Sequence stratigraphy and sedimentary facies of Silurian in the central area of Tarim basin

On the basis of core-scaling logging data,a model and its logging data interpretation of Silurian sedimentary micro -facies of tide flat without barrier in central area of Tarim basin are established,and two sedimentary sub-facies and five micro-facies are classified.By identifying the sequence interfaces and sedimentary cycle such as unconformity sur- face and lacustrine flooding surface,the framework of se- quence stratigraphy of the Silurian in central area of Tarim basin is set up.Three third-level sequences and eighty sub- sequence sets are classified,of which every three-level se- quence is composed of transgressive system tract(TST)and high stand system tract(HST).By combining with the ver- tical superposing style of subsequences in the system tract, presented is the distribution area of favorite hydrocarbon- containing reservoirs in the system tract or the subsequence set.These results can be used for reference in the research on strata correlation in the transitional phase of marine and non-marine sequence,and in the exploration of stratigraph- ic and lithological pools in central area of Tarim basin.