Set about coal accumulation characteristics in the area,summed up the Longtan Formation is a limnic to transitional facies-river-dominated deltaic deposit formed under transgressive condition.

Chang6 oilbearing formation in Wangyao tract is thought a lacustrine deltaic depositional system according to the core description and analysis,and the distribution form of sand bodies.

Based on the study of great quantity of core,well logging,area precipitation facies,this paper calculated the sediment in Xing 56 District was the regular delta sediment,classified 9 lithofacies,2 subfacies and 10 microfacies.

Guangbei area,one part of Bamianhe oilfield,is a complicated fault block oilfeild,in Paleogene,the tectonism was some strong and some synsedimentary faults dominated the depositional topographer of the area,the third member of Shahejie Formation widely developed delta sedimentation system,which become one of the primary oil formations.

The Ed delta deposition is developed in the gulches and valleys of the north slope of Chengji-azhuang uplift.

The delta deposits from the Zhuhai Formation in the Zhu-1 depression of the Zhujiangkou Basin;