苏丹Great Unity油田成藏特征分析

Great Unity油田位于Muglad盆地中央隆起带上,是苏丹1/2/4项目主力产油区块之一。Great Unity构造是一个大型断裂背斜构造,主要发育背斜、断鼻和断块3种圈闭类型,圈闭数量多,AradeibaA层顶部构造圈闭多达29个。烃源岩为AbuGabra地层,储层有多套,包括Bentiu、Aradeiba、Zarqa、Ghazal和Baraka等,形成具有多套油水系统的"叠盘式"油藏。其含油层位多,含油井段长,以层状油藏为主。成藏主控因素分析表明,大断层是油气垂向运移通道,两侧油气富集,断层侧向封堵是形成反向断块有效圈闭的关键。

Reservoir Accumulation Characteristics Analysis of Great Unity Oilfield,Sudan

Great Unity Oilfield,one of the main productive ares of Sudan 1/2/4 project,lies on the central uplift belt in Muglad Basin.Structure of Great Unity is a large-scale faulted anticline,with 3 trap patterns developing on it,i.e.,anticline,fault-nose and fault-block.The Great Unity structure has large amount of traps with 29 structural traps on top Aradeiba A.Abu Gabra formation source rock and multiple sets of reservoirs including Bentiu,Aradeiba,Zarqa,Ghazal and Baraka,etc,form the multi-oil-water system called "tacked plate pattern"reservoirs which have many oil-bearing formations and long oil-bearing well sections.Most are layered reservoirs.Analysis of key factors of reservoir accumulation indicated that the major faults are the vertical migration pathways of hydrocarbons.Oil and gas accumulated along the major faults.The lateral sealing condition was crucial to form an effective fault-block trap.