A New Automated 3D Seismic Stratigraphic Methodology

摘要

Seismic stratigraphic interpretation is a powerful method for analyzing the depositional history of the subsurface. However, the lack of support of such interpretation methods in the state-of-the-art tools limits its application. A novel technology allowing a highly automated procedure for seismic stratigraphic interpretation is presented. The technology includes an automated high resolution extraction step of all the stratigraphic primitives. The technology supports a “dual domain” concept that enables to interpret transparently in the seismic domain and the chronostratigraphic time domain. The interpreter controls this mapping by selecting the appropriate set of stratigraphic primitives to define this transformation. The high resolution extraction step is based on Borgos et al., 2003, 2005. The output from this classification results in extrema patches from which the stratigraphic primitives are defined. The method can be extended to active tectonic basins by including fault patches in the mapping (Pedersen et al., 2003, 2005). To demonstrate the potential of this new methodology we have applied it to an offshore Brazil case. The extracted stratigraphic surfaces are built from merged extrema patches. The obtained stratigraphic primitives refine the geological model and allow to accurately place the compartment boundaries and identify presence of hydrocarbons.