Seismic Acquisition Illumination Calculation via Source Wavefield Decimation
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Solution Overview
Problem
Current Reverse Time Migration (RTM) processes in seismic data processing are computationally intensive due to the lack of receiver-side wavefield calculation, leading to high computational costs and impractical processing times for acquisition illumination.
Innovation Solution
A method that utilizes source-side wavefields generated during regular RTM processing to calculate acquisition illumination, reducing computational costs by decimating receiver locations and using zero-offset receivers to calculate both source-side and receiver-side illuminations efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RTM processing is used to calculate acquisition illumination, then imaging quality is improved, but computational time and cost increase significantly
Solution Approach 1:
The patent segments the illumination calculation into source-side illumination and receiver-side illumination components. By calculating these separately and combining them, the method achieves full illumination information without requiring complete reprocessing of all wavefields, thus reducing computational time while maintaining imaging quality.
Solution Approach 2:
The patent performs preliminary calculation of source-side illumination during the regular RTM processing, and then uses this pre-calculated information along with receiver locations to compute the complete acquisition illumination. This preliminary action avoids redundant calculations and significantly reduces the additional computational time required.
2Loss of information
If full survey illumination calculation is performed, then comprehensive acquisition information is obtained, but computational cost becomes impractical
Solution Approach 1:
The patent extracts the essential components needed for illumination calculation (source-side wavefields from RTM and receiver locations) without requiring complete recalculation of all wavefields. This extraction approach obtains comprehensive acquisition information while avoiding the prohibitive computational cost of full survey reprocessing.
Solution Approach 2:
The method uses the source-side wavefields that are already generated during regular RTM processing, making them serve dual purposes: both for imaging and for illumination calculation. This self-service approach eliminates redundant computations and reduces computational cost while maintaining information completeness.
3Measurement precision
If receiver-side wavefield calculation is included, then complete illumination information is achieved, but processing complexity increases
Solution Approach 1:
The patent merges the source-side illumination calculation (already performed in RTM) with the receiver-side illumination calculation by combining them through multiplication. This merging approach achieves complete illumination information while avoiding the complexity of separate full wavefield calculations for both sources and receivers.
Data Source
AI summary
New methods for calculating acquisition illumination are computationally less expensive in comparison with conventional methods. In one such new method, source wavefield propagations are calculated and assigned to corresponding zero-offset receivers. Further, the number of non-zero-offset receivers within the coverage of the shot at the source location is decimated. Such a method is most advantages in reverse time migration, in which all source wavefield propagations are already calculated. The receiver-side illumination for each shot can be obtained by summing up all the source-side illumination with the source located within receiver coverage. All the source-side illumination and receiver-side illumination can be summed up to get the acquisition illumination for the survey. The acquisition illumination can be used to value the acquisition system and to compensate the migration images.