Marine Seismic Data Denoising and Multiple Attenuation
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Solution Overview
Problem
Existing methods for processing marine seismic data struggle to simultaneously remove noise and multiples effectively, often requiring separate steps and being affected by high noise levels in the vertical component, which complicates wave-field separation and interpretation.
Innovation Solution
A method that simultaneously denoises and attenuates multiples by separating seismic data into up-going and down-going wave-fields, calculating up-down deconvolution, generating a multiple model, and adaptively subtracting it from the pressure component to obtain a corrected pressure component free from noise and multiples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional noise attenuation methods are applied to marine seismic data, then noise levels are reduced, but multiples remain contaminated and wave-field separation is complicated by high noise in the vertical component
Solution Approach 1:
The patent segments the seismic wavefield into up-going and down-going components through wave-field separation. This segmentation allows independent processing of each component, enabling noise attenuation in the vertical component while preserving multiples in the pressure component, thereby resolving the contradiction between removing noise and maintaining multiple integrity.
Solution Approach 2:
The patent introduces an intermediary processing stage that occurs after wave-field separation but before final data output. This intermediary step applies noise attenuation only to the vertical component while preserving the pressure component with multiples, effectively mediating between the conflicting requirements of noise removal and multiple preservation.
2Reliability
If separate processing steps are used for noise attenuation and multiple removal, then each step can be optimized, but processing complexity and time increase
Solution Approach 1:
The patent merges noise attenuation and multiple removal into a unified processing framework that operates on the separated wavefield components. By combining these operations into a single integrated process rather than separate sequential steps, the patent maintains processing effectiveness while reducing overall complexity and time requirements.
3Measurement precision
If the vertical component is used for wave-field separation, then complete separation is achieved, but high noise levels compromise the accuracy of the separation results
Solution Approach 1:
The patent applies local quality by treating the vertical component and pressure component differently based on their specific characteristics. The vertical component, despite having high noise, is still used for wave-field separation because it provides complete separation capability. The noise attenuation is then applied locally to the vertical component after separation, preserving the accuracy of the separation results while removing noise.
Data Source
AI summary
Computing device, computer instructions and method for simultaneously denoizing and attenuating multiples in seismic data recorded with seismic receivers. The method includes receiving the seismic data, wherein the seismic data includes a pressure P component and a vertical Z component; separating the seismic data into up-going U wave-fields and down-going D wave-fields; calculating an up-down deconvolution R based on the up-going U and the down-going D wave-fields; generating a multiple model M based on the up-down deconvolution R; and adaptively subtracting the multiple model M from the pressure P component to obtain a corrected pressure Pfree component from which simultaneously the noise and the multiples were removed. A multiple is a wave-field that propagates from a source to a receiver and experiences more than one reflection.