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A New Method for Determining Fluid Compositions in the H20-NaCl-CaCl2 System with Cryogenic Raman Spectroscopy
Chi Guoxiang1; Chu Haixia1; Ryan Scott1; Chou Iming2
2014
Source PublicationActa Geologica Sinica
Volume88Issue:4Pages:1169-1182
AbstractRaman peaks of various hydrates in the H_2O-NaCl-CaCl_2 system have been previously identified, but a quantitative relationship between the Raman peaks and X_(NacI) (i-e., NaCl/ (NaCl+CaCl_2)) has not been established, mainly due to the difficulty to freeze the solutions. This problem was solved by adding alumina powder to the solutions to facilitate nucleation of crystals. Cryogenic (-185℃) Raman spectroscopic studies of alumina-spiced solutions indicate that X_(NaCi) is linearly correlated with the total peak area fraction of hydrohalite. Capsules of solutions made from silica capillary were prepared to simulate fluid inclusions. Most of these artificial fluid inclusions could not be totally frozen even at temperatures as low as -185℃, and the total peak area fraction of hydrohalite is not correlated linearly with X_(NaCl)· However, the degree of deviation (△Х_(NaCl)) from the linear correlation established earlier is related to the amount of residual solution, which is reflected by the ratio (r) of the baseline "bump" area, resulting from the interstitial unfrozen brine near 3435 cm-1, and the total hydrate peak area between 3350 and 3600 cm-1. A linear correlation between AX_(NaCl) and r is established to estimate X_(NaCl) from cryogenic Raman spectroscopic analysis for fluid inclusions.
KeywordCryogenic Raman H2o-nacl-cacl2 Xnaci Fluid Inclusion
Subject Area生物工程学(生物技术)
Language中文
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/5254
Collection深海科学研究部_深海极端环境模拟研究实验室
Affiliation1.Department of Geology, University of Regina, Regina, Canada, Saskatchewan, S4S 0A2
2.Laboratory for Experimental Study Under Deep-sea Extreme Conditions, Sanya Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Hainan, Sanya, 572000
Recommended Citation
GB/T 7714
Chi Guoxiang,Chu Haixia,Ryan Scott,et al. A New Method for Determining Fluid Compositions in the H20-NaCl-CaCl2 System with Cryogenic Raman Spectroscopy[J]. Acta Geologica Sinica,2014,88(4):1169-1182.
APA Chi Guoxiang,Chu Haixia,Ryan Scott,&Chou Iming.(2014).A New Method for Determining Fluid Compositions in the H20-NaCl-CaCl2 System with Cryogenic Raman Spectroscopy.Acta Geologica Sinica,88(4),1169-1182.
MLA Chi Guoxiang,et al."A New Method for Determining Fluid Compositions in the H20-NaCl-CaCl2 System with Cryogenic Raman Spectroscopy".Acta Geologica Sinica 88.4(2014):1169-1182.
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