Abstract:

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.

Key words: Tarim, Ordovician, karst reservoirring, Akekule paleo-uplift, karst oil-gas pools, prospects