Sedimentary facies models of channel turbidites of the fourth member of Paleogene Shahejie Formation in Yong 554 well block,Dongying Sag

The characteristics are studied on the conglomerate body of the member 4 of Paleogene Shahejie Formation in Yong 554 well block,Dongying sag by core observing,thin section and grain size analysis,seismogram and logging.It is showed that this conglomerate body was a deep water channel turbidites formed in a trough fault paralleling sag's long axis controlled by Tuo Yong Sheng fault and it's secondary faults on the south east slope in Dongying sag.The conglomerate body had low compositional maturity and textural maturity.Being the main rock types,medium sandstone and coarse sandstone,which were arkoses and litharenite mainly,and conglomerate had poor coefficients of psephicity and sorting.It is showed by grain size analysis that graded suspending was the main transition manner of clasts.Most of the sedimentary structures were generated by 1 gravity flow.The paper found its offlap facies model including channel subfacies and overflowing subfacies by discussing facies markers.The properties and cause of formation of reservoir in this channel turbidites were analyzed in the end of the paper.