Spectral Shaping Inversion for Seismic Data Processing
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Solution Overview
Problem
Current seismic inversion techniques are limited by the need for accurate well ties and are typically applied after migration, which can lead to excessive amplification of steeply-dipping energy and increased computational costs due to the dip-dependence of the wavelet after migration.
Innovation Solution
Applying spectral shaping inversion before migration, which does not require an estimate of the seismic wavelet and can be performed with knowledge of the average frequency spectrum of well log and seismic data, reduces amplification of dipping energy and optimizes computational efficiency by allowing inversion at various stages of the modeling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spectral shaping inversion is applied after migration, then the inversion can be performed with migrated seismic data, but excessive amplification of steeply-dipping energy occurs and computational costs increase
Solution Approach 1:
The patent applies spectral shaping inversion before migration rather than after migration. By performing the inversion operation on the pre-migrated seismic data, the method avoids the dip-dependence problem that occurs after migration, thereby preventing excessive amplification of steeply-dipping energy while still achieving accurate impedance estimates.
2Measurement precision
If spectral shaping inversion is applied after migration, then the inversion can utilize migrated data structure, but computational costs increase due to dip-dependence of the wavelet
Solution Approach 1:
The patent performs spectral shaping inversion on pre-migrated data before the migration process is applied. This preliminary inversion avoids the computational complexity introduced by dip-dependent wavelets after migration, significantly reducing computational costs while maintaining inversion accuracy.
3Measurement precision
If traditional inversion techniques are used, then accurate well ties are required, but this increases device complexity and processing requirements
Solution Approach 1:
The patent employs spectral shaping inversion which transforms the inversion approach by operating in the frequency domain and using spectral shaping filters. This parameter change in the inversion methodology eliminates the requirement for accurate well ties, thereby reducing processing complexity and device requirements while maintaining accurate impedance estimation.
Data Source
AI summary
A geophysical model of a subsurface region is generated based on seismic data, e.g., seismic reflection data. Migration and seismic inversion are applied to the seismic data to generate estimates of one or more physical or seismic properties of the subsurface region. Seismic inversion, such as spectral shaping inversion, is applied before or after migrating the seismic data through a variety of techniques that each avoid the amplification of dipping energy while optimizing computational efficiency and/or accuracy.