Surface seismic wave quality factor extraction method and device

Abstract

The invention provides a surface seismic wave quality factor extraction method and device. The method comprises the following steps of acquiring WalkawayVSP data of each measurement point in a to-be-measured area; based on a spectral ratio method, calculating the value of a surface seismic wave quality factor of each measuring point according to the WalkawayVSP data of each measuring point; and establishing a surface seismic wave quality factor field of the to-be-measured area according to the value of the surface seismic wave quality factor of each measuring point and the surface thickness ofeach measuring point. According to the method, when the value of the surface seismic wave quality factor is solved, the WalkawayVSP technology is applied, a seismic processing compensation problem caused by seismic wave absorption and attenuation due to near-surface low and deceleration zones is solved, and therefore the surface seismic wave quality factor which can be directly used for ground seismic processing is obtained; the device is simple in structure, easy to implement, high in reliability and beneficial to subsequent technical improvement of seismic wave accurate imaging, resolutionimprovement and the like.

Description

technical field [0001] The invention relates to seismic data acquisition, processing and analysis technology in geophysical prospecting, belongs to the technical field of well geophysics, and in particular relates to a method and device for extracting surface seismic wave quality factors. Background technique [0002] Surface seismic wave quality factor (surface Q factor) analysis has always been an important and difficult topic in seismic exploration. How to accurately extract the surface seismic wave quality factor and effectively compensate seismic data is one of the research goals of geophysicists in recent years. . As early as the 1970s, scholars have realized that to improve the quality of seismic records, attenuation compensation is a seismic parameter that must be considered. Therefore, in addition to seismic wave velocity, attenuation compensation is another seismic parameter that can be used in lithology research. Hamilton and Hauge were the first to study the re...

AI Technical Summary

Problems solved by technology

Compared with the dense deep strata, the loose low-velocity strata near the surface absorb and attenuate seismic high-frequency signals very seriously, resulting in seismic wavelet amplitude attenuation and phase distortion, reducing the reliability of seismic exploration

For the absorption attenuation in deep formations, the current practice is to calculate the absorption factor through zero well-source spacing VSP logging, but the absorption factor of the shallow surface cannot be calculated using this VSP logging method

Images