ELASTIC FULL WAVEFIELD INVERSION WITH REFINED ANISOTROPY AND VP/VS MODELS

摘要

Methods for inversion of seismic data to infer subsurface physical property parameters, comprising constructing an inhomogeneous anisotropy model and/or inhomogeneous V_S/V_P or V_P/V_S model; and inverting the seismic data in a sequential or simultaneous approach to obtain at least one subsurface physical property parameter using an elastic inversion algorithm and the inhomogeneous anisotropy model and/or inhomogeneous V_S/V_P or V_P/V_S model. Constructing an inhomogeneous anisotropy model may comprise deriving geobodies from at least one of seismic facies analysis, regional geologic information, or seismically derived earth models; and adjusting at least one of ε, δ, γ, or parameters of the elastic stiffness tensor matrix in a homogeneous anisotropy model in areas corresponding to the geobodies. Constructing an inhomogeneous V_S/V_P or V_P/V_S model may comprise deriving geobodies and adjusting values in a homogeneous V_S/V_P or V_P/V_S model in areas corresponding to the geobodies.