收稿日期: 2016-11-09
修回日期: 2016-12-26
网络出版日期: 2017-02-10
基金资助
中国石化科技部项目(编号：P07021;G5800-16-ZS-KJB009);国家重点基础发展规划“973”项目(编号：2012CB21480);国家油气重大专项(编号：2011ZX05005)联合资助.
Maturity and oil-cracking of the Ordovician oils from Tahe Oilfield,Tarim Basin,NW China
Received date: 2016-11-09
Revised date: 2016-12-26
Online published: 2017-02-10
使用生物标志化合物成熟度参数、芳烃成熟度参数和金刚烷成熟度参数对塔里木盆地塔河油田奥陶系原油成熟度进行了研究，Ts/(Ts+Tm)、C29Ts/(C29H+C29Ts)成熟度参数表明奥陶系原油基本上未达到凝析油阶段，这与芳烃甲基菲成熟度参数所反映的成熟度基本相同，而金刚烷指数MAI、MDI反映的成熟度约为1.1%~1.6%，高于生物标志化合物及甲基菲指数所反映的成熟度，成熟度的差异性反映了奥陶系原油经历了多期油气充注。原油金刚烷绝对定量分析表明甲基双金刚烷含量在Ts/(Ts+Tm)<0.55之前分布较为离散，增加缓慢，而在Ts/(Ts+Tm)>0.55之后增加迅速，对塔河油田不同层位原油金刚烷含量分析表明，塔河油田原油金刚烷基线应在15×10-6，总体而言,绝大多数奥陶系原油甲基双金刚烷含量分布在(4~35)×10-6之间，原油裂解程度基本上小于50%，表明塔河油田奥陶系深层仍具有石油勘探前景。奥陶系原油甲基双金刚烷含量呈现东高西低、南高北低的特点，指示了塔河油田奥陶系原油存在由东向西、由南向北运移的特点,与原油密度、成熟度参数反映的运移方向一致。
马安来，金之钧，朱翠山 . 塔里木盆地塔河油田奥陶系原油成熟度及裂解程度研究[J]. 天然气地球科学, 2017 , 28(2) : 313 -323 . DOI: 10.11764/j.issn.1672-1926.2017.01.003
The maturity of the Ordovician oils from Tahe Oilfield of Tarim Basin,NW China was assessed by various maturity parameters,such as biomarkers,aromatic parameters and diamondoid parameters.Both Ts/(Ts+Tm) and C29Ts/(C29H+C29Ts) values indicated that the maturity of oils has not reached the condensates stages,which is in consistent with the maturity obtained by MPI-1.However the diamondoid maturity suggested that the oil maturity is in the range of 1.1%-1.6% RO,which is obviously higher than that of the maturity obtained by biomarker and MPI-1.This discrepancy of maturity may reflect the Ordovician reservoir have multiple filling history.The concentration of methyldiamantane suggested that the methyldiamantane concentration of oils is scattered and increase slowly when Ts/(Ts+Tm) value is lower than 0.55,and the content increases rapidly when Ts/(Ts+Tm) value is higher than 0.55.Based on the diamondoid concentration of oils from different age,it is proposed that the diamondoid baseline is about 15×10-6 in the Tahe Oilfield.In general,the concentration of methyldiamantane of most Ordovician oils ranges from 4×10-6 to 35×10-6,suggesting that the degree of oil-cracking is lower than 50% and the deep Ordovician has the potential of oil exploration.The distribution of the concentration of methyldiamantane is characterized by high in east,low in west,high in south and low in north,suggesting two migration pathways are from south to north, from east to west, respectively, which is consistent to the migration results obtained from oil density and maturity parameters such as Ts/(Ts+Tm).
Key words： Diamondoid; Adamantane; Diamantane; Oil-cracking; Oil maturity; Ordovician; Tahe Oilfield
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