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《Acta Sedimentologica Sinica》 2008-01
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~(40)Ar/~(36)Ar Characteristics of Natural Gases and Its Geological Significance in the North Margin of Qaidam Basin

ZHANG Rui1,2 ZHANG Xiao-bao1 XIA Yan-qing1 LI Chuan-hao4 XU Zi-yuan5 WANG Li-qun5 MA Li-xie5 SONG Cheng-peng3,2 WU Tao1,2 GUO Jian-ming1(1.Key Laboratory of Gas Geochemistry,Institute of Geology and Geophysics,Chinese Academy of Science,Lanzhou 730000;2.Graduate University of Chinese Academy of Science,Beijing 100049;3.Institute of Geology and Geophysics,Chinese Academy of Science,Beijing 100029;4.The First Oil Production Factory of the Changqing Oil Field,Xi'an 710054;5.Research Institute of Exploration and Development,Qinghai Oilfield Company,PetroChina,Dunhuang Gansu 636202)  
He and Ar isotopic compositions of fourteen natural gas samples from the north margin of Qaidam Basin were analyzed.The relation of gas and source was also correlated using 40Ar/36Ar ratio.It is found that the 40Ar/36Ar values of natural gases in the area distribute in the range from 951 to 1 712,averaging 1098,with most values higher than 40Ar/36Ar values of the Jurassic natural gases from other Chinese basins.The research shows that there were not mantle-derived fluid with high 40Ar/36Ar values in the region,and an aging effect of reservoirs could not result in the phenomena.Therefore,the higher 40Ar/36Ar values are mainly caused by the aging effect of source rocks.By calculation,the age of gas source rocks distributes between 164.7 and 460.8 Ma,averaging 345.1 Ma,showing that the most might be from Carboniferous.This conclusion is in agreement with the fact that there are widely distributed Carboniferous source rocks and crude oils derived from the Carboniferous.The discovery of the Carboniferous gases in the area indicates that Carboniferous is a new exploration target,developing a new exploring area in the north margin of Qaidam Basin.
【Fund】: 国家自然科学基金重点项目(批准号:40472971);; 《中国西部山前地区油气资源勘探的基础理论与关键技术》(KZCX3-SW-147)
【CateGory Index】: P618.13
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