Abstract
Abstract In this paper it is stated that, for the purpose of modelling and interpretation with the help of inversion, the elastic wave-equation is the correct way to link seismic data to the properties of the subsurface, through which the seismic waves are propagating. For Amplitude vs. Offset modelling/inversion the 1.5D data model is used and, therefore, also the elastic wave-equation is presented in this domain. The parameterization of the isotropic elastic wave-equation is directly in terms of elastic moduli, or compliances, which are closer to the desired reservoir properties than the conventional impedances. An iterative solution of the wave-equation is presented. It is demonstrated that the wave equation-based inversion contributes to increased interpretability, particularly in terms of hydrocarbon saturation of the reservoirs. Compared with the results from conventional linearized primary reflectivity-based inversion, it turns out that the wave equation-based method produces property results with a wider spatial bandwidth, due to the fact that it honours all internal multiple scattering and mode conversions generated over the target interval.
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