渤海湾盆地庙西凹陷烃源岩评价及油源分析

Study on hydrocarbon source rock characteristics and oil-source correlation in Miaoxi Depression,Bohaiwan Basin

运用精细的有机地球化学测试分析和综合对比古生标及油源参数,揭示庙西凹陷内及其周缘烃源岩和原油的地球化学特征,阐明庙西凹陷有效烃源岩展布规律及其与油气分布的关系。庙西凹陷北部主要烃源岩为东营组,有机质类型主要为Ⅱ1—Ⅱ2型,现今处于成熟生烃阶段;庙西凹陷中部主要烃源岩为沙河街组一段和沙河街组三段,有机质类型主要为Ⅱ1型;东营组在该区尚未成熟。庙西凹陷南部主要的烃源岩为沙河街组三段和沙河街组四段。有机质类型主要为Ⅱ1—Ⅱ2型,东营组也未成熟。庙西凹陷各组段有效烃源岩都为周边大—中型油气田的形成提供了重要的油源;与渤海湾盆地晚期成藏有很重要的关系,对其油气勘探具有一定的指导意义。

This paper revealed the geochemical characteristics of source rock and oil in Miaoxi Depression and near area, and clarified the distribution of effective source rock and its relationship with oil and gas, through careful organic geochemical test analysis and feasible formation of standard oil source parameters comparision. Main source rock is Dongying Fromation in northern part of Miaoxi Depression, and the organic is most II1-II 2 type which is mature and generating hydrocarbon. Source rock in the middle of Miaoxi Depression is Shahejie 1 Formation and Shahejie 3 Formation containing II 1 type organic matter. But Dongying Formation in this area is immature. South- em part of Miaoxi Depression, main source rock is Shahejie 3 Formation and Shahejie 4 Formation with II 1- II 2 type organic matter. Dongying Formation is immature too. West sag each formation of hydrocarbon source rocks in Miaoxi depression provides an important oil source guarantee for the surrounding large/medium formation of oil and gas fields.