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Seismic wave velocity inversion method and device

A velocity inversion and seismic wave technology, applied in the field of seismic exploration, can solve the problems of inaccurate velocity data, poor accuracy of seismic waves, and affecting the effect of seismic tomography, achieving the effect of improving resolution and high accuracy

Active Publication Date: 2019-02-19
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the optimized velocity model of seismic waves obtained by the above method has multiple solutions, which leads to inaccurate velocity data and affects the effect of seismic tomography
[0004] In view of the poor accuracy of the above seismic wave velocity inversion method, no effective solution has been proposed

Method used

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  • Seismic wave velocity inversion method and device
  • Seismic wave velocity inversion method and device
  • Seismic wave velocity inversion method and device

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Embodiment 1

[0030] see figure 1 A flow chart of a seismic wave velocity inversion method shown, the method includes the following steps:

[0031] Step S102, acquiring surface seismic wave data in a preset geological area; wherein, the surface seismic wave data includes shear wave data and longitudinal wave data;

[0032] Generally, seismic waves are vibrations that propagate from the seismic source to all directions, and refer to elastic waves that are generated from the seismic source and radiate to the surroundings. Seismic waves can be divided into three types according to the propagation mode: longitudinal waves (also called P waves), transverse waves (also called S waves) and surface waves (L waves); among them, both longitudinal waves and transverse waves belong to body waves. When an earthquake occurs, the medium in the source area ruptures and moves rapidly. This disturbance constitutes a wave source. Due to the continuity of the earth's medium, the fluctuation propagates to the ...

Embodiment 2

[0067] Corresponding to the above method embodiment, see Figure 4 A structural schematic diagram of a seismic wave velocity inversion device shown, the device includes the following parts:

[0068] A seismic wave data acquisition module 402, configured to acquire seismic wave data of the surface in a preset geological region; wherein, the seismic wave data of the surface includes shear wave data and longitudinal wave data;

[0069] The pre-stack depth migration processing module 404 is configured to use the initial velocity model to perform pre-stack depth migration processing on the seismic wave data to generate a common imaging point gather of seismic waves; wherein, the initial velocity model is based on historical seismic wave data and historical seismic wave velocity The corresponding relationship is established;

[0070] The remaining depth data extraction module 406 is used to extract the remaining depth data of the event from the common imaging point gather; wherein,...

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Abstract

The invention provides a seismic wave speed inversion method and device; the method comprises the following steps: obtaining earth surface seismic wave data in a preset geological area, wherein the earth surface seismic wave data comprises transverse wave data and longitudinal wave data; using an initial speed model to carry out prestack depth migration treatment for the seismic wave data, thus forming a seismic wave Common Imaging Gather (CIG); extracting cophasal axes residual depth data from the CIG, wherein the residual depth data comprises a seismic wave residual depth correcting value and a reflection interface position; reversing the seismic wave data of underground medium in the geological area according to the residual depth data, wherein the underground medium seismic wave data comprises the transverse wave speed, the longitudinal wave speed and anisotropy parameters. The seismic wave speed inversion method can accurately obtain the seismic wave data, thus improving the earthquake imaging resolution.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a seismic wave velocity inversion method and device. Background technique [0002] With the development of oil and gas field exploration and development technology and the improvement of computer software and hardware, pre-stack depth migration (PSDM) has gradually become a key technology for high-resolution seismic processing in complex structural areas. In PSDM, the inaccurate calculation of seismic wave velocity will have obvious adverse effects on subsequent imaging and interpretation. Therefore, it is of great theoretical significance and practical value to study velocity analysis and inversion methods suitable for PSDM. [0003] In the prior art, PSDM guided tomography based on ray theory develops towards migration velocity analysis. These methods include updating velocities by solving interlayer velocity gradients with interpreted horizons as constraints; and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/28G01V1/303
Inventor 于彩霞王彦飞
Owner BC P INC CHINA NAT PETROLEUM CORP