油藏物理学一地层原油的高压物桂 classification on formation oil low viscosity oil:oil viscosity<5mPa.s; medium viscosity oil:oil viscosity is 5~20mPa.s; Ohigh viscosity oil:oil viscosity is 20~50mPa.s; heavy oil:oil viscosity>50mPa.s。油藏物理学——地层原油的高压物性 classification on formation oil low viscosity oil: oil viscosity＜5mPa.s； medium viscosity oil: oil viscosity is 5~20mPa.s； high viscosity oil: oil viscosity is 20~50mPa.s； heavy oil：oil viscosity ＞50mPa.s