1. State Key Laboratory of Oil and Gas Reservoir, Geology and Exploitation; Chengdu University of Technology Chengdu 610059 Sichuan China
2. Research Institute of Petroleum Exploration and Development; PetroChina Bejing 100083 China
3. Exploration and Development Research Institute of Jianghan Oilfield Branch of Sinopec; Qianjiang 433124, Wuhan China