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题名: Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China
作者: Duan, Y. ; Wang, C. Y. ; Zheng, C. Y. ; Wu, B. X. ; Zheng, G. D.
刊名: GEOCHEMICAL JOURNAL
出版日期: 2008
卷号: 31, 期号:41370, 页码:341-356
关键词: crude oil ; Xifeng oilfield ; Ordos basin ; biomarker ; carbon isotope ; origin ; oil-source rock correlation ; maturity ; migration ; depositional environment
学科分类: Geosciences, Multidisciplinary
英文摘要: A comprehensive study was performed to characterize, for the first time, the mud, water, and gases released from onshore mud volcanoes located in the southern margin of the Junggar Basin, northwestern China. Chemical compositions of mud, along with the geology of the basin, suggest that a source of the mud is Mesozoic or Cenozoic shale. Oxygen and H isotope compositions of the released water suggest a local meteoric origin. Combined with the positive Eu anomalies of the water, a large (18)O shift of the water suggests extensive interaction with rocks. Gases discharged from the mud volcanoes are predominantly thermogenic hydrocarbons, and the high delta(13)C values (>+20 parts per thousand VPDB) for CO(2) gases and dissolved carbonate in muddy water suggest secondary methanogenesis with CO(2) reduction after oil biodegradation. The enrichments of Eu and (18)O in water and the low thermal gradient of the area suggest that the water-rock interactions possibly occur deeper than 3670 +/- 200 m. On the other hand, considering the relationship to the petroleum reservoir around the mud volcanoes, the depth of the gases can be derived from about 3600 m, a depth that is greater than that generally estimated for reservoirs whose gas is characterized by (13)C-enriched CO(2). Oil biodegradation with CO(2) reduction likely occurs at a shallower depth along the seepage system of the mud volcano. The results contribute to the worldwide data set of gas genesis in mud volcanoes. Moreover, they further support the concept that most terrestrial mud volcanoes release thermogenic gas produced in very deep sediments and may be early indicators of oil biodegradation, an important problem in the petroleum industry. (C) 2011 Elsevier Ltd. All rights reserved.
收录类别: SCI
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.lig.ac.cn/handle/132962/2086
Appears in Collections:油气地球化学研究室_期刊论文

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Duan, Y.; Wang, C. Y.; Zheng, C. Y.; Wu, B. X.; Zheng, G. D..Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China,GEOCHEMICAL JOURNAL,2008,31(41370):341-356
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