Frequency-Dependent Reflection Operator for Marine Seismic Ghost Data Removal
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Solution Overview
Problem
Marine seismic surveying is hindered by ghost data, which results from reflections at the air-water interface, leading to reduced accuracy in subsurface structure representation due to amplitude and phase distortions and frequency losses.
Innovation Solution
A method and system utilizing a frequency-dependent reflection operator to compute and remove the effects of wavefield reflections from interfaces, specifically designed to address ghost data in seismic survey data by generating deghosted data through a forward model that accounts for varying reflection coefficients at different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If seismic survey data is collected in a marine environment, then subsurface structure information can be obtained, but ghost data from air-water interface reflections degrades data accuracy
Solution Approach 1:
The patent extracts and removes the harmful ghost data component from the seismic survey data by computing the reflected wavefield using a frequency-dependent reflection operator and subtracting it from the measured data, thereby isolating the useful subsurface reflection signals
Solution Approach 2:
The patent introduces a frequency-dependent reflection operator as an intermediary that models the air-water interface reflection effects, allowing the harmful ghost data to be characterized and removed through computational processing rather than physical modification
2Object-generated harmful factors
If traditional deghosting methods are used, then some ghost data can be removed, but frequency-dependent reflection characteristics are not accurately captured
Solution Approach 1:
The patent employs a frequency-dependent reflection operator that varies the reflection coefficient parameter across different frequency ranges, accurately capturing the frequency-dependent characteristics of air-water interface reflections and enabling precise deghosting across the entire frequency spectrum
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach effectively mitigates ghost data artifacts, enhancing the accuracy of subsurface structure representation by accurately removing interference effects from the air-water interface, thereby improving the quality of seismic data.
Implementation Method 1
a reflected seismic wavefield (that is in response to the seismic wavefield propagated by the seismic source) propagates generally upwardly toward an arrangement of seismic receivers
Implementation Method 2
based at least in part on a frequency dependent reflection operator, a wavefield propagating in a survey environment is computed, where the reflection operator represents a wavefield reflection from an interface that causes ghost data
Data Source
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AI summary
Measured survey data is deghosted by removing an effect of a reflected wavefield reflected from an interface that causes ghost data in the measured survey data, the deghosting of the measured survey data using a frequency-dependent reflection operator that represents different wavefield reflections from the interface at corresponding different frequencies.