收稿日期: 2018-06-22
修回日期: 2018-08-20
网络出版日期: 2018-11-08
基金资助
国家自然科学基金项目(编号：41772119;41272169)联合资助.
Study on diamondoids and genetic mechanism of condensates from the Kela 2 structure in the Kuche Depression
Received date: 2018-06-22
Revised date: 2018-08-20
Online published: 2018-11-08
包建平, 朱翠山, 申旭 . 金刚烷类化合物与库车坳陷克拉2构造凝析油的形成机理研究[J]. 天然气地球科学, 2018 , 29(9) : 1217 -1230 . DOI: 10.11764/j.issn.1672-1926.2018.07.015
By aid of gas chromatography and gas chromatography-mass spectrometer，light hydrocarbons，chain alkanes，polycyclic aromatic hydrocarbons，biomarkers such as steranes and terpanes，and diamondoids in crude oils from the Kela 2 structure and Yaha structural belts in the Kuqa Depression were analyzed. The results show that various aromatic hydrocarbons are abnormally abundant in C6-8 light hydrocarbons and whole oils;C19-26tricyclic terpanes in m/z 191 mass chromatogram,and pregnane,homopregnane in m/z 217 mass chromatogram are relatively high in crude oils from the Kela 2 structure,but these biomarkers in similar crude oils from the Yaha structural belts are obviously low,suggesting that crude oils from the Kela 2 structure may have an unusual genetic mechanism. Moreover,alkyl adamantanes and alkyl diamantanes are detected in crude oils from the Kela 2 structure and Yaha structural belts,but alkyl trimantanes are only present in condensates from the Kela 2 structure,and the concentrations of various diamondoids in condensates from the Kela 2 structure are more an order of magnitude than those in crude oils from the Yaha structural belts,showing that maturity of condensates from the Kela 2 structure is much more than those of crude oils from the Yaha structural belts. Based on the relationship between MAI,MDI and RO values,RO values are about 1.9% in condensates from the Kela 2 structure,and their cracking extent may be more than 97%,showing that those condensates are typical cracking oils;RO values are about 1.2%-1.4% in crude oils from the Yaha structural belts,cracking extent of crude oils from different structure units varies from 20% to 80%,depending on filling extent of high-mature oils and gas in late period.
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