THE CHARACTRISTICS OF THE UPPER JURASSIC─LOWEKR CRETACEOUS SEQUENCE STRATIGRAPHY AND THEIR SIGNIFICANCE IN HYDROCARBON EXPLORATION IN THE SOUTHERN SONGLIAO BASIN

In using of the basic concepts and research method of sequence stratigraphy,the Upper Jurassic-Lower Cretaceous sequences were preliminarily divided into four sequences according to seismic section and well data,each of which consisted of three system domains.The sedimentation of the domains and distribution of the lithofacies were mainly controlled by structural subsidence,while influnce of water level changes subsidiary.Meanwhile,two kinds of sequence stratigraphic frameworks were established.The faulted basin with Shiwu type(faulted depression)of strtigraphic framework has a favorable combination of generation, reservoir and seal of hydrocarbon,showing a good potentiality ofoil and gas resources.