中非乍得D盆地下白垩统烃源岩特征与资源潜力研究OA

The Lower Cretaceous of the D Basin of Chad in Central Africa developed mudstone source rocks.To promote oil exploration in this basin,it is necessary to deepen the understanding of the characteristics and resource potential of the source rocks.The character-istics and resource volume of the source rocks in the basin were studied by means of core observation,rock pyrolysis,total organic car-bon,and vitrinite reflectance.The results indicate that the organic matter abundance is high in the lower part of the Albian Stage,Aptian Stage and Barremian Stage,with TOC of mud shale ranging from 0.88%to 3.55%,rock pyrolysis hydrocarbon generation index is 150～700 mg/g,and organic matter types classified as Type I and TypeⅡ1.The organic matter in the Albian Stage is immature,while that in the Aptian and Barremian Stages is at low mature to mature stage.The thermal evolution degree of organic matter in D basin is in the immature to mature stage as a whole,and has not yet reached the peak of oil generation.The oil generation window of the basin be-gan at 2 050～2 100 m.The oil and gas resources of Aptian and Barremian source rocks in the basin were calculated by using the organ-ic carbon material balance method,and the cumulative resource is2.48×108 t.The determination of this resource quantity provides a reference for risk assessment of foreign oil and gas cooperation blocks,and plays a positive role in China's energy supply and demand environment.