Petroleum System Study for the Aradeiba and Bentiu Plays, Block 4
Idris, Kamil1, Ahmed Mahgoub1,
Omer Ibrahim1, Ajay Kumar1, Pierre-Yves Chénet2,
Alain Bruneton2, Michel Pernelle2 (1) GNPOC,
Block 4 has been relatively immaturely explored and presented itself as a technical challenge to the operating company. A team from Greater Nile Petroleum Operating Company (GNPOC) and BEICIP-FRANLAB, has conducted an Integrated Petroleum System Study on an area of 23,000 km2 for the two main Upper Cretaceous Plays, namely the Aradeiba and Bentiu Plays. The study comprised a stratigraphic and structural model building for seven key horizons. The study has been conducted on a 3D block comprising up to 43 layers from “Abu Gabra” to surface. After building the thermal and maturity model, the hydrocarbon charging has been studied along 2D seismic sections using Temis 2D® software. The HC generation occurs over short periods, and is governed by the nature of the organic matter (lacustrine) and main heating events related to rifting. Amount of hydrocarbon expelled was determined and this allowed defining a migration efficiency of 1-5% for the Bentiu and 1% for the Aradeiba. The plumbing system consists of normal faults and permeable sands which allow for complex distribution of accumulations over the plays. Using a probabilistic approach and 3D map based HC migration system, hydrocarbon charging for 10 catchment areas was determined using Temis 3D® software. This presentation will discuss results of the study and results of the subsequent exploration.