4Q2011 – 1Q2012 Semi-Annual Progress Report Thirty-Seventh and Thirty-Eighth Quarterly Reports: October 2011 – March 2012 Resource Characterization and Quantification of Natural Gas Hydrate and Associated Free-Gas Accumulations in the Prudhoe Bay – Kuparu

Oil and Natural Gas Technology Cooperative Research Agreement Award Number DE-FC-01NT41332 4Q2011 – 1Q2012 Semi-Annual Progress Report Thirty-Seventh and Thirty-Eighth Quarterly Reports: October 2011 – March 2012 Resource Characterization and Quantification of Natural Gas Hydrate and Associated Free-Gas Accumulations in the Prudhoe Bay – Kuparuk River Area on the North Slope of Alaska Submitted by: BP Exploration (Alaska), Inc. Robert Hunter (Weston Solutions) with Stephen Lewis (Principal Investigator) P.O. Box 196612 Anchorage, Alaska 99519-6612 Prepared for: United States Department of Energy National Energy Technology Laboratory May 30, 2012