Phase-controlled and gas-washing fractionations during the formation of petroleum reservoirs

Abstract

By PVT fractionation experiments to model phase-controlled and gas-washing fractionations during the formation of petroleum reservoirs, the authors measured the physical and chemical properties of products formed in different fractionation stages and made a correlative analysis of the influence of depressurization and gas washing on oil/gas molecular composition and the rule of fractionation. The analytical results showed that gas washing is an important factor affecting the physical properties of crude oils, and also can be regarded as a good genetic interpretation of marine wax-high oils in the Tarim region, Xinjiang, China. Phase-controlled and gas-washing fractionations can lead to the formation of condensates and their differences in chemical composition from crude oils are a direct reflection of evaporating fractionation. Phasecontrolled and gas-washing fractionations have a great influence on the composition of molecular compounds and relevant parameters. So phase-controlled and gas-washing fractionations during the formation of petroleum reservoirs are not only favorable to identifying different processes of formation of petroleum reservoirs, but also to the scientific application of routine geochemical parameters.