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Magnetic, Geochemical and Mineralogical Charac teristics of Soils in Qiangtang Basin, Tibet, China: Implications for Prospective Oil and Gas Land

查看全文 作　　者：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 高影响力作者 出　　处：《Journal of China University of Geosciences》索引2001年第12卷第2期,共5页高影响力期刊 基　　金：ThisstudyissupportedbytheNationalNaturalScienceFoundationofChina (Nos .498740 2 6and 493742 1 6)andtheVisitingScholarFoundatio 摘　　要：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 Δ C ), 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 (C 1, E 1 and E 2 anomalies) are related to the distribution of Neogene volcanic rocks on the surface in the Gangmacuo Xiyaergang uplift. Two other anomalies (C 2 and E 4 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. 关 键 词：hydrocarbon microseepage soil magnetism Tibet.
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