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The Upper Cretaceous Qingshankou Formation(K2qn)and Nenjiang Formation(K2n)in the Songliao Basin(SLB),China,contain discrete ostracodites.The ostracodites range in thickness from 5 to 380 cm.Based on integrated analysis of seismic,drilling,core and logging data,the sedimentary characteristics,distribution patterns and hydrocarbon implicationsof the ostracoditeshave been studied in this article.