1. Postdoctoral Fellow, Dept. of Geosciences and Geological and Petroleum Engineering, Missouri Univ. of Science and Technology, 129 McNutt Hall, Rolla, MO 65409 (corresponding author).
2. Professor, Dept. of Geosciences and Geological and Petroleum Engineering, Missouri Univ. of Science and Technology, 129 McNutt Hall, Rolla, MO 65409.