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Estimating Anisotropic Parameters Using Joint Tomographic Inversion - a Case Study from Offshore West Africa
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
Summary
Anisotropic parameter estimation is challenging for new exploration areas where there is no well data. In a 3000 km2 offshore survey from West Africa, we used surface seismic data in a non-linear tomographic inversion to simultaneously estimate migration interval velocity and anellipticity (η). Starting with an isotropic input model, joint tomography created a model of anellipticity. The anellipticity field computed without any well control was geologically plausible (structurally consistent) and the flatness of common image point gathers was significantly improved.
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