Joint PP and PS anisotropic AVO inversion using exact Zoeppritz equations
- Yifei Bao (Seismic Anisotropy Group, Department of Geosciences, the University of Tulsa) | Jingyi Chen (Seismic Anisotropy Group, Department of Geosciences, the University of Tulsa) | Xiaobo Liu (Seismic Anisotropy Group, Department of Geosciences, the University of Tulsa) | Zhencong Zhao (Seismic Anisotropy Group, Department of Geosciences, the University of Tulsa) | Mengxiu Wang (Seismic Anisotropy Group, Department of Geosciences, the University of Tulsa) | Fuping Liu (Beijing Institute of Graphic Communication)
- 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
- AVO/AVA, Inversion, Anisotropy
- 2 in the last 30 days
- 2 since 2007
- Show more detail
Various approximations of the Zoeppritz equations, based on the assumptions of weak contrast boundary and small incident angle, are widely used in conventional AVO inversion. These approximations not only limit the scope of application, but also reduce the result accuracy. In addition, with the situation that the reservoir structure becomes more and more complex, isotropic medium cannot accurately describe the subsurface of the earth. Therefore, we develop a joint PP and PS (using more available seismic information) anisotropic AVO inversion method using the exact Zoeppritz equations. We introduce the Rüger approximations to describe the anisotropic feature. During the implementation of least-squares inversion, we conduct the Marquardt method to ensure the stability of our inversion. In addition, we use the analytical solution to calculate the gradients of the reflection coefficients with respect to rock properties, which can speed up the inversion process. Finally, we use a synthetic seismic test to verify our method. The outputs are the elastic parameters (P- and S-wave velocities, density) and Thomsen parameters (ε and δ). The inversion results indicate that our new method is more accurate than conventional method for anisotropic medium.
Presentation Date: Monday, September 16, 2019
Session Start Time: 1:50 PM
Presentation Time: 2:40 PM
Location: Poster Station 8
Presentation Type: Poster
|File Size||394 KB||Number of Pages||5|
Auger,E.,J.Virieux, andA.Zollo,2003,Locating and quantifying the seismic discontinuities in a complex medium through the migration and AVA analysis of reflected and converted waves: An application to the Mt Vesuvius volcano:Geophysical Journal International,152,486–496, doi:10.1046/j.1365-246X.2003.01864.x.
Backus,G. E.,1962,Long-wave elastic anisotropy produced by horizontal layering:Journal of Geophysical Research,67,4427–4440, doi:10.1029/JZ067i011p04427.
Booth,A. D.,E.Emir, andA.Diez,2016,Approximations to seismic AVA responses: Validity and potential in glaciological applications:Geophysics,81,no.1,WA1–WA11, doi:10.1190/geo2015-0187.1.
Bortfeld,R.,1961,Approximations to the reflection and transmission coefficients of plane longitudinal and transverse waves:Geophysical Prospecting,9,485–502, doi:10.1111/j.1365-2478.1961.tb01670.x.
Buland,A., andH.Omre,2003,Bayesian linearized AVO inversion:Geophysics,68,185–198, doi:10.1190/1.1543206.
Carcione,J. M.,D.Kosloff, andA.Behle,1991,Long-wave anisotropy in stratified media: A numerical test:Geophysics,56,245–254, doi:10.1190/1.1443037.
Hampson,D.,1991,AVO inversion, theory and practice:The Leading Edge,10,no.6,39–42, doi:10.1190/1.1436820.
Liu,X. B.,F. P.Liu,X. J.Meng, andJ. Q.Xiao,2012,An accurate method of computing the gradient of seismic wave reflection coefficients (SWRCs) for the inversion of stratum parameters:Surveys in Geophysics,33,293–309, doi:10.1007/s10712-011-9149-8.
Lu,J.,Y.Wang,J.Chen, andY.An,2018,Joint anisotropic amplitude variation with offset inversion of PP and PS seismic data:Geophysics,83,no.2,N31–N50, doi:10.1190/geo2016-0516.1.
Marquardt,D. W.,1963,An algorithm for least-squares estimation of nonlinear inequalities:Journal of the Society for Industrial and Applied Mathematics,11,431–441, doi:10.1137/0111030.
Ostrander,W. J.,1984,Plane-wave reflection coefficients for gas sands at non-normal angles of incidence:Geophysics,49,1637–1648, doi:10.1190/1.1441571.
Shuey,R. T.,1985,A simplification of the Zoeppritz equations:Geophysics,50,609–614, doi:10.1190/1.1441936.
Thomsen,L.,1986,Weak elastic anisotropy:Geophysics,51,1954–1966, doi:10.1190/1.1442051.
Veire,H. H., andM.Landrø,2006,Simultaneous inversion of PP and PS seismic data:Geophysics,71,no.3,R1–R10, doi:10.1190/1.2194533.