Sequence stratigraphy and sedimentary facies in the Carboniferous Kalashayi Formation in the Tahe Oil Field,Tarim Basin,Xinjiang

The present paper deals,in the light of core examination,seismic data and well logs,with the types and distribution of the sedimentary facies in the Carboniferous Kalashayi Formation in the Tahe Oil Field,Tarim Basin,Xinjiang.The Kalashayi Formation may be divided into two third-order sequences.The sequence CKLSQ1 consist of three systems tracts: lowstand,transgressive and highstand systems tracts.The sequence CKLSQ2 consist of two systems tracts: transgressive and highstand systems tracts.The sedimentary facies are composed of the alternating terrigenous delta and tidal flat facies,and display the follwing arrangement: the delta facies in the northern part,the tidal flat facies in the southern part,and the transitional facies in the central part.The framework of sedimentary facies may provide geological evidences for further reservoir prediction and delineation in the study area.