Karst Development Mode of Ordovician Carbonate Rocks in Lunnan Swell in Tabei Area, Tarim Basin

The large area of platform-facies deposits of the Cambro-Ordovician in Tarim basin provides foundation for the post-karst reservoir development in Lunnan area,which can be classified as the buried-hill exposure karst,bedding confined water karst,penecontemporaneous interlayer karst and commingled water karst,etc.,with multi-cycle and multi-stage exposure features.The study shows that tectonic movement is of crucial effect on the karsts development and related reservoir formation in this area.