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- W2051178412 abstract "With the increasing interest in ever more detailed reservoir evaluation, including possible small scale structure which manifests itself on a macroscopic scale as anisotropy to seismic wave propagation, there is a need for inversion algorithms which can handle anisotropic materials. Here, we present a linearized inversion algorithm of 3D seismic reflection data for reconstructing anisotropic background media and for inverting amplitude variations with offsets and azimuths. The inversion of amplitude variations with offsets and azimuths is posed as determining the elastic parameters of an inclusion present in a smooth depth dependent anisotropic medium for which appropriate Green’s tensors can be constructed. The inclusion may be arbitrarily mogeneous and anisotropic in its elastic behaviour. Based on this linearized inversion algorithm and using the hierarchical reconstruction technique, we propose the following strategy for reconstructing the anisotropic background media. Similar to seismic amplitude variations with offset and azimuth, the phase factor (which controls the travel times in this formalism) varies with dip and azimuthal angles. First, we seek an isotropic background medium using small dip angles and near zero azimuthal angle. Secondly, we seek an azimuthal isotropic background where the isotropic velocity obtained in the first step is used as vertical velocity of the azimuthal isotropic background. In the third step we seek azimuthal anisotropic variations of background as perturbations from the azimuthal isotropic model." @default.
- W2051178412 created "2016-06-24" @default.
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- W2051178412 date "1994-01-01" @default.
- W2051178412 modified "2023-10-05" @default.
- W2051178412 title "3‐D linearized inversion: Anisotropic background reconstruction and azimuthal amplitude inversion" @default.
- W2051178412 cites W2146115179 @default.
- W2051178412 doi "https://doi.org/10.1190/1.1932048" @default.
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