Static correction method for mountain areas

Abstract

The invention relates to a static correction method for mountain areas. The method includes the following steps of S1, on the basis of the field static correction amount provided by surface investigation correction, conducting updating by using a first arrival wave interactive iterative residual static correction method, eliminating a static correction error caused by surface investigation and obtaining a reference surface static correction amount with higher precision; S2, performing high-low frequency separation on the updated reference surface static correction amount, applying a separatedhigh frequency component and correcting seismic data to a CMP reference surface; S3, performing multiple iterations through a surface consistency residual static correction technique and velocity analysis and solving the residual static correction amount of a high-frequency short wavelength; S4, using simulated annealing and non-surface consistency residual static correction technology series to solve the problem that there is still residual static correction amount in areas with a low single-to-noise ratio due to the assumption limit of surface consistency; S5, applying the low-frequency static correction amount to a final superposed data body and correcting the low-frequency static correction amount to a final unified reference surface.

Description

technical field [0001] The invention relates to the technical field of exploration, in particular to a mountain static correction method. Background technique [0002] In order to ascertain the distribution of shale gas in a certain basin in China, the first seismic exploration work was carried out in this area. The topography of the shale gas exploration area in the basin is complex, with hilly and low mountain topography, with severe topography undulations in the northwest, overlapping mountains, developed water system, severe cutting, and relatively small topography undulations in the southeast of the central part. The results of the surface investigation and interpretation of the whole area show that the surface structure of this area can be divided into three layers: low-velocity layer, deceleration layer and high-speed layer. It is weathered slope accretion layer, mainly alluvial gravel layer, most of the bedrock is exposed in other areas, and the Quaternary deposits ...

AI Technical Summary

Problems solved by technology

[0003] At present, among the conventional static correction methods, the most widely used and effective methods are mainly refracted wave static correction, tomographic static correction, and field surface survey static correction, but these methods all have certain assumptions, and the complex geological conditions of the basin are difficult to As a result, the application effect of these static correction methods is poor in basins, especially in areas with complex surface structures and severe lateral velocity changes

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