Characterization of Inclusions in Evolution of Sodium Sulfate Using Terahertz Time-domain Spectroscopy

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  • BAO Rima
    Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum
  • WU Zhikui
    Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum
  • LI Hao
    Petroleum Exploration & Production Research Institute, China Petroleum & Chemical Corporation (SINOPEC)
  • WANG Fang
    Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum
  • MIAO Xinyang
    Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum
  • FENG Chengjing
    Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum

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Abstract

The study of fluid inclusion is one of the important means to understanding the evolution of mineral crystals, and can therefore provide original information of mineral evolution. In the process of evolution, outside factors such as temperature and pressure, directly affect the number and size of inclusions, and thus are related to the properties of crystals. In this paper, terahertz time-domain spectroscopy (THz-TDS) was used to detect sodium sulfate crystals with different growth temperatures, and absorption coefficient spectra of the samples were obtained. It is suggested that the evolution of sodium sulfate could be divided into two stages, and 80°C was the turning point. X-ray diffraction (XRD) and polarizing microscopy were used to support this conclusion. The research showed that THz-TDS could characterize the evolution of mineral crystals, and it had a unique advantage in terms of crystal evolution.

Journal

  • Analytical Sciences

    Analytical Sciences 33 (9), 1077-1080, 2017

    The Japan Society for Analytical Chemistry

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