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Orthogonal anisotropic medium OVT domain imaging gather extraction method and system

An orthotropic, imaging gather technology, applied in seismic signal processing, etc., can solve the problem of extracting unresearched

Active Publication Date: 2021-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

For more complex media such as orthotropic media, the extraction of imaging gathers in the OVT domain has not yet been studied

Method used

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  • Orthogonal anisotropic medium OVT domain imaging gather extraction method and system
  • Orthogonal anisotropic medium OVT domain imaging gather extraction method and system
  • Orthogonal anisotropic medium OVT domain imaging gather extraction method and system

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0039] Such as figure 1 As shown, the present invention provides a method for extracting an orthotropic medium OVT domain imaging gather, including:

[0040] S1. Calculate the travel time field information of the orthotropic medium;

[0041] Before executing step S1, first input the data, the data includes the orthotropic parameter model (V P0 ,ε 1 ,ε 2 ,δ 1 ,δ 2 ,δ 3 ), as well as the preprocessed common midpoint (CMP) gather data, as well as the acquisition system parameters required for ray tracing and migration imaging, such as depth information, offset distance, azimuth angle and other parameters.

[0042] Orthotropic medium ray tracing method is used to calculate the travel time information of each shot point one by one. At each grid, the wave field extrapolation method is used to calculate the travel time information of adjacent grids, and all shot point...

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Abstract

The invention provides an orthogonal anisotropic medium OVT domain imaging gather extraction method and system. The method comprises the steps of S1, calculating travel time field information of an orthogonal anisotropic medium; S2, performing shot-by-shot extrapolation on the seismic wave field according to the travel time field information to obtain an imaging result; S3, extracting an orthotropic OVT domain imaging gather through the imaging result. The system comprises a calculation module used for calculating travel time field information of an orthotropic medium; an imaging module used for carrying out shot-by-shot extrapolation on the seismic wave field according to the travel time field information to obtain an imaging result; and an extraction module used for extracting an orthotropic OVT domain imaging gather through the imaging result. According to the invention, a high-quality and information-rich imaging gather is provided for velocity analysis and reservoir description, and the precision of velocity analysis and reservoir description is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of anisotropic medium seismic imaging in oil and gas exploration and development, and specifically relates to a method and system for extracting orthotropic medium OVT domain imaging gathers. Background technique [0002] Seismic imaging technology in isotropic media is relatively mature, and various advanced imaging methods and gather extraction methods have achieved good results, including reverse time migration (RTM) imaging method and OVT domain imaging gather extraction method, etc. Among them, the OVT domain imaging gather extraction method is also called the five-dimensional space imaging gather extraction method, which means that the gather information includes three coordinates of the three-dimensional Cartesian coordinate system, as well as offset and azimuth. However, the OVT domain imaging gather extraction method based on isotropic media is relatively mature, and the extraction method based on a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 杨勤勇郭恺
Owner CHINA PETROLEUM & CHEM CORP