3D
Stratigraphic Modelling in Complex Tectonics Area
Granjeon, Didier1, Sylvie Wolf2
(1) Institut Français du Pétrole,
Thanks to the recent developments in
geoscience tools, relationship between tectonics, sedimentation and petroleum
systems can be investigated. This presentation is focused on these numerical
models and in particular on the principles and use of Dionisos in integrated
basin studies in complex tectonics area.
A Dionisos simulation is performed from
the past up to the present taking into account three main geological «
processes » : accommodation, supply and transport. The
creation of accommodation is defined by eustatic sea-level variations and
tectonic deformation, either purely vertical (thermal subsidence, sediment loading, ...), or more complex, induced by growth faults and
salt diapirs. The supply of sediment may be a clastic inflow introduced into
the basin by rivers, or a carbonate growth in marine environments controlled by
water depth, wave energy and ecology. Finally, sediments may be transported
through out the basin by long-term and short-term gravity processes
(water-driven diffusion model), and reworked in nearshore environments by
marine currents.
This stratigraphic model,
and its link with basin model and uncertainty tools, are illustrated with an
application on an active margin, where growth faults and sedimentary processes
interact, and control reservoir and seal properties, but also overpressure.
This application shows us that this link between structural, stratigraphic and
basin models is a dreamed key to decipher the stratigraphic records in
synkinematic series and better understand the source to sink systems, although
great scientific effort still have to be put on their developments to close the
process-deposit loop in complex tectonic settings.
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California