1. Variation in abundance and distribution of diamondoids during oil cracking
- Author
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Fang, Chenchen, Xiong, Yongqiang, Liang, Qianyong, and Li, Yun
- Subjects
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DISTRIBUTION (Probability theory) , *THERMAL analysis , *GAS chromatography/Mass spectrometry (GC-MS) , *PARAMETER estimation , *ORGANIC compounds , *SIMULATION methods & models , *CRACKING process (Petroleum industry) - Abstract
Abstract: In this study, changes in the abundance and distribution of diamondoids in petroleum with thermal maturity were investigated by a simulation oil cracking experiment. Highly sensitive and selective gas chromatography–triple quadrupole mass spectrometry (GC–MS–MS) was employed to quantify diamondoids at ppm and sub-ppm levels. The results indicate that diamondoids were generated primarily within the maturity range 1.0–2.1% EasyRo and destroyed at high thermal maturity (>2.1% EasyRo). Hence, the occurrence of high concentrations of diamondoids probably corresponds to the maturity range from the wet gas to the early dry gas stage (i.e., 1.5–2.5% EasyRo). Good correlations were observed between a few ratios of diamondoids (i.e., EAI, DMAI-1, DMDI-1 and TMAI-1) and EasyRo. This finding indicates that these parameters may be useful maturity indices for organic matter from the late oil window to the dry gas window. [Copyright &y& Elsevier]
- Published
- 2012
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