Migration Gather Amplitude Correction via Reference Model
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Solution Overview
Problem
Designing reverse time migration (RTM) to achieve amplitude versus offset (AVO) compliance is challenging due to the complexity of the subsurface, particularly in compensating for geometry spreading and transmission loss.
Innovation Solution
A computer-implemented method and system that generate a compensation volume based on a reference seismic model to adjust migration gathers, ensuring they preserve true seismic signal amplitudes and eliminate noise by simulating seismic energy generation and recording reflections, allowing for AVO-compliant migration gathers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional seismic migration is used, then subsurface imaging is achieved, but amplitude versus offset compliance is not maintained due to geometry spreading and transmission loss
Solution Approach 1:
The patent applies preliminary action by generating a compensation volume before adjusting the migration gather. The compensation volume is calculated based on reference data and a reference seismic model, pre-computing the necessary corrections for geometry spreading and transmission loss that will be applied during the adjustment phase.
Solution Approach 2:
The patent employs parameter changes by modifying the migration gather using the compensation volume, which contains amplitude corrections derived from the reference seismic model. This changes the amplitude parameters of the seismic data to achieve AVO compliance while accounting for geometry spreading and transmission loss effects.
2Manufacturing precision
If compensation for geometry spreading and transmission loss is implemented, then AVO compliance is achieved, but computational complexity increases
Solution Approach 1:
The compensation volume is pre-calculated using reference data and a reference seismic model before the actual migration gather adjustment. This preliminary computation separates the complex amplitude correction calculations from the main migration process, reducing real-time computational complexity while maintaining precision.
Solution Approach 2:
The patent uses a reference seismic model to generate reference data that serves as a template for creating the compensation volume. This copying approach allows the system to leverage pre-computed reference information rather than calculating all corrections from scratch for each migration gather, thereby reducing computational complexity.
3Measurement precision
If reference seismic model is used to generate compensation volume, then noise is eliminated and true amplitudes are preserved, but processing time increases
Solution Approach 1:
The compensation volume is generated in advance using the reference seismic model and reference data, separating the time-consuming amplitude correction calculations from the main migration processing. This preliminary generation of compensation data reduces the processing time required during actual migration gather adjustment while maintaining measurement precision.
Solution Approach 2:
The system copies amplitude correction information from the reference seismic model to the actual migration gather through the compensation volume. This copying mechanism allows the system to preserve true seismic amplitudes and eliminate noise by transferring proven correction patterns from reference data without re-computing them for each gather.
Data Source
AI summary
Methods and systems for adjusting migration gather are disclosed. A method for adjusting migration gather may include generating a first migration gather based on acquired seismic data. The method may also include generating a compensation volume based on reference data produced utilizing a reference seismic model. The method may further include applying the compensation volume to adjust the first migration gather.