三塘湖盆地复合含油气系统成藏特征

详细阐述了复合含油气系统地质要素之间的关系。认为三塘湖盆地存在上、中、下三个含油气系统。中含油气系统单源多储多期成藏，复合含油，油气来自二叠系芦草沟组，具有印支运动早期和燕山运动晚期两个成关键时刻（以前者为主），马郎凹陷黑墩带、牛圈湖带和马中带所环绕的二叠系生烃中心为油气主要分布区，油气以垂向运移和短距离侧向运移为主，系统充注能力强，主要储集层为二叠系芦草沟组和侏罗系西山窑组，系统排聚效率高，资源密度大，是最主要的含油气系统；上含油气系统油气来自三叠系小泉沟群，晚燕山运动期为成藏关键时刻，系统持续时间从中－晚三叠世到白垩纪末，保持时间从晚白垩世至今，油气主要分布于各湖凹陷三叠系统成熟生油岩范围之内，纵向上则集中于下侏罗统。

Reservoir Characteristics of Composite Petroleum System in Santanghu Basin

The relations among the geological factors of composite petroleum system are set forth from the view point of petroleum system in Santanghu basin. Three petroleum systems exist which can be divided into upper, middle and lower sections. The middle petroleum system, the most important one, is characterized by single source, multi-reservoir and multi-stage pools. The hydrocarbon source comes from Lucaogou formation(Permian), including tWo stages of reservoirs due to eary Indosinian movement and late Yanshan movement, dominated by the former. The ma jor hydrocarbon distribution area is Permian hydrocarbon - generating c e nter surrounded with Heidun- Niujuan - Mazhong zone in Malang sag. Vertical and short-distance lateral hydrocarbon migrations are suggested and accompanied with high-filling capacity. The major reservoirs are Lucaogou formation in Permian and Xishanyao formation in Jurassic, with high efficiency in drainage and accumulation, being the most important petroleum system for its abundant hydrocarbon resources. The upper petroleum system's hydrocarbon comes from Xiaoquangou formation in Triassic, where the key stage of forming reservoirs is late Yanshan movement episode, lasting from Middle-Inte Triassic to the end of Cretaceous,while the preservation stage in from Late Cretaceous to present. The hydrocarbon is mostly distributed within the scope of matures source rock in Triassic of Tiaohu sag, and centered in Lower Jurassic vertically.