MODEL EXPERIMENT STUDY OF FORMATION AND DISTRIBUTION OF ADJUSTED SUBTLE OIL-GAS RESERVOIRS——TAKING THE HINTERLAND IN JUNGGAR BASIN AS AN EXAMPLE

In superimposed basins,such as hinterland of Junggar Basin,the formerly accumulated subtle reservoirs usually have undergone adjustment due to the stack of multiple-stage tectonic movements,generation and accumulation.Studying mainly control factors of adjustment for formerly accumulated reservoirs and understanding their re-distribution rules,which are a primary guaranty of petroleum exploration.2-D physical model experiment ideally recurred adjustment process and result of variously adjusted subtle oil-gas reservoirs.The following results have been obtained:1) Due to reservoirs adjustment,the oil saturation of reservoir depressed obviously for its fine physical property.Some reservoirs turned into water layers indeed;while,the oil saturation of the one for bad physical property depressed less.The characteristic of different remain or different migration has been presented;2) The complexion of formation and distribution of concordant and converse adjusted reservoirs exists some difference;3) The adjusted reservoirs are dispersed and small-area distribution,and their trap types are mainly stratigraphic and lithologic traps instead of structural traps.