Scalar Shear Wave Source Device Based on Controllable Source and Its Data Acquisition and Processing Method

Abstract

This invention provides a scalar shear wave source device based on a vehicle-mounted controllable seismic source. It replaces the vibrating plate of the vehicle-mounted controllable seismic source with a scalar shear wave excitation disc-shaped metal vibrating plate, with coupling teeth annularly installed below the bottom surface of the disc-shaped metal vibrating plate. When the source activation controller sends a positive trigger pulse signal, it drives the disc-shaped metal vibrating plate of the scalar shear wave source device to vibrate and rotate clockwise; when the source activation controller sends a negative trigger pulse signal, it drives the disc-shaped metal vibrating plate of the scalar shear wave source device to rotate and vibrate counterclockwise. This causes the annularly installed coupling teeth below the bottom surface of the rigid disc-shaped metal vibrating plate to rotate and vibrate clockwise or counterclockwise, generating scalar shear waves that are parallel to the ground and rotated and polarized clockwise or counterclockwise, propagating into the underground semi-space, thus truly realizing pure scalar shear wave seismic exploration parallel to the ground.

Description

Technical Field

[0001] This invention belongs to the field of excitation methods for seismic exploration sources in geophysical exploration technology, specifically referring to a scalar shear wave source device based on a controllable source and its data acquisition and processing method. Background Technology

[0002] Seismic waves in seismic exploration are artificially generated. Artificial seismic sources are generally divided into two main types: explosive sources and non-explosive sources. Explosive sources mainly use solid explosives, detonators, and physical explosions (air guns, electric sparks, hammers, etc.), but each method has relatively limited excitation range and operating conditions.

[0003] A controlled seismic source is a non-destructive seismic source capable of generating sinusoidal signals with low energy density and controllable waveforms. It is a non-explosive mechanical seismic source that generates seismic waves by continuously impacting the ground with a vibrator mounted on a special vehicle; it is also known as a continuous vibration source because the duration and frequency variation of the vibration can be artificially controlled. Its basic working principle involves transmitting a series of continuously vibrating elastic wave signals (also known as scanning signals) into the ground via a vibrating plate tightly coupled to the earth. The reflected wave signals received at the ground are then processed and identified to interpret the structural morphology and orientation of underground geological targets. This scanning signal is a continuous, frequency-varying signal. Not all continuous signals can be used for seismic exploration. Except for pseudo-random signals, the scanning signal of a controllable source must meet the following basic requirements: (1) It has corresponding start and end frequencies; (2) It has corresponding start and end edge functions (slopes); (3) It has a certain scanning time; (4) The scanning signal can be strictly monotonically increasing or decreasing frequency (linear), or it can be nonlinear.

[0004] Currently, the various seismic source devices or equipment used in the seismic exploration industry on land can individually generate P-wave source signals or S-wave source signals with different polarizations. There are currently no high-power scalar S-wave source devices capable of generating scalar S-wave source signals for routine production. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a scalar shear wave source device based on a controllable seismic source and its data acquisition and processing method.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] The scalar shear wave source device based on a controllable vibration source includes a vehicle-mounted controllable vibration source capable of generating vertical vibration signals and energy. The vehicle-mounted controllable vibration source is equipped with a vibration control system, an electro-hydraulic servo-controlled vibrator, a hydraulic servo system, a servo valve, and a reaction weight. The vibration control system is connected to the electro-hydraulic servo-controlled vibrator, the hydraulic servo system, the servo valve, and the reaction weight. The vehicle-mounted controllable vibration source is also equipped with a vertical linear vibration to horizontal rotational vibration conversion system for converting vertical vibration signals and energy into clockwise or counterclockwise rotating vibration signals, and a scalar shear wave excited rigid disc-shaped metal vibrating plate for clockwise or counterclockwise rotating vibration. At least one coupling tooth is eccentrically provided on the bottom surface of the scalar shear wave excited rigid disc-shaped metal vibrating plate. The vertical linear vibration to horizontal rotational vibration conversion system and the scalar shear wave excited rigid disc-shaped metal vibrating plate are connected. The vibration control system includes either a synchronous vibration control system or a controllable source electrical control system. Both synchronous vibration control systems and controllable source electrical control systems are existing technologies. The vertical linear vibration to horizontal rotational vibration conversion system can employ any existing, common transmission mechanism that converts translational motion into rotational motion on the normal plane of the original translational direction. Its function is to enable the vertical linear vibration to horizontal rotational vibration conversion system to convert the vertical vibration signal and energy of the vehicle-mounted controllable source into a clockwise or counterclockwise rotating vibration signal when the scalar shear wave source device is operating.

[0008] The vehicle-mounted controllable vibration source is equipped with a vibration source start controller.

[0009] It also includes a ground-based scalar shear wave receiver for real-time reception of scalar shear waves excited by the rotational vibration of the coupling teeth. The ground-based scalar shear wave receiver is deployed and buried on the ground within the scalar shear wave seismic exploration area where the scalar shear wave source device operates, according to the construction design. The ground-based scalar shear wave receiver includes sensors or detectors on a two-dimensional scalar shear wave signal receiving sensor line or a three-dimensional scalar shear wave signal receiving sensor network.

[0010] The coupling teeth are uniformly distributed in a ring shape concentric with the bottom surface of the rigid disc-shaped metal vibrating plate excited by scalar shear waves on the bottom surface of the plate.

[0011] The coupling teeth are arranged in multiple rings, concentric with the bottom surface of the rigid disc-shaped metal vibrating plate excited by scalar shear waves, and are uniformly distributed on the bottom surface of the rigid disc-shaped metal vibrating plate excited by scalar shear waves.

[0012] The coupling teeth are cone-shaped, with the outer diameter gradually decreasing towards the rigid disk-shaped metal vibrating plate that is away from the scalar transverse wave excitation.

[0013] Before construction, the weight of the vehicle-mounted controllable scalar shear wave source device is used to press the coupling teeth, which are installed in a ring below the bottom surface of the rigid disc-shaped metal vibration plate of the scalar shear wave source device, into the ground, so that the scalar shear wave source device and the ground can form a good coupling.

[0014] The vibration control system is connected to the vibration source start controller via a wired or wireless network.

[0015] When the source start controller sends a positive trigger pulse signal, the vibration control system drives the scalar shear wave source device to excite the rigid disc-shaped metal vibrating plate to vibrate and rotate in a clockwise direction; when the source start controller sends a negative trigger pulse signal, the vibration control system drives the scalar shear wave source device to excite the rigid disc-shaped metal vibrating plate to rotate and vibrate in a counterclockwise direction.

[0016] When the scalar shear wave source device excites the rigid disc-shaped metal vibrating plate to vibrate and rotate in a clockwise or counterclockwise direction, it drives the coupling teeth installed in a ring below the bottom surface of the rigid disc-shaped metal vibrating plate to rotate and vibrate in a clockwise or counterclockwise direction, so that it produces a scalar shear wave that is parallel to the ground and rotates and polarizes in a clockwise or counterclockwise direction and propagates into the underground space.

[0017] The scalar shear wave seismic data acquisition and processing method based on a vehicle-mounted controllable seismic source device is characterized by comprising the following steps:

[0018] S1. On the ground within the scalar shear wave seismic exploration area, a two-dimensional excitation line or a three-dimensional excitation network of the scalar shear wave source is laid out according to the construction design for the movement of the vehicle-mounted controllable seismic source.

[0019] S2. Two-dimensional scalar shear wave signal receiving sensor survey lines or three-dimensional scalar shear wave signal receiving sensor networks are laid out and buried on the ground in the scalar shear wave seismic exploration area according to the construction design. Ground scalar shear wave receiving devices are installed on the two-dimensional scalar shear wave signal receiving sensor survey lines or three-dimensional scalar shear wave signal receiving sensor networks.

[0020] S3. Move the vehicle-mounted scalar shear wave source device to the scalar shear wave source point on the pre-designed scalar shear wave source two-dimensional excitation line or three-dimensional excitation network, and then use the self-weight of the vehicle-mounted scalar shear wave source device to press the coupling teeth installed in a ring below the bottom surface of the rigid disc-shaped metal vibration plate of the scalar shear wave excitation device into the ground, so that the scalar shear wave source device and the ground form a good coupling.

[0021] S4. The vibration control system sends a pulse to start and begin receiving scalar shear wave signals. This pulse signal is transmitted to the vibration source start controller via a wired or wireless network, triggering the vehicle-mounted scalar shear wave vibration source device to excite scalar shear wave signals that rotate and vibrate in a clockwise or counterclockwise direction, causing the scalar shear wave to excite the rigid disc-shaped metal vibration plate to rotate and vibrate in a clockwise or counterclockwise direction.

[0022] S5. The two-dimensional scalar shear wave signal receiving sensor survey line or three-dimensional scalar shear wave signal receiving sensor network, which is laid out and buried on the ground according to the construction design in the scalar shear wave seismic exploration area, receives the direct scalar shear wave excited by the vehicle-mounted scalar shear wave source device and the reflected scalar shear wave reflected back to the ground from the underground wave impedance interface under the control of the start pulse issued by the vibration control system.

[0023] S6. The vehicle-mounted scalar shear wave source device, following steps S3 to S5, sequentially excites two scalar shear wave signals with opposite rotation directions and parallel to the ground at each scalar shear wave source point location on the ground within the scalar shear wave seismic exploration area, in clockwise and counterclockwise directions. The ground scalar shear wave receiver receives the direct scalar shear wave excited by the vehicle-mounted scalar shear wave source device and the reflected scalar shear wave reflected back to the ground from the underground wave impedance interface.

[0024] S7. Combine and merge the two direct and reflected scalar shear wave data that are excited sequentially by all scalar shear wave source points in opposite directions and parallel to the ground to form two scalar shear wave seismic data volumes rotating in two directions.

[0025] S8. The ground scalar shear wave receiving device deployed on the ground in the scalar shear wave seismic exploration area can record the upward scalar shear wave data generated by the downward scalar shear wave excited by the ground scalar shear wave source and reflected back to the ground at the interface of each wave impedance in the underground.

[0026] S9. Taking a scalar shear wave source point in the scalar shear wave seismic exploration area as the center, extract gather data from all ground scalar shear wave receiving devices at azimuth angles of 5 to 10 degrees, and calculate the velocity of the direct scalar shear wave point by point based on the straight distance from the source center to each ground scalar shear wave receiving device and the first arrival time of the direct scalar shear wave.

[0027] S10. Based on the velocity distribution values ​​of direct scalar shear waves in all directions of the scalar shear wave seismic exploration area calculated in step S9, determine the azimuth angles of the fastest and slowest direct scalar shear wave velocities in the exploration area.

[0028] S11. Based on the ratio of the fastest and slowest direct scalar shear wave velocities at different azimuth angles within the scalar shear wave seismic exploration area calculated in step S10, determine the scalar shear wave anisotropy coefficients at different azimuth angles within the exploration area.

[0029] S12. Based on the azimuth angles of the fastest and slowest direct scalar shear wave velocities within the work area determined in step S10, the scalar shear wave data volume calculated in step S10 is rotated to obtain the reflected scalar shear wave horizontal component data volume parallel to the direction of the fastest scalar shear wave velocity and the reflected scalar shear wave horizontal component data volume perpendicular to the direction of the fastest scalar shear wave velocity.

[0030] S13. Perform radiation-preserving imaging processing on the two sets of reflection scalar shear wave data volumes obtained in step S12, and combine the two sets of reflection scalar shear wave radiation-preserving imaging data volumes to perform fine structural interpretation of underground geological bodies and identification of fractures and faults.

[0031] S14. Extract various attribute volumes sensitive to underground reservoir fluids from the two sets of reflection scalar shear wave radiation-preserving imaging data obtained in step S12. Then, calibrate the data using the attributes of the scalar shear wave seismic logging data in the well within the exploration area and the attributes of the reflection scalar shear wave radiation-preserving imaging data. Finally, identify the reservoir fluid type and evaluate and predict the oil and gas saturation distribution around the well based on the reservoir structure distribution interpreted by fine structural analysis.

[0032] This invention provides a scalar shear wave source device based on a vehicle-mounted controllable seismic source. It replaces the vibrating plate of the vehicle-mounted controllable seismic source with a rigid disc-shaped metal vibrating plate excited by scalar shear waves. Coupling teeth are annularly installed below the bottom surface of the rigid disc-shaped metal vibrating plate. The weight of the vehicle-mounted controllable seismic source device is used to press the annularly installed coupling teeth below the bottom surface of the rigid disc-shaped metal vibrating plate below the ground, ensuring good coupling between the scalar shear wave source device and the earth. When the source activation controller sends a positive trigger pulse signal, it drives the rigid disc-shaped metal vibrating plate of the scalar shear wave source device to vibrate and rotate clockwise; when the source activation controller sends a negative trigger pulse signal, it drives the rigid disc-shaped metal vibrating plate of the scalar shear wave source device to vibrate and rotate counterclockwise. When the rigid disc-shaped metal vibrating plate of the scalar shear wave source device vibrates and rotates clockwise or counterclockwise, it drives the coupling teeth installed in a ring below the bottom of the rigid disc-shaped metal vibrating plate to rotate and vibrate clockwise or counterclockwise, producing scalar shear waves that are parallel to the ground and propagate into the underground half-space. Since the downward propagating scalar shear waves do not undergo wavefield mode conversion when they encounter the underground wave impedance interface, and do not generate converted P-waves that are reflected upward or refracted downward at the wave impedance interface, the signals recorded by the ground scalar shear wave sensor only contain the direct scalar shear waves and the upward reflected scalar shear waves from the wave impedance interface, without interference from upward converted P-waves, truly achieving pure scalar shear wave seismic exploration parallel to the ground. Attached Figure Description

[0033] Figure 1 This is a simplified structural diagram of the scalar shear wave source device based on a vehicle-mounted controllable seismic source of the present invention.

[0034] Figure 2 This is a top view of the bottom of the rigid disc-shaped metal vibration plate excited by scalar transverse waves and the coupling teeth mounted in a ring according to the present invention.

[0035] Figure 3 This is a schematic diagram of the deployment of the scalar shear wave source device of the present invention for scalar shear wave data acquisition in the field;

[0036] Figure 4 This is a three-dimensional example diagram of the vertical linear vibration to horizontal rotational vibration conversion system in Example 1.

[0037] Reference numerals: 1-Vehicle-mounted controllable vibration source, 2-Scalar shear wave excited rigid disc-shaped metal vibrating plate, 3-Coupled tooth, 4-Vibration control system, 5-Electro-hydraulic servo-controlled vibrator, 6-Hydraulic servo system, 7-Servo valve, 8-Reaction weight, 9-Vertical linear vibration to horizontal rotational vibration conversion system, 10-Vibration source start controller, 11-Ground scalar shear wave receiving device. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "longitudinal," "lateral," "horizontal," "inner," "outer," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Example 1

[0042] The implementation of the scalar shear wave source device based on a vehicle-mounted controllable seismic source of the present invention is as follows:

[0043] refer to Figure 1 The scalar shear wave source device based on a vehicle-mounted controllable vibration source includes a vehicle-mounted controllable vibration source 1 capable of generating vertical vibration signals and energy. The vehicle-mounted controllable vibration source is equipped with a vibration control system 4, an electro-hydraulic servo-controlled vibrator 5, a hydraulic servo system 6, a servo valve 7, and a reaction weight 8. The vibration control system 4 is connected to the electro-hydraulic servo-controlled vibrator 5, the hydraulic servo system 6, the servo valve 7, and the reaction weight 8. The vehicle-mounted controllable vibration source 1 is also equipped with a vertical linear vibration to horizontal rotation vibration conversion system 9 for converting vertical vibration signals and energy into clockwise or counterclockwise rotating vibration signals, and a scalar shear wave excited rigid disc-shaped metal vibrating plate 2 for performing clockwise or counterclockwise rotating vibration. At least one coupling tooth 3 is eccentrically provided on the bottom surface of the scalar shear wave excited rigid disc-shaped metal vibrating plate 2. The vertical linear vibration to horizontal rotation vibration conversion system 9 and the scalar shear wave excited rigid disc-shaped metal vibrating plate 2 are connected. Among them, the vibration control system 4 adopts a synchronous vibration control system, and the vertical linear vibration to horizontal rotational vibration conversion system 9 adopts an existing common arbitrary transmission mechanism that converts translational motion into rotational motion on the normal plane of the original translational direction, such as... Figure 4 The rack-and-pinion mechanism described herein connects the rack to the existing vertical vibration device on the vehicle-mounted controllable vibration source 1. The horizontally placed bevel gear is connected to and coaxially arranged with the scalar transverse wave excited rigid disc-shaped metal vibrating plate 2. When the vehicle-mounted controllable vibration source 1 drives the rack to move up and down, the rack, through a meshing spur gear, drives the vertically placed bevel gear connected to the spur gear on the same rotating shaft to rotate. The vertically placed bevel gear drives the meshing horizontally placed bevel gear to rotate, and the horizontally placed bevel gear drives the scalar transverse wave excited rigid disc-shaped metal vibrating plate 2 to rotate. This converts the translational motion (i.e., the rack) into rotational motion in the normal plane of the original translational direction. Its function is to enable the vertical linear vibration to horizontal rotational vibration conversion system to convert the vertical vibration signal and energy of the vehicle-mounted controllable vibration source into a clockwise or counterclockwise rotating vibration signal when the scalar transverse wave vibration source device is operating.

[0044] The vehicle-mounted controllable vibration source 1 is equipped with a vibration source start controller 10.

[0045] It also includes a ground scalar shear wave receiver 11 for real-time reception of scalar shear waves excited by the rotational vibration of the coupling tooth 3. The ground scalar shear wave receiver 11 is deployed and buried on the ground within the scalar shear wave seismic exploration area for the scalar shear wave source device (i.e., the vehicle-mounted controllable source 1) to operate, according to the construction design. The ground scalar shear wave receiver 11 is a sensor on a three-dimensional scalar shear wave signal receiving sensor network.

[0046] The coupling teeth 3 are uniformly distributed in a ring shape on the bottom surface of the rigid disc-shaped metal vibrating plate 2 excited by scalar transverse waves, and are concentric with the bottom surface of the plate.

[0047] The coupling teeth 3 are evenly distributed in two concentric rings on the bottom surface of the rigid disc-shaped metal vibrating plate 2 excited by scalar shear waves. The inner ring has eight coupling teeth 3 and the outer ring has eight coupling teeth 3.

[0048] The coupling tooth 3 is a cone-shaped structure with a gradually decreasing outer diameter toward the rigid disc-shaped metal vibrating plate 2 that is away from the scalar transverse wave excitation.

[0049] Figure 2 This is a top view of the bottom of the rigid disc-shaped metal vibrating plate and the annularly mounted coupling teeth of the present invention. Before construction, the weight of the vehicle-mounted controllable scalar wave source device is used to press the annularly mounted coupling teeth 3 below the bottom surface of the rigid disc-shaped metal vibrating plate 2 of the scalar wave source device below the ground, so that the scalar wave source device and the ground form a good coupling.

[0050] The vibration control system 4 is connected to the vibration source start controller 10 via a wired or wireless network.

[0051] When the source start controller 10 sends a positive trigger pulse signal, the vibration control system 4 drives the scalar shear wave source device to excite the rigid disc-shaped metal vibrating plate 2 to vibrate and rotate in a clockwise direction; when the source start controller 10 sends a negative trigger pulse signal, the vibration control system 4 drives the scalar shear wave source device to excite the rigid disc-shaped metal vibrating plate 2 to rotate and vibrate in a counterclockwise direction.

[0052] When the scalar shear wave source device excites the rigid disc-shaped metal vibrating plate 2 to vibrate and rotate in a clockwise or counterclockwise direction, it drives the coupling teeth 3, which are installed in a ring below the bottom surface of the rigid disc-shaped metal vibrating plate 2, to rotate and vibrate in a clockwise or counterclockwise direction, so that it produces a scalar shear wave that is parallel to the ground and rotates and polarizes in a clockwise or counterclockwise direction and propagates into the underground half-space.

[0053] like Figure 3 As shown, the scalar shear wave seismic data acquisition and processing method based on a vehicle-mounted controllable seismic source device includes the following steps:

[0054] S1. On the ground within the scalar shear wave seismic exploration area, a three-dimensional excitation network of scalar shear wave sources is deployed according to the construction design for the movement of vehicle-mounted controllable seismic sources.

[0055] S2. Two-dimensional scalar shear wave signal receiving sensor survey lines or three-dimensional scalar shear wave signal receiving sensor networks are laid out and buried on the ground in the scalar shear wave seismic exploration area according to the construction design. Ground scalar shear wave receiving devices 11 are installed on the two-dimensional scalar shear wave signal receiving sensor survey lines or three-dimensional scalar shear wave signal receiving sensor networks.

[0056] S3. Move the vehicle-mounted scalar shear wave source device to the scalar shear wave source point on the pre-designed scalar shear wave source three-dimensional excitation network, and then use the self-weight of the vehicle-mounted scalar shear wave source device to press the coupling teeth 3 installed in the ring below the bottom surface of the scalar shear wave excitation rigid disc-shaped metal vibration plate 2 of the scalar shear wave source device below the ground, so that the scalar shear wave source device and the ground form a good coupling.

[0057] S4. The vibration control system 4 sends a pulse to start receiving scalar shear wave signals. The pulse signal is transmitted to the source start controller 10 via a wired or wireless network, triggering the vehicle-mounted scalar shear wave source device to excite scalar shear wave signals that rotate and vibrate in a clockwise or counterclockwise direction.

[0058] S5. The three-dimensional scalar shear wave signal receiving sensor network, which is laid out and buried on the ground according to the construction design in the scalar shear wave seismic exploration area, receives the direct scalar shear wave excited by the vehicle-mounted scalar shear wave source device and the reflected scalar shear wave reflected back to the ground from the underground wave impedance interface under the control of the start pulse issued by the vibration control system 4.

[0059] S6. The vehicle-mounted scalar shear wave source device, following steps S3 to S5, sequentially excites two scalar shear wave signals with opposite rotation directions and parallel to the ground at each scalar shear wave source point location on the ground within the scalar shear wave seismic exploration area, in clockwise and counterclockwise directions. The ground scalar shear wave receiver 11 receives the direct scalar shear wave excited by the vehicle-mounted scalar shear wave source device and the reflected scalar shear wave reflected back to the ground from the underground wave impedance interface.

[0060] S7. Combine and merge the two direct and reflected scalar shear wave data that are excited sequentially by all scalar shear wave source points in opposite directions and parallel to the ground to form two scalar shear wave seismic data volumes rotating in two directions.

[0061] S8. The ground scalar shear wave receiving device 11, which is deployed on the ground in the scalar shear wave seismic exploration area, can record the upward scalar shear wave data generated by the downward scalar shear wave excited by the ground scalar shear wave source and reflected back to the ground at the interface of each wave impedance in the underground.

[0062] S9. Taking a scalar shear wave source point in the scalar shear wave seismic exploration area as the center, extract gather data from ground scalar shear wave receiving devices 11 at all azimuth angles of far, medium and near offsets at 5 to 10 degrees. Calculate the velocity of the direct scalar shear wave point by point based on the straight-line distance from the source center to each ground scalar shear wave receiving device 11 and the first arrival time of the direct scalar shear wave.

[0063] S10. Based on the velocity distribution values ​​of direct scalar shear waves in all directions of the scalar shear wave seismic exploration area calculated in step S9, determine the azimuth angles of the fastest and slowest direct scalar shear wave velocities in the exploration area.

[0064] S11. Based on the ratio of the fastest and slowest direct scalar shear wave velocities at different azimuth angles within the scalar shear wave seismic exploration area calculated in step S10, determine the scalar shear wave anisotropy coefficients at different azimuth angles within the exploration area.

[0065] S12. Based on the azimuth angles of the fastest and slowest direct scalar shear wave velocities within the work area determined in step S13, the scalar shear wave data volume calculated in step S10 is rotated to obtain the reflected scalar shear wave horizontal component data volume parallel to the direction of the fastest scalar shear wave velocity and the reflected scalar shear wave horizontal component data volume perpendicular to the direction of the fastest scalar shear wave velocity.

[0066] S13. Perform radiation-preserving imaging processing on the two sets of reflection scalar shear wave data volumes obtained in step S12, and combine the two sets of reflection scalar shear wave imaging data volumes to perform fine structural interpretation of underground geological bodies, including faults and fracture zones, fracture zones, and underground rock strata under the influence of underground principal stress, and to identify fractures and faults.

[0067] S14. Extract various attribute volumes sensitive to underground reservoir fluids from the two sets of reflection scalar shear wave radiation preservation imaging data obtained in step S12, and calibrate them using the attributes of the scalar shear wave seismic exploration area well acoustic logging data and the attributes of the reflection scalar shear wave radiation preservation imaging data. Then, based on the reservoir structure distribution interpreted by fine structure around the well, identify the reservoir fluid type and evaluate and predict the oil and gas saturation distribution.

[0068] S15. Extract the scalar shear wave amplitude, scalar shear wave reflection coefficient, scalar shear wave AVO characteristics, scalar shear wave bright spots (or dark spots), fast and slow scalar shear wave amplitude ratio, and scalar shear wave time-frequency characteristics from the two sets of reflection scalar shear wave amplitude preservation imaging data volumes in step S13; evaluate the morphology and characteristics of underground geological structures and the type and distribution range of fluids in pores.

[0069] S16. Extract the scalar shear wave attribute data from the two sets of reflection scalar shear wave radiation preservation imaging data volumes in step S13, and perform scalar shear wave waveform classification, obtain scalar shear wave coherence volume, scalar shear wave curvature volume, scalar shear wave tilt and azimuth volume, scalar shear wave coherence volume, and scalar shear wave curvature volume.

[0070] Using the scalar shear wave attribute data extracted in step S16, the scalar shear wave impedance (IS), elastic impedance (Ie), elastic impedance coefficient (Ce), scalar shear wave velocity ratio (γ0), scalar shear wave Poisson's ratio (σ), Lamé constant (λ), shear modulus (μ), scalar shear wave absorption coefficient (QS), scalar shear wave viscosity coefficient, scalar shear wave absorption coefficient ratio, and scalar shear wave frequency characteristics are calculated.

[0071] The two sets of reflection scalar shear wave radiation-preserving imaging data volumes were inverted and processed to extract relevant attributes. Fluid identification, prediction and evaluation were performed in underground geological bodies and underground rock pores, ultimately achieving comprehensive prediction, evaluation and quantitative interpretation of fluid distribution in oil and gas reservoirs.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Based on the technical essence of the present invention, any simple modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principles of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A scalar shear wave source device based on a vehicle-mounted controllable vibration source, comprising a vehicle-mounted controllable vibration source (1) capable of generating vertical vibration signals and energy, wherein the vehicle-mounted controllable vibration source (1) is equipped with a vibration control system (4), an electro-hydraulic servo-controlled vibrator (5), a hydraulic servo system (6), a servo valve (7), and a reaction weight (8), wherein the vibration control system (4) is connected to the electro-hydraulic servo-controlled vibrator (5), the hydraulic servo system (6), the servo valve (7), and the reaction weight (8), characterized in that... The vehicle-mounted controllable vibration source (1) is also equipped with a vertical linear vibration to horizontal rotation vibration conversion system (9) for converting vertical vibration signals and energy into vibration signals that rotate clockwise or counterclockwise, and a scalar transverse wave excited rigid disc-shaped metal vibration plate (2) for performing clockwise or counterclockwise rotation vibration. At least one coupling tooth (3) is eccentrically provided on the bottom surface of the scalar transverse wave excited rigid disc-shaped metal vibration plate (2). The vertical linear vibration to horizontal rotation vibration conversion system (9) and the scalar transverse wave excited rigid disc-shaped metal vibration plate (2) are connected. The vehicle-mounted controllable seismic source (1) is equipped with a seismic source start controller (10); it also includes a ground scalar shear wave receiving device (11) for receiving scalar shear waves excited by the rotational vibration of the coupling teeth (3) in real time. The ground scalar shear wave receiving device (11) is laid out and buried on the ground in the scalar shear wave seismic exploration area according to the construction design.

2. The scalar shear wave source device based on a vehicle-mounted controllable seismic source according to claim 1, characterized in that, The coupling teeth (3) are evenly distributed in a ring shape on the bottom surface of the rigid disc-shaped metal vibration plate (2) excited by scalar transverse waves, concentric with the bottom surface of the plate.

3. The scalar shear wave source device based on a vehicle-mounted controllable seismic source according to claim 2, characterized in that: The coupling teeth (3) are arranged in multiple rings, concentric with the bottom surface of the rigid disc-shaped metal vibration plate (2) excited by scalar transverse waves, and are uniformly distributed on the bottom surface of the rigid disc-shaped metal vibration plate (2).

4. The scalar shear wave source device based on a vehicle-mounted controllable seismic source according to claim 1, characterized in that: The coupling tooth (3) is conical in shape with its outer diameter gradually decreasing away from the rigid disc-shaped metal vibration plate (2) excited by the scalar transverse wave.

5. The scalar shear wave source device based on a vehicle-mounted controllable seismic source according to claim 1, characterized in that, The vibration control system (4) is connected to the vibration source start controller (10) via a wired or wireless network.

6. The scalar shear wave source device based on a vehicle-mounted controllable seismic source according to claim 1, characterized in that, When the source start controller (10) sends a positive trigger pulse signal, the vibration control system (4) drives the scalar shear wave source device to excite the rigid disc-shaped metal vibration plate (2) to vibrate and rotate in the clockwise direction; when the source start controller (10) sends a negative trigger pulse signal, the vibration control system (4) drives the scalar shear wave source device to excite the rigid disc-shaped metal vibration plate (2) to rotate and vibrate in the counterclockwise direction.

7. The scalar shear wave source device based on a vehicle-mounted controllable seismic source according to claim 1, characterized in that, When the scalar transverse wave source device excites the rigid disc-shaped metal vibrating plate (2) to vibrate and rotate in a clockwise or counterclockwise direction, it drives the coupling teeth (3) installed in a ring below the bottom surface of the rigid disc-shaped metal vibrating plate (2) to rotate and vibrate in a clockwise or counterclockwise direction, so that it produces a scalar transverse wave that is parallel to the ground and rotates and polarizes in a clockwise or counterclockwise direction and propagates into the underground space.

8. The scalar shear wave seismic data acquisition and processing method based on a vehicle-mounted controllable seismic source device according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. On the ground within the scalar shear wave seismic exploration area, a two-dimensional excitation line or a three-dimensional excitation network of the scalar shear wave source is laid out according to the construction design for the movement of the vehicle-mounted controllable seismic source (1). S2. Two-dimensional scalar shear wave signal receiving sensor survey lines or three-dimensional scalar shear wave signal receiving sensor networks are laid out on the ground in accordance with the construction design within the scalar shear wave seismic exploration area. Ground scalar shear wave receiving devices (11) are buried on the two-dimensional scalar shear wave signal receiving sensor survey lines or three-dimensional scalar shear wave signal receiving sensor networks. S3. Move the vehicle-mounted scalar shear wave source device to the scalar shear wave source point on the pre-designed scalar shear wave source two-dimensional excitation line or three-dimensional excitation network, and then use the self-weight of the vehicle-mounted scalar shear wave source device to press the coupling teeth (3) installed in the ring below the bottom surface of the scalar shear wave excitation rigid disc-shaped metal vibration plate (2) of the scalar shear wave source device below the ground, so that the scalar shear wave source device and the ground form a good coupling. S4. The vibration control system (4) sends a pulse to start and begin receiving scalar shear wave signals. The pulse signal is transmitted to the source start controller (10) via a wired or wireless network, triggering the vehicle-mounted scalar shear wave source device to excite scalar shear wave signals that rotate and vibrate in a clockwise or counterclockwise direction, so that the scalar shear wave excites the rigid disc-shaped metal vibration plate (2) to rotate and vibrate in a clockwise or counterclockwise direction. S5. The two-dimensional scalar shear wave signal receiving sensor survey line or three-dimensional scalar shear wave signal receiving sensor network, which are laid out and buried on the ground according to the construction design in the scalar shear wave seismic exploration area, receive the direct scalar shear wave excited by the vehicle-mounted scalar shear wave source device and the reflected scalar shear wave reflected back to the ground from the underground wave impedance interface under the control of the start pulse issued by the vibration control system (4). S6. The vehicle-mounted scalar shear wave source device, following steps S3 to S5, sequentially excites two scalar shear wave signals with opposite rotation directions and parallel to the ground at each scalar shear wave source point on the ground within the scalar shear wave seismic exploration area in clockwise and counterclockwise directions. The ground scalar shear wave receiver (11) receives the direct scalar shear wave excited by the vehicle-mounted scalar shear wave source device and the reflected scalar shear wave reflected back to the ground from the underground wave impedance interface. S7. Combine and merge the two direct and reflected scalar shear wave data that are excited sequentially by all scalar shear wave source points in opposite directions and parallel to the ground to form two scalar shear wave seismic data volumes rotating in two directions. S8. The ground scalar shear wave receiving device (11) deployed on the ground in the scalar shear wave seismic exploration area records the upward reflection of the downward scalar shear wave generated by the ground scalar shear wave source at the interface of each wave impedance in the underground and returns to the ground. S9. Taking a scalar shear wave source point in the scalar shear wave seismic exploration area as the center, extract gather data from all ground scalar shear wave receiving devices (11) with far, medium and near azimuth offsets at 5 to 10 degrees. Calculate the velocity of the direct scalar shear wave point by point based on the straight distance from the source center to each ground scalar shear wave receiving device (11) and the first arrival time of the direct scalar shear wave. S10. Based on the velocity distribution values ​​of direct scalar shear waves in all directions of the seismic exploration area calculated in step S9, determine the azimuth angles of the fastest and slowest direct scalar shear wave velocities in the exploration area. S11. Based on the ratio of the fastest and slowest direct scalar shear wave velocities at different azimuth angles within the scalar shear wave seismic exploration area calculated in step S10, determine the scalar shear wave anisotropy coefficients at different azimuth angles within the exploration area. S12. Based on the azimuth angles of the fastest and slowest direct scalar shear wave velocities within the work area determined in step S13, the scalar shear wave data volume calculated in step S10 is rotated to obtain the reflected scalar shear wave horizontal component data volume parallel to the direction of the fastest scalar shear wave velocity and the reflected scalar shear wave horizontal component data volume perpendicular to the direction of the fastest scalar shear wave velocity. S13. Perform radiation-preserving imaging processing on the two sets of reflection scalar shear wave data volumes obtained in step S12, and combine the two sets of reflection scalar shear wave radiation-preserving imaging data volumes to perform fine structural interpretation of underground geological bodies and identification of fractures and faults. S14. Extract various attribute volumes sensitive to underground reservoir fluids from the two sets of reflection scalar shear wave radiation-preserving imaging data obtained in step S12. Then, calibrate the data using the attributes of the scalar shear wave seismic logging data in the well within the exploration area and the attributes of the reflection scalar shear wave radiation-preserving imaging data. Finally, identify the reservoir fluid type and evaluate and predict the oil and gas saturation distribution around the well based on the reservoir structure distribution interpreted by the fine structure interpretation.

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