PNNL-26016 Prepared for the U.S. Department of Energy under Contract DE-AC05-76RL01830 Benchmark Problems of the Geothermal Technologies Office Code Comparison Study M.D. White R.K. Podgorney S. Kelkar M.W. McClure G. Danko A. Ghassemi P. Fu D. Bahrami C. Barbier Q. Cheng K. Chiu C. Detournay D. Elsworth Y. Fang J.K. Furtney Q. Gan Q. Gao B. Guo Y. Hao R.N. Horne K. Huang K.J. Im J. Norbeck J. Rutqvist R. Safari V. Sesetty E. Sonnenthal Q. Tao S.K. White Z. Wong Y. Xia November 2016