油藏物理学一地层原油的高压物桂 The relationship between oil density and API gravity(America Petroleum Institute) Po Oil density Po Y= Oil relative density Pw 141.5 API -131.5 Y。油藏物理学——地层原油的高压物性 The relationship between oil density and API gravity(America Petroleum Institute) o o o V m   Oil relative density Oil density w o     131.5 141.5 － o API  