Seismic Noise Attenuation During Simultaneous Source Deblending
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Solution Overview
Problem
Simultaneous source acquisition in seismic surveys leads to blending noise interference, making it difficult to separate coherent signals from incoherent noise without affecting the integrity of blending noise, especially when the amplitude of incoherent noise is stronger than the weak coherent signals, resulting in inadequate deblending operations.
Innovation Solution
Expand the gather window to include seismic data before the time of seismic source excitation, applying noise attenuation techniques to transfer ambient noise signals to a portion of the dataset, enhancing deblending operations and improving signal separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise attenuation techniques are applied to remove incoherent noise, then noise reduction is improved, but blending noise integrity is compromised
Solution Approach 1:
The patent segments the noise attenuation process into two distinct stages: first removing incoherent noise from the blended data, then performing deblending operations on the cleaned data. This segmentation allows each stage to focus on its specific task without interfering with the other, thereby reducing incoherent noise while preserving blending noise integrity for subsequent separation operations
Solution Approach 2:
The patent applies noise attenuation as a preliminary action before deblending operations. By removing incoherent noise in advance, the subsequent deblending process operates on cleaner data, improving the separation of coherent signals from blending noise without the interference of incoherent noise components
2Measurement precision
If conventional deblending operations are performed, then signal separation is attempted, but weak coherent signals are lost due to stronger incoherent noise interference
Solution Approach 1:
The patent extracts and removes incoherent noise components from the blended seismic data before performing deblending operations. By taking out the harmful incoherent noise that masks weak coherent signals, the subsequent separation process can more effectively recover weak coherent signals that would otherwise be lost or contaminated by the stronger incoherent noise interference
Solution Approach 2:
The patent converts the harmful effect of incoherent noise into a benefit by using noise attenuation techniques to characterize and remove these noise components. The process transforms the previously harmful incoherent noise into identifiable and removable elements, thereby improving the signal-to-noise ratio and enabling better recovery of weak coherent signals that were previously obscured
Data Source
AI summary
A device may include a processor that may separate or deblend signals acquired with simultaneous source shooting, in an environment with background noise or other types of noises. The processor may expand a receiver gather before the time of source excitation. The processor may use the expanded time window (e.g., negative time window) to allocate the background noise or other types of noises after removal. The processor may use signal recovery operations to reallocate leaked or misplaced signals created during the separation iterations, including the signals inside the expanded time window, to a correct source excitation and timing. Expanding a receiver gather time window and reallocating leaked or misplaced signals may improve a deblended output used in generating a seismic image.