Experiment of the ~(40)Ar/~(39)Ar dating of diagenetic illite in gas reservoirs |
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| Institution: | WANG Longzhang, DAI Tongmo & PENG Ping'an State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China; Faculty of Resources, Chinese University of Geosciences, Wuhan 430074, China |
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| Abstract: | 40Ar/39Ar dating of diagenetic illite has been performed to investigate gas reservoirs in the Sulige Gas Field of the northern Ordos Basin. A series of technical challenges were confronted, including illite purification, Ar recoil loss, and separation of diagenetic illite from detrital illite. Mineral growth ages for diagenetic illite were obtained by this experiment, from which the age of gas emplacement was deduced to be later than 169 Ma. |
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| Keywords: | 40Ar/39Ar dating diagenetic illite purification of clay minerals Ar recoil loss time of gas emplacement |
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