Liang Xue
National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum, Beijing 102249, P.R. China; College of Petroleum Engineering, China University of Petroleum, Beijing 102249, P. R. China;
China

Daolun Li
School of Mathematics, Hefei University of Technology, Hefei 230009, P. R. China;
China

Hongen Dou
Research Institute of Petroleum Exploration and Development, Beijing 100083, P. R. China;
China