Method for revising earthquake data phase

Abstract

The invention relates to a varying phase correction method of seismic data of seismic graph with high resolution. The invention comprises that the seismic data is collected and pretreated; the phase factor is constructed; the model gather is determined; for a single shot spot and detection spot trace gathers, the phase correction factors of the shot spot and detection spot trace gathers is determined through a computation algorithm of phase correction factor; the phase correction factors of all the shot spots and detection spot trace gathers is determined; the phase correction for each seismic data gather is conducted according to the phase correction factors of shot spot gathers and detection spot trace gathers, so that the corrected seismic profiles are obtained. The invention can correctly estimate the wavelet phase variation which is caused by the structure variation of shallow surface on the seismic record; the phase correction is conducted on the basis; the phase variation caused by surface variation is eliminated, so that the aim of improving the resolution of seismic record is attained.

Description

technical field [0001] The invention relates to oil field exploration, development and mining technology, in particular to a seismic data phase-variable correction method for providing high-resolution seismic graphics for reflecting underground stratum layers and oil reservoir descriptions. Background technique [0002] The process of seismic exploration is to artificially excite seismic waves at a series of points on the ground, and the seismic waves propagate underground. When the wave impedance of the upper and lower strata is not equal), the seismic wave reflects on the wave impedance interface, the direction of seismic wave propagation changes, and the seismic wave begins to propagate upward. Receivers are placed on a series of receiving points on the ground to receive the upwardly propagating seismic wave data to complete field exploration. However, the actually received seismic wave data also contains the information of the spatial position and arrangement position o...

AI Technical Summary

Problems solved by technology

This method cannot solve the non-surface consistent phase correction of reflected waves and the phase correction of post-stack seismic data. It uses the cross-correlation function of the shot point and the receiving point to scan and determine the phase correction factor and correction results. Best, there are certain errors in the correction results of seismic data traces, and the speed of scanning to determine the phase correction factor is slow. In addition, the cross-correlation function of the shot point and the receiving point must be calculated, and the calculation of the cross-correlation function also takes a lot of computing time.

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