A study on Paleogene sequence stratigraphy and sedimentary systems and a discussion on hydrocarbon exploration directions in Qinnan depression

Qinnan depression is relatively lower in exploration maturity,and there are major problems in its stratigraphy and sedimentology.Therefore,the sequence framework and its evolution and the areal distribution of main target intervals and its controls are analyzed by using a reservoir prediction method that integrates sequence stratigraphy,palaeogeomorphology and provenance analysis.Furthermore,the exploration directions are discussed for the Paleogene sequence from hydrocarbon migration.The Paleogene sedimentary systems are mainly controlled by various troughs along Fault Qinnan 2 and different break and accommodation zones.The accommodation zones located from the west and east ends of Fault Qinnan 2 to Fault Qinnan 1 are areas where reservoirs and carriers develop well in diffent times,and these zones are favourable targets for hydrocarbon exploration.