Characteristics of gas geochemistry in Yangbajing geothermal field, Tibet

查看全文 作　　者：Ping Zhao;Ji Dor;Tingli Liang;Jian Jin;Haizheng Zhang

机构地区：[1]Chinese Acad Sci, Inst Geol, Beijing 100029, Peoples R China;[2]Tibet Bur Geol & Mineral Resources, Geothermal Geol Team, Lhasa 851400, Peoples R China;

出　　处：《Chinese Science Bulletin》索引1998年第43卷第21期,共8页

基　　金：ThisworkwassupportedbytheNationalNaturalScienceFoundationofChina (GrantNos.4940 2 0 39and 496 72 16 8)andInternationalAtomicEnergyAgency (GrantNo .90 95 ) 摘　　要：CO 2 is a main component of gases in the Yangbajing geothermal field, usually higher than 85 in volume; others are N 2, H 2S, H 2, CH 4, etc. Helium R/R a ratios, ranging from 0.14 to 0.46, indicate a crustal component to be dominant in the gases. δ 13C-CO 2 values and δ 34S-H 2S values are in the range -7.72‰--11.33‰ and 0.2‰-8.3‰, respectively. The gases are inferred to mostly derive from the partial melting of the Nyainqentanglha core complex. The gases of shallow and deep reservoirs are distinctive in chemical compositions and δ 34S-H 2S values, which shows their different flowing paths and physical-chemical processes. Sulphur does not approach isotopic equilibrium between H 2S and SO 2- 4 species in both reservoirs. Significance of steam chemical monitoring is also discussed. 关键词：GAS GEOCHEMISTRY ISOTOPE RESERVOIR Yangbajing Tibet.

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Characteristics of gas geochemistry in Yangbajing geothermal field, Tibet

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