Warping Attribute for Seismic Wavefield Separation

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Solution Overview

Problem

Current seismic data analysis techniques are computationally intensive and time-consuming due to the need to account for non-uniform sea states, which complicate the separation of up-going and down-going wavefields in marine seismic surveys, leading to contamination from unwanted down-going wavefield energy.

Innovation Solution

The use of a warping attribute is introduced to characterize the effect of a non-uniform sea state on wavefields without explicitly calculating a sea-state model, allowing for the reconstruction of pseudo wavefields and reducing computational burden by simplifying the manipulation of wavefield data.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If standard techniques are used to separate up-going and down-going wavefields, then wavefield separation is achieved, but computational cost and processing time increase significantly

Engineering Contradiction:

Improvewavefield separation accuracyVSAvoidcomputational efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent extracts and removes the down-going wavefield from the total wavefield using adaptive filtering techniques. By isolating and eliminating the harmful down-going component, the system achieves clean up-going wavefield separation without requiring computationally intensive standard separation techniques, thus resolving the contradiction between separation accuracy and computational efficiency

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the parameter representation by working in the frequency-wavenumber domain instead of the time-space domain. This parameter transformation enables more efficient wavefield separation through simple filtering operations in the transformed domain, significantly reducing computational cost while maintaining separation accuracy

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If standard techniques are used to separate up-going and down-going wavefields, then wavefield separation is achieved, but processing time increases

Engineering Contradiction:

Improvewavefield separation accuracyVSAvoidprocessing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces complex mechanical-style wavefield separation algorithms with an adaptive filtering approach that uses reference wavefields to automatically identify and remove down-going energy. This substitution dramatically reduces processing time while maintaining the accuracy needed for high-quality seismic imaging

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If down-going wavefield is not removed, then processing is simpler, but seismic images contain ghost effects and noise

Engineering Contradiction:

Improveprocessing simplicityVSAvoidghost effects and noise

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful down-going wavefield into a useful reference signal for adaptive filtering. By using the down-going wavefield as a reference to drive the adaptive filter, the system effectively eliminates ghost effects and noise while maintaining processing efficiency, turning a harmful factor into a beneficial tool for wavefield separation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS10795039B2Generating pseudo pressure wavefields utilizing a warping attribute

Publication Date: 2020.10.06 PGS GEOPHYSICAL AS

AI summary

Techniques are disclosed relating to the determination of a warping attribute related to a difference between an up-going pressure wavefield and a down-going pressure wavefield received from a seismic data acquisition system. The warping attribute is used to determine a pseudo up-going or down-going pressure wavefield. The pseudo pressure wavefield is used to generate a modified record of geophysical data, which is stored in a non-transitory memory medium as a geophysical data product.