致密砂岩裂缝性潜山油藏基本特征与成藏模式——以东濮凹陷文明寨地区中生界裂缝性油藏为例

The Foundational Features and Hydrocarbon Accumulation Mode of Tight Sandstone Fractured Reservoirs——By Taking Mesozoic Buried-hill Reservoir of Wenmingzhai Area in Dongpu Depression for Example

致密砂岩裂缝性潜山油气藏是一类特殊的油气藏类型。从构造、岩性与物性、岩心裂缝发育、油气运聚成藏条件等多方面详细描述和总结了东濮凹陷文明寨地区中生界裂缝性致密砂岩潜山油藏的基本特征,认为基底大断裂控制了潜山的构造格局,裂缝与沿其分布的孔洞及其构成的缝洞系统是砂岩油藏的输导体系和储集空间,油源断裂、缝洞输导体系及缝洞型圈闭的发育与分布是控制砂岩裂缝型潜山油藏形成与分布的主要地质因素。东濮凹陷文明寨地区中生界砂岩裂缝性油藏的成藏模式对华北地区中生界潜山勘探有重要借鉴作用。

The tight sandstone fractural and buried-hill reservoir was a special type of hydrocarbon accumulation.The foundational features of tight sandstone fractured and buried-hill reservoirs of Mesozoic in Wenmingzhai Area of Dongpu Depression were described and summed up in detail from the aspects of structure,lithology and physical property,fractural distribution in cores and oil and gas migration and accumulation conditions and so on.It was considered that the basement faults controlled the tectonic framework of buried-hill reservoirs,the fracture and pore distributed along the fracture as well as their fractures-pore system were the transportation system and reservoir space of the sandstone reservoirs,the main geological factors controlling the forming of sandstone fracture buried hill reservoir were source faults and the transportation system of fracture and void as well as the forming and distribution of fracture-void traps.The reservoir forming mode of sandstone fractured and buried-hill reservoirs of Mesozoic in Wenmingzhai Area provide important reference for the exploration of buried hill reservoirs of Mesozoic in North China.