广利油田沙四上亚段成藏地质特征与勘探方向

广利油田位于东营凹陷中央隆起带东端南翼,根据地质特征及测井剖面的综合分析,认为该区沙四上亚段发育了辫状河三角洲前缘沉积,辫状河道和前缘砂坝共同控制了辫状河三角洲前缘砂体的形态展布.辫状河道砂体和前缘砂坝砂体是广利油田的优质储层.广利油田西部的牛庄洼陷有沙三中、下亚段和沙四上亚段2套烃源岩,特别是沙四上亚段的油页岩可以为广利油田提供充足的油气.广利油田鼻状构造和辫状河三角洲前缘砂体的良好配置是油气聚集成藏的关键因素,鼻状背斜的西翼是广利油田下一步勘探的有利方向.

Geological features and exploration strategy of the upper 4th member of Shahejie formation in Guangli Oilfield

Guangli Oilfield locates in the east of the central uplift belt of Dongying Sag.It is held that braided delta front is developed in the upper 4th member according to the comprehensive analysis of geological feature,well logging and sample testing,and the reservoir sandbody geometry in this area is dominated by braided channel and front sandbar.The braided delta channel sandbody and front sandbar sandbody are the high-quality reservoir of the oilfild.There are two groups of hydrocarbon source rocks in Niuzhuang sub-sag in the western Guangli Oilfield.The oil shale of the upper 4th member can offer plenitudinous hydrocarbon for Guangli Oilfield.The good matching of structural nose with the braided delta sandbody is the key factor to the formation of the hydrocarbon reservoir.The west of the structural nose is the future exploration target of Guangli Oilfield.