ACKNOWLEDGMENTS

We would like to thank Zhiguang Xue, and Junzhe Sun for their constructive suggestions. The first author thanks China University of Petroleum-Beijing for supporting his visiting to the Bureau of Economic Geology at UT Austin. The work is partially supported by Youth Science Foundation of China University of Petroleum at Beijing (Grant NO. 01jb0508) and Science Foundation of China University of Petroleum-Beijing (Grant NO.2462015YQ0604).