Origin,migration and mixing of oilfield brines: Stable iso-topic evidence from Kuqa Foreland Basin  

作　　者：蔡春芳 汪集旸 曾凡刚 何宏 

出　　处：《Science China(Technological Sciences)》2001年第S1期175-180,共6页中国科学（技术科学英文版）

基　　金：The research is financially supported by the National Natural Science Foundation of China (Grant No. 49773198) ; Creative Research Foundation of CNPC for youth and middle-aged persons .

摘　　要：87Sr/86Sr, 8 D and δ180 together with chemistry of oilfield brines, were measured from Cambrian to Neogene strata in the Kuqa Foreland Basin, northwest China. The brines have 87Sr/86Sr ratios ranging from 0.70944 to 0.71716, 8D values from -33‰ to -67‰ and δ18O from -9.0‰ to 3.9‰. The most radiogenic 87Sr brines have relatively heavy δ18O in the Cambro- Ordo-vician carbonates, and are suggested to originate from crystalline basement. 8 D and δ18O sys-tematics show that all the brines slope to Global Meteoric Water Line, and intersect at 8 D = -60‰ and δ18O = -8.8‰, close to that of present-day local meteoric water, suggesting that meteoric water has mixed with evaporated ancient meteoric water. More saline samples have the lowest δD and δ180 contents and molar Na/CI ratios of more than 0.9, resulting from salt dissolution.87Sr/86Sr, 8 D and δ180 together with chemistry of oilfield brines, were measured from Cambrian to Neogene strata in the Kuqa Foreland Basin, northwest China. The brines have 87Sr/86Sr ratios ranging from 0.70944 to 0.71716, 8D values from -33‰ to -67‰ and δ18O from -9.0‰ to 3.9‰. The most radiogenic 87Sr brines have relatively heavy δ18O in the Cambro- Ordo-vician carbonates, and are suggested to originate from crystalline basement. 8 D and δ18O sys-tematics show that all the brines slope to Global Meteoric Water Line, and intersect at 8 D = -60‰ and δ18O = -8.8‰, close to that of present-day local meteoric water, suggesting that meteoric water has mixed with evaporated ancient meteoric water. More saline samples have the lowest δD and δ180 contents and molar Na/CI ratios of more than 0.9, resulting from salt dissolution.

关 键 词：87Sr/86Sr δD and Δ18O ORIGIN MIGRATION BRINES KUQA FORELAND Basin. 

分 类 号：P592[天文地球—地球化学]