The ultimate challenge for shear-waves is to deliver amplitudes in depth and imaging reliability of P-waves, for estimation of reservoir quality, geomechanical parameters for well completion, and 3D/4D fluid-pressure characterization. Coherent converted P- to S-wave (PS-wave) depth imaging, a comprehensive joint P-S velocity estimation (transverse-isotropy, TI) and shear-splitting correction to principal components could enable more accurate multi-mode P-S inversion for VP/VS ratio and bulk density from seismic. In this case study, we investigate the Lupin 3D9C survey in Midland basin for the technical reliability of PS-wave imaging in depth. An important goal is to establish a common-earth-model of velocity and anisotropy to provide inversion ready depth gathers for P- and S-wavefields (PS, SH, SV). Final anisotropy analysis amplitude maps for each mode show potential sensitivity to fractures, faults and stress field intensity. These maps are computed after shear-wave splitting (SWS) analysis, by differencing the fast and slow (S1– S2) stack for each shear-wavefield. These maps show an E-W lineament identifies a strike-slip fault, not observed in P-wave depth slices. These results, shared learnings and suggestions for improvements are discussed for shear processing, advancing S-wave depth imaging for all modes and amplitude interpretation, including rock property estimation.
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SEG/AAPG International Meeting for Applied Geoscience & Energy
August 28–September 1, 2022
Houston, Texas, USA
Shear-wave value for seismic imaging: Lupin 9C Seismic 3D Survey, Midland Basin, West Texas
James Gaiser
James Gaiser
Gaiser Geophysical Consulting
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Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, Houston, Texas, USA, August 2022.
Paper Number:
SEG-2022-w16-02
Published:
November 01 2022
Citation
Malcotti, Hermes, Dash, Ranjan, Davenport, James, Murphy, Gary, DiSiena, James, and James Gaiser. "Shear-wave value for seismic imaging: Lupin 9C Seismic 3D Survey, Midland Basin, West Texas." Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, Houston, Texas, USA, August 2022. doi: https://doi.org/10.1190/image2022-w16-02.1
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