Seismic attribute change rate calculation method based on spatial structure guidance

Abstract

The invention discloses a seismic attribute change rate calculation method based on spatial structure guidance. The method comprises steps: a three-dimensional seismic data body is inputted to calculate a seismic attribute body; the seismic attribute is subjected to horizontal slicing for spatial structure guidance scanning; the gradient vector of each orthogonal direction group is calculated; themodulus of each gradient vector is calculated; the gradient vector modulus calculated in the fourth step is subjected to statistical analysis; according to a statistical analysis result in the fifthstep, a final seismic attribute change rate is calculated; and the whole seismic attribute body finishes calculation, a final attribute change rate data body is obtained. The seismic attribute changerate calculation method based on spatial structure guidance has the beneficial effects that all possible orthogonal differential directions in the case of gradient vector calculation are considered, the attribute change rate calculated by the gradient vector of each orthogonal direction group is subjected to statistical analysis, the final seismic attribute change rate is calculated according to the statistical analysis result, influences on seismic attribute change rate calculation by noise caused by various reasons can be reduced, and the accuracy of using the seismic attribute for construction and lithologic interpretation is improved.

Description

technical field [0001] The invention relates to the technical field of structure and lithology interpretation using seismic attribute bodies, in particular to a method for calculating seismic attribute change rates based on spatial structure guidance. Background technique [0002] At present, the amount of offshore oil and gas resources accounts for about 30% of the global oil and gas resources, and the exploration and development of offshore oil and gas resources is very important. my country's marine oil and gas resources are mainly distributed in the Bohai Sea, especially the fluvial facies sand bodies in the Neogene of Minghuazhen Formation in Bonan and Bozhong, which are important oil and gas reservoirs in various oil and gas fields in the Bohai Sea. However, the most important channel sand bodies in the fluvial sand body reservoirs in the Bohai Sea Basin are thin, superimposed and intersected with each other, forming a complex discontinuity system. The distribution an...

AI Technical Summary

Problems solved by technology

First of all, when extracting seismic attributes, the noise in seismic data will inevitably affect the accuracy of attribute extraction

Secondly, the attribute change rate is calculated on the basis of seismic attributes. The mathematical basis is gradient analysis. In the actual implementation, finite difference is used to amplify the influence of noise in seismic data again, which greatly increases the uncertainty in the interpretation of seismic attribute change rate.

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