2018 - North Africa Petroleum Exhibition and Conference
Rebecca Smith, Meriem Bertouche and Andrea James - Refining static models through an integrated approach to reservoir description: a case study from the fluvially-dominated Triassic Argilo-Gréseux Inférieur (TAGI) Formation, Berkine Basin, Algeria
A multi field-scale study of the Trias Argilo-Gréseux Inférieur (TAGI) Formation of the Berkine Basin, Algeria evaluating new and existing core, borehole image (BHI), wireline log, reservoir quality and production data, across 53 wells from Blocks 401/402 has allowed for a detailed investigation into the depositional evolution, resulting in the division of the TAGI into nine mapping layers. These layers best capture the large-scale variations in depositional and reservoir architecture. Within this sedimentological framework, the internal heterogeneity is captured through the evaluation of the plug-scale controls on reservoir quality, complemented by a detailed petrographical evaluation. The controls on reservoir quality include grain size, mud content and dolomite cementation. Evaluation in terms of the wireline log characteristics has established ranges in reservoir quality based on variations in the gamma ray (mud content and grain size) and bulk density response (% dolomite cements) respectively, thereby providing likely reservoir characteristics in the absence of conventional core analysis that are more intuitive than those based solely on log algorithms.