塔里木奥陶系岩溶储集的油气前景

OIL AND GAS PROSPECTS OF ORDOVICIAN KARST RESERVOIRING IN TARIM BASIN

王金琪

Wang Jinqi

塔里木奥陶系岩溶储集具有烃源多、深埋改造、叠合成藏及成藏的延续性和突跃性的特点,而叠合成藏则可能是寻找大油气田的主要方向。阿克库勒古隆起的发展与油气聚集关系十分密切,寒武-奥陶纪为油气大规模聚集时期,海西早期的构造运动奠定了溶蚀作用的网络基础,海西晚期运动则构成了特大型油气聚集的构造基础,中生代至中新世完善了对古隆起的全面封盖,是油气聚集成藏的顶峰。雅克拉断隆和沙西地区、塔中隆起区、玛扎塔克海西早期古隆起和巴楚西部等地区亦具有各自不同的良好储集条件,有的甚至已发现一批油气田,它们都有非常广阔的找油前景。

Ordovician karst reservoiring of Tarim Basin is charaterized by multi-hydrocarbon sources, deep burial reformation and overlap pool forming. The overlapping pools may be the main targets for discovering giant oil and gas fields.Development of Akekule paleo-uplift bears colse relation to its oil and gas accumulation. Large-scale of oil and gas accumulation happened in Cambrian-Ordovician Periods; tectonic movements of Eerly Herctnian laid a foundation for the network of carbonate rock solution; tectonic movements of Late Hercynian founded a structural base for huge oil and gas accumulation; and the overall sealing-caping of the paleo-uplift was perfected in Mesozoic-Miocene Periods. This Period was also the peak stage for oil and gas accumulation and pool-forming. It is suggested that Yakela fault-uplift, Shaxi area,Tazhong uplift, Early Hercynian Mazhatake paleo-uplift and West Bachu regions have fine reservoiring conditionsres pectively. They all have splendid prospects for oil and gas exploration.

10.11743/ogg19990408