Heterogeneous Effect of Organic Matter on Accumulation Behaviors of Shale Gas in Water

Hydraulic fracturing technology is widely used in unconventional oil and gas exploitation. The existence of water makes the interactions between oil and gas and the interface more complex. Therefore, it is important to understand the interaction between gas and solid in a water environment. In the paper, we construct a generalized charged plate to study the accumulation and diffusion of shale gas on the solid interface in a water environment. The atomic arrangement of the charged interface has an essential influence on the state of the gas accumulation. With the increase of the interfacial bond length, the accumulation ability of the gas is reduced. The accumulation of the gas and water on the interface shows a mutually competitive relationship. The law of change is attributed to the interaction between water molecules and the interface. The longer bond length of the interface makes the water molecules near the interface more orderly, and it is difficult for gas molecules to stay at the interface.