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".

Unbiased prediction and its construction relationship to unbiased estimation in finite populations with arbitrary rank;