ICA Wavefield Separation for Subsurface Imaging Accuracy
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Solution Overview
Problem
Current seismic processing techniques struggle to accurately identify subtle geological features and local discontinuities in the subsurface, particularly those that vary with azimuth, due to limitations in separating different wavefield components.
Innovation Solution
The method employs independent component analysis (ICA) on migrated azimuthal dip-angle gathers to separate wavefield components such as reflections, random noise, coherent noise, and seismic lineament components, allowing for the identification of geological features within a geological region of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional seismic processing techniques are used, then the processing workflow is simple and fast, but the ability to identify subtle geological features and local discontinuities is insufficient
Solution Approach 1:
The patent applies segmentation by decomposing the seismic wavefield into distinct components (primary reflections, multiples, noise) using independent component analysis. This separation allows each component to be processed and analyzed independently, improving the identification of subtle geological features while managing complexity through systematic decomposition of the processing workflow
Solution Approach 2:
The patent introduces independent component analysis as an intermediary technique between conventional seismic processing and geological interpretation. This intermediary method separates wavefield components before final imaging, enabling better detection of local discontinuities and subtle features without requiring complete redesign of the entire processing system
2Measurement precision
If independent component analysis is applied to separate wavefield components, then the identification of subtle geological features improves, but the computational complexity and processing time increase
Solution Approach 1:
The patent applies preliminary action by performing independent component analysis on pre-migrated seismic data before final imaging and interpretation. This preliminary separation of wavefield components prepares the data in advance, making subsequent geological feature identification more efficient and reducing the need for iterative processing
Solution Approach 2:
The patent implements partial action by applying independent component analysis selectively to specific depth ranges, azimuthal bins, or seismic events of interest rather than processing the entire dataset uniformly. This approach maintains high separation accuracy for critical features while reducing overall computational time and resource requirements
3Measurement precision
If migrated azimuthal dip-angle gathers are processed, then the resolution of subsurface imaging is enhanced, but the difficulty of detecting and measuring geological features increases
Solution Approach 1:
The patent applies the extraction principle by isolating specific wavefield components (such as seismic lineament components representing diffractions) from the complex migrated azimuthal dip-angle gathers. This extraction of relevant signals from the complex data volume simplifies the detection and measurement of geological features while preserving the enhanced resolution benefits of azimuthal dip-angle processing
Data Source
AI summary
A method may include determining various migrated azimuthal dip-angle gathers based on a migration function and seismic data from a seismic survey regarding a geological region of interest. The method may further include determining various partial dip-angle images using the migrated azimuthal dip-angle gathers. The method may further include determining various azimuthal bins that include the partial dip-angle images. The method may further include determining various wavefield components using an independent component analysis (ICA) function and the partial dip-angle images among the azimuthal bins. The method may further include determining a geological feature within the geological region of interest using the wavefield components.