In terms of structural development,development history,and impacts of structure on oil/gas migration and accumulation,relations between structure and formation of oil/gas reservoirs were established for Gucheng region in Miyang depression on the basis of the restoration of basinal evolution of the 3rd member of Hetaoyuan formation time.

Normalized full gradient of gravity anomalies can be used to find the location of source and inspect hydrocarbon structure because of its characteristic of "one less value between two high values".

The structural reservoir in piedmont thrust zone and structural-lithologic reservoir in oil-rich sag of southern margin of Jiuquan basin are two main exploration fields in the basin.

The results show that strike-slip zone is potential for finding structural reservoir,and it is pointed out that the Taipingzhuang structure in the north of Xiaokuan faulted zone is the target for further structural reservoir exploration.