大民屯凹陷泥丘形成机制及其与油气的关系

THE RELATIONSHIP BETWEEN FORMING MECHANISM OF DA MINTUN DEPRESSION'S MUD CONE AND OIL AND GAS

介绍了研究区泥丘的分布特征,即群状分布特征,泥丘上拱层位不一,高处可达东营组顶部。论述了泥丘的形成机制,认为泥丘的形成和源岩的生排烃有直接关系。讨论了研究区泥丘的形成时间,指出,由于泥丘的形成导致在泥丘周围形成一系列油气藏,其中有在泥丘上拱形成的背斜油气藏,有泥丘侧向封堵形成的油气藏,在泥丘内部的薄砂层中,还发现有岩性油气藏。

In this documnel we make the pattern ot mud cone more obvious by deep migration processing 3D data in Da Mintun area. Through a vast amount ol data researching, the author expounds the distribution characteristics; the mud cone in this area is distributed in the form of group, and the arch upward is different, the highest formation reaches later period of Dong Ying Zu. In this document,the author expounds the forming mechanism of mud cone from 5 aspects,thinks the forming of mud cone has direct relationship with the creation 8- elimination of hydrocarbon, and determines the forming time of mud cone. The forming of mud cone results a series of oil & gas reservoir forming around mud cone, including and cline reservoir formed on the upward arch and reservoir formed by means of side seal. There is a remarkable appearance,that is,in the thin sandstone formation in inner side of mud cone,there exists lithologic reservior. Altogether, the mud cone group development in Da Mmtun depression makes the reservoir in I his depression relatively rich,however,because the mud cone group is far away from material source area.so the sandstone is rela tively small,and make it difficult to explore. The exploration in recent years proves that this area is a beneficial place for oil & gas exploration.