Cave and cleft in karst limestone are the main oil-bearing space of Ordovician oil poor in Tahe oil field,the develop level of ancient karst controlled the formation oil pool in Ordovician reservoir.

• 塔河油田奥陶系油藏储集空间以碳酸盐岩岩溶孔洞缝为主,古岩溶发育程度对奥陶系油气成藏有重要的控制作用。