中国海相油气田勘探实例之三渤海湾盆地任丘古潜山大油田的发现与勘探

任丘油田发现于1975年,是我国最大的海相碳酸盐岩潜山高产油田,1996年探明储量4×108t。油田为一古潜山复式油气聚集带,由蓟县系雾迷山组、奥陶系马家沟组和亮甲山组、寒武系府君山组三个古潜山油藏以及古潜山上覆的下第三系沙河街组油藏构成。古潜山油藏为缝洞孔十分发育的碳酸盐岩储集体,油源为上覆的下第三系沙河街组,具独特的“新生古储”的油藏地质特征。论述了油田的发现和勘探历程、古潜山油藏的成藏特征,以及寻找古潜山油田的启示。

Cases of Discovery and Exploration of Marine Fields in China (Part 3): Renqiu Buried-hill Oilfield, Bohaiwan Basin

Renqiu Oilfield, discovered in Bohaiwan Basin in 1975, is a large high-paying oilfield with the proved oil reservesof 4×108t (1996). It is a compound carbonate buried-hill zone of hydrocarbon accumulation, in which porosity, fractures, vugsand caves are well developed. Oil traps comprises the Jixianian Wumishan, Ordovincian Majiagou and Liangjiashan, andCambrian Fujunshan buried-hills. Oil are directly derived from the overlying younger Paleogene Shahejie oil reservoir. Thediscovered and proved history of the large oilfield, the geological characteristics of the buried-hill oil reservoirs and therevelation for search and exploration are revealed.