Abstract:

Two types of fan deltaic sequences have been identified in Bijia fault block,Binnan Oilfield,i e.near source sequence and far source sequenec.The sequences from the fourth to the first sand beds suggest the evolution process of shallow →bathyal water evironment.The north marginal contemporaneous fault controlled the debris supply of 1st～3rd sand beds,and the forth sand bed seemed to have multi source supplies.Reservoirs in this area are mainly various sand bodies in fan deltaic front,among which river mouth bars and distributary channels are more favourable.The vertical heterogeneity of the reservoirs are closely related to depositional evolution.