Cryogenic Raman Spectroscopic Characteristics of NaCl-H2O，CaCl2-H2O and NaCl-CaCl2-H2O: Application to Analysis of Fluid Inclusions
MAO Cui1，CHEN Yong1,2*，ZHOU Yao-qi1，GE Yun-jin1，ZHOU Zhen-zhu1，WANG You-zhi3
1. College of Geo-Resource and Information, China University of Petroleum, Dongying 257061, China 2. State Key Laboratory of Enhanced Oil Recovery, PetroChina Exploration and Development Research Institute, Beijing 100083, China 3. Exploration and Development Research Institute of PetroChina Daqing Oilfield Company, Daqing 163000, China
Abstract：Accurately diagnosing the types of the salt and calculating the salinity quantitatively are the significant content of fluid inclusions. The traditional method of testing fluid inclusions salinity is cooling. To overcome the difficulty for observing freezing phase transition, the authors tested the spectrum of NaCl-H2O, CaCl2-H2O and NaCl-CaCl2-H2O systems at -180 ℃ by laser Raman spectroscopy. The result demonstrates that the ratio of peak values has linear relationship with salinity. Calibration curves were established by typical ratio of hydro-halite at 3 420 cm-1 to the ice at 3 092 cm-1, and the ratio of antarcticite at 3 432 cm-1 to the ice at 3 092 cm-1. The calibration curves have very high correlation coefficient. This method is verified by synthetic hydrocarbon-bearing aqueous fluid inclusions and quartz aqueous fluid inclusions of well Fengshen 6 in Dongying sag. The results of the authors’ experiments show that cryogenic Raman spectroscopy can not only identify the types of the salts but also determine the salinity effectively in fluid inclusions.
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