Abstract:

Tahe Oilfields is composed of different ages of reservoirs such as Triassic,Carboniferous and Ordovician reservoirs.The main part is the network consisting of karst cracks and holes in Ordovician limestone reservoir.Its controlling factors are karst holes,cracks and pores which formed quite different in size,time and extending direction and connected into nets in very complicated ways.The reservoirs vary in reserve,productoin capacity and oil quality due to the different levels of net developing and history of reservoir forming.

Key words: Tarim, Tahe Oilfield, carbonate rock, karst, oil-gas pool