A method and device for identifying the boundary of a geological body

Abstract

The present invention provides a geological body boundary identification method and device. The geological body boundary identification method includes: setting a sliding window whose length L is 2M+1, and setting the step value of the length L to N, and obtaining 2M+1 sampling points , and calculate the Gaussian window function G(n) according to 2M+1 sampling points; use the dip angle scanning method to determine the best dip pair of the local reflection interface where each sampling point is located; take each sampling point as an analysis sample point, and Take the analysis sample point as the center, read the amplitude values ​​of 2M+1 points from multiple directions according to the apparent dip angle of the analysis sample point, and generate multiple seismic signal sequences Sk(n),k=1,2,... ., i, n=0,1,...,2M, i=2M+1; calculate new earthquake sequence GSk(n) according to seismic signal sequence Sk(n) and Gaussian window function G(n); calculate new earthquake The generalized Hilbert transform value GHk of the sequence GSk(n); generate the boundary detection value of the analysis sample point according to the generalized Hilbert transformation value GHk; generate a data volume according to a plurality of boundary detection values, and perform an algorithm on the data volume Layer slice analysis to identify geological body boundaries.

Description

technical field [0001] The present invention relates to the interpretation technology of petroleum geophysical exploration seismic data, in particular, relates to a geological body boundary identification method and device capable of identifying small-scale geological body boundaries. Background technique [0002] At present, coherent technology is widely used to detect river channels and faults. Although coherent technology has gone through three generations of development, they all have averaging effects, making it difficult to highlight narrow channels and small faults. At the same time, the coherence algorithm is sensitive to noise. At the intersection of river channels and faults, the seismic signals are cluttered and the noise is strong. It is difficult for coherent technology to accurately identify narrow river channels and small faults, but only the roughly developed areas of river channels and faults. [0003] The existing generalized Hilbert transform boundary det...

AI Technical Summary

Problems solved by technology

However, the trend of the actual geological body (river channel, fault) is often complex in space, and only the boundary detection of the two directions of the main survey line and the contact survey line cannot comprehensively detect the boundary of the geological body

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