A new method for analysis of δ18O and δD in oil-and-gas field water and its application
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摘要: 采用元素仪-同位素质谱计联机装置(EA-IRMS)对油气田水中氢氧同位素组成进行在线分析.样品水在高温(1450℃)裂解炉内与玻璃碳粒反应生成H2和CO,经过色谱分离,并被载气带入质谱计.根据二者不同的保留时间,设定磁场转换,依次测定氢氧的同位素组成.该方法一次进样即能完成氢氧同位素的测定,效率高、重复性好.将该方法应用于四川盆地天然气田水样的分析,结果显示三叠系须家河组地层水可能存在古代大气降水和海源沉积水的掺和.Abstract: We described a new and simple on-line pyrolysis method for the analysis of δ18O and δD in oil-and-gas field water by continuous flow EA-IRMS.The sample water was converted into CO and H2 in glassy carbon tube which was filled with glassy carbon granules at high temperature (1 450℃).And then,CO and H2 were separated in GC column prior to transferring into the ion source of the Isotope Ratio MS for sequential determination of hydrogen and oxygen isotopes of the sample by magnet switching.This method performed dual measurements of δ18O and δD from a single sample,and had high efficiency and good productivity.Using this method,we measured some water samples from gas fields in the Sichuan Basin.The results showed that the water of Triassic Xujiahe Formation was the mixture of marine sedimentary and ancient meteoric water.
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Key words:
- hydrogen isotope /
- oil-and-gas field water /
- oxygen isotope /
- Sichuan Basin
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[1] 刘泽银,王志东,何凤茹,等.质谱分析水中δ18O的CO2-H2O 平衡法[J].核农业学报,1987,1(1):43-50. [2] 唐富荣,李月芳,文启彬.氢同位素分析样品制备新方法[J].岩矿测试,2001,20(3):179-182. [3] 孙青,王晓华,石丽明.GasBench Ⅱ-IRMS 水平衡氢氧同位素分析方法研究[J].岩矿测试,2009,28(1):1-4. [4] 王政,刘卫国,文启彬.土壤样品中氮同位素组成的元素分析仪:同位素质谱分析方法[J].质谱学报,2005,26(2):71-76. [5] Thermo Electron Corporation.FinniganTM TC/EA Operating Manual[Z].[S.l.]:Bremen,2004. [6] Stephen T,Nelson A.Simple practical methodology for routine VSMOW/SLAP normalization of water samples analyzed by continuous flow methods[J].Rapid Commun Mass Spectrom,2000,14:1044-1046. [7] 楼章华,金爱民,付孝悦.海相地层水文地球化学与油气保存条件评价[J].浙江大学学报,2006,40(3):501-505. [8] 钱一雄,蔡立国,顾忆.塔里木盆地塔河油区油田水元素组成与形成[J].石油实验地质,2003,25(6):751-756. [9] 李贤庆,侯读杰,胡国艺.鄂尔多斯盆地中部奥陶系地层水有机组分特征[J].石油与天然气地质,2002,23(1):26-29. [10] 林耀庭,熊淑君.氢氧同位素在四川气田地层水中的分布特征及其成因分类[J].海相油气地质,1999,4(4):39-45. -
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