1 Sichuan Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,China

2 Division of Key Laboratory of Carbonate Reservoirs,China National Petroleum Corporation, Southwest Petroleum University,Chengdu 610500,China

3 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University,Chengdu 610500,China

4 Geological Exploration and Development Research Institute,CNPC Chuanqing Drilling Engineering Company Limited,Chengdu 610051,China

5 Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi’an 710018,China

6 Gasfield Development Department,PetroChina Changqing Oilfield,Xi’an 710018,China