Method for generating longitudinal wave time domain high precision converted wave sectional plane

Abstract

The invention relates to a method for generating the P-wave time-domain high-precision converted wave profile in the geophysical prospecting, comprising the following steps: picking up the location of a selected index bed on the P-wave seismic profile and the converted wave seismic profile; calculating the compression ratio of the converted wave in relation to the P-wave; re-sampling and compressing, and transforming the converted wave time domain into the P-wave time domain; extracting the seismic attributes of the instantaneous amplitude, the instantaneous phase and the instantaneous frequency; calculating the cross-correlation coefficients of the compressed converted wave seismic attributes to evaluate the arithmetic mean value of the cross-correlation coefficients; determining the points with the cross-correlation coefficients greater than the threshold value as the changeable control points; evaluating the compression ratio of the converted wave between two adjacent control points, relative to the P-wave; and converting the seismic trace to obtain the high-precision conversion wave profile of the P-wave time domain. The invention makes use of the reflection intensity, instantaneous phase, instantaneous frequency and other attributes, and takes into account the advantages of the standard horizon method and the cross-correlation method so as to achieve highly precise and strongly reliable results.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration and seismic technology, and is a method for generating high-precision converted wave profiles in the longitudinal wave time domain based on multi-attribute cross-correlation technology Background technique [0002] Three-dimensional and three-component seismic exploration in petroleum seismic exploration technology involves seismic waves such as longitudinal wave, shear wave and converted wave. Since the longitudinal waves, shear waves and converted waves have different propagation velocities, the vertical lengths of the longitudinal wave profiles, shear wave profiles and converted wave profiles formed by them are different. In three-dimensional three-component seismic exploration, the domain type corresponding to the original longitudinal wave profile is generally It is called the longitudinal wave time domain, the domain type corresponding to the original shear wave profile is ca...

AI Technical Summary

Problems solved by technology

However, there are two weaknesses in the standard horizon method: one is that at least two horizons are required, and they need to be interpreted within the scope of the entire work area; A high-precision converted wave profile is formed between two large sets of formations

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