Gaobei subtle hydrocarbon reservoir is situated in northern flank of Gaoshangpu buried hill of Nanpu depression. The reservoir was formerly considered to be a structural hydrocarbon reservoir controlled by the fault.It is discovered by re-analyzing thickness of the skeletal sandstone and orientation of material sources that the reservoir is a type

composed of "sand wrapped by mud"

of litho-reservoir against structural background with feature of high production of energy initially and degrading quickly late on.Exploration process for the reservoir indicates that a thorough study of micro-sedimentary phase of reservoir shall be emphasized in the first place when searching for subtle hydrocarbon reservoir

restoring the reservoir by means of seismic inversion

defining the type of hydrocarbon reservoir by studying on comprehensive analysis results.