BASIC CHARACTERISTICS OF THE EARLY CARBONIFEROUS DEPOSITIONAL SYSTEM TRACT IN THE NORTH OF THE TARIM BASIN

Based on the principles of sequence stratigraphy,the paper described the basic characteristics of depositional system tract in the Lower Carboniferous.Field data showed that the system is a secondary cyclic sequence interbedded between 2 tectonic unconformities of the Early and Late Variscan periods.A transgressive system domain and a highstand system domain were developed within the sequence,with the sediments of lowstand system domain being absent. Favourable areas for oil/gas accumulation are barrier bar facies zones developed in the transgressive system domain and tidal channels developed in the highstand system domain.