OVERBURDEN PRESSURE AFFECTS FRACTURE APERTURE AND FRACTURE PERMEABILITY IN A FRACTURED RESERVOIR Erwinsyah Putra Vivek Muralidharan David S. Schechter Putra is a TEES research engineering associate IV in petroleum engineering at Texas A&M University (TAMU) in College Station. His research interests are in integrated reservoir study, reservoir charac- terization, naturally fractured reservoirs, waterflooding, numerical modeling/reservoir simulation, well testing and geomechanics. Prior to joining TAMU he worked in the Petroleum Recovery Research Center at the New Mexico Institute of Mining and Technology (NMIMT). He holds MS and PhD degrees in petroleum engineering from New Mexico Institute of Mining and Technology. He serves as a review chairman in the Society of Petroleum Engineers Reservoir Evaluation and Engineering. He is also an assistant professor in the Petroleum Engineering Department at Bandung Institute of Technology (BIT), Indonesia. Muralidharan is pursuing his MS degree in petroleum engineering at Texas A&M University, College Station. Prior to joining TAMU, he worked as an engineer with Bajaj Auto Ltd. He is involved with the U.S. Department of Energy-sponsored pilot project “Investigation of Efficiency Improvements During CO 2 Injection in Hydraulically and Naturally Fractured Reservoirs.” His research areas include experimental analysis of petrophysical parameters using X-ray CT scanners, reservoir simulation and reservoir engineering. He holds a BE degree in mechanical engineering from the Regional Engineering College, Bhopal, India. Schechter is associate professor in petroleum engineering at TAMU. For seven years, he previously headed the Naturally Fractured Reservoir Characterization/Engineering group at the New Mexico Institute of Mining and Technology. Schechter has been involved in an extensive reservoir characterization effort in the naturally fractured Spraberry Trend Area, which involved geological, petrophysical, logging interpretation, coreflooding and simulation studies. He holds a PhD in physical chemistry from Bristol University, England. He also spent five years at the Stanford University Petroleum Engineering Department as a post doctoral research associate and assistant professor.