Study On Reservoir Characteristics Of Chang8in Huanjiang Area Of The Ordos Basin

The Chang8oil-beairng Formation of Huanjiang area in Oulosbasin is Important oillayers,influenced by multiple-stage deposition，complex diagenesis of various types andtectonic factors,the reservoirs are featured by tiny pore space and complex pore structure,which result in that sedimentary microfacies development situation and reservoir physicalproper ties are so confused，with the improvement in the level of oil and gas development,favorable reservoir and producing construction zone are restricted.In view of this, the author has deeply studied about the microfacies, diagenesis and thereservoir characteirstics of the Chang-8member of beairng-Formation according to the coredata, thin section analysis, SEM.. Combined with analyses above, with the employment of thetechniques like cast thin slice, high pressure mercury intrusion and image analysis, this thesismade thorough research into the relation between physical property characteristics parametersand pore structure characteirstics parameters, the relevance of pore throat characteristicsparameters and the characteirstics parameters which affect the mecrury intrusion results,then the theory similar to black box theory was applied to selected back mercury saturationrelfecting pore space as well as mercury eiffciency retire relfecting throat volume, at last,reservoir comprehensive evaluation parameter of microscopic pore structure was identiifed,calculated and analysed, which reveals pore structure characteirstics, microscopic mechanismof reservoir macroscopic characteirstics in tight reservoirs.This paper made reservoir comprehensive evaluation analysis qualitatively andquantitatively based on microscopic macroscopic characteristics of reservoir. Type-Ireservoir which developed recently or atfer evaluation and type-II that developed atferevaluation with the deployment of scrolling development well and development well andtype-III which developed at last peirod of production were selected to provide more favorabletarget area for oil field increase in oil reserve and production.