Experimental research on NMR response characte-ristics of hydrates
TANG Kexuan1,2, LI Zhenyu2, WANG Hongyu3, ZHANG Wenbo2, PAN Jianwei4
1. China Water Resources Beifang Investigation, Design and Research Co., Ltd. (BIDR), Tianjin 300222, China; 2. Institute of Geophysics & Geomatics, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China; 3. Hubei Earthquake Agency, Wuhan, Hubei 430071, China; 4. College of Resources and Environmental Engineering, Guizhou University, Guiyang, Guizhou 550025, China
Abstract:Studying the nuclear magnetic resonance (NMR) response characteristics of gas hydrate in frozen soil region is of great significance for the classification of permafrost structure and the identification of hydrate reservoir. This study explores the NMR signal variation characteristics of the test samples during the formation and decomposition of tetrabutylammonium bromide (TBAB) hydrate. There are three obvious peaks (main peak, secon-dary peak and attached peak) in the transverse relaxation (T2) time spectrum during freeze-thaw of the hydrate, which are attributed to the H nuclei of free water, bound water and water-soluble organic matter, respectively. Utilizing the distribution, amplitudes, areas and their variation of peaks, we can study the physicochemical state change of hydrate samples. In particular, the significance of the se-condary peak and the attached peak can be employed to directly judge whether the hydrate exists and clarify its content. The decomposition of TBAB hydrate is divided into three stages:dispersion stage, decomposition stage and stable stage. Also, the relations of NMR signals with temperature and time are derived, which are applicable as the basis for the quantitative analysis of the content and storage conditions of the hydrate.
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