Method of correcting stack velocity among different treated sides

Abstract

The invention provides a method of correcting the stack velocity among different treated sides, belonging to the exploration earthquake data processing field. The method comprises: a first step of inputting a VT logarithmic function Vold (T0) and the vertical time shifting amount delta t of a stack velocity analysis processing surface at a position; a second step of for all VT logarithmic functions Vold (T0) in a work area, calculating a VT logarithmic function Vnew (T0) corresponding to a new reference surface, wherein Vnew= Vold / radical sign (1+deltat / T0), and T0 is the vertical double pass travel time of reflection waves; a third step of outputting the Vnew (T0) corresponding to a new reference surface corresponding to the analysis position of all VT logarithmic functions Vold (T0) in a work area; and a fourth step of establishing a velocity model by using the VT logarithmic function Vnew (T0) corresponding to a new reference surface .

Description

technical field [0001] The invention belongs to the field of exploration seismic data processing, and specifically relates to a method for correcting stacking velocities between different processing surfaces, which is used for converting the stacking velocities analyzed on different processing surfaces to another processing surface in seismic data processing in areas with undulating terrain Correction. Background technique [0002] The stacking velocity analysis technology based on the horizontal fixed surface is a mature processing technology. Its theoretical basis is the horizontal layered medium, and the shot point and the receiver point are required to be on the same datum plane. When the near-surface structure changes laterally, especially when the surface height difference is large, static correction processing is required before the velocity analysis, and the shot point and receiver point are corrected to the unified processing datum through static correction technolo...

AI Technical Summary

Problems solved by technology

When applying the velocity function analyzed on one processing surface to another processing surface, the following two methods are usually used: one is to apply directly approximately, but when the elevation difference between the reference surfaces is large or the static correction amount is large The error is larger when the value is large; the other is to re-modify the velocity analysis results formed in the previous period one by one based on the principle of velocity spectrum after the datum is changed, but this fails to make full use of the velocity function picked up in the previous analysis, and it will cost a lot of time. Manpower and material resources, and work efficiency is not high

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