We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Study on diamondoids and genetic mechanism of condensates from the Kela 2 structure in the Kuche Depression.
- Authors
Bao Jian-ping; Zhu Cui-shan; Sheri Xu
- Abstract
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;ROvalues 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.
- Subjects
DIAMONDOIDS; BIOLOGICAL tags; GAS fields; HYDROCARBONS; CHROMATOGRAMS
- Publication
Natural Gas Geoscience, 2018, Vol 29, Issue 9, p1
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2018.07.015