The Es~3 Provenance System of Eogene Shahejie Formation in Minfeng Sub-Sag

The study of provenance system includes the clastic composition type and microscopic feature,heavy mineral assemblage, typical element distribution,sands distribution and palaeogeographic framework,etc of Es~3 of Eogene Shahejie formation in Minfeng subsag. The results show that the metamorphic rock,granite pegmatite,mid-basic effusive rock,basic-ultra basic intrusion rock and sedimentary rock are the main types of parent rocks.There exist NES directions of provenance systems in the studied area where obvious differences in the heavy mineral assemblages,the typical element ratio and the rock composition occur,thus forming the inshore submarine fan in the north,the Yong'an delta in the east and Dongying delta in the south.With the stratigraphic younging,the progradational boundaries of sediments appear towards the basin,with the shrinkage of north provenance system.The intersection area of the three directional provenance systems could be favorable prospecting area of turbidites.