Geometry of Clastic Injectites Network and Their Feeder—an Outcrop-Based Model
to Constrain Reservoir Modeling: The Example of the Vocontian Aptian and Albian
Fries, Gerard Olivier1, Olivier Parize2 (1) Institute Francais du Petrole, Rueil-Malmaison, France (2) Ecole des Mines de Paris, Fontainebleau, France
Massive sandstones are excellent hydrocarbon reservoirs deposited in turbiditic environment. However the original depositional geometries can be dramatically modified by large network of clastic injections (dykes and sills); The geometry and architecture of these network cannot be determined only from core analysis and seismic scale studies provide low-frequency images that need to be detailed and validated prior to reservoir simulation studies.
If turbidites, massive sands or clastic injectites outcrop examples are well-known, few of them give the opportunity to observe, within a well-constrained structural, sedimentary and litho- and chronostratigraphical context, simultaneously the channel feeder in visible connection with the injection network; moreover the quality of the outcrops need to be exceptional to make 3D field observations, in order to have comparable scales of observation from core, well and even to seismic data using GPR technics or high-resolution seismic acquisition.
The Vocontian Aptian and Albian outcrops belong to the category
of exceptional “reference” outcrops that can be used as analogues to build
full-scale geometrical model, constraining reservoir models. The Vocontian
This model is now a reference framework for outcrop and subsurface studies that can be used to visualize the clastic injectites network and the associated feeder and to test different hypothesis related to facies, geometry and internal architecture of the sand bodies.