Effects of U-ore on the chemical and isotopic composition of products of hydrous pyrolysis of organic matter

Abstract In order to investigate the impact of U-ore on organic matter maturation and isotopic fractionation, we designed hydrous pyrolysis experiments on Type-II kerogen samples, supposing that the water and water–mineral interaction play a role. U-ore was set as the variable for comparison. Meanwh...

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Autores principales:	Yu-Wen Cai, Shui-Chang Zhang, Kun He, Jing-Kui Mi, Wen-Long Zhang, Xiao-Mei Wang, Hua-Jian Wang, Chao-Dong Wu
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2017
Materias:	Organic–inorganic interaction Hydrous pyrolysis Stable isotopes U-ore Carbocation mechanism Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/f640c10e394a4f428f307721a8d74046
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spelling	oai:doaj.org-article:f640c10e394a4f428f307721a8d740462021-12-02T00:52:51ZEffects of U-ore on the chemical and isotopic composition of products of hydrous pyrolysis of organic matter10.1007/s12182-017-0161-61672-51071995-8226https://doaj.org/article/f640c10e394a4f428f307721a8d740462017-05-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-017-0161-6https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract In order to investigate the impact of U-ore on organic matter maturation and isotopic fractionation, we designed hydrous pyrolysis experiments on Type-II kerogen samples, supposing that the water and water–mineral interaction play a role. U-ore was set as the variable for comparison. Meanwhile, anhydrous pyrolysis under the same conditions was carried out as the control experiments. The determination of liquid products indicates that the presence of water and minerals obviously enhanced the yields of C15+ and the amounts of hydrocarbon and non-hydrocarbon gases. Such results may be attributed to water-organic matter reaction in the high-temperature system, which can provide additional hydrogen and oxygen for the generation of gas and liquid products from organic matter. It is found that δD values of hydrocarbon gases generated in both hydrous pyrolysis experiments are much lower than those in anhydrous pyrolysis. What is more, δD values are lower in the hydrous pyrolysis with uranium ore. Therefore, we can infer that water-derived hydrogen played a significant role during the kerogen thermal evolution and the hydrocarbon generation in our experiments. Isotopic exchange was facilitated by the reversible equilibration between reaction intermediaries with hydrogen under hydrothermal conditions with uranium ore. Carbon isotopic fractionations of hydrocarbon gases were somehow affected by the presence of water and the uranium ore. The increased level of i-C4/n-C4 ratios for gas products in hydrous pyrolysis implied the carbocation mechanism for water-kerogen reactions.Yu-Wen CaiShui-Chang ZhangKun HeJing-Kui MiWen-Long ZhangXiao-Mei WangHua-Jian WangChao-Dong WuKeAi Communications Co., Ltd.articleOrganic–inorganic interactionHydrous pyrolysisStable isotopesU-oreCarbocation mechanismScienceQPetrologyQE420-499ENPetroleum Science, Vol 14, Iss 2, Pp 315-329 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Organic–inorganic interaction Hydrous pyrolysis Stable isotopes U-ore Carbocation mechanism Science Q Petrology QE420-499
spellingShingle	Organic–inorganic interaction Hydrous pyrolysis Stable isotopes U-ore Carbocation mechanism Science Q Petrology QE420-499 Yu-Wen Cai Shui-Chang Zhang Kun He Jing-Kui Mi Wen-Long Zhang Xiao-Mei Wang Hua-Jian Wang Chao-Dong Wu Effects of U-ore on the chemical and isotopic composition of products of hydrous pyrolysis of organic matter
description	Abstract In order to investigate the impact of U-ore on organic matter maturation and isotopic fractionation, we designed hydrous pyrolysis experiments on Type-II kerogen samples, supposing that the water and water–mineral interaction play a role. U-ore was set as the variable for comparison. Meanwhile, anhydrous pyrolysis under the same conditions was carried out as the control experiments. The determination of liquid products indicates that the presence of water and minerals obviously enhanced the yields of C15+ and the amounts of hydrocarbon and non-hydrocarbon gases. Such results may be attributed to water-organic matter reaction in the high-temperature system, which can provide additional hydrogen and oxygen for the generation of gas and liquid products from organic matter. It is found that δD values of hydrocarbon gases generated in both hydrous pyrolysis experiments are much lower than those in anhydrous pyrolysis. What is more, δD values are lower in the hydrous pyrolysis with uranium ore. Therefore, we can infer that water-derived hydrogen played a significant role during the kerogen thermal evolution and the hydrocarbon generation in our experiments. Isotopic exchange was facilitated by the reversible equilibration between reaction intermediaries with hydrogen under hydrothermal conditions with uranium ore. Carbon isotopic fractionations of hydrocarbon gases were somehow affected by the presence of water and the uranium ore. The increased level of i-C4/n-C4 ratios for gas products in hydrous pyrolysis implied the carbocation mechanism for water-kerogen reactions.
format	article
author	Yu-Wen Cai Shui-Chang Zhang Kun He Jing-Kui Mi Wen-Long Zhang Xiao-Mei Wang Hua-Jian Wang Chao-Dong Wu
author_facet	Yu-Wen Cai Shui-Chang Zhang Kun He Jing-Kui Mi Wen-Long Zhang Xiao-Mei Wang Hua-Jian Wang Chao-Dong Wu
author_sort	Yu-Wen Cai
title	Effects of U-ore on the chemical and isotopic composition of products of hydrous pyrolysis of organic matter
title_short	Effects of U-ore on the chemical and isotopic composition of products of hydrous pyrolysis of organic matter
title_full	Effects of U-ore on the chemical and isotopic composition of products of hydrous pyrolysis of organic matter
title_fullStr	Effects of U-ore on the chemical and isotopic composition of products of hydrous pyrolysis of organic matter
title_full_unstemmed	Effects of U-ore on the chemical and isotopic composition of products of hydrous pyrolysis of organic matter
title_sort	effects of u-ore on the chemical and isotopic composition of products of hydrous pyrolysis of organic matter
publisher	KeAi Communications Co., Ltd.
publishDate	2017
url	https://doaj.org/article/f640c10e394a4f428f307721a8d74046
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Effects of U-ore on the chemical and isotopic composition of products of hydrous pyrolysis of organic matter

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