Method and device for attenuating interbed multiples during process of processing marine seismic data

Abstract

The invention provides a method and a device for attenuating interbed multiples during the process of processing marine seismic data. The method comprises the following steps of preprocessing original seismic records to obtain preprocessed seismic records PPR (x, z0; t); overlapping the dynamically-corrected seismic records and obtaining the location of a strong reflecting interface L in which the interbed multiples are generated on the overlapped section; picking up primary reflection waves generated by the interface L from the dynamically-corrected seismic records, and correcting the primary reflection waves inversely and dynamically to obtain a second wave field item P2 (x, z0; t); deleting a reflected wave field above the interface L from the dynamically-corrected seismic records according to the location of the interface L, and carrying out inverse dynamic correction to obtain a first wave field item P1 (x, z0; t); setting a third wave field item P3 (x, z0; t) to be equal to the first wave field item; carrying out calculation according to the first wave field item P1 (x, z0; w), the second wave field item P2 (x, z0; w) and the third wave field item P3 (x, z0; w) to obtain the interbed multiples PLM (x, z0; w) relevant with the interface L; and attenuating the interbed multiples PLM (x, z0; t) of a time domain from the preprocessed seismic records PPR (x, z0; t) to obtain the records PME (x, z0; t) of the attenuated interbed multiples. By the adoption of the method and the device for attenuating the interbed multiples during the process of the processing marine seismic data, as the interbed multiples are predicted and attenuated only through data driving, independent of the precision of a velocity field, the processing quality of the marine seismic data is improved.

Description

technical field [0001] The invention relates to the technical field of seismic data processing, in particular to a method and device for attenuating interlayer multiple waves in marine seismic data processing. Background technique [0002] With the deepening of oil and gas exploration, marine oil and gas exploration has received more and more attention. The results of marine seismic data processing are an important basis for marine oil and gas exploration, and multiple waves are one of the most critical factors affecting marine seismic data processing. Since there are reflection interfaces with strong velocity differences at the sea level and the bottom of the sea, the reflection coefficient is very large, so the surface-related multiple waves are very serious, which seriously affects the reliability of seismic data processing, reduces the signal-to-noise ratio of data, and interferes with seismic data. Data interpreter's judgment on structure. In marine seismic data, the s...

AI Technical Summary

Problems solved by technology

This technology has a certain anti-noise ability, but because it is based on the method of wave field continuation, it needs to have high speed accuracy

Another type of method is the completely data-driven inverse scattering deinterlayer multiple wave method proposed by Weglein et al. This method can predict all interlayer multiple waves from the inverse scattering subsequence at one time, but the running cost is very high. It has not been used in industry so far

Images