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

Petroleum Science 2017年第2期14卷 315-329页

作者： Yu-Wen Cai Shui-Chang Zhang Kun He Jing-Kui Mi Wen-Long Zhang Xiao-Mei Wang Hua-Jian Wang Chao-Dong Wu School of Earth and Space Sciences Peking University Beijing 100087 China Research Institute of Petroleum Exploration and Development (RIPED) Beijing 100083 China State Key Laboratory of Enhanced Oil Recovery Beijing 100083 China

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 ***,anhydrous pyrolysis under the same conditions was carried out as the control *** determination of liquid products indicates that the presence of water and minerals obviously enhanced the yields of C（15＋） and the amounts of hydrocarbon and nonhydrocarbon *** results may be attributed to waterorganic matter reaction in the high-temperature system,which can provide additional hydrogen and oxygen for the generation of gas and liquid products from organic *** is found that δD values of hydrocarbon gases generated in both hydrous pyrolysis experiments are much lower than those in anhydrous *** is more,δD values are lower in the hydrous pyrolysis with uranium ***,we can infer that water-derived hydrogen played a significant role during the kerogen thermal evolution and the hydrocarbon generation in our *** exchange was facilitated by the reversible equilibration between reaction intermediaries with hydrogen under hydrothermal conditions with uranium *** isotopic fractionations of hydrocarbon gases were somehow affected by the presence of water and the uranium *** increased level of i-C4/n-C4ratios for gas products in hydrous pyrolysis implied the carbocation mechanism for water-kerogen reactions.

关键词： Organic-inorganic interaction Hydrous pyrolysis Stable isotopes U-ore carbocation mechanism

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