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- W2074927171 abstract "Abstract This study investigates the origin and evolution of adamantanes and diamantanes in petroleum, based on the results of pyrolysis experiments on different group components of crude oil and quantitative analyses of diamondoids in the pyrolysates. Results show that the formation and evolution of lower diamondoids in petroleum occurs in three main stages: (1) early generation during the formation of oil ( 1.0% EasyRo), and (3) destruction during the late period of oil cracking. The lower diamondoids that formed during the early generation stage include free diamondoids present in the original oil and diamondoids released or transformed from group fractions of oil at relatively low levels of maturity ( 2.3% EasyRo in adamantanes and >2.7% EasyRo in diamantanes. The thermal stability of diamondoid compounds becomes a critical factor influencing the isomerization index of diamondoids during the destruction stage. The isomerization ratios of some diamondoids (e.g., MAI, DMAI-1, DMAI-2, TMAI-1, TMAI-2, and EAI) are well correlated with maturity within certain maturity ranges, indicating that isomerization indices provide good estimates of the thermal maturity of highly cracked oils. Bivariate diagrams of concentration versus isomerization indices of diamondoids are introduced to assess the maturity of oils; these diagrams provide more refined maturity assessments over a wider range of maturities than are available from single diamondoid parameters only." @default.
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- W2074927171 date "2013-11-01" @default.
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- W2074927171 title "The origin and evolution of adamantanes and diamantanes in petroleum" @default.
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- W2074927171 doi "https://doi.org/10.1016/j.gca.2013.06.027" @default.
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