Imaging Attenuation in Rock with Heterogeneous Multiphase Fluids
Kurt T. Nihei, S. Nakagawa, and T. Watanabe
Contact: Kurt T. Nihei, 510/486-5349, KTNihei@lbl.gov
Research Objective
At the center of this project is a fundamental investigation of scattering and intrinsic attenuation of seismic waves in rock with heterogeneous distributions of fluids and gas. This research represents a departure from past rock-physics studies on seismic attenuation, in that the emphasis here is not on a detailed study of a specific attenuation mechanism. Rather, the emphasis is on investigating theoretical and laboratory methods for obtaining separate estimates of scattering and intrinsic attenuation in rock with heterogeneous pore fluid distributions. We anticipate that methods for obtaining separate estimates of intrinsic and scattering attenuation may lead to higher-resolution methods for monitoring the movement of fluids in the subsurface.
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 Snapshot of the pressure field generated by a 100 Hz pressure source located in the lower left corner of a homogeneous medium with a single fracture, located in the middle of the model. An anisotropic, viscoelastic, time-domain staggered grid was used in this computation.
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