 1104 is used to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The RF circuit 1104 communicates with communication networks and other communication devices via electromagnetic signals. The RF circuit 1104 converts electrical signals into electromagnetic signals for transmission, or converts received electromagnetic signals into electrical signals. Optionally, the RF circuit 1104 includes an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a user identity module card, and the like. The RF circuit 1104 can communicate with other devices via at least one wireless communication protocol. Such wireless communication protocols include, but are not limited to, metropolitan area networks, various generations of mobile communication networks (2G, 3G, 4G, and 5G), wireless local area networks, and / or WiFi (Wireless Fidelity) networks. In some embodiments, the RF circuit 1104 may also include circuits related to Near Field Communication (NFC), which is not limited in this application.

[0128] The display screen 1105 is used to display a UI (User Interface). The UI may include graphics, text, icons, videos, and any combination thereof. When the display screen 1105 is a touch screen display, the display screen 1105 also has the ability to collect touch signals on the surface or above the surface of the display screen 1105. The touch signal can be input as a control signal to the processor 1101 for processing. At this time, the display screen 1105 can also be used to provide virtual buttons and / or virtual keyboards, also known as soft buttons and / or soft keyboards. In some embodiments, there can be one display screen 1105, which is set on the front panel of the terminal 1100; in other embodiments, there can be at least two display screens 1105, which are respectively set on different surfaces of the terminal 1100 or in a folding design; in other embodiments, the display screen 1105 can be a flexible display screen, which is set on the curved surface or folding surface of the terminal 1100. Even more, the display screen 1105 can be set to a non-rectangular irregular shape, that is, a special-shaped screen. The display screen 1105 can be made of materials such as LCD (Liquid Crystal Display) and OLED (Organic Light-Emitting Diode).

[0129] The camera assembly 1106 is used to capture images or videos. Optionally, the camera assembly 1106 includes a front camera and a rear camera. The front camera is arranged on the front panel of the terminal 1100, and the rear camera is arranged on the back of the terminal 1100. In some embodiments, there are at least two rear cameras, which are any one of a main camera, a depth of field camera, a wide-angle camera, and a telephoto camera, so as to realize the fusion of the main camera and the depth of field camera to realize the background blur function, the fusion of the main camera and the wide-angle camera to realize panoramic shooting and VR (Virtual Reality) shooting function or other fusion shooting functions. In some embodiments, the camera assembly 1106 may also include a flash. The flash can be a single-color temperature flash or a dual-color temperature flash. The dual-color temperature flash refers to a combination of a warm light flash and a cold light flash, which can be used for light compensation under different color temperatures.

[0130] The audio circuit 1107 may include a microphone and a speaker. The microphone is used to collect sound waves from the user and the environment, and convert the sound waves into electrical signals that are input into the processor 1101 for processing, or input into the radio frequency circuit 1104 to achieve voice communication. For the purpose of stereo sound collection or noise reduction, there may be multiple microphones, each located in different parts of the terminal 1100. The microphone may also be an array microphone or an omnidirectional collection microphone. The speaker is used to convert electrical signals from the processor 1101 or the radio frequency circuit 1104 into sound waves. The speaker may be a traditional thin film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can not only convert electrical signals into sound waves audible to humans, but also convert electrical signals into sound waves inaudible to humans for purposes such as distance measurement. In some embodiments, the audio circuit 1107 may also include a headphone jack.

[0131] Power supply 1108 is used to power various components in terminal 1100. Power supply 1108 can be AC ​​power, DC power, a disposable battery, or a rechargeable battery. When power supply 1108 includes a rechargeable battery, the rechargeable battery can support wired charging or wireless charging. The rechargeable battery can also be used to support fast charging technology.

[0132] In some embodiments, the terminal 1100 further includes one or more sensors 1109 , including but not limited to: an acceleration sensor 1110 , a gyroscope sensor 1111 , a pressure sensor 1112 , an optical sensor 1113 , and a proximity sensor 1114 .

[0133] The accelerometer 1110 can detect the magnitude of acceleration along the three coordinate axes of the coordinate system established by the terminal 1100. For example, the accelerometer 1110 can be used to detect the components of gravity acceleration along the three coordinate axes. The processor 1101 can control the display screen 1105 to display the user interface in either a landscape or portrait view based on the gravity acceleration signal collected by the accelerometer 1110. The accelerometer 1110 can also be used to collect game or user motion data.

[0134] The gyroscope sensor 1111 can detect the orientation and rotation angle of the terminal 1100. The gyroscope sensor 1111 can work with the accelerometer 1110 to collect the user's 3D movements on the terminal 1100. Based on the data collected by the gyroscope sensor 1111, the processor 1101 can implement the following functions: motion sensing (such as changing the UI based on the user's tilt operation), image stabilization during shooting, game control, and inertial navigation.

[0135] The pressure sensor 1112 can be provided on the side frame of the terminal 1100 and / or below the display screen 1105. When the pressure sensor 1112 is provided on the side frame of the terminal 1100, it can detect the user's gripping signal of the terminal 1100, and the processor 1101 can perform left-hand or right-hand recognition or shortcut operations based on the gripping signal collected by the pressure sensor 1112. When the pressure sensor 1112 is provided below the display screen 1105, the processor 1101 controls the operable controls on the UI interface based on the user's pressure operation on the display screen 1105. Operable controls include at least one of a button control, a scroll bar control, an icon control, and a menu control.

[0136] Optical sensor 1113 is used to detect ambient light intensity. In one embodiment, processor 1101 can control the display brightness of display screen 1105 based on the ambient light intensity detected by optical sensor 1113. Optionally, when the ambient light intensity is high, the display brightness of display screen 1105 is increased; when the ambient light intensity is low, the display brightness of display screen 1105 is decreased. In another embodiment, processor 1101 can also dynamically adjust the shooting parameters of camera assembly 1106 based on the ambient light intensity detected by optical sensor 1113.

[0137] Proximity sensor 1114, also known as a distance sensor, is disposed on the front panel of terminal 1100. Proximity sensor 1114 is used to detect the distance between the user and the front of terminal 1100. In one embodiment, when proximity sensor 1114 detects that the distance between the user and the front of terminal 1100 is gradually decreasing, processor 1101 controls display screen 1105 to switch from the screen-on state to the screen-off state. When proximity sensor 1114 detects that the distance between the user and the front of terminal 1100 is gradually increasing, processor 1101 controls display screen 1105 to switch from the screen-off state to the screen-on state.

[0138] Those skilled in the art will understand that Figure 11 The structure shown in the figure does not constitute a limitation on the terminal 1100, and the terminal 1100 may include more or fewer components than shown in the figure, or combine certain components, or adopt a different component arrangement.

[0139] An embodiment of the present application also provides a computer-readable storage medium, which stores at least one computer program. The at least one computer program is loaded and executed by a processor to implement the method for separating pure shear waves from a single excitation of a shear-wave controllable vibrator in the above embodiment.

[0140] The embodiment of the present application further provides a computer program product, including a computer program, which is loaded and executed by a processor to implement the method for separating pure shear waves from a single excitation of a shear-wave controllable vibroseis as described in the above embodiment.

[0141] Those skilled in the art will understand that all or part of the steps for implementing the above embodiments may be accomplished by hardware, or may be accomplished by instructing the relevant hardware through a program, and the above program may be stored in a computer-readable storage medium, which may be a read-only memory, a disk, or an optical disk, etc.

[0142] The above are only optional embodiments of the embodiments of the present application and are not intended to limit the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A method for separating pure shear wave fields from a single excitation of a shear wave vibrator, characterized in that: The method comprises: Collecting first seismic shear wave data and second seismic shear wave data, wherein the first seismic shear wave data is seismic shear wave data collected in a direction parallel to the seismic survey line after a shear wave controllable vibrator excites a target seismic shear wave, and the second seismic shear wave data is seismic shear wave data collected in a direction perpendicular to the seismic survey line after the shear wave controllable vibrator excites the target seismic shear wave; performing a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data based on a target direction related to properties of a stratum medium to be detected underground and the direction of the seismic survey line to obtain third seismic shear wave data and fourth seismic shear wave data, wherein the third seismic shear wave data corresponds to a first direction and the fourth seismic shear wave data corresponds to a second direction, the first direction is parallel to the target direction, and the second direction is perpendicular to the target direction; Adjusting the polarity of the third seismic shear wave data and the polarity of the fourth seismic shear wave data to be consistent respectively, to obtain a first wave field and a second wave field, wherein the first wave field and the second wave field are the processing results after the pure shear wave field of the target seismic shear wave is separated; The step of adjusting the polarity of the third seismic shear wave data and the polarity of the fourth seismic shear wave data to be consistent to obtain the first wave field and the second wave field comprises: adjusting the negative polarity seismic shear wave data in the third seismic shear wave data and the fourth seismic shear wave data to positive polarity seismic shear wave data based on a first angle and a second angle, to obtain adjusted third seismic shear wave data and adjusted fourth seismic shear wave data, wherein the first angle is the angle between the direction of the target seismic shear wave excitation and the direction of the seismic survey line, and the second angle is the angle between the target direction and the direction of the seismic survey line; Based on the adjusted third seismic shear wave data and the adjusted fourth seismic shear wave data, the wave field generated by the target seismic shear wave propagating in the stratum medium to be detected under the ground is separated to obtain the first wave field and the second wave field.

2. The method according to claim 1, characterized in that When the target seismic shear wave propagates in an azimuthally isotropic medium, the target direction is the direction of a line between a shot point and a detection point; the shot point is the location where the target seismic shear wave is excited, and the detection point is the location where the first seismic shear wave data and the second seismic shear wave data are collected; Based on a target direction related to properties of a stratum medium to be detected underground and the direction of the seismic survey line, performing a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data to obtain third seismic shear wave data and fourth seismic shear wave data, comprising: Determining the target direction based on the coordinates of the shot point and the coordinates of the detection point; Based on the angle between the target direction and the seismic survey line direction, the first seismic shear wave data and the second seismic shear wave data are horizontally rotated with two components to obtain the third seismic shear wave data and the fourth seismic shear wave data.

3. The method according to claim 1, characterized in that In the case where the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is the direction of an underground fracture; Based on a target direction related to properties of a stratum medium to be detected underground and the direction of the seismic survey line, performing a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data to obtain third seismic shear wave data and fourth seismic shear wave data, comprising: Based on the azimuthally anisotropic medium, obtaining the direction of the underground fracture; Based on the angle between the direction of the underground crack and the direction of the seismic survey line, the first seismic shear wave data and the second seismic shear wave data are horizontally rotated with two components to obtain the third seismic shear wave data and the fourth seismic shear wave data.

4. The method according to claim 1, wherein In the case where the target seismic shear wave propagates in an azimuthally anisotropic medium, the target direction is a direction perpendicular to the projection of the symmetry axis of the azimuthally anisotropic medium on a horizontal plane; Based on a target direction related to properties of a stratum medium to be detected underground and the direction of the seismic survey line, performing a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data to obtain third seismic shear wave data and fourth seismic shear wave data, comprising: Based on the azimuthally anisotropic medium, obtaining the target direction; Based on the angle between the target direction and the seismic survey line direction, the first seismic shear wave data and the second seismic shear wave data are horizontally rotated with two components to obtain the third seismic shear wave data and the fourth seismic shear wave data.

5. The method according to claim 1, wherein In the case where the target seismic shear wave propagates in an azimuthally isotropic medium, the first wavefield is a vertically polarized shear wave field, and the second wavefield is a horizontally polarized shear wave field.

6. The method according to claim 1, characterized in that When the target seismic shear wave propagates in an azimuthally anisotropic medium, the first wavefield is a fast shear wavefield, and the second wavefield is a slow shear wavefield.

7. A shear wave vibroseis primary excitation pure shear wave field separation device, characterized in that: The device comprises: an acquisition module, configured to acquire first seismic shear wave data and second seismic shear wave data, wherein the first seismic shear wave data is seismic shear wave data acquired in a direction parallel to a seismic survey line after a shear-wave controllable vibrator excites a target seismic shear wave, and the second seismic shear wave data is seismic shear wave data acquired in a direction perpendicular to the seismic survey line after the shear-wave controllable vibrator excites the target seismic shear wave; a horizontal two-component rotation module, configured to perform a horizontal two-component rotation on the first seismic shear wave data and the second seismic shear wave data based on a target direction related to properties of a stratum medium to be detected underground and the direction of the seismic survey line, to obtain third seismic shear wave data and fourth seismic shear wave data, wherein the third seismic shear wave data corresponds to a first direction, and the fourth seismic shear wave data corresponds to a second direction, the first direction is parallel to the target direction, and the second direction is perpendicular to the target direction; a polarity adjustment module, configured to adjust the polarity of the third seismic shear wave data and the polarity of the fourth seismic shear wave data to be consistent with each other, thereby obtaining a first wave field and a second wave field, wherein the first wave field and the second wave field are the processing results after the pure shear wave field of the target seismic shear wave is separated; In which, the polarity adjustment module is used to adjust the negative polarity seismic shear wave data in the third seismic shear wave data and the fourth seismic shear wave data to positive polarity seismic shear wave data based on a first angle and a second angle to obtain adjusted third seismic shear wave data and adjusted fourth seismic shear wave data, wherein the first angle is the angle between the direction of the target seismic shear wave excitation and the direction of the seismic survey line, and the second angle is the angle between the target direction and the direction of the seismic survey line; based on the adjusted third seismic shear wave data and the adjusted fourth seismic shear wave data, the wave field generated by the target seismic shear wave propagating in the stratum medium to be detected under the ground is separated to obtain the first wave field and the second wave field.

8. A terminal, characterized in that: The terminal includes a processor and a memory, wherein the memory stores at least one computer program, and the at least one computer program is loaded and executed by the processor to implement the method for separating pure shear waves from a single excitation of a shear-wave controllable vibroseis according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores at least one computer program, which is loaded and executed by a processor to implement the method for separating pure shear waves from a single excitation of a shear-wave controllable vibroseis according to any one of claims 1 to 6.

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