1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2. Chengdu North Petroleum Exploration and Development Technology Company Limited, Chengdu, Sichuan 610500, China
3. Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, University Station, Box X, Austin, Texas 78713, United States
4. PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, China
5. Sichuan Changning Natural Gas Development Co., Ltd., Chengdu, Sichuan 610051, China