临南洼陷油气藏分布特征与油气富集主控因素分析

Characteristics and Main Controlling Factors About Hydrocarbon Accumulation and Distribution in the Linnan Sag

临南洼陷具有良好的油气资源潜力,但随着油气勘探的逐渐深入,临南洼陷的勘探难度越来越大。为了更好的指导今后的油气勘探工作,在研究临南洼陷油气藏基本特征的基础上,从烃源岩、储集层、构造特征等多方面入手,总结油气藏分布特征和规律,分析油气富集成藏的主控因素,剖析各要素对油气富集的影响。结果表明,临南洼陷油气藏类型丰富,主要为断块油气藏及与断层有关的复合油气藏,油气藏主要分布在馆陶组、沙二段和沙三段。临南洼陷油气藏平面上主要分布在临商断裂、夏口断裂及其伴生构造带上,呈环状分布;浊积扇、冲积扇及河流沉积是油气藏分布的主要沉积类型;其富集主要受烃源岩、沉积相、断层等因素控制。油气藏受烃源岩控制围绕生油洼陷展布;有利沉积相带在平面上连续展布,纵向上叠置连片,具有良好的储集条件;断层作为油气的运移通道控制油气的运移,并与地层产状、构造等相配合形成圈闭,控制油气的聚集。

Linnan Sag is the most important oil and gas sag in Huimin Dcpression. With the development of exploration, the difficuhy of exploration is increasingly growing in l,innan Sag. Based on study of the essential characteristics of oil and gas reservoirs and summarization of the distribution features and rules, main controlling factors of reservoirs in Linnan Sag were analyzed for oil and gas exploration in the future. There are various petroleum reservoir types in Linnan Sag, and the sag is dominated by fault-block reservoir and composite reservoir about fault. Reservoirs are mainly distributed in turbidite fan facies, alluvial fan facies, and fluvial facies. According to the study, the distribution and accumulation of petroleum reservoirs is mainly controlled by source rocks, sedimentary facies belts, and faults in l,innan Sag. Petroleum reservoirs are controlled by hydrocarbon sonree rocks and distributed SmTounding the oil- generating sag. Because the favorable of sedimentary facies behs are continuously overlapped, they are well reservoir beds. Faults not only control the hydrocarbon migration pathways, but also control the hydrocarbon accumulation by trapping with formations and structures.