1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation; Southwest Petroleum University; Xindu, Chengdu Sichuan 610500 People's Republic of China
2. Sinopec Southwest Oil and Gas Company; 108 Tidu Street Chengdu Sichuan, People's Republic of China
3. Department of Geological Sciences and Engineering; Missouri University of Science and Technology; Rolla Missouri 65409