Coherence enhancement processing method used for recognizing fault

Abstract

A coherence enhancement processing method used for recognizing a fault includes the steps that the round-trip reflection time range of an objective interval on a seismic data body is determined, and structure guiding filtering and coherent computation are carried out on original seismic data corresponding to the objective interval to obtain a structure guiding filtering eigenvalue coherent data body; reflection strength alternating component computation is carried out on the data body to obtain an alternating component data body, and positive and negative exchange is carried out on the data body to obtain a coherent reflection strength alternating component data body with positive values and negative values exchanged; data body zero-setting computation is carried out on the data body, and low-coherence positive values behaving as the fault are all retained to obtain a positive value data body; ant tracking computation is carried out on the positive value data body of coherent reflection strength alternating components to obtain an ant tracking data body; the ant tracking data body and an original seism are fused to generate a fused data body; the position data explained on the original seismic data body are used for extracting horizon slices from the fused data body, and a fault and original seism planar graph is obtained.

Description

technical field [0001] The invention relates to a geophysical prospecting method, which is a coherent enhancement processing method for identifying faults. Background technique [0002] Coherence is an effective geophysical method for identifying faults. The current coherence methods include trace correlation coherence, variance, similarity coherence, eigenvalue coherence and other coherence methods. However, no matter what kind of coherent method, in the case of poor quality seismic data, it cannot obtain ideal results. In order to highlight the coherence effect, some coherence enhancement methods are currently popular, including post-stack processing of seismic data before coherence calculation, including dominant frequency band filtering, structure-guided filtering, etc. Although the coherence has been enhanced, sometimes the effect is still not ideal. At present, there is still a method of data processing after coherence, including ant tracking on coherent data bodies, ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned problems, the purpose of the present invention is to provide a processing method for coherence enhancement for identifying faults, thereby effectively solving the above-mentioned problem of poor seismic data quality

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