Method for obtaining geological parameters of weathered layer

Abstract

The invention provides a method for obtaining the geological parameters of a weathered layer. the method comprises the steps of (a) obtaining the standard first arrival data of a target area; (b) determining the minimum offset distance; (c) determining the speed value of the weathered layer of each point; (d) calculating the variation function value of the speed values of the weathered layer between any two points of selected m points; (e) calculating the variation function value of the speed values of miniature logging information between any two points of selected n points; (f) calculating the cross compiling function related to speed between any point of the m points and any point of the n points; (g) obtaining m weighting coefficients corresponding to the speed values of the weathered layer of the m points and n weighting coefficients corresponding to the speed values of the miniature logging information of the n points; (h) calculating the estimated value of the speed of the weathered layer. By the adoption of the method for obtaining the geological parameters of the weathered layer, a shallow speed structure which better accords with the geological distribution rule can be obtained.

Description

technical field [0001] The present invention generally relates to the field of analysis and processing of petroleum seismic data, and more specifically relates to a method for obtaining geological parameters of weathered layers based on collaborative Kriging technology and fusion of micro-logging data. Background technique [0002] In seismic exploration, the uneven velocity and thickness of the near-surface low-velocity zone (that is, regolith) will cause uneven travel delays in seismic wave propagation, resulting in distortion of the arrival time of reflected waves obtained in actual observations, which greatly affects the Affects imaging and tectonic morphology of seismic sections. Static correction is to eliminate the influence of the low-velocity zone on the surface on the exploration data. For the processing of seismic data under complex surface conditions, it is very critical and necessary to obtain the correct static correction value. If the serious static correctio...

AI Technical Summary

Problems solved by technology

However, the horizontal discontinuity of the seismic profile still exists in the method of velocity fitting, which needs further processing; while the velocity inversion takes a long time to calculate, and the quality of the micro-logging data will directly affect the results of the velocity inversion. The degree of certainty is high, which affects the imaging effect of stacked sections after processing, making the structural shape inaccurate, the signal-to-noise ratio is greatly reduced, and the purpose of fine data processing cannot be achieved

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