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Carbon isotopic fractionation by desorption of shale gases

Xiaofeng Wang  Xiaofu Li  Xiangzeng Wang  Baoguang Shi  Xiaorong Luo  Lixia Zhang  Yuhong Lei  Chengfu Jiang  Qiang Meng  
【摘要】:Geochemical studies of shale gas and conventional reservoirs within the Triassic Yanchang Formation of Xiasiwan and Yongning Field,Ordos Basin show that methane is isotopically depleted in13C as compared to d~(13)C_1calculated by the Ro based on the relationship between d~(13)C_1and Ro.Geochemical fractionation during the adsorption/desorption process of shale system may play a significant part in influencing d~(13)C_1values of shale gas.Two shale core samples from confined coring of the Yanchang Formation were adopted segmented desorption experiments to examine this phenomenon.The results show that the d~(13)C_1of desorbed gas changes little in the first few phases of the experiments at low desorption levels,but become less negative rapidly when the fraction of desorbed methane exceeds 85%.The desorption process for the last 15%fraction of the methane from the shale samples shows a wide variation in d~(13)C_1from 49‰to 33.9‰.Moreover,d~(13)C_1of all desorbed methane from the shale samples is substantially depleted in13C than that calculated by Ro,according to Stahl and Carey's d~(13)C_1e Ro equation for natural gas generated from sapropelic organic matter.This shows some gases with isotopically enriched in13C cannot be desorbed under the temperature and pressure conditions of the desorption experiments.This observation may be the real reason for the d~(13)C_1of shale gases and conventional reservoirs becomes more negative in Xiasiwan and Yongning Fields,Ordos Basin.The magnitude of the deviation between the d~(13)C_1of shale gas and that calculated by Ro may be related to the adsorption capacity of shale or the proportion of absorbed gases.In this way,we may be able to evaluate the relative adsorption capacity of shale in geological conditions by d~(13)C_1of the shale gas,or by d~(13)C_1of conventional gas which generated by the shale with certainty.The d~(13)C_1of conventional gas in Dingbian and Yingwang Fields have no deviation because the TOC value of the hydrocarbon source rock is relatively low.

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