Seismic trace set dynamic correction stretching correction pre-processing technology before AVO inversion depending on frequency

Abstract

A seismic trace set dynamic correction stretching correction pre-processing technology before AVO inversion depending on frequency is an oil seismic exploration data processing and explaining technology, which eliminates the problem about dynamic correction stretching of frequency and amplitude distortion caused by dynamic correction processing, and effectively reserves feature information including amplitude following frequency, incident angle or offset variation of seismic reflection in the seismic trace set. The method including the steps of: firstly analyzing variation situation of the amplitude and the frequency along with the offset, adopting offset data with high frequency as a target trace of time-varying matched filtering at a small offset end, and getting a time-varying matched filtering factor, performing time-varying matched filtering on the seismic trace of each offset and the target trace, meanwhile correcting amplitude distortion, and thereby achieving the seismic trace set after being corrected by dynamic correction stretching. The technology is used for preprocessing pre-stack seismic data bore AVO inversion depending on frequency in oil and gas seismic exploration, and improves precision and reliability of subsequent geographical parameter inversion and oil and gas recognition of a reservoir stratum.

Description

technical field [0001] The invention relates to the field of petroleum seismic exploration data processing and interpretation. It solves the dynamic correction stretching problem introduced by conventional motion correction processing (NMO) through a time-varying matched filter algorithm, and eliminates the low-frequency effect caused by the dynamic correction stretching problem. and amplitude distortion, effectively retaining the characteristic information of the true amplitude of seismic reflections in seismic traces changing with frequency, incident angle or offset, as a pre-stack seismic gather preprocessing technology to improve the reliability of frequency-dependent AVO inversion. Background technique [0002] Motion correction is an important step in seismic data processing. The purpose of motion correction is to eliminate the influence of different offsets on the travel time of reflected waves, and to straighten the trajectory of time-distance curves of reflected wave...

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Problems solved by technology

[0005] After the above method eliminates the stretching phenomenon of dynamic correction, it is difficult to completely eliminate the stretching phenomenon of seismic reflection without distorting the amplitude and frequency information of the original seismic record, and destroying the variation of seismic reflection amplitude with offset or incident angle in the reservoir. The effective feature information of these features will cause serious interference to the processing that needs to use these feature information to extract reservoir physical parameters and detect oil and gas, which is not conducive to the frequency-dependent AVO inversion, increasing the uncertainty and multi-solution of the inversion, Caused many false impressions for the follow-up earthquake interpretation work

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