The project was supported by the National Key Basic Research Program of China 9732012CB215002;National Natural Science Foundation of China21276278,21176255;China National Petroleum Corporation CNPC Program 2011A-2101@@@@国家重点基础研究发展规划项目9732012CB215002;国家自然科学基金21276278,21176255;中国石油股份公司2011A-2101