RESP  > 地球快报-2018年第10期
DOI: 10.1016/j.gca.2017.10.012
篇名:
The influence of shale depositional fabric on the kinetics of hydrocarbon generation through control of mineral surface contact area on clay catalysis
作者: Rahman, Habibur M.; Kennedy, Martin; Lohr, Stefan; Dewhurst, David N.; Sherwood, Neil; Yang, Shengyu; Horsfield, Brian
通讯作者: Rahman, HM (reprint author), Macquarie Univ, Dept Earth & Planetary Sci, Sydney, NSW 2109, Australia.
发表期刊: GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN: 0016-7037
EISSN: 1872-9533
出版年: 2018
卷: 220, 页码:429-448
发表日期: 2018
语种: 英语
领域: 地球科学 ; 资源环境 ; 气候变化
英文摘要: Accurately assessing the temperature and hence the depth and timing of hydrocarbon generation is a critical step in the characterization of a petroleum system. Clay catalysis is a potentially significant modifier of hydrocarbon generation temperature, but experimental studies of clay catalysis show inconsistent or contradictory results. This study tests the hypothesis that source rock fabric itself is an influence on clay mineral catalysis as it controls the extent to which organic matter and clay minerals are physically associated. Two endmember clay-organic fabrics distinguish the source rocks studied: (1) a particulate fabric where organic matter is present as discrete, >5 mu m particles and (2) a nanocomposite fabric in which amorphous organic matter is associated with clay mineral surfaces at sub-micron scale. High-resolution electron imaging and bulk geochemical characterisation confirm that samples of the Miocene Monterey Formation (California) are representative of the nanocomposite source rock endmember, whereas samples from the Permian Stuart Range Formation (South Australia) represent the particulate source rock endmember. Kinetic experiments are performed on paired whole rock and kerogen isolate samples from these two formations using open system, non-isothermal pyrolysis at three different heating rates (0.7, 2 and 5 K/min) to determine the effects of the different shale fabrics on hydrocarbon generation kinetics. Extrapolation to a modelled geological heating rate shows a 20 degrees C reduction in the onset temperature of hydrocarbon generation in Monterey Formation whole rock samples relative to paired kerogen isolates. This result is consistent with the Monterey Formations's nanocomposite fabric where clay catalysis can proceed because reactive clay minerals are intimately associated with organic matter. By contrast, there is no significant difference in the modelled hydrocarbon generation temperature of paired whole rock and kerogen isolates from the Stuart Range Formation. This is consistent with its particulate fabric, where relatively large, discrete organic particles have limited contact with the mineral matrix and the clay minerals are mainly diagenetic and physically segregated within pores. While heating rate may have a control on mineral matrix effects, this result shows that the extent to which organic matter and clay minerals are physically associated could have a significant effect on the timing of hydrocarbon generation, and is a function of the depositional environment and detrital vs diagenetic origin of clay minerals in source rocks. (C) 2017 Elsevier Ltd. All rights reserved.
英文关键词: Hydrocarbon generation kinetics ; Clay catalysis ; Shale fabric ; Organoclay nanocomposite ; Monterey Formation ; Stuart Range Formation
收录类别: SCI-E
WOS记录号: WOS:000416502300026
WOS关键词: MIOCENE MONTEREY FORMATION ; ORGANIC-CARBON PRESERVATION ; ROCK-EVAL PYROLYSIS ; PETROLEUM FORMATION ; GAS GENERATION ; BLACK SHALE ; LABORATORY EXPERIMENTS ; SEDIMENTARY BASINS ; KEROGEN PYROLYSIS ; SYSTEM PYROLYSIS
WOS学科: Geochemistry & Geophysics
WOS研究方向: Geochemistry & Geophysics
Citation statistics:
被引频次[WOS]:2   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
条目标识符: http://119.78.100.173/handle/2MONF3CL/87297
Appears in Collections:地球快报-2018年第10期

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Recommended Citation:
Rahman, Habibur M.,Kennedy, Martin,Lohr, Stefan,et al. The influence of shale depositional fabric on the kinetics of hydrocarbon generation through control of mineral surface contact area on clay catalysis[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2018,220:429-448.
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