Method for determining large transverse wave static correction value of converted wave demodulator probe

Abstract

The invention discloses a method for determining a large transverse wave static correction value of a converted wave demodulator probe, which is adaptive to conditions of low signal-to-noise ratio and complex construction. The method comprises: calibrating a group of reflecting layers on longitudinal wave and converted wave common demodulator probe superposing data; picking a group of reflecting layer positions to obtain a longitudinal wave reflection time along the layers on longitudinal wave common demodulator probe superposing data; picking a group of reflecting layer positions to obtain a converted wave reflection time along the layers on the converted wave common demodulator probe superposing data; on the longitudinal wave and converted wave common demodulator probe superposing data, selecting points which can represent longitudinal wave and converted wave construction forms, and coupling same layer positions of longitudinal waves and converted waves to obtain a sparse longitudinal and transverse wave velocity ratio value gamma [0]; and finally calculating to obtain the transverse wave static correction value of the converted wave demodulator probe. By using the method provided by the invention, a large transverse wave static correction value of a converted wave demodulator probe can be effectively determined.

Description

technical field [0001] The invention relates to seismic data processing technology, and is a method for determining the shear wave static correction amount with a large converted wave detection point. Background technique [0002] In seismic exploration, due to the undulations of the terrain and the low surface near the surface, the lateral change of the velocity reduction zone and the difference in the depth of the excitation point, it will definitely affect the shape of the time-distance curve of the measured reflected seismic signal, and there is a normal offset in the seismic record. In addition to the normal time difference caused by distance and depth changes, there will also be time delay changes caused by the anomaly of the surface and shallow low and speed-down zones. This time difference change must be corrected and eliminated in the processing of reflected waves in order to obtain correct imaging of underground structures. And this time difference correction amou...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned methods for obtaining the static correction of converted waves all have certain application conditions, especially the ...

Images