1. Postdoctoral Research Associate, PoroMechanics Institute, Mewbourne School of Petroleum and Geological Engineering, Univ. of Oklahoma, Norman, OK 73019.
2. Larry W. Brummett/ONEOK Chair and Professor, PoroMechanics Institute, Mewbourne School of Petroleum and Geological Engineering, ConocoPhillips School of Geology and Geophysics, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Norman, OK 73019 (corresponding author).