Coupled-domain acoustic-elastic solver for anisotropic media: A mimetic finite difference approach
- Harpreet Singh (Colorado School of Mines) | Jeffrey Shragge (Colorado School of Mines) | Ilya Tsvankin (Colorado School of Mines)
- Document ID
- Society of Exploration Geophysicists
- SEG International Exposition and Annual Meeting, 15-20 September, San Antonio, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Exploration Geophysicists
- Modeling, 2D, Anisotropy, Finite difference, Fluid
- 7 in the last 30 days
- 9 since 2007
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With the emergence of the new multi-component (4C) ocean bottom sensor technology, it is now possible to record seismic wavefields at the ocean bottom. However, the recorded horizontal velocity components are often disregarded in practice due to the data complexity and problems in accurately modeling the full wavefield. One potential cause of the latter issue is the improper handling of fluid-solid interface condition during seismic modeling. To address these challenges, we develop a mimetic finite-difference (MFD) approach to correctly implement the fluid-solid boundary condition. Instead of using a single global model domain, we employ two subdomains, where one represents an acoustic medium and the second elastic (anisotropic) medium. We use a split-node approach to distribute grid points at the interface and one-sided MFD operators to satisfy explicit boundary conditions to couple the acoustic-elastic physics. Numerical examples show that a higher-order implementation of the interface conditions can be achieved with the same order of spatial accuracy as that for the interior using MFD operators, and that the resulting wavefields can provide insights into the wave phenomena closely associated with the fluid-solid sea floor interface.
Presentation Date: Monday, September 16, 2019
Session Start Time: 1:50 PM
Presentation Start Time: 4:20 PM
Presentation Type: Oral
|File Size||1 MB||Number of Pages||5|
de Hoop,A. T., andJ. H.,Van der Hijden,1984,Generation of acoustic waves by an impulsive point source in a fluid/solid configuration with a plane boundary:The Journal of the Acoustical Society of America,75,1709–1715,doi:10.1121/1.390970.
Farfour,M., andW. J.,Yoon,2016,A review on multicomponent seismology: A potential seismic application for reservoir characterization:Journal of Advanced Research,7,515–524,doi:10.1016/j.jare.2015.11.004.
Kaser,M., andM.,Dumbser,2008,A highly accurate discontinuous galerkin method for complex interfaces between solids and moving fluids:Geophysics,73,T23–T35,doi:10.1190/1.2870081.
Komatitsch,D.,C.,Barnes, andJ.,Tromp,2000,Wave propagation near a fluid-solid interface: A spectral-element approach:Geophysics,65,623–631,doi:10.1190/1.1444758.
Kugler,S.,T.,Bohlen,T.,Forbriger,S.,Bussat, andG.,Klein,2007,Scholte-wave tomography for shallow-water marine sediments:Geophysical Journal International,168,551–570,doi:10.1111/j.1365-246X.2006.03233.x.
Levander,A. R.,1988,Fourth-order finite-difference P-SV seismograms:Geophysics,53,1425–1436,doi:10.1190/1.1442422.
Padilla,F.,M.,de Billy, andG.,Quentin,1999,Theoretical and experimental studies of surface waves on solid–fluid interfaces when the value of the fluid sound velocity is located between the shear and the longitudinal ones in the solid:The Journal of the Acoustical Society of America,106,666–673,doi:10.1121/1.427084.
Robertsson,J. O., andA.,Levander,1995,A numerical study of seafloor scattering:The Journal of the Acoustical Society of America,97,3532–3546,doi:10.1121/1.412439.
Rojas,O.,S.,Day,J.,Castillo, andL. A.,Dalguer,2008,Modelling of rupture propagation using high-order mimetic finite differences:Geophysical Journal International,172,631–650,doi:10.1111/j.1365-246X.2007.03651.x.
Shragge,J., andB.,Tapley,2017,Solving the tensorial 3D acoustic wave equation: A mimetic finite-difference time-domain approach:Geophysics,82,T183–T196,doi:10.1190/geo2016-0691.1.
Virieux,J.,1986,P-SV wave propagation in heterogeneous media: Velocity-stress finite-difference method:Geophysics,51,889–901,doi:10.1190/1.1442147.