The Reservoir Characteristics and Controlling Factors of Chang 6_1 Formation in Hujianshan Oilfield of Ordos Basin

According to the data of core observation,casting thin sections and intrusive mercury curve,the petrologic,pore characteristics and reservoir space of the Chang 61 Reservoir in Ordos Basin were studied deeply and main influential factors of reservoir characters were analyzed.The result indicates that the lithologic properties of Chang 61 Reservoir are mainly fine arkose and debris-feldspar and lower compositional maturity and textual maturity,besides,the reservoir space is primarily residual intergranular pore and feldspar-dissolution pore,the flake throat and bending-flake throat is the basic seepage passage.Reservoir property is controlled mainly by sediment facies and diagenesis.