埕北30潜山构造演化与油气富集规律研究

本文通过叠前深度偏移并结合探井资料、区域应力场的研究，指出埕北30潜山经历过印支期－燕山期北西向－燕山期北东东向局部应力场的转换及喜山期的区域拗陷，形成了古生界的反转结构，并导致潜山内幕逆断层及裂缝异常发育，古生界缺失严重；根据地层发育情况，分析了储、盖组合配置关系，指出该潜山存在多套储盖组合，由于裂缝极为发育，从而构成了良好的油气圈闭；根据构造幅度、地层岩性、断裂发育程度及盖层资料，指出本区中生界主要形成孔隙型风化壳油气藏，古生界主要形成以构造裂缝、溶蚀孔洞为主的块状油气藏；根据地化分析，认为埕北30潜山油气藏属于典型轻质凝析油气藏，桩东凹陷是其主要油气来源。

Study for evolution of CB30 buried hill structure and rule of oil-gas accumulation

Through pre-stack depth migration data and combing study of drill data with study of regional stress field, the paper pointed out that undergoing transformation of local stress field from Indo-Chinese stage(NW) into Yanshan stage (NEE) and regional depression in Ximalaya stage,CB30 buried hill formed reversal structure in Paleozoic,leading to extreme development of reversed fault and fracture in buried hill inside and a lot of losses of Paleozoic; analyzing combination relation of reservoir and cap formation according to formation development, the paper pointed out that there exist multiple set of combination of reservoir and cap formation in buried hill,so constituting a good trap for oil-gas because of extreme development of fracture; also pointed out that pore-style weathered crust reservoirs mainly formed in Mesozoic and lump-shaped reservoir,mainly being structural fracture and dissolution cave,are formed in Paleozoic based on structural amplitude,formation lithology development degree of faults and cap formation data; finally considered that CB30 buried hill reservoir belongs to typical light con-densate reservoir and Zhuangdong Depression is main oil-gas source according to geochemical analysis.