--> Abstract: Characterization And Modeling Of The Carboniferous Reservoir D2 Of Edjeleh Field, Algeria, by A. Benbakir and H. Mammeri; #90928 (1999).

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BENBAKIR, A., and H. MAMMERI
Petroleum Engineering and Development of Sonatrach

Abstract: Characterization and Modeling of the Carboniferous Reservoir D2 of Edjeleh Field, Algeria

The pressure maintenance program using water injection in the Edjeleh field needed a geologic model. Considering the complexity of the depositional model in the lower Visean of Edjeleh field, sequence stratigraphy was used in order to have a reliable sedimentary division and a better characterization of the reservoirs (D2 and D4). Two sequences of the 4th order (Vail, 1987) have been defined. Each sequence of deposits is composed of two systems.

The first system includes deposits of the basal part of the reservoir D4, which corresponds to a Lowstand Systems Tract. The second system includes the upper part of the reservoir D4 and corresponds to a Transgressive Systems Tract. The third system includes the basal part of the reservoir D2 and corresponds to Highstand Systems Tract deposits. This latter is composed of six parasequences (bars). The fourth one includes the upper part of the reservoir D2 and corresponds to a Lowstand Systems Tract deposit. Three parasequences (channels) have been defined in this sequence. These different parasequences constitute the layers of the reservoir D2.

The upper layer of the Lowstand Systems Tract shows better reservoir qualities. The spatial evolution of these layers shows a thickening and amelioration of petrophysical characteristics in the southern part of the studied area.

AAPG Search and Discovery Article #90928©1999 AAPG Annual Convention, San Antonio, Texas