收稿日期: 2010-04-01
修回日期: 2011-07-07
网络出版日期: 2011-10-10
基金资助
国家自然科学基金项目（编号：40973041）资助.
Geochemical Characteristics of Saturated Hydrocarbon and Its Genesis in Hure Oilfield of Western Qaidam Basin
Received date: 2010-04-01
Revised date: 2011-07-07
Online published: 2011-10-10
尕斯库勒油田是柴达木盆地最大的油田，通过GC\|MS分析技术，系统剖析了尕斯库勒油田原油的地球化学特征。研究结果表明：正构烷烃呈偶奇优势,其中浅部油藏中有部分原油正构烷烃缺乏，遭受到轻度的生物降解。对于正常原油，均具有较低的姥植比，同时具有含量丰富的伽马蜡烷和C35升藿烷，揭示了原油形成于强还原咸水环境，对比深部E13油藏和浅部N1—N12油藏，浅部油藏的成油环境的古盐度略低于深部油藏；原油中C21-/C22+值在1.02~1.71之间，且具有高含量的C27甾烷，指示了其母质来源以菌藻类低等水生生物为主；原油中C29αββ/（αββ+ααα）值以及Ts/Tm值都较低，都表现出了低熟油的特征，同时C2920S/（20S+20R）值普遍偏低，在深部E13油藏该值分布在0.31~0.40之间，而在浅部N1—N12油藏该值相对较低，分布在0.29~0.36之间，深部油藏的成熟度略高于浅部油藏。
莫晓靥, 张敏, 张俊 . 柴达木盆地尕斯库勒油田原油饱和烃地球化学特征及成因研究[J]. 天然气地球科学, 2011 , 22(5) : 848 -853 . DOI: 10.11764/j.issn.1672-1926.2011.05.848
Hure oilfield is the biggest oil field in the Qaidam basin.In this paper,we comprehensively integrate the geochemical characteristics of saturated hydrocarbon by means of GC-MS analysis.The results show that the crude oil has even\|odd carbon predominance for n\|alkanes,where biogenicdegradation of crude oil in the shallow reservoir caused the absence of part of n-alkane serials.The normal oil has low Pr/Ph ratios,abundance of gammacerane and C35 homohopane,indicating that the crude oil was formed in strongly reducing salt water environment.The ancient salinity of sedimentary environment forN1-N12 crude oils in shallow reservoir is slightly higher than that of E13 crude oils in deep one.The crude oil has the C21-/C22+ ratio of 1.02-1.71,and the high abundance of C27 sterane,confirming they were soured from bacteria and algae.The low ratios of C29 sterane 20S/（20S+20R）and Ts/Tm suggest the low mature oil.The ratio of C29 sterane 20S/（20S+20R）in the deep E13and shallow N1-N12 reservoir is in range of 0.31-0.40 and 0.29-0.36,respectively.This result indicates that the thermal maturity of oil in the deep reservoir is higher than that in the shallow one.
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