Seabed Velocity Tomography Using Guided-P and Scholte Wave Inversion
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Solution Overview
Problem
Existing methods for seabed shallow media velocity tomography imaging are limited by the insensitivity of Scholte wave dispersion curves to P-wave velocity changes and the lack of constraints from higher-order dispersion curves, leading to inaccurate tomography imaging and misjudgment of dispersion modes.
Innovation Solution
A method and device for P-wave and S-wave velocity tomography imaging using Guided-P and Scholte waves on multi-component seismic data, involving multichannel dispersion analysis and joint inversion of multi-order dispersion curves to iteratively update model velocities, constrained by theoretical dispersion equations, ensuring accurate determination of P-wave and S-wave velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Scholte wave dispersion inversion is used for seabed shallow media velocity imaging, then S-wave velocity can be retrieved, but the method is insensitive to P-wave velocity changes and cannot provide comprehensive velocity structure information
Solution Approach 1:
The patent combines Scholte wave dispersion inversion with Guided-P wave dispersion inversion to simultaneously retrieve both S-wave velocity and P-wave velocity. The Scholte wave provides sensitivity to S-wave velocity while the Guided-P wave provides sensitivity to P-wave velocity, merging the advantages of both methods to achieve comprehensive velocity structure imaging.
Solution Approach 2:
The patent develops a multi-functional inversion system that can retrieve multiple velocity parameters (P-wave velocity, S-wave velocity, and Vp/Vs ratio) from the same seismic data set. The system uses both Scholte wave and Guided-P wave dispersion characteristics to provide universal velocity structure information applicable to various marine engineering applications.
2Ease of manufacture
If single vertical component seismic data is used for dispersion inversion, then the processing is simpler, but dispersion modes may be misjudged and higher-order dispersion curves are lacking, resulting in lower inversion accuracy
Solution Approach 1:
The patent transitions from single vertical component seismic data to multi-component seismic data, adding horizontal component information. This dimensional enhancement enables better dispersion mode identification and provides access to higher-order dispersion curves that are not visible in single-component data, significantly improving inversion accuracy.
Solution Approach 2:
The patent implements an iterative inversion process where the inversion results are used to update the velocity model, which then feeds back into the dispersion curve calculation. This feedback mechanism allows for progressive refinement of the velocity structure model and accurate identification of dispersion modes through comparison of theoretical and observed dispersion curves.
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
This approach achieves comprehensive and high-resolution tomographic imaging of seabed shallow media velocities, providing crucial data for marine seismic data processing and foundation stability assessment in ocean engineering activities.
Implementation Method 1
the pressure excited by air-gun source can induce the generation and propagation of Guided-P wave and fluid-solid interface wave (i.e., Scholte wave)
Implementation Method 2
The two waves exhibit the dispersion characteristics that are sensitive to the changes in P-wave and S-wave velocities of seabed shallow media
Implementation Method 3
a comprehensive tomographic prediction of the velocity structures of subsurface layers from tens to several hundreds of meters below the seabed interface can be achieved via the dispersion inversions of Guided-P and Scholte waves
Data Source
AI summary
The disclosure provides a method and device for velocity tomography imaging of seabed shallow media, and electronic equipment. The method includes performing multichannel analyses of Guided-P and Scholte waves on seabed multi-component seismic gathers to determine measured multi-order dispersion curves of the two waves; based on a first seabed shallow media model and a theoretical dispersion equation of Guided-P wave, performing joint inversion of multi-order dispersion curves of Guided-P wave to iteratively update the P-wave velocity of seabed media; based on a second seabed shallow media model and a theoretical dispersion equation of Scholte wave, performing joint inversion of multi-order dispersion curves of Scholte wave to iteratively update the S-wave velocity of seabed media under the constraint of the P-wave velocity determined by the Guided-P wave dispersion inversion; and performing tomography imaging of seabed velocity structures with the inverted P-wave and S-wave velocities along a survey line.