Logging and seismic velocity matching method based on seismic rock physical experiment analysis

Abstract

The invention provides a logging and seismic velocity matching method based on seismic rock physical experiment analysis. The method comprises the following steps of step1, through seismic frequency band rock physical experiment analysis, establishing a changing curve of a velocity versus a frequency, which is a velocity dispersion variation law; step2, constructing a rock physical model suitable for representing a seismic frequency band dispersion characteristic; step3, using a rock physical model modulus calculation formula to carry out point-by-point mapping dispersion correction of an acoustic wave curve; and step4, carrying out synthetic record calibration on the acoustic wave curve after dispersion correction, and comparing and analyzing a seismic well bypass and a synthetic seismogram, and outputting correction curve results of all depths of an entire acoustic wave logging curve. By using the method, a matching problem between a seismic velocity and a logging velocity on a scale is eliminated, and a velocity dispersion problem caused by a large difference between the two on a frequency band is corrected; and the method has clear physical connotation and a rock physics basis, and accuracy of well-seismic matching and calibration is greatly icnreased.

Description

technical field [0001] The invention relates to the technical field of exploration geophysics, in particular to a method for matching well logging and seismic velocity based on seismic rock physics experiment analysis. Background technique [0002] In the process of inversion and interpretation, in order to realize the combination and comparative analysis of seismic data and well logging data, the usual method is to make synthetic records for well logging acoustic data, and use the synthetic records to calibrate seismic data, so that the temporal horizon information of seismic and Logged depth and lithological characteristics are combined. However, due to the differences in scale, frequency and propagation path between surface seismic and acoustic logging in terms of acquisition and processing, the formation velocity obtained by acoustic logging is inconsistent with that obtained by other observation programs such as surface seismic and VSP. In the process of well-seismic m...

AI Technical Summary

Problems solved by technology

The large frequency band difference between the logging frequency band and the seismic frequency band causes a large difference in the intrinsic dispersion and scattering dispersion between the two, which becomes a key factor affecting the matching degree of the logging velocity and the seismic velocity, and further affects the accuracy of the well-seismic calibration. Accuracy, which affects the effect of seismic interpretation and reservoir inversion

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