Natural gas hydrates (NGH) are considered as a clean energy which widely spread in marine sediments and permafrost regions. Numerical simulation is a convenient and economic way to study methane production from reservoir, a lot of previous simulations treated the hydrate reservoir as homogeneous layers. However, the underground environment is tend to be complexity, there may be a high permeability tub connect reservoir with surrounding rock, and the water of surrounding rock may flow into reservoir along the connection tub. In order to explore the effects of hydraulic connection between reservoir and surrounding rock on gas production, a 3D geological model based on logging data of Shenhu Area of the South China Sea is established. The different strength of connections were realized by constructing varying spatial distributions of permeability and porosity. Results show that in regions of strong hydraulic connection, the hydrate dissociation rate is higher than weak hydraulic connection zones, the relative permeability of gas is higher tan water because the gas saturation is higher relatively So reservoir having strong connection with surrounding rock may not be poured with large amount of water.

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