关键词: 液态烃, 油气类型, 凝析油, 高成熟, 低成熟, 成熟度, 中质油, 演化阶段, 轻质油, 重质油

Abstract: Liquid hydrocarbons are classified into five types according to their maturity and property, viz., immature heavy oil, under-matured heavy oil, fairly-matured medium oil, matured light oil and highly-matured condensate oil; and gaseous hydro-carbons into bio-methane, associated gas, condensate gas and ultimate methane, The characteristics of hydrocarbon series are examined from data of their physical properties and of n-alkane, isoalkane, sterane, terpane, ultra-red spectrum and paraffin index etc, which show the tendency of change from low to high maturation, as is expressed in the decrease of specific gravity, viscosity and resin-asphaltane and increase of total hydrocarbon content in the fractions and group composition for liquid hydrocarbons; and in the increase of light components and disappearance of OEP in n-alkanes, different forms of conversion of sterane, terpane, hopane, increase of carbon isotope δC₁₃, paraffin index, specific gravity of gaseous hydrocarbons, and decrease of methane content etc.