Structures and Hydrocarbon Accumulation in Fula Sag of Muglad Basin in Central Africa

Fula sag is located in northwestern Muglad basin of Sudan Republic in Central Africa. The rift sag dominated by Mesozoic deposits was formed under the setting of shear stress field in Central African shear belt. Its fault activity can be divided into three phases, namely Early Cretaceous, Late Cretaceous and Paleogene, which form two groups of faults in trends of N-S and NW-SE. The frame of Fula structure is controlled by N-S fault and the growth of second-rank structural belt within this sag by NW-SE fault. It is indicated from the structural controlling effects in Fula sag on its oil-gas reservoirs that the structural trans-zone could be as the hydrocarbon enrichment zone, the multi-cycle structural subsidence may shape the favorable reservoir-caprock assembages and the structural slope could be the favorable area of hydrocarbon accumulation.