Intramolecular carbon isotopic fractionation of propane via thermochemical sulfate reduction(TSR)in natural gas reservoirsOA
Thermochemical sulfate reduction(TSR)is an important organic-inorganic reaction that occurs within sedimentary basins and alters the original chemical compositions and isotopic structures of hydrocarbons in natural gases.We used the GC-Py-GC-IRMS method to study TSR and obtained a novel finding related to intramolecular carbon isotope fractionation in natural propane.The results show that theΔC-T(δ^(13)C_(central)-13 C_(terminal))andδ^(13)C_(central)values significantly increased to 44.7‰and 11.9‰,respectively,with increasing TSR alteration.In contrast,the 13 C_(terminal)values of propane remained largely unaltered by the TSR reaction.This difference in position-specific isotope fractionation can be attributed to the central carbon’s reactivity being higher than that of terminal carbon during TSR.In sum,the results indicate that theδ^(13)C_(terminal)values of propane can serve as robust indicators for source rock identification of natural gas altered by post-generation reactions such as TSR and anaerobic microbial oxidation.
Peng Liu;Xiaofeng Wang;Hanlin Liu;Juske Horita;Guoxiao Zhou;Hongping Bao;Ying Lin;Ruiliang Guo;Dongdong Zhang;Wenhui Liu
College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an,710054,ChinaState Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an,710069,ChinaResearch Institute of Petroleum Exploration and Development,PetroChina,Beijing,100083,China China National Petroleum Corporation Key Laboratory of Coal-Rock Gas,Langfang,065007,China National Energy Shale Gas R&D(Experiment)Center,Langfang,065007,ChinaDepartment of Geosciences,Texas Tech University,Lubbock,TX,79409,USAExploration and Development Research Institute of PetroChina Changqing Oilfield Company,Xi’an,710018,ChinaExploration and Development Research Institute of PetroChina Changqing Oilfield Company,Xi’an,710018,Chinaartment of Earth and Planetary Sciences,University of California,Riverside,Riverside,CA,92521,USASchool of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an,710065,ChinaState Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an,710069,ChinaState Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an,710069,China
天文与地球科学
Thermochemical sulfate reduction(TSR)HydrocarbonsPropanePosition-specific isotope
《Natural Gas Industry B》 2026 (1)
P.1-8,8
supported by the Helium Enrichment and Detection in Natural Gas Reservoirs Related to Oil and Gas Fields project(Grant No.2025ZD1010500)the Deep Earth Probe and Mineral Resources Exploration―National Science and Technology Major Project.-。
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