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Shear-wave splitting in anisotropic media

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Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17245866
.... Shear-wave splitting theory in orthotropic media Orthotropic media are formed from an orthogonal combination of an HTI anisotropic medium and a VTI anisotropic medium. In order to study the shear-wave splitting phenomenon in orthotropic media, we convert orthotropic media into equivalent HTI media where...
Proceedings Papers

Paper presented at the 1991 SEG Annual Meeting, November 10–14, 1991
Paper Number: SEG-1991-0051
... dotted line upstream oil & gas orthogonal principal time series linear transform edinburgh anisotropic project splitting Linear-Transform Techniques for Analyzing Shear-Wave Splitting in Four-Component Seismic Data Xiangyang Li* and Stuart Crampin, Edinburgh Anisotropic Project, British...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-0174
.../San Antonio 2007 Annual Meeting A S-wave splitting study Shear-wave splitting study Closely spaced parallel fractures behave like an anisotropic medium in the seismic frequency band. The type of anisotropy induced by the fractures depends on a number of factors, namely fracture type (rotation- ally...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5853299
... anisotropic or fractured media, unlike compressional (P) waves, shear waves are characterized by having different polarization into fast and slow shear waves. Shear waves propagating in anisotropic medium are called inline (SV) and cross-line (SH) (Crampin, 1981; Alford, 1986). The SV-wave is polarized in the...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–12, 2005
Paper Number: SPE-95654-MS
... characterization propagation saturation seismic anisotropy stiffness flow model anisotropic media fanchi SPE 95654 Petrophysical Model of Split Shear Waves in Anisotropic Media J.R. Fanchi, Colorado School of Mines Copyright 2005, Society of Petroleum Engineers This paper was prepared for presentation...
Proceedings Papers

Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-0960
... ABSTRACT No preview is available for this paper. vp 3 seg Shear-wave splitting at vertical incidence in media con taining intersecting fracture systems Jaime Ramos-Mart nez , Andrey A. Ortega, and George A. McMechan, Center for Lithospheric Studies, The University of Texas at...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-1858
... angle frequency shapiro shear-wave splitting intrinsic anisotropy medium fluctuation ST 14.8 Frequency-dependent shear-wave splitting in thinly layered media with intrinsic anisotropy Ulrich Werner and Sergei A. Shapiro, WIT Group, Karlsruhe University, Germany Summary Seismic wave propagation...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-1019
... of the converted-wave as well as the presence of vertical transverse isotropy (VTI) in the background sand- shale sequence, which gives rise to strong non-hyperbolic moveout in the prestack data. Therefore, successful anisotropic processing not only needs to preserve shear- wave splitting, but also...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0004
... internal refrac- tion cones, multiple shear-wave splitting in homo- geneous anisotropic media, and the possibility that the slow shear-waves propagate with greater group velocities than the fast shear-waves along some spa- tial directions. Data-processing algorithms handling those complexities are expected...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-3415
... establishes its principal directions, or symmetry axes, by performing Alford rotations with trial angles until the diagonal components of the VSP are maximized (Alford, 1986). Then, the maximized diagonal components are analyzed for fast- and slow-shear wave velocities (shear-wave splitting) in the top layer...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-1635
... wave motion in anisotropic and cracked elastic media : Wave Motion, 3, no. 4, 343 391, doi:10.1016/0165-2125(81)90026-3. Crampin, S., and S. Chastin , 2000, Shear-wave splitting in a critical crust: II- compliant, calculable, controllable, fluid-rock interactions, in Anisotropy 2000: Fractures...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-0881
... orientation artificial intelligence birefringence analysis equation seg houston 2005 reservoir characterization anisotropic layer birefringence effect fracture orientation optimization problem azimuthal anisotropy Shear-wave splitting analysis using simulated annealing H. Dariu*, P.Y. Granger and...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426574
... (r, z0, s) = p YY (r, z0, s) = 2n C kn(r, z0, s). (7) (b) k=odd(>0) Figure 2: Explanation of the shear wave splitting in terms of the principal fast CnF and slow CnS cylindrical waves, where To extend these results to HTI media, we assume that in such the X-multipole source is (a) aligned with the...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0216
... gorshkalev Cross-correlation-function method for separation of shear waves S1 and S2 in azimuthally anisotropic media and an example of its application with real data Chichinina T Instituto Mexicano del Petroleo, Obolentseva I. , Gorshkalev S. , and Karsten W., Trofimuk Institute of Petroleum Geology and...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-4284
.... Introduction In isotropic media, converted waves are generally polarized in the plane of propagation, and it is common to process the radial data as the P-SV data . In the presence of azimuthally anisotropic media, shear wave propagation is complicated by the phenomenon of shear-wave splitting, whereby the SV...
Proceedings Papers

Paper presented at the 1987 SEG Annual Meeting, October 11–15, 1987
Paper Number: SEG-1987-0918
... analysis Laboratory Observations of Shear Wave Propagation in Anisotropic Media C S. Rai and C. H. Sondergeld, Amoco Production Co. Results of systematic laboratory study involving shear wave propagation in aniso- tropic rocks demonstrate a number of fea- tures which are, without exception, in excellent...
Proceedings Papers

Paper presented at the 1992 SEG Annual Meeting, October 25–29, 1992
Paper Number: SEG-1992-0124
... examine the mechanism of anisotropy and to understand the characteristic of shear-wave propagation in anisotropic media. The data set contained nine-component VSPs (three-component source and three-component receiver), and was recorded at one near-offset and two orthogonal far-offsets. The data display...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427764
... The introduction of the ocean-bottom sensor technology has made it possible to record multicomponent (4C) seismic wavefields at the sea floor. However, conventional elastic finitedifference (FD) algorithms treat the water as a solid with zero shear-wave velocity, which results in incorrect...
Proceedings Papers

Paper presented at the 1999 SEG Annual Meeting, October 31–November 5, 1999
Paper Number: SEG-1999-0973
...-wave propagation at normal incidence to split into fast and slow shear waves. We have presented analytic descrip- tions for the quadratic (A 2 ) and quartic (A 4 ) coe cients of the Taylor's series expansion of the two-way trav- eltime for both shear-waves in azimuthally anisotropic media, with special...
Proceedings Papers

Paper presented at the 1986 SEG Annual Meeting, November 2–6, 1986
Paper Number: SEG-1986-0391
... velocities, where the polarizations and ve- locities are fixed for the particular raypath through the anisotropic material. In the weak anisotropy expected in crustal rocks, there will usually be two split shear waves with velocities differing by a few percent and polarizations that are within ~20 degrees of...

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