Natural gas hydrate are rich

which is one of the most potential new energy resources with abundant resources. However

gas hydrate has not been exploited commercially at present

and its micro-structure characteristics and gas storage mechanism need to be clarified urgently. Based on the framework and guest molecular information of SI

SII and SH type gas hydrates

the molecular models of three typical gas hydrates are constructed and optimized. The hydrogen bonds number

hydrogen bonds length

porosity

pore composition

pore size distribution and other structural characteristics of hydrates are determined by structural characterization

and the micro-structure differences of three typical hydrates are compared and analyzed. Based on the hydrate skeleton structure

the adsorption behavior of methane and carbon dioxide is studied by the grand Canonical Monte Carlo method. Combined with the adsorption capacity and adsorption heat

the gas storage characteristics and differences of the three hydrates are clarified. The results show that the hydrogen bonds in SII hydrate are the longest and the most abundant

but the pore connectivity is the worst. High pressure is conducive to increasing the gas storage capacity of hydrate

while low temperature can increase the stability of gas adsorption in hydrate. Although the amount of carbon dioxide storage is smaller than that of methane

the adsorption stability of carbon dioxide is stronger. The adsorption capacity of gas in SII type hydrate is the largest

and the adsorption heat in SI type hydrate is the largest.