辛加地堑古近纪稠油富集规律和成藏模式

Enrichment Regularity and Accumulation Pattern of Paleogene Heavy Oil in Singa Graben

利用辛加地堑油田基础资料,对该地区稠油的成藏机制和富集规律进行综合分析。结果表明,辛加地堑具备很好的生储盖配置关系,烃源岩在上新世晚期进入生油高峰期,原油在沿断层向浅部储层的垂向运移过程中发生稠变形成稠油,并在一系列背斜和断块圈闭中聚集成藏,属于断裂输导型重质油藏;该地区稠油主要分布在辛加地堑中部地区,而主要富集层位是浅部的渐新统Chilou组浅海相灰岩和泥质灰岩层。

Using basic oilfield data in the Singa Graben,accumulation mechanism and enrichment regularity of heavy oil in this area were comprehensively analyzed. The results show that the Singa Graben has fine source- reservoir- caprock assemblages. The source rocks reached oil generation peak in late Pliocene epoch. Crude oil was converted to heavy oil during the vertical migration to shallow reservoir beds along faults,and accumulated in a series of anticlines and fault block traps,forming heavy oil reservoirs transported by faults. Heavy oil in this area is mainly distributed in the middle Singa Graben and enriched in neritic limestone and argillaceous limestone layers in shallow Oligocene Chilou Fm.