| 新疆准噶尔盆地独山子泥火山天然气地球化学特征 |
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| 关键词:Junggar Basin mud volcano natural gas carbon isotope anaerobic biodegradation |
| 基金项目:国家973计划项目(编号: 2012CB214701-05);中国科学院战略性先导科技专项(编号: XDA05120204);国家自然科学基金项目(编号: 41172169);中国科学院知识创新工程重要方向项目(编号: KZCX2-EW-104) |
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| Geochemical Characteristics of Natural Gas from Dushanzi Mud Volcano in Junggar Basin, Xinjiang |
| Dushanzi mud volcano is located on the axis of the Dushanzi anticline in northern Tianshan piedmont depression, which lies in the southern margin of the Junggar Basin, northwestern China. This study aims to identify the origin of the natural gases released by Dushanzi mud volcano by analyzing their geochemical characteristics, and the result shows that the gases should be attributed to a thermogenic source withδ13C1 higher than –50% and C1/(C2+C3) lower than 20, and that oil or heavier hydrocarbon an-aerobic biodegradation occurs along the seepage system of the mud volcano indicated by higher iC4/nC4 and C2/C3 values. The high δ13CCO2 values of two gas samples from two different vents suggest secondary methanogenesis with CO2 reduction after oil biodegradation, while isotopically enriched CO2 is absent in the third vent. The variability of the δ13CCO2 value might mean that the different vents of Dushanzi mud volcano might correspond to different circulation systems and different reservoirs. |
| GAO Yuan,WANG Yong-li,ZHENG Guo-dong,MENG Pei,WU Ying-qin,YANG Hui,ZHANG Hong,WANG You-xiao.2012.Geochemical Characteristics of Natural Gas from Dushanzi Mud Volcano in Junggar Basin, Xinjiang[J].Acta Geoscientica Sinica,33(6):989-994. |
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