摘要
塔中低凸起北部斜坡带下奥陶统风化壳不仅为油气的重要运移通道,而且是重要的油气储集层。与其下伏的寒武系储盖组合一起,在上奥陶统良里塔格组的含泥灰岩沉积之后就能够有效捕获北部的满加尔凹陷寒武系泥岩烃源岩在中-晚奥陶世生油高峰期生成的油气。下奥陶统储盖组合形成早,与下伏寒武系储盖组合通过断层、裂缝沟通,是喜马拉雅运动期重要的天然气输导层,在合适的存在适宜的遮挡条件的场所,如出现断层封堵、饱含水的致密层封堵以及早期生物降解沥青层封堵等,可以聚集形成连片分布的天然气藏。
The Lower Ordovician weathering crust in north slope of Tazhong low-swell is an important channel for petroleum migration and reservoir together with underlying Cambrian as a cap rock.Following the muddy limestone deposit of Lianglitag formation of the Upper Ordovician,the hydrocarbon generated in the Middle-Late Ordovician as peak stage for oil generation in the Cambrian shale source rocks in Manjiaer sag of northern Tazhong area could be trapped effectively.The reservoir-caprock assemblage of the Lower Ordovician formed earlier may be connected with that of underlying Cambrian through faults and fractures,which is a significant natural gas transport layer during Himalayan movement.The Lower Ordovician weathered crust reservoirs linking to the underlying Cambrian reservoir-cap combination by faults and fractures is important gas migration layer during the Himalayan.In the places of suitable sealing conditions such as the fault blocking,compact layer sealing saturated with water and asphaltene sealing formed by early biological degradation,it is believed that natural gas accumulation in continuous distribution could be formed.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2011年第3期277-280,共4页
Xinjiang Petroleum Geology
