1. University of Science and Technology Beijing Beijing 100083 China
2. Research Institute of Petroleum Exploration and Development, CNPC Beijing 100083 China
3. Petro China Liaohe Oilfield Company, Panjin Liaoning 124000 China
4. Petro China Tarim Oilfield Company, Korla Xinjiang 841000 China
5. Petro China Southwest Oil and Gas Field Company Chongqing 401121 China