The light hydrocarbons of oils play an important role in their geochemistry, especially in mixed oils. The database of the Key Laboratory of Petroleum Geochemistry, China National Petroleum Corporation has accumulated 824 oil sample records. The oil samples represent most of the oil areas of China. In this paper the light hydrocarbons of salt lake derived oils from Jianghan basin, China, were studied. These oils are characterized by high toluene contents and high K1 [K1=(2-MH+2,3-DMP)/(3-MH+2,4-DMP)] values. The reason is unclear but may be related to the high salinity environment of the source.

目前中国石油集团公司油气地球化学重点实验室原油轻烃数据库有548个中国油样的分析数据,样品基本覆盖了中国各个油区,具一定的代表性.在此基础上,选择江汉盆地(中国典型的盐湖相沉积盆地)原油轻烃的地球化学特征进行研究,它们具甲苯含量高、(2-甲基己烷+2,3-二甲基戊烷)/(3-甲基己烷+2,4-二甲基戊烷)值高的特征,推测可能与江汉盆地独特的沉积环境有关.原油轻烃中甲苯含量高和(2-甲基己烷+2,3-二甲基戊烷)/(3-甲基己烷+2,4-二甲基戊烷)值偏高的特征有望成为判别烃源岩沉积环境的地化指标之一.图4表1参14