An analysis is performed on the fault characteristics

typical reservoirs

and residual pressure distribution in the Mesozoic of the Mahuangshan area in the western margin of Ordos Basin.The results show that the hydrocarbon distribution and plays there vary greatly in different structural belts and structural control on reservoirs is significant.In the thrust belt in the western margin

proximal plays and distal plays are predominant.The re-servoir types here are mainly fault-block and faulted anticlinal(nose) reservoirs

featuring in small area but high oil column and small reserve but high production.While in the central depression

the indigenous plays are predominant.The reservoirs here are tight low-permeability type featuring in large area

low oil column

and low production.In the eastern uplift belt

proximal

distal and indigenous plays all occur.The reservoirs are dominated by anticline-lithologic reservoirs.