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Method and device for extracting common imaging point gathers in angle domain

A common imaging point gather and extraction method technology, applied in the field of angle domain common imaging point gather extraction device, can solve the problems of strong low-frequency background noise, amplitude infidelity, insufficient velocity analysis tools, etc., and achieve the goal of improving calculation efficiency Effect

Active Publication Date: 2020-09-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The inventor found that while reverse time migration technology is developing rapidly, it still needs to face difficulties such as strong low-frequency background noise, insufficient velocity analysis tools, and unreliable amplitude.

Method used

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  • Method and device for extracting common imaging point gathers in angle domain
  • Method and device for extracting common imaging point gathers in angle domain
  • Method and device for extracting common imaging point gathers in angle domain

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Embodiment Construction

[0025] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0026] Firstly, the existing technology of angle domain common imaging point gather extraction method is introduced, the process is as follows figure 1 shown, including the following steps:

[0027] Step 1: Perform 3D Fourier transform on the wave field at the current moment.

[0028] The spatial wave field undergoes Fourier transform sequentially in three dimensions. This step converts the wave field from the space domain to the wave number domain, and obtains the wave field energy...

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Abstract

The present invention discloses an angle domain common image gather extraction method and device. The method comprises the following steps: calculating a wave field propagation angle at a current moment; calculating a wave number range according to the propagation angle; calculating an amplitude-preserved wave field energy value according to the wave number range; and determining an imaging angleposition based on the propagation angle, employing the wave field energy value to perform coherent imaging and outputting an imaging result to the angle domain common image gather. The angle domain common image gather extraction method and device calculate a wave field propagation angle through adoption of the regularization Poynting vector method to realize effective and rapid angle domain commonimage gather extraction aiming at the reverse time migration algorithm.

Description

technical field [0001] The present invention relates to the field of geological survey, and more specifically, to a method for extracting a common imaging point gather in an angle domain and a device for extracting a common imaging point gather in an angle domain. Background technique [0002] my country's oil exploration is faced with many problems such as complex surface, complex structure, and complex genesis. Among them, prestack depth migration imaging technology is still the basis for solving these problems. [0003] At present, the most accurate imaging method in theory is the reverse time migration method. This method directly solves the wave equation, has no propagation angle limitation, and can image folded waves and multiple waves. This method can still be accurate when the velocity changes drastically. Imaging, and has been developed as a depth imaging method for anisotropic (VTI, TTI) media. In 2007, after GPU (Graphic Processing Unit) appeared in the field of...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 李博张慧宇白英哲许璐
Owner CHINA PETROLEUM & CHEM CORP