埕岛油田东部斜坡带东下段沉积特征及油藏类型研究

埕岛油田东部斜坡带下第三系油藏以三角洲、浊积扇砂体隐蔽油气藏为主，储层埋藏深、厚度变化大，油气成藏复杂。通过对该带的沉积特征、沉积体系和沉积物源的研究，指出其东下段砂体的分布主要受物源和沉积相带两方面控制，砂体只有在有效圈闭情况下才能成藏，并且从构造上总结了三种油藏类型。最后指出该带下一步勘探重点是沿主物源方向展布的、成藏条件良好的各种砂体。

Study on sedimentary characteristic and oil reservoir types of lower Ed in the eastern slope of Chengdao oilfield

The delta and turbidite fan sand subtle reservoirs with deep burial depth, large variable thickness, and complicated oil-gas reservoir forming are taken as the dominant factor in Eogene oil reservoir in the eastern slope belt of Chengdao oilfield. Through the study of the sedimentary characteristics, system and source of the belt, it presents that the distribution of its lower Ed sandbody is mainly controlled by the source and sedimentary fa-cies belt, and oil reservoir can only be formed in effective trap. Thus three reservoir types are summarized on structures. Finally it points out that the exploration next will focus on all kinds of sands which spread along the main source and possess better reservoir forming conditions.