| Unusual N—Alkane Distributions in Extracts from Marine Carbonate Rocks at High Levels of Maturity and Overmaturity |
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| 引用本文： | 李景贵,R.PAUL PHILP,崔明中.Unusual N—Alkane Distributions in Extracts from Marine Carbonate Rocks at High Levels of Maturity and Overmaturity[J].中国地球化学学报,2002,21(4):322-333. |
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| 作者姓名： | 李景贵 R.PAUL PHILP 崔明中 |
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| 作者单位： | 李景贵,崔明中(State Key Laboratory of Gas Geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000, China);R.PAUL PHILP(School of Geology and Geophysics, University of Oklahoma, Norman, OK. 73019, U. S. A) |
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| 摘 要： |
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| 关 键 词： | 海藻 中国 海相碳酸盐岩 链烷 双峰分面 成熟期 |
Unusual N-alkane distributions in extracts from marine carbonate rocks at high levels of maturity and overmaturity |
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| Li?Jinggui,R.?Paul?Philp,Cui?Mingzhong.Unusual N-alkane distributions in extracts from marine carbonate rocks at high levels of maturity and overmaturity[J].Chinese Journal of Geochemistry,2002,21(4):322-333. |
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| Authors: | Li Jinggui R Paul Philp Cui Mingzhong |
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| Institution: | (1) State Key Laboratory of Gas Geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, 730000 Lanzhou, China;(2) School of Geology and Geophysics, University of Oklahoma, 73019 Norman, OK, USA |
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| Abstract: | N-alkanes in extracts from possible carbonate source rocks of the Lower Ordovician Majiagou Formation in the central gas field
of the Shanganning Basin and the Upper Sinian Dengying Formation in the Weiyuan gas field of the Sichuan Basin, are characterized
by bimodal distributions with the dominant carbon numbers in the range C17-C21 and C25-C29. In most samples, the lower carbon number components are present in greater abundance than the higher carbon number ones.
Most samples contain significant concentrations of waxy hydrocarbons (C22+) with C21-/C22+ ratios between 0.50 to 3. 16, and an average value of 1. 34. The n-alkanes in extracts of outcrops and shallow core samples
of Upper Proterozoic and Lower Palaeozoic carbonate rocks in the western and southern parts of the North China Basin are of
unimodal distributions dominated by n-alkanes maximizing in the C25-C29 range. These extracts have very high concentrations of waxy hydrocarbons with C21-/C22+ ratios all < 1. 0, ranging from 0. 14 to 0. 90 and averaging 0. 36. All of the extracts have a marked odd/even predominance
in the high molecular weight n-alkane range regardless of whether they are from shallow or deep cores or out-crop samples.
Simulation experiments were performed using typical sapropelic-type kerogens from the immature Sinian Lower Xiamalin Formation
carbonate-rich shales collected at Jixian, Hebei Province, North China Basin, and the contemporary microplanktonic blue-green
algaeSpirulina subsala. Results indicate that the unusual distribution of n-alkanes in the extracts of Upper Proterozoic and Lower Palaeozoic carbonate
rocks possibly originated from algae in the source rocks at high levels of maturity and overmaturity.
This research project was financially supported by the Chinese Academy of Sciences (Grant No. KZCX2-111 ). |
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| Keywords: | China marine carbonate source rock high maturity and overmaturity n-alkane bimodal distribution odd/even predominance alga |
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