Method for eliminating pseudo-reflection of inclined cable based on Radon conversion

Abstract

The invention provides a method for eliminating pseudo-reflection of an inclined cable based on Radon conversion. The method comprises the following steps: (a) carrying out forward simulation to obtain a shot record; (b) performing Radon conversion on the shot record in an x-t domain to obtain Radon domain data; (c) performing inverse Radon conversion to forecast the pseudo-reflection; (d) subtracting the pseudo-reflection from original data to obtain data subjected to pseudo-reflection elimination. According to the method, all detection points in the inclined cable are calculated by an interpolation method, trapped wave points are mutually compensated, so that the aim of expanding the frequency band is finally fulfilled; by Radon conversion, the inclined cable is corrected into a horizontal cable, and then inverse conversion is realized, namely data of the sea surface is converted to the original position of the inclined cable, and a sea surface earthquake record is reduced to the pseudo-reflection at the position of the inclined cable, so that the pseudo-reflection at the position of the inclined cable is forecast; pseudo-reflection waves are subtracted from the original data, so that the data subjected to pseudo-reflection elimination is obtained, and the resolution of the record is improved.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a method for eliminating virtual reflection of oblique cables based on Radon transformation. Background technique [0002] In conventional marine seismic exploration, the horizontal cable acquisition technology, the streamer is parallel to the sea level, and its depth remains constant; the inclined cable acquisition technology, the streamer is inclined, and its depth changes with the increase of offset. The advantage of the inclined cable is that the drag depth of the cable is relatively large, so that the collected seismic data is free from the influence of sea surface disturbance, and the signal-to-noise ratio of the data is high. Not only that, the data collected by the inclined cable can obtain a wider frequency bandwidth than that of the horizontal cable, improve high-frequency information, and obtain more low-frequency information, which is beneficial to the analysis of d...

AI Technical Summary

Problems solved by technology

In the inclined cable, obviously most of the geophones are not on the grid points, so the wave field value at the geophone cannot be directly obtained, and then a notch point is generated at the geophone, which ultimately affects the simulation of ghost reflections Effect

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