PetroChina Research Institute of Petroleum Exploration&Development 100083;
Key Laboratory of Oil and Gas Underground Storage Project of China National Petroleum Corporation 065007;
China University of Petroleum 102249;
State Key Laboratory of Heavy Oil Processing 102249;
State Key Laboratory of Enhanced Oil Recovery 100083;
PetroChina Liaohe Oilfield Company 124010;
underground gas storage; phase behavior characteristic; mathematical model; experimental simulation; action mechanism;