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GSA Annual Meeting, November 5-8, 2001

Paper No. 0
Presentation Time: 11:15 AM

THE COMPOSITION AND PHYSIO-CHEMICAL FEATURES OF THE PALEO-FLUID IN DAGANG OIL FIELD OF CHINA


XUECHUN Sr, Xu, Graduate School, Jilin Univ, 10 Qianwei Road, Changchun, 130012, China, FEI, Han, College of Education Science, Northeast Normal Univ, 13 Renmin Street, Changchun, 130024, China, YIUHONG Sr, Sun, Department of Constraction Engenering, Jilin Univ, 6 Ximinzhu Street, Changchun, 130026, China, YUNXUAN, Zhou, Department of Geoexploration and Information Technology, Jilin Univ, 6 Ximinzhu Street, Changchun, 130026, China and ZHIGUO, Ding, Department of Geoscience, Jilin Univ, 6 Ximinzhu Street, Changchun, 130026, China, xuxuechun@yahoo.com

The Dagang oil field is located in the huanghua basin of the north China.It has been undergone five stages of tectonic thermal events.They are Caledonian,Hereyhian,Indo-China,Yanshanian and Himalayan.The result of researching paleo-fluid shows that two stages of paleo-fluid migration are taken place in this area.They are separately in yanshanian and Himalayayan,and is called as early stage and late stage.The features of fluid inclusion,composition and physio-chemical properties are very different between early stage and late stage.The liquid hydrocarbon inclusion is dominent in fluid inclusions of early stage,and the gas-liquid hydrocarbon inclusion is major in fluid inclusions of late stage.The content of organic composition is smaller(13.5-37.9wt%)than inorganic composition(62.0-85.9wt%) in fluid inclusion of early stage.The content of organic composition is higher(34.6-73.0wt%) than inorganic composition(26.6-65.2wt%) in fluid inclusion of late stage.Temperature and pressure is very different in fluid inclusions of early and late stages.The temperature is smaller in early stage(100-120 C) than in late stage(135-150 C).The pressure is higher in late stage(17-46Mpa) than in early stage(16-43Mpa).The pH value and Eh value of paleo-fluid is slightly smaller in early stage than in late stage.The above data indicate that two stage of oil-gas migration is existed in this area.

Session No. 152

General Geochemistry
Thursday, 8 November 2001: 8:00 AM-12:00 PM
Geological Society of America Abstracts with Programs. Vol. 33, No. 6, October 2001, p.2188
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