Wave-Field Reconstruction for Curved-Streamer Ghost Attenuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing seismic data processing methods for marine seismic data acquisition with curved streamers are inadequate for handling both pressure and particle motion data, leading to inaccurate subsurface imaging due to ghost wave interference.
Innovation Solution
A method for processing seismic data using a model in a second domain to separate and attenuate up-going and down-going wave-fields, incorporating hydrophone and particle motion data, and applying transforms to achieve wave-field reconstruction, deghosting, and redatuming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional seismic data processing methods are used for marine seismic data acquisition with curved streamers, then processing can be performed with standard techniques, but the handling of both pressure and particle motion data is inadequate leading to inaccurate subsurface imaging
Solution Approach 1:
The processing system is designed to handle both pressure data (from hydrophones) and particle motion data (from accelerometers/velocity sensors) within a unified framework. The method applies wavefield separation techniques that work for both data types simultaneously, enabling the system to process multiple data types with a single processing flow rather than requiring separate specialized methods for each data type.
Solution Approach 2:
The patent transforms the seismic data from the time-domain to the frequency-domain using Fourier transforms, and then applies wavefield separation in the frequency-domain. This parameter change in the mathematical domain allows for effective separation of up-going and down-going wavefields by exploiting the different propagation directions, which would be difficult to achieve in the time-domain with conventional methods.
2Measurement precision
If ghost wave interference is present in seismic data, then data can be recorded with simple receivers, but accurate subsurface imaging becomes difficult due to interference between primary and ghost arrivals
Solution Approach 1:
The method extracts and separates the ghost wavefield from the total recorded seismic signal by applying wavefield separation techniques in the frequency-domain. By isolating the down-going (ghost) wavefield component, it can be removed or attenuated from the up-going (primary) wavefield, effectively taking out the harmful ghost interference from the useful primary signal.
Solution Approach 2:
The patent introduces an intermediate processing step in the frequency-domain that acts as a mediator between the raw recorded data and the final subsurface image. The frequency-domain transformation and wavefield separation operations serve as intermediary processes that facilitate the removal of ghost effects without requiring complex hardware modifications.
3Measurement precision
If wavefield separation is performed to remove ghosts and improve imaging, then subsurface imaging accuracy is enhanced, but the processing requires transformation to a model in a second domain increasing computational complexity
Solution Approach 1:
The patent replaces complex time-domain processing operations with frequency-domain operations. By using Fourier transforms to convert the data representation from time-domain to frequency-domain, the wavefield separation can be achieved through simpler algebraic operations on the transformed data, substituting complex temporal processing with more manageable spectral processing.
Data Source
AI summary
Computing device, computer instructions and method for processing input seismic data d associated with a surveyed subsurface. The method includes: receiving the input seismic data d recorded in a first domain by seismic receivers that travel in water, the input seismic data d including pressure data and particle motion data; generating a model p in a second domain, which is different from the first domain, to describe the input seismic data d; processing the model p to generate an output seismic dataset with attenuated noise; and generating an image of the surveyed subsurface based on the output seismic dataset.