Abstract: By means of chromatography-mass spectrography and gas chromatography, isoprenoids (i15-i20) have been identified in 49 crude oil samples and 3 rock samples from oil fields in Shengli, Huabei, Subei, Dagang, Liaohe and Daqing and also from Sichuan, Gueizhou etc. The relative contents, in percentage, of phytane (Ph), pristane (Pr), norpristane (i18), 2. 6.10-trimethyl-tridecane (i16)and farnesane (i15) are determined, as well as the ratios of Pr/Ph, Pr/nC₁₇, Ph/nC₁₇ and (i18+i16+i15)/(Ph+Pr). The curves of the relative contents of Ph, Pr, i18, i16 and i15 may show the character of different oils, useful for correlation purpose. The evolution of isoprenoids in crude oils is divided into sub-mature stage (Pr/Ph>0.8, (i18+i16+i15)/(Ph+Pr)=0.2-0.5); mature stage (Pr/Ph>0.8, (i18+i16+i15)/(Ph+Pr)=0.3-0.6) and highly mature stage (Pr/Ph>1.0, (i18+i16+i15)/(Ph+Pr)>0.6).

摘要： 本文用色谱-质谱法和气相色谱法鉴定了胜利油田、华北油田、苏北油田、大港油田、辽河油田和大庆油田以及四川、贵州等49个原油和3个岩样中的类异戊二烯烷烃(i15～i20),测定了植烷(Ph)、姥鲛烷(Pr)、降姥鲛烷(i18)、2、6、10-三甲基十三烷(i16)和法呢烷(i15)的相对百分含量(五个组分的含量为100%),以及Pr/Ph、Pr/nC₁₇、Ph/nC₁₈和(i18+i16+i15)/(Ph+Pr)。Ph、Pr,i18,i16和i15的相对百分含量分布曲线可以表明原油的特征,用来对比原油。原油中类异戊二烯烷烃的演化可以分成低成熟阶段,成熟阶段和高成熟阶段。