Abstract: Based on the large number of cores,logging,oil testing and analytical testing data,the oil-water layer identification of Shawan formation from Chun-10 well in Chunguang oilfield has been studied.In order to realize qualitative identification of oil reservoirs,the four properties and logging parameters characteristics have been studied.By applying core scale logging technology,the porosity interpretation chart has been established.In combination with formulas regression,experience formula and mercury injection methods,the oil saturation more suitable for this area has been determined.On the basis of this,oil-water layer identification plate suitable for this well area has been established and it will enhance the logging interpretation accuracy of reservoir parameters.