Geochemical Characteristics of A Novel Kind of Marine Oils from Tarim Basin
Geochemical Characteristics of A Novel Kind of Marine Oils from Tarim Basin
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发表时间：
2012
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通讯作者：
Bao Jianping;Kong Jie;Zhu Cui-shan;Zhang Qiu-cha;Li Mei;L. Yuhong;Z. Wenyan
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作者：
Bao Jianping;Kong Jie;Zhu Cui-shan;Zhang Qiu-cha;Li Mei;L. Yuhong;Z. Wenyan
对塔中52井和塔中162井奥陶系原油进行了分析，结果表明，塔中奥陶系原油的生物标志化合物分布和组成与塔中地区已知的两类海相原油有明显的差异，如塔中奥陶系原油的生物标志化合物组成与塔中奥陶系原油的生物标志化合物组成基本相同，塔中奥陶系原油的生物标志化合物组成与塔中奥陶系原油的生物标志化合物组成基本相同，塔中奥陶系原油的生物标志化合物组成基本相同。首次报道了其三环萜烷系列具有特殊的阶跃模式，相对丰度为C19 C20 C21 C23 C24 C25 C26，C24四环萜烷异常丰富，其相对丰度远高于C26三环萜烷，主要分布在淡水沼泽相和浅湖相烃源岩和原油中，其三萜烷系列中，伽马蜡烷丰度远小于C31高藿烷，但其甾烷和藿烷系列分布与中上奥陶统烃源岩的海相原油非常相似，均异常富含伽马蜡烷和高藿烷，C27-29甾烷中C28甾烷含量较低，C29降藿烷含量较高，其次为C30降藿烷，且全油稳定碳同位素很轻，δ 13 C值小于-30 ‰，根据TZ 12井上奥陶统良四段、良五段富含底栖大型藻类的烃源岩生物标志物资料，发现其C19-26三环萜烷、C24四环萜烷和伽马蜡烷的分布及其相对组成与该类原油非常相似，说明这类新型原油与烃源岩有着密切的关系，因此，塔里木盆地上奥陶统良吕洞组烃源岩及其勘探潜力值得重视。
The crude oils from Ordovician reservoir in TZ52 and TZ162 well have been analyzed,the results showed that there are some evident differences in the distributions and compositions of their biomarker from two kinds of the known marine oils in the middle zone of Tarim Basin.For example,it is firstly reported that its trycyclic terpane series is of special step-like model with C19C20C21C23C24C25C26 in relative abundance,C24 tetracyclic terpane is abnormally abundant and it relative abundance is much more than C26 tricyclic terpanes,which occurs in those source rocks and the crude oils deposited under fresh water swamp and shallow lacustrine facies.As for their triterpane series,the abundance of gammacerane is much less than C31 homohopanes,but the distributions of their sterane and hopane series are very similar to the marine oils derived from middle to middle-upper Ordovician source rocks such as with abnormally abundant pregnane and homopregnane,relatively lower C28 sterane in C27-29 steranes and more abundant C29 norhopane secondary to C30 hopane.In addition,their stable carbon isotope of whole oil is very light and their δ13C values are less than-30‰ like other marine oils,showing that this kind of crude oil is marine.Based on the biomarker data in the source rocks with abundant benthic marco-algae from 4-5 member of Lianglitage formation of upper Ordovician in TZ12 well,it is found that their distribution and the relative composition of its C19-26 tricyclic terpane,C24 tetracyclic terpane and gammacerane is very similar to this kind of crude oils,showing that there is a close relationship between this kind of novel crude oils and the source rocks.Therefore,it should pay much more attention to the source rocks and their exploration potential from Lianglitage Formation of upper Ordovician in Tarim Basin.