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PS wave seismic data migration imaging method and system under complex surface conditions

A complex surface and migration imaging technology, applied in the field of seismic exploration, to achieve the effect of accurate correction

Pending Publication Date: 2021-02-19
CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a PS wave seismic data migration imaging method and system under complex surface conditions, to effectively solve the problem of accurate imaging of PS wave seismic records under complex surface conditions, and to obtain high-precision PS wave stacking under complex surface conditions. Front Depth Migration Imaging Section

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  • PS wave seismic data migration imaging method and system under complex surface conditions
  • PS wave seismic data migration imaging method and system under complex surface conditions
  • PS wave seismic data migration imaging method and system under complex surface conditions

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Embodiment 1

[0094] figure 2 It is a schematic diagram of the horizontal interface model of the undulating surface provided by the present invention. The surface undulation of the model is shown in the figure. The model grid is 201×201, and the vertical and horizontal grid spacing is 10m. There is a horizontal interface at the depth of 1000m in the model, the P-wave and S-wave velocities of the first layer medium of the model are 2000m / s and 1150m / s respectively, and the P-wave and S-wave velocities of the second layer medium are 3000m / s and 1730m respectively / s. A single explosion source is set in the middle of the horizontal direction of the undulating surface of this model, and the elastic wave finite difference forward modeling method suitable for complex surfaces is used for simulation figure 2 In the single-shot elastic wave seismic records of the model shown, the source wavelet is a Ricker wavelet with a main frequency of 30 Hz, the sampling time of seismic records is set to 2 s...

Embodiment 2

[0096] Figure 5 It is a schematic diagram of the undulating surface depression model provided by the present invention, and the surface form and underground medium structure of the model are as follows: Figure 5 As shown, the model grid is 401×301, and the vertical and horizontal grid spacing is 10m. In the model, the P-wave velocities of each layer from top to bottom are 2500m / s, 3000m / s, and 3500m / s respectively, and the S-wave velocities are 1450m / s, 1730m / s, and 2020m / s respectively. Simulation by Elastic Wave Finite-Difference Forward Modeling Applicable to Complex Surface Figure 5 The elastic wave seismic records of the undulating surface depression model are shown. 79 explosion sources are set on the undulating surface of the model. The shot spacing is 50m. The source wavelet is the Ricker wavelet with a main frequency of 30Hz. The spacing is 10m. Figure 6 yes Figure 5 The schematic diagram of the multi-shot superimposed PS wave prestack depth migration section...

Embodiment 3

[0098] Figure 7 is a schematic diagram of the undulating surface Marmousi-2 model provided by the present invention, wherein Figure 7 (a) is a schematic diagram of the P-wave velocity model, Figure 7 (b) is a schematic diagram of the S-wave velocity model. The model grid is 1311×286, and the vertical and horizontal grid spacing is 20m. 87 explosion sources are set on the undulating surface of this model, with a shot spacing of 300m. The source wavelet is a Ricker wavelet with a main frequency of 10Hz. Each shot receives 321 channels with a channel spacing of 20m. Figure 8 yes Figure 7 Schematic diagram of the multi-shot superimposed PS wave prestack depth migration section of the Marmousi-2 model of the undulating surface shown, where Figure 8 (a) is the migration profile obtained by using the conventional complex surface Gaussian beam migration method based on local tilt stacking, Figure 8 (b) is the offset profile obtained using the present invention. From Fig...

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Abstract

The invention relates to a PS wave seismic data migration imaging method and system under complex surface conditions. The invention includes: obtaining a P-wave ray beam emitted from the position of the complex surface seismic source based on P-wave kinematics and dynamic ray tracing, and directly performing P-wave field continuation on the complex surface seismic source; utilizing corresponding S-wave ray tracing to obtain an S-wave ray beam emitted from the position of a complex ground surface detection point, and directly performing reverse continuation on each shot of PS-wave seismic record at the complex ground surface detection point to obtain an accurate reverse continuation wave field of the complex ground surface; performing cross-correlation imaging on the P wave field at the complex surface seismic source corresponding to each shot of PS wave and the reverse continuation wave field at the complex surface detection point to obtain a depth domain migration profile of each shotof PS wave of the complex surface; and superposing the imaging values of all the single-shot PS waves at the same imaging point position to obtain a final complex surface PS wave high-precision depthdomain migration imaging profile. The method can effectively solve the problem of accurate imaging of PS wave seismic records under complex surface conditions.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a PS wave seismic data migration imaging method and system under complex surface conditions. Background technique [0002] Seismic wave energy propagates in the underground medium as elastic waves, including longitudinal (P) waves and transverse (S) waves. The two wave types reflect the different characteristics of the properties of the underground medium. The joint P wave and S wave seismic wave field can be obtained better than the single P wave More subsurface media information. For the subsurface gas cloud area, better imaging results can be obtained by using PS wave seismic data than PP wave. In addition, PS waves can obtain more detailed imaging of shallow structures and small faults, and make full use of underground wave fields to obtain more detailed information on geological structures, internal deformations, and rock properties, thereby improving the identification o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36G01V1/34G01V1/28G01V1/30
CPCG01V1/36G01V1/362G01V1/345G01V1/28G01V1/301G01V2210/512G01V2210/64G01V2210/74
Inventor 韩建光吕庆田严加永
Owner CHINESE ACAD OF GEOLOGICAL SCI