scholarly journals Instrumental Methods for Cage Occupancy Estimation of Gas Hydrate

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 485
Author(s):  
Wenjiu Cai ◽  
Xin Huang ◽  
Hailong Lu

Studies revealed that gas hydrate cages, especially small cages, are incompletely filled with guest gas molecules, primarily associated with pressure and gas composition. The ratio of hydrate cages occupied by guest molecules, defined as cage occupancy, is a critical parameter to estimate the resource amount of a natural gas hydrate reservoir and evaluate the storage capacity of methane or hydrogen hydrate as an energy storage medium and carbon dioxide hydrate as a carbon sequestration matrix. As the result, methods have been developed to investigate the cage occupancy of gas hydrate. In this review, several instrument methods widely applied for gas hydrate analysis are introduced, including Raman, NMR, XRD, neutron diffraction, and the approaches to estimate cage occupancy are summarized.

2012 ◽  
Vol 482-484 ◽  
pp. 1017-1020
Author(s):  
Xin Li ◽  
Li Zhi Xiao ◽  
Tian Lin An

Natural gas hydrate in ocean bottom and permafrost is a great potential energy resource. Compared to fluids hydrocarbons (oil, water and gas) in conventional reservoir evaluation, natural gas hydrate exists in sedimentary formations in solid form, which should be reconsidered in its reservoir evaluation and global reserves assessment. Nuclear magnetic resonance (NMR) technique plays an important role in natural gas hydrate reservoir evaluation. The recent applications of NMR logging in natural gas hydrate reservoir evaluation including formation porosity-permeability estimation, gas hydrate saturation estimation and growth habits prediction in rock pores are introduced. Finally, the potential combination application of downhole NMR 1H relaxation and 13C spectroscopy in natural gas hydrate reservoir evaluation model is also discussed.


2020 ◽  
Vol 115 ◽  
pp. 104282 ◽  
Author(s):  
Jianchao Cai ◽  
Yuxuan Xia ◽  
Cheng Lu ◽  
Hang Bian ◽  
Shuangmei Zou

2019 ◽  
Vol 44 (42) ◽  
pp. 23639-23648 ◽  
Author(s):  
Jiping Ding ◽  
Yuanfang Cheng ◽  
Chuanliang Yan ◽  
Bengjian Song ◽  
Hao Sun ◽  
...  

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