Space-variant-multi-time-window fusion high-precision residual static correction method

Abstract

Provided is a high-precision residual static correction method with combination between space variation and a plurality of time windows. The high-precision residual static correction method with combination between space variation and the time windows comprises the steps of (1) obtaining an accurate basic static correction value, solving the problem of the long wavelength, (2) carrying out pre-stack noise removal to increase the signal to noise ratio, (3) carrying out three-dimensional space control on the space of an underground structure to select and determine space-variant time windows, (4) determining the number of the space-variant time windows and the time range according to the variation trend of the underground structure, (5) carrying out calculation to obtain models and residual static correction values through different space-variant time windows according to the selected time range, (6) resolving the residual static correction value, carrying out three-dimensional space splicing on the residual static correction value according to the stacking effect calculated through different space-variant time windows, and (7) resolving the spliced residual static correction value into respective shot points, geophones and a CMP residual static correction value. The integral signal to noise ratio of a stacked section obtained through the high-precision residual static correction method with combination between space variation and the time windows is increased, The whole appearance of the section can be clearer compared with the result obtained through conventional residual static correction of a single time window, local details can be clearer, and the high-precision residual static correction method with combination between space variation and the time windows is especially feasible and effective in a double-complexity area and an area with a low signal to noise ratio.

Description

technical field [0001] The invention belongs to the technical field of petroleum seismic exploration, technical processing and interpretation of seismic data, and specifically relates to a high-precision three-dimensional static correction based on variogram fitting and reconstruction, a space-variant-multi-time window fusion high-precision residual static correction method. Background technique [0002] In the prior art, after the basic static correction, it is generally necessary to further eliminate the influence of the short-wavelength static correction through residual static correction processing. At present, there are mainly three types of residual static correction schemes: one is the surface consistent residual static correction method based on the correlation class, which picks up the time-shift of the seismic trace through correlation and other schemes, and inverts the picked-up time-shift to obtain the shot, The calculation efficiency of this method is relatively...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the remaining static correction distortion caused by the inaccurate dynamic correction speed in double-complex and low signal-to-noise ratio areas, and to avoid the disadvantages of non-surface consistent algorithms such as Trim that are prone to false structures, and to provide a space Variable-multi-time window fusion high-precision residual static correction method; this method can not only eliminate the influence of velocity error on the calculation of residual static correction, but also effectively solve the problem of non-surface consistent static correction to a certain extent

Images