Method for pre-stack like-two-dimensional transform of three-dimensional seismic record

Abstract

The invention relates to pre-stack processing of three-dimensional seismic data of geophysical prospecting and particularly to a method for pre-stack like-two-dimensional transform of three-dimensional seismic record which comprises the steps of: collecting the three-dimensional seismic data and arranging the data according to shot gather, calculating the shot-geophone distances of all demodulator probes by starting from the first measuring line of the first shot, taking a shot point as the center of circle and the shot-geophone distances of the demodulator probes as the radius to draw a circle, rotating all the demodulator probes to a straight line, completing the like-two-dimensional transform of all measuring lines of the shot for obtaining high-precision three-dimensional seismic data graph and using a regular method to carry out de-noising and static correction of three-dimensional seismic record. The method can applies two-dimensional refractive wave static correction technology to three-dimensional data processing, lead the linear characteristic of primary wave and linear interference be recovered well, is beneficial to the subsequent processing, can inhibit the linear interference well and has good de-noising effect.

Description

technical field [0001] The invention relates to geophysical prospecting technology, belongs to pre-stack processing of three-dimensional seismic data, and is a method for pre-stack quasi-two-dimensional transformation of three-dimensional seismic records that directly uses mature two-dimensional seismic data pre-stack processing methods for three-dimensional seismic data processing . Background technique [0002] In geophysical exploration technology, various processing is required on the collected data to enhance the accuracy of seismic inversion. At present, for the processing of 3D seismic records, due to the particularity of 3D seismic data, the linear features in 2D records are nonlinear, which makes it impossible to directly apply mature 2D prestack processing to 3D data during data processing. superior. In order to maintain the "linearity" of linear interference when pre-stack suppressing linear interference, we can only extract the 3D records into a common offset g...

AI Technical Summary

Problems solved by technology

At present, for the processing of 3D seismic records, due to the particularity of 3D seismic data, the linear features in 2D records are nonlinear, which makes it impossible to directly apply mature 2D prestack processing to 3D data during data processing. superior

In order to maintain the "linearity" of linear interference when pre-stack suppressing linear interference, we can only extract the 3D records into a common offset gather, or perform velocity correction, and then use the method of 2D suppression of linear interference for denoising processing, application inconvenience

In addition, in the two-dimensional refracted wave static correction method, the method of linear fitting the first wave is often used to obtain the static correction value, while in the three-dimensional case, the first wave In addition to the linear state of the record, the first arrivals of other survey lines are all nonlinear, and the curvature of the first arrival curve changes with the distance from the shot point to the survey line, which brings difficulties to the first arrival fitting. It increases the difficulty of static correction and also affects the efficiency and accuracy of static correction processing

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