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Method for achieving direct output of OVG gather through integral method imaging

An integral method and imaging technology, applied in the field of seismic exploration data processing and interpretation, to achieve the effects of improving computing efficiency, reducing memory requirements, and reducing the pressure on storage requirements

Pending Publication Date: 2022-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, there is no imaging method that can use conventional preprocessed CMP gathers as the basic data required for imaging, and directly migrate to obtain OVG gathers

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  • Method for achieving direct output of OVG gather through integral method imaging
  • Method for achieving direct output of OVG gather through integral method imaging
  • Method for achieving direct output of OVG gather through integral method imaging

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Embodiment Construction

[0038] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0039] The integral method imaging of the present invention realizes the method for direct output of OVG gathers and comprises the following steps:

[0040] Step 1. Obtain parameters for offset calculation, including offset aperture, imaging target line range, imaging time or depth sampling information, number of calculation processes, etc.;

[0041] Step 2: Obtain the required preprocessed CMP gathers according to the position of the imaging target line and the offset aperture. Then, calculate the line range of the acquired input CMP data according to the offset aperture and the data line spacing after imaging:

[0042]

[0043] Among them, N line Indicates the line range of the CMP gather data to be obtained, L apt Calculated aperture for offse...

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Abstract

The invention provides a method for achieving direct output of an OVG gather through integral method imaging. The method for achieving direct output of the OVG gather through integral method imaging comprises the steps: step 1, obtaining parameters of offset calculation; step 2, acquiring a required preprocessed CMP gather according to an imaging target line position and a migration aperture; step 3, equally dividing the obtained CMP gather data to each process according to the number of processes participating in calculation; step 4, reading a velocity field required by offset; step 5, calculating a travel time field required by imaging of the target line; step 6, calculating OVG imaging output parameter information corresponding to the current input seismic channel; step 7, outputting an OVG gather of the imaging target line; and step 8, circularly calculating the next imaging target line. According to the method for realizing direct output of the OVG gather through integral imaging, the read-write amount of seismic data and the disk occupation amount before and after imaging are greatly reduced, and the method has very good adaptability to high-density seismic data.

Description

technical field [0001] The invention relates to the technical field of seismic exploration data processing and interpretation, in particular to a method for realizing direct output of OVG gathers by integral method imaging. Background technique [0002] The Kirchhoff integral migration imaging method is currently the most mainstream imaging technology in seismic exploration. Kirchhoff integration prestack migration usually outputs offset domain imaging gathers, and has become a necessary routine processing procedure in seismic data processing. With the emergence of high-density seismic acquisition, the OVG (Offset Vector Gather) imaging gather generated by Kirchhoff integral migration can be better used for tomographic velocity inversion, improving the quality of migration velocity model and seismic imaging; Pre-property inversion and analysis to improve oil and gas prediction accuracy. However, there is still a lot of pressure to output OVG gathers under the current compu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/36G01V2210/512
Inventor 王延光唐祥功王常波尚新民芮拥军隆文韬张猛王蓬
Owner CHINA PETROLEUM & CHEM CORP