Seismic signal resolution enhancement method based on time-frequency domain energy adaptive weighting

A resolution-enhancing, energy-adaptive technology, applied in seismic signal processing, etc., can solve problems such as data uncertainty, reflection event narrowing, reflection waveform time reduction, etc., to suppress wavelet sidelobes and reduce Event Artifacts, Effects of Resolution Enhancement

Active Publication Date: 2014-12-10
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0004] Due to the complex underground geological conditions, large lateral changes in the strata, the dispersion and attenuation of seismic wavelets, and the influence of seismic tuning and other factors, the time-varying and space-varying characteristics of seismic wavelets themselves simply increase the dominant frequency of seismic wavelets or Although the method of expanding the seismic frequency band can narro

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  • Seismic signal resolution enhancement method based on time-frequency domain energy adaptive weighting
  • Seismic signal resolution enhancement method based on time-frequency domain energy adaptive weighting
  • Seismic signal resolution enhancement method based on time-frequency domain energy adaptive weighting

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[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] The seismic signal resolution enhancement method based on time-frequency domain energy adaptive weighting of the present invention comprises the following steps:

[0021] 1. Input the 3D post-stack seismic data volume.

[0022] 2. Use the generalized S-transform to calculate the time-frequency distribution of the channel-by-channel seismic signals of the 3D post-stack seismic data volume, and calculate the amplitude of the time-spectrum and the envelope of the amplitude of the instantaneous spectrum. The specific process is:

[0023] Assuming that a seismic signal in the 3D seismic data volume is x(t), the formula of time-spectrum decomposition based on generalized S-transform is as follows:

[0024] TFR ( t , f ) = ∫ ...

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Abstract

The invention relates to a seismic signal resolution enhancement method based on time-frequency domain energy adaptive weighting. The seismic signal resolution enhancement method comprises the steps of 1) inputting a three-dimensional post-stack seismic data volume, 2) calculating time-frequency distribution of seismic signals of the three-dimensional post-stack seismic data volume channel by channel by use of generalized S transformation, and calculating the amplitude of a time-frequency spectrum, 3) calculating a reference instantaneous spectrum function for instantaneous spectrum adaptive weighting, 4) calculating an instantaneous spectrum adaptive weighting coefficient for the seismic signals by use of the reference instantaneous spectrum function, and 5) performing weighting processing on the instantaneous spectrum of the seismic signals by use of the instantaneous spectrum adaptive weighting coefficient to form a new three-dimensional post-stack seismic data volume of which the seismic resolution is enhanced, namely the seismic resolution enhanced seismic signals. The seismic signal resolution enhancement method based on time-frequency domain energy adaptive weighting can be widely applied to processing and explanation of petroleum seismic exploration data.

Description

technical field [0001] The invention relates to the field of petroleum seismic exploration data processing and interpretation, in particular to a seismic signal resolution enhancement method based on time-frequency domain energy self-adaptive weighting. Background technique [0002] Using seismic signals to extract the characteristics of stratigraphic sequence changes, the position and thickness of stratigraphic reflection interfaces is an important content of oil and gas geophysical exploration. Seismic signal can be regarded as the formation of seismic wavelets filtered by the ground and added with noise. Therefore, it is a comprehensive reflection of information such as seismic wavelets, formation reflection coefficients, and noises that change simultaneously in time and space. The signal extracts information such as the formation reflection position and its lateral variation, and the thickness of the formation to provide information sources. The seismic signal spectrum ...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 赵伟陈学华贺振华翁斌姜秀娣朱振宇桑淑云丁继才陈剑军王清振印海燕郝振江糜芳
Owner CHINA NAT OFFSHORE OIL CORP
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