A Method of Obtaining Short-Wavelength Statics by Fitting First Arrivals

Abstract

The invention provides a method for obtaining short-wavelength static correction value through fitting of first-motion waves. The method comprises the steps that (A) a receiving point on a measuring line is selected, and a shot point set corresponding to the receiving point is obtained; (B) a first first-motion time set of a common-receiving-point gather corresponding to the receiving point and the shot point set is picked up; (C) spline restraint fitting is carried out on the picked-up first first-motion time set of the common-receiving-point gather to obtain a second first-motion time set after spline restraint fitting; (D) the residual static correction value of the receiving point is obtained based on the first first-motion time set of the common-receiving-point gather and the second first-motion time set after spline restraint fitting. The method can be used for enabling the seismic section imaging effect to be good and the calculation efficiency to be high.

Description

technical field [0001] The invention relates to the field of seismic exploration data processing. More specifically, it relates to a method for obtaining statics of two-dimensional data in complex areas. Background technique [0002] The static correction problem is a bottleneck problem restricting the development of oil and gas exploration in complex areas in my country. The static correction problem is divided into long-wavelength and short-wavelength correction problems, and the quality of the short-wavelength static correction problem directly affects the imaging effect of the seismic section. Residual static correction methods for arrival waves, refraction waves, and reflection waves. [0003] The residual static correction method based on reflected waves combined with multiple iterations of velocity picking can achieve better results in areas with better data quality, but in areas such as mountains, deserts, and thick loess plateaus, the terrain has large fluctuation...

AI Technical Summary

Problems solved by technology

The former needs to limit the first arrival time according to the offset distance, then the number of available first arrival times will be reduced, and the reliability of statistical information will be reduced; the disadvantage of the latter is that the computer cannot automatically identify direct waves, refracted waves, and reflected waves , it is impossible to judge which first arrival times come from the same layer, resulting in inaccurate calculation results

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