Institut Francais Du Pe'trole

Institute Francais Du Petrole

William Sassi

Chakib Bennis

Renaud Divies

A Method for modeling, from an initial undeformed state, the evolution of a rock basin in the course of time taking into account a) the sliding along major tectonic discontinuities with internal deformation of sediments and at the same time b) mechanical compaction due to burial of sediments by tectonic deformation or sedimentation. After first subdividing the geological objects in the basin into a number of layers or banks by limits (stratigraphic discontinuities defining banks, faults defining imbricate structures, etc.) whose geometric positions are known, the banks are defining by grids. The tectonic deformation of each modeled layer is determined separately taking its thickness and length into account as far as possible, and the grids are modified to take into account the compaction associated with the degree to which the grid elements are buried. All the intermediate geometries of the evolution process are obtained incrementally. The model thus constructed gives information on the variation in permeability, expulsion of fluid by compaction, and heat transfers on the scale of the basin by circulation of fluids. The method has an application to finding underground hydrocarbon reservoirs.

Method for creating a 2D kinematic model of geological basins affected

The invention is a method applicable to a geologic structure, such as an oil bearing reservoir, defined from available data acquired either through measurements or through analyses and interpretations of seismic data or loggings performed in wells. The invention comprises previous modeling of the boundaries (zone edges, discontinuities or faults for example) by of triangulated surfaces enveloping as far as possible these boundaries and splitting up of the zone studied into blocks having at most six faces, whose faces correspond to discontinuities or main faults of the zone previously triangulated. Each block is thereafter subdivided into a set of elementary cells necessary for modeling the zone by finite elements or differences, by performing a gridding of each of the faces of the block by interpolation from the edges thereof so as to obtain a grid, followed by populating each block with nodes in the thickness thereof, by interpolation from the nodes of the various grids formed on the various faces, these operations being accompanied by particular homogenization procedures in order to readjust the size of the cells within each block according to predetermined rules. The gridded blocks are thereafter reassembled.

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Fourqueux, France

William Sassi