--> Abstract: 3D Geological Modelling of Algerian Glacial Ordovician Reservoirs; #90063 (2007)

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3D Geological Modelling of Algerian Glacial Ordovician Reservoirs

 

Dauphin, Léna1, Guy Desaubliaux2, Angélique Martin1, Laurent Escaré1, Eric Portier1 (1) Gaz de France, Saint Denis La Plaine, France (2) Institut Français du Pétrole, 92852 Rueil Malmaison Cedex, France

 

One of the key challenges in the exploration and exploitation of hydrocarbon reservoirs lies in a detailed and realistic understanding of the shape, size and spatial distribution of the reservoir and non-reservoir subsurface features.

 

A 3D geological model of the silicoclastic Cambro-Ordovician reservoirs of an Algerian gas field was built for reservoir simulation and reserves estimation purposes. This model is based on the integration of all available seismic and well data, as well as outcrop analogue models.

 

To build such a realistic 3D model, geological knowledge of the sedimentary architecture is fundamental. The Ordovician reservoirs are made of glacial to periglacial deposits organised in several erosive units. The sedimentological study was performed in collaboration with IFP (Institut Français du Pétrole) and is presented in an associated poster (proposed for Theme V / P-37 Session).

 

Data inputs for the geocellular model consist in standard structural and reservoir unit thickness maps, but also more specific sedimentary facies distributions, well correlations and geometrical organisation typical of glacial deposits. Simulation methods were also used to produce a deterministic base case that fits both the subsurface data and the sedimentological model.

 

Petrophysical ranges associated to each unit or facies, and deduced from core and log data, appear to be clearly related to the deposit features themselves. This point confirms that the sedimentological model remains a key driver to the understanding of these reservoirs, and also brings valuable QC to the "hard" and "soft" data integration.

 

AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California