Method and system for obtaining common offset common azimuth-domain gather

Abstract

The present invention provides a method and system for obtaining a common offset common azimuth-domain gather. The method comprises the following steps that: seismic data are sorted into n*m cross array domain gathers; each crosswise-arrangement domain gather is divided into common offset common azimuth-domain units according to a half-reduced shot line distance and a half-reduced wave detection line distance; common offset common azimuth-domain gather units are obtained with the center of the crosswise-arrangement domain gather adopted as a center according to a principle that every four adjacent common offset common azimuth-domain units are merged into one common offset common azimuth-domain gather unit; and the common offset common azimuth-domain gather units are sequentially numbered according to a sequence; and common offset common azimuth-domain gather units having the same serial numbers in all the crosswise-arrangement domain gathers are collected, so that the common offset common azimuth-domain gather can be obtained. With the method and system of the invention adopted, the offset range of the common offset common azimuth-domain gather can be decreased, the discontinuity of offset distribution can be decreased, and transition between gathers is smoother.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration seismic data processing, in particular to a method and system for obtaining common offset and common azimuth domain gathers. Background technique [0002] Compared with conventional seismic data, the distribution of azimuth angle and offset of wide-azimuth high-density seismic acquisition data is wider and more uniform. How to fully excavate and utilize the massive high-quality wide-azimuth seismic information contained in the wide-azimuth high-density seismic acquisition data is a realistic issue for seismic data processing. In recent years, the Common Offset Common Azimuth (COCA) technology has developed rapidly. The COCA technology industry is also called Offset Vector Tile (OVT) technology or common offset. Common Offset Vector (COV for short) technology and COCA technology provide the basis for maximizing the use of pre-stack offset and azimuth angle information. This technolo...

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Problems solved by technology

[0004] According to the above method, the obtained common-offset and common-azimuth domain gathers have a large offset range, which is usually about twice the shot line distance or receiver line distance. There is a jump in the offset transition between the shot line and the receiver line, especially the offset range of the common offset common azimuth domain gather around the intersection of the shot line and the receiver line is very large, which will bring a strong acquisition to the final result data volume footprint, not conducive to shallow imaging

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