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On the basis of petrological��sedimentological and reservoir geological analyses��the authors con- sider the Pingyipu Formation of Tianjing mountain is mainly composed of gray middle- thick layer of quartz sand- stone��quartz sandstone intercalated silty mudstone and mudstone�� The shore facies are identified from the oil sands reservoir of Pingyipu Formation��and are further divided into the upper��middle and lower shore micro- facies�� The established sedimentary model showed sustainable settlement of Longmen Mountain area in Pingyipu stage and it ac- cepted the Paleo- - Tethys Ocean transgressive from west to east�� A lot of terrigenous detrital material deposited on the settlement area��forming the Pingyipu Formation continental margin detrital shoreland of the northwest- southeast zo- nation��northeast trending and the thick northwest part and the thin southeast part�� The physical properties of the reservoir are controlled by the sedimentary facies��in which the properties of upper shore face is the best��followed by the middle shore facies��and that of the lower shore facies is the worst��