Joint pre-stack stratigraphic inversion and facies analysis on a Brazilian deep offshore field

We present in this paper an integrated workflow to extract key parameters from seismic angle sub-stacks in a reservoir characterization purpose. The workflow consists in three main steps. First, from seismic angle sub-stacks and well log data, we use a multi-well and multi-angle calibration technique to extract one wavelet per angle sub-stack. Second, we use a joint stratigraphic inversion method to retrieve elastic parameters (density, P- and Simpedances) rom the seismic angle sub-stacks. This method is a model-based inversion, which allows to integrate a priori geological knowledge in the impedance retrieving process. To compute synthetic angle substacks from the elastic parameter model in the inversion process, we use the Aki-Richards equations, which are<br>linear approximations of the Knott-Zoeppritz full-wave equations. Finally, we present the methodology for a qualitative interpretation of the P- and S-impedances into seismic facies. This integrated workflow is applied to a real case-study: the interpretation of pre-stack seismic data from a Brazilian deep offshore field.