辽东湾坳陷辽西低凸起潜山构造特征与油气聚集

辽东湾坳陷辽西低凸起具有明确的南、中、北3段构造分段特征,潜山构造样式呈典型的翘倾断块状态,潜山地层结构由太古界变质岩、寒武-奥陶系碳酸盐岩和中生界火山岩构成3层复式结构.辽西低凸起潜山油气聚集主要与两个因素相关:一是古近系是否发育储层,二是辽中凹陷油气资源是否充足.因此,大规模的潜山油气聚集多是在主断槽油气供应充分、且潜山上覆古近系缺乏优质储层的情况下发生的.

Structural characteristics and hydrocarbon accumulation in the buried hills of the Liaoxi low salient, the Liaodong Bay Depression

The Liaoxi low salient in Bohai presents clear structural segmentation characteristics and can be divi-ded into southern,middle,and northern parts.The buried hills there present a typical structural style of tilting fault-block and a three-layer architecture consisting of the Archaean metamorphic rocks,Cambrian-Ordovician carbonates,and Mesozoic volcanic rocks.Hydrocarbon accumulations in the buried hills of Liaoxi low-salient are mainly determined by two factors:development of reservoirs in the Paleogene and abundance of hydrocarbon resources in the Liaozhong sag.Therefore,large-scale hydrocarbon accumulations in buried hills occur mostly in circumstances that hydrocarbon supply from the main fault-troughs is plentiful and high-quality reservoirs are absent in the Paleogene.