| Magnetic, Geochemical and Mineralogical Charac teristics of Soils in Qiangtang Basin, Tibet, China: Implications for Prospective Oil and Gas Land |
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| 作者姓名： | Liu Qingsheng |
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| 作者单位： | Liu Qingsheng Department of Geophysics，China University of Geosciences，Wuhan 430074; The State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation of China，Institute of Chengdu Technology，Chengdu 610059 Wu Qifan Li Haixia Department o |
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| 基金项目： | ThisstudyissupportedbytheNationalNaturalScienceFoundationofChina (Nos .498740 2 6and 493742 1 6)andtheVisitingScholarFoundatio |
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| 摘 要： | ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐｒｅｓｅｎｃｅｏｆｍａｇｎｅｔｉｃａｎｏｍａｌｉｅｓｏｖｅｒｏｉｌａｎｄｇａｓｆｉｅｌｄｓｈａｓｂｅｅｎｋｎｏｗｎｆｏｒｓｅｖｅｒａｌｄｅｃａｄｅｓ,ｂｕｔｉｔｉｓｏｎｌｙｉｎｒｅｃｅｎｔｙｅａｒｓｔｈａｔｔｈｅｐｈｅｎｏｍｅｎｏｎｈａｓｂｅｅｎｃｒｉｔｉｃａｌｌｙｉｎｖｅｓｔｉｇａｔｅｄ .Ｔｈｅｍａｇ ｎｅｔｉｃｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｓｏｉｌａｎｄｓｅｄｉｍｅｎｔａｒｅｃｌｏｓｅｌｙｒｅｌａｔｅｄｔｏｓｏｍｅｇｅｏｃｈｅｍｉｃａｌｐｒｏｃｅｓｓｅｓ,ｓ…
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Magnetic, Geochemical and Mineralogical Charac-teristics of Soils in Qiangtang Basin, Tibet, China:Implications for Prospective Oil and Gas Land |
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| Liu Qingsheng.Magnetic, Geochemical and Mineralogical Charac teristics of Soils in Qiangtang Basin, Tibet, China: Implications for Prospective Oil and Gas Land[J].Journal of China University of Geosciences,2001,12(2). |
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| Authors: | Liu Qingsheng Wu Qifan Li Haixia heng Tongjin Xia Xianghua Chan Lung S Zhang Shuang |
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| Abstract: | The alteration of iron-bearing minerals induced by hydrocarbon microseepage above oil/gas reservoirs has been evaluated using measurements of soil magnetic susceptibility κ, geochemical compositions (gas hydrocarbon and alteration carbonate ΔC), and composition and concentration of iron-bearing minerals. The analyses were performed along two profiles across the Qiangtang basin in Tibet, China: the Nuoermahu-Xuehuanhu profile (C) and the Mugari-Huochetoushan profile (E). Results show that three strong magnetic anomalies (C1, E1 and E2 anomalies) are related to the distribution of Neogene volcanic rocks on the surface in the Gangmacuo-Xiyaergang uplift. Two other anomalies (C2 and E4 anomalies), characterized by both moderately amplitude magnetic susceptibility and elevated soil gas hydrocarbons, occur near fault zones in the Cuoni-Donghu synclinorium. These latter anomalies display characteristics of hydrocarbon microseepage anomalies commonly associated with oil and gas accumulations. Their presence in the Cuoni-Donghu synclinorium suggests that parts of the Qiangtang basin may have significant petroleum potential. |
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| Keywords: | hydrocarbon microseepage soil magnetism Tibet |
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