Characteristics and controlling factors of karst weathering crust reservoir of Yingshan Formation in northwest of Katake Uplift

The Katake Uplift locates in the central desert of the Tarim Basin.It is an inherited palaeo-uplift formed during the middle Caledonian.The widespread karst weathering crusts of the YingshanFormation generated during the middle Caledonian tectonic movement,and strengthened during the lat-ter tectonic evolutions.Caves and fissures generated in the crusts.Drillings have indicated that the karstweathering crust reservoirs mainly distribute in the higher part and the slope of paleogeomorphology andpresent structures,closely related to NE oriented adjusting faults.The reservoirs are controlled by thepaleogeomorphology of Phase-Ⅰ,the middle Caledonian as well as the latter tectonic deformations.TheYingshan Formation of Ka1 region locates in the higher part of paleogeomorphology.It has experiencedstrong tectonic deformation and is favorable for accumulation.The key for exploration in Kal regionshould be fault accurate interpretation and reservoir identification.