Proposed Workflow to Incorporate Stratification within Salt Section Using Velocity and Seismic Attributes
M. González, F. Gobatto, A. Maul, L. Falcão, G. González, L.C. Oliveira, T. Meneguim and P.J. Amaral
Event name: Third EAGE/SBGf Workshop 2016
Session: Poster Session I
Publication date: 06 April 2016
Info: Extended abstract, PDF ( 2.27Mb )
Price: € 20
Beyond time-to-depth conversion purposes, building a more realistic seismic velocity model is fundamental to provide proper inputs for seismic processing and imaging, quantitative seismic interpretation, illumination studies, geomechanical analysis, facies studies and uncertainties analysis. The Pre Salt reservoirs in the Brazilian offshore (Campos and Santos basins) are plays underlying a structurally complex area due to multiple factors, as the presence of the salt section above them, imposing several challenges regarding the amplitude response. Therefore, it makes necessary the evolution of the standard way to build velocity models, including a strong geological approach, in order to consider specific characteristics, as stratified layers inside the referred salt section, once it should influence the quality of the seismic response and its usage for reservoir characterization involving property distribution. For that reason, a new methodology is presented, based in a recursive workflow, to generate a robust geologic velocity model. This model is improved in every cycle step and each result becomes a new input for the next one. It takes into account the lithological heterogeneity of the salt section and the position of the stratifications to better represent the seismic velocities in the subsurface.