收稿日期: 2013-06-21
修回日期: 2013-07-26
网络出版日期: 2014-01-10
基金资助
国家自然科学青年基金项目“不同成因凝析油的地球化学鉴别”(编号：41303037）资助.
Geochemical Characteristics and Origins of the Oils in Wushi Sag,Tarim Basin
Received date: 2013-06-21
Revised date: 2013-07-26
Online published: 2014-01-10
塔里木盆地乌什凹陷乌参1井、神木1井和神木2井的相继突破，揭示了该区具有广阔的油气勘探前景。通过饱和烃和轻烃气相色谱对乌什凹陷原油地球化学特征进行了全面的分析，并与塔里木盆地典型的陆相原油和湖(海）相原油进行了对比。神木2井和乌参1井原油Pr/Ph值分别为2.35和3.53，表现出典型的煤成烃特征。乌什凹陷原油具有相对较高的芳烃(苯和甲苯）、甲基环己烷和环己烷含量，而环戊烷和无环烃类相对含量较低，说明陆源有机质贡献较大。乌什凹陷原油庚烷指数介于25.0%~27.6%之间，异庚烷指数介于2.5%~2.7%之间，处在高成熟早期阶段。乌什凹陷原油未经历水洗和生物降解作用，但发生了较为明显的蒸发分馏作用，导致轻烃组分中芳烃含量增加，而正构烷烃含量减少。通过OCSD—C7轻烃星状图和C7轻烃系统三角图分析，乌什凹陷原油和迪那2气田凝析油同属于陆相原油，来源于腐殖型有机质，和克拉苏构造带及塔中1气田来源于腐泥型有机质的湖(海）相原油存在明显差别。综合上述分析，乌什凹陷原油主要为来自于侏罗系煤系烃源岩的煤成油。
龚德瑜，李明，李启明，肖中尧，陶小晚，黄士鹏 . 塔里木盆地乌什凹陷原油地球化学特征及油源分析[J]. 天然气地球科学, 2014 , 25(1) : 62 -69 . DOI: 10.11764/j.issn.1672-1926.2014.01.62
Great exploration potential in Wushi Sag has been revealed by the successive breakthroughs in Wells of Wucan1,Shenmu1 and Shenmu2.By using gas chromatographs of saturated and light hydrocarbons,we comprehensively studied the geochemical characteristics of the oils in the Wushi Sag and compared them with typical terrestrial and lacustrine (marine) oils in other parts of the Tarim Basin.The pristane/phytane ratio in the Shenmu2 and Wucan1 Wells is 2.35 and 3.53,respectively,obviously demonstrating that it is of coal-derived origin.The oils in the Wushi Sag has a relatively high content of aromatics(benzene and toluene),methylcyclohexane and cyclohexane while a low content of cyclopentane and acyclic hydrocarbons,indicating that a great contribution from the terringenous organic matters was made.The thermal maturity of the oils in the Wushi Sag is at the early period of the high-mature stage with the heptane index ranging from 25.0% to 27.6% and the isoheptane index ranging from 2.5% to 2.7%,respectively.Water washing and biodegradation of oils in the Wushi Sag were not observed.The oils in the study area have obviously experienced the evaporative fraction,resulting in the increase of aromatics and the decrease in n-alkanes.By means of Oil Correlation Star Diagram(OCSD）and the Triangular diagrams of C7 hydrocarbon，the oils in Wushi Sag was derived from humic organic matters,the same as those in the Dina2 gas-condensates field,which were distinctively different from the lacustrine and marine oils in the Kelasu structure and Tazhong1 Gasfield.From all geochemical features above,it is concluded that the oils in the Wushi Sag were derived from the Jurassic coal measures.
Key words： Tarim Basin; Wushi Sag; Oil correlation; Light hydrocarbon; Terrestrial oils
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