Abstract:

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.

Key words: tight sand, proximal play, distal play, hydrocarbon distribution pattern, Mesozoic, Mahuangshan, Ordos Basin