Discussion on sequence stratigraphy and petroleum system of the Lower Cretaceous in Liupanshan Basin

Based on the sequence stratigraphic analyses of outcrops,welllogging and seismic data,one sequence can be identified from the Liupanshan Group,the Lower Cretaceous,within which LST,TST and HST were developod,reflecting the evolution of basin forming,expanding,prospering,shrinking and vanishing of Liupanshan Basin in the Early Cretaceous.The characteristics of geological elements and functions of the Cretaceous petroleum system in Liupanshan Basin are also discussed.It is pointed out that in general although the key time of the Cretaceous petroleum system in Liupanshan basin has not yet arrived at,the oil and gas pools in the Cretaceous petroleum system in Liupanshan could still be found at the underthrust or in some structural belt near the fault.