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原油C5—C13轻馏分中C8以上组成一直是油气地球化学研究中的薄弱环节。对塔里木盆地40个海相油、湖相油与煤成油样品的C5—C13轻馏分进行了全烃气相色谱定量分析,在前人研究的基础上,结合C7轻烃组成,对比分析了不同成因类型原油C5—C13轻馏分族组成特征。大涝坝油气田湖相油的环烷烃含量较高,雅克拉油气田海相油的支链烷烃含量较高,轮台地区和库车坳陷部分煤成油则具有较高的芳烃含量,塔东地区寒武系来源油与上述特征差异迥然,自成一体。优选出的C7—C9轻烃族组成参数可较好地区分大涝坝(N/I较高)、雅克拉(I/P较高)、轮台和库车(A/P较高)与塔东(最大I/P和N/P)等地区的原油。针对单体化合物建立的C8轻烃新指标11DMCYC6/(ctc124TMCYC5+ctc123TMCYC5+cct124TMCYC5)值与(m-+p-)Xyl/nC8值可较好区分塔里木盆地海相油、湖相油与煤成油。
The composition of C8 in crude oil C5-C13 light fraction has been the weak link in the study of oil-gas geochemistry. Based on the previous studies and combined with the light hydrocarbon composition of C7 light hydrocarbons, the C5-C13 light fraction of 40 marine oils, lacustrine oil and coal-forming oil samples from Tarim Basin was analyzed quantitatively Genetic type Crude C5-C13 light distillate family composition characteristics. The oil content of lakes in Dalaoba Dam is higher than that of naphtha, the content of branched-chain paraffins in the marine oil of Yakela oil-gas field is relatively high, while the oil content of some coal in Luntai and Kuche depressions is relatively high, The Cambrian source oil in the area is very different from the above-mentioned characteristics and is self-contained. The preferred parameters of the C7-C9 light hydrocarbon family can better distinguish the flood dam (N / I higher), Jacques (I / P higher), the wheel sets and the Kuche (higher A / P) Tarong (the largest I / P and N / P) and other regions of crude oil. The new index of C8 light hydrocarbon for monomer compounds, 11DMCYC6 / (ctc124TMCYC5 + ctc123TMCYC5 + cct124TMCYC5) and (m- + p-) Xyl / nC8 can be used to distinguish the marine oil, lacustrine oil and coal oil in Tarim Basin .