Based on the heterogeneity of the geochemical properties of crude oils of petroleum reservoirs in the Luntai fault uplift，especially the difference of crude oil maturity，the paper proposes that lacustrine oils(crude oils with normal density and black oils)input at the southwestern end of the fault uplift and that coal related oils input at the northeastern end．Crude oils with normal density and black oils formed primary oil reservoirs，but gas—condensate reservoirs are secondary nil．and gas reservoirs formed by migration fractionation of crude oils in primary oil reservoirs．