High-efficient time-frequency spectrum decomposition of seismic data based on generalized S transform
Chen Xue-hua1,2, He Zhen-hua2, Huang De-ji1
1. College of Information Engineering,Chengdu University of Technology,Chengdu City,Sichuan Province, 610059,China;
2. State Key Lab of Oil and Gas Reservoir Geology and Exploration,Chengdu University of Technology,Chengdu City,Sichuan Province, 610059,China
Abstract：Common-used spectral decomposition method made the time-frequency resolution cannot be variation because of fixed window; several common-spectral data volumes generated from spectral decomposition not only occupied a great deal of storage resource, but also made the interpretation become workload. In order to overcome these two problems, a generalized S transform is constructed, in which the wavelet function can be adjusted and the temporal width can be adjusted and analyzed adaptively according to the frequency of seismic signal. It is discovered by studying the time-frequency response in generalized S transform domain for several top and bottom reflectivity combinations of reservoir that the frequency position appearing amplitude extreme is directly correlative with the thickness of reservoir and the sign of reflectivity, which is used to present the method of high-efficient time-frequency spectral decomposition of seismic data based on generalized S transform. The method extracts the frequency data with maximum amplitude from several post-spectral-decomposition common frequency data volume to synthesize a data volume with maximum spectrum, reducing the data storage volume and improving S/N ratio. The method is used to analyze the lithology, geologic structure and spatial distribution of sand body reservoir in practical data processing, achieving good results.
陈学华, 贺振华, 黄德济. 基于广义S变换的地震资料高效时频谱分解[J]. 石油地球物理勘探, 2008, 43(5): 530-534.
Chen Xue-hua, He Zhen-hua, Huang De-ji. High-efficient time-frequency spectrum decomposition of seismic data based on generalized S transform. OGP, 2008, 43(5): 530-534.
