摘要
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 research about C8＋in C5-C13 light hydrocarbons is very poor in oil and gas geochemistry.Based on the gas chromatography quantitatively analysis of C5-C13 light hydrocarbons of 40 marine,lacustrine and coal-formed crude oils in Tarim Basin,the group composition of C5-C13 light hydrocarbons have been analyzed.Naphthenes is relatively abundant in crude oils from the Dalaoba oilfield,branched-alkanes are more enriched in crude oils from the Yakela oilfield,while aromatics in C6-C13 light hydrocarbons are more concentrated in some oil samples from the Luntai region and the Kuqa Depression.Oils derived from Cambrian source rocks are completely different from the above characteristics.A series of parameters of C7-C9 light hydrocarbons are preferably selected to distinguish crude oils from Dalaoba（with high N/I）,Yakela（with high I/P）and Luntai Oilfields and Kuche Depression（with highest I/P and N/P）,respectively.According to the compounds,11DMCYC6/（ctc124TMCYC5＋ctc123TMCYC5＋cct124TMCYC5）and（m-＋p-）Xyl/nC8 new index can be applied to distinguish marine,lacustrine and coal-formed crude oils in Tarim Basin.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2014年第12期2003-2013,共11页
Natural Gas Geoscience
基金
高等学校博士学科点专项科研基金新教师类资助课题(编号:20124220120001)资助
关键词
塔里木盆地
C5—C13轻馏分
轻烃
原油
地球化学
Tarim Basin
C5-C13light hydrocarbon fraction
Light hydrocarbon
Crude oil
Geochemistry
