初论原油单体烃系列碳同位素分布特征与生油环境之间的关系

生油盆地主要分为陆相和海相环境，陆相盆地主要有淡水－微咸水、淡水和半咸水－咸水三种湖相沉积环境，其中不同沉积相中有机质类型和丰度不同，这反映在它们所形成原油的单体烷烃碳同位素分布上有区别。高等植物出现前后的海相沉积油源岩中有机质类型有着较为明显的差别，泥盆纪以前的成油母质以细菌、蓝绿藻等原核生物为主，而石炭纪以后以真核生物（包括浮游植物、浮游动物等）为主，这样它们所形成原油的单体烃类碳同位素分布各

PRELIMINARY DISCUSSION ON CARBON ISOTOPIC DISTRIBUTION PATTERN OF INDIVIDUAL HYDROCARBONS FROM CRUDE OIL AND ITS RELATIONSHIP TO OIL-FORMING ENVIRONMENT

The oil basins are divided into marine and nonmarine facies, and the nonmarine basins may be further subdivided into three depositional environments: freshwater-brackish lake, freshwater lake and salt-semisalt lake. In different terrigenous sedimentary facies, organic types and abundance are different, as reflected by carbon isotopic distribution of individual alkane hydrocarbon from crude oils. This paper discusses the relationship between the sedimentary environments and the carbon isotopic distributions of individual hydrocarbons in crude and condensate oils, as well as the influence of maturity on the carbon isotopic ratio of individual hydrocarbons.