Seismic data optimization method and system for high-precision seismic coherence attributes

Abstract

The invention provides a seismic data optimization method and system for high-precision seismic coherence attributes, and belongs to the field of oil and gas geophysical exploration. According to theseismic data optimization method for the high-precision seismic coherence attributes, convolution is carried out by using a Gaussian function envelope surface and an instantaneous phase attribute bodyto obtain optimized seismic data, and then the coherence attributes of the optimized seismic data is extracted. According to the method, coherent algorithm characteristics are utilized, for low-quality seismic data, a Gaussian function envelope surface is adopted to replace original wavelets, noise interference is reduced, and the original data is converted into optimized data suitable for fracture research through a third-generation coherent algorithm. After seismic data is optimized, intrinsic value coherent attribute extraction is carried out, and fracture characteristics can be highlighted more effectively.

Description

technical field [0001] The invention belongs to the field of oil and gas geophysical exploration, and in particular relates to a seismic data optimization method and system for high-precision seismic coherence attributes. Background technique [0002] Coherent volume technology has become one of the most widely used techniques in seismic exploration, and coherent volume technology can describe the morphological characteristics of faults well. The coherence algorithm has undergone several important evolutions. The second-generation coherent volume technology realizes the multi-channel similar algorithm, and incorporates factors such as amplitude, waveform, and polarity into the method to realize the selection of the optimal apparent inclination angle of the coherence value. The second-generation algorithm improves stability and anti-forge, but reduces resolution. The third-generation coherence is based on the eigenvalue calculation of the covariance matrix, and the resolutio...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the above-mentioned prior art that the precision of conventional coherence attributes is low and cannot effectively meet the current high-precision seismic interpretation requirements, and to provide a seismic data optimization method and system for high-precision seismic coherence attributes. On the basis of the third-generation coherent algorithm, a fault-enhanced seismic data optimization method is proposed. This method is based on the instantaneous attributes of the earthquake. By applying the instantaneous phase attribute characteristics as the basis of the data construction method, the optimized data with stronger fault characteristics can be obtained, and further Combined with the third-generation coherent algorithm, the results of fault identification based on coherent attributes are optimized under complex geological conditions

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