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Depositional Environment and Previous HitReservoirNext Hit Architecture of the Carboniferous Section in RKF Field, Berkine Basin, Algeria

N. Sabaou1, N. Connolly1, T. Bartrina2, A. Alaminos2, A. James1, N. Adamson1, G. Paintal1, and N. Alem3
1 Badley Ashton and Associates Ltd, Horncastle, Lincolnshire, United Kingdom
2 CEPSA, Spain
3 CRD-Sonatrach, Algeria

Sedimentological, diagenetic and palynological description of the Carboniferous section (RKF Sands) was carried out on one RKF well. This study allows an improved understanding of the depositional environments and the architecture of the Previous HitreservoirNext Hit, along with its Previous HitqualityNext Hit (diagenetic effects) and age. These data will be important in 3D modelling.

The Rhourde El Krouf (RKF) oil Field was discovered in 1992 by the Sonatrach/Cepsa Association. It is situated in the Berkine Basin of eastern Algeria. This field has two Previous HitreservoirNext Hit units, the TAGI (Trias Argilo-Grèseux Inférieur), and the Carboniferous sections. The Carboniferous Previous HitreservoirNext Hit has been described as a multi-layer system of shallow marine sandstone beds interbedded with silty-shale intervals containing thin organic-rich shales. The sand sequences may constitute vertically isolated Previous HitreservoirNext Hit units with different hydrocarbon composition and hydrocarbon/water contacts. The main objective of the study was to capture the various oil and gas-condensate reservoirs within the Carboniferous RKF Sands to understand the Previous HitreservoirNext Hit architecture and possible Previous HitqualityNext Hit of the different sand-bodies. The link between depositional environment and Previous HitreservoirNext Hit Previous HitqualityNext Hit (diagenetic effects) is an important issue to allow effective 3D Previous HitreservoirNext Hit modelling.

The studied interval is considered to comprise bioturbated coastal shallow marine/estuarine deposits and offshore deposits. The cored section has been rationalised into 15 lithotypes that group into 9 facies associations.

The best Previous HitreservoirNext Hit Previous HitqualityTop is to be found where chlorite cementation is 'balanced' - enough chlorite to form sufficiently continuous and thin grain-coats, but not enough to fill pores or restrict pore throats too severely.