千米桥潜山凝析气藏地质特征

THE GEOLOGICAL CHARACTERISTICS OF QIANMIQIAO BURIED HILL CONDENSATED POOL

千米桥潜山凝析气田是我国东部地区近年发现的大型气田。千米桥潜山凝析气藏是一个以中高凝析油含量和饱和型凝析气藏为主体的复合气藏。该气藏的构造为道冲构造侵蚀而成的残丘山,储集体为奥陶系碳酸盐岩溶蚀缝洞孔体系,流体呈层状分布(集中分布于奥陶系峰峰组和上马家沟组上段)。千米桥潜山凝析气藏温度高,压力系统正常,处于封闭水文地质体系中(无活跃边、底水),具有弹性气驱生产特征。

This paper is focused on the geological characteristics of Qianmiqiao buried hill condensated reservoir. It's a composite reservoir formed mainly by saturated one with middle-high condensate. It's a residual mountain(unaka) which were a set of thrust blocks under the erosion unconformity. It's reservoir pore space is a fracture-vug-pore system of Ordovician carbonate karst. The fluid distribute like layer in Fengfeng formation and up-Majiagou formation in top of Ordovician. This reservoir has high temperature and normal pressure. There are nether active edge water nor bottom water in it which is in confining hydrogeological environment, so it's pressure depletion drived. The hydrocarbon in it is derived from saprohumic organic matter in mature to post-mature phase from northen Shasan member in Banqiao sag of Huanghua depression.