Method and device for determining quality factor in depth domain

Abstract

Embodiments of the application provide a method and device for determining a depth domain quality factor, wherein the method comprises the following steps: acquiring a seismic record of a target area;acquiring a time domain offset gather and a seismic reflection interface according to the seismic record; performing autocorrelation processing on the time domain offset gather at the seismic reflection interface to obtain an autocorrelation function of the time domain offset gather; acquiring an amplitude spectrum of the autocorrelation function of the time domain offset gather; determining an effective quality factor according to the amplitude spectrum; and determining a depth domain quality factor according to the effective quality factor. Since the scheme first performs autocorrelation processing on the time domain offset gather and acquires an amplitude spectrum according to the processed autocorrelation function so as to eliminate the noise interference in the data and obtain a moreaccurate amplitude spectrum, and then determines an effective quality factor using the amplitude spectrum to determine a depth domain quality factor, thereby solving the technical problem of determining the depth domain quality factor with poor accuracy and low resolution in the existing methods.

Description

technical field

[0001] The present application relates to the technical field of seismic exploration, in particular to a method and device for determining quality factors in depth domains. Background technique

[0002] In seismic exploration, it is often necessary to use seismic data (such as seismic records, etc.) of a target area to perform migration imaging, so as to carry out specific seismic exploration of the target area according to the imaging results.

[0003] When using seismic data for migration imaging, in order to reduce the error caused by the abnormal amplitude caused by the absorption and attenuation of seismic data, the corresponding depth domain quality factor (or QF quality factor, effective Q value) to measure the ratio of total energy to absorbed energy in seismic data, and then use the above-mentioned quality factor in the depth domain to perform pre-stack depth migration imaging, thereby reducing the impact of absorption attenuation.

[0004] At prese...

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