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Study on diamondoids and genetic mechanism of condensates from the Kela 2 structure in the Kuche Depression

Bao Jian-ping,Zhu Cui-shan,Shen Xu   

  1. Geochemistry Department,Key Laboratory of Oil & Gas Resource and Exploration Technology,Yangtze University,Wuhan 430100,China
  • Received:2018-06-22 Revised:2018-08-20 Online:2018-09-10 Published:2018-09-10

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;C19-26tricyclic 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.

Key words: Diamondoid hydrocarbons, Biomarkers, Cracking extent, Condensates, Kela 2 structure, Kuqa Depression

CLC Number: 

  • TE122.1+13

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