Richard Krahenbuhl

Research Assistant Professor, Geophysics

Education

  • PhD, Geophysics, Colorado School of Mines
  • BS, Geophysics, University of California, Santa Barbara

Research Areas

  • Collecting, processing and inversion of non-seismic data for energy exploration
  • Archaeological investigations
  • UXO identification
  • Volcanic studies
  • Reservoir monitoring
  • Hydrogeologic problems

Publications

  • Krahenbuhl, R., C. Martinez, Y. Li, and G. Flanagan, 2015: Time-lapse monitoring of CO2 sequestration: an integrated site investigation based on reservoir properties and seismic with borehole and surface gravity data. Geophysics, in press (Special Section, Advances in Time-Lapse)
  • Reitz, A., R. Krahenbuhl, and Y. Li, 2015: Feasibility of time-lapse gravity and gravity gradiometry monitoring for SAGD reservoirs. Geophysics, in press (Special Section, Advances in Time-Lapse)
  • Foks, N., R. Krahenbuhl, and Y. Li, 2014: Adaptive sampling of potential-field data: A direct approach to compressive inversion. Geophysics, 79, IM1-IM9.
  • Krahenbuhl, R., A. Reitz, H. Rim, and Y. Li, 2014: Improved recovery of fluid movement through time-lapse borehole vector gravity. 84th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • Reitz, A., R.A. Krahenbuhl, Y. Li, and J. Brady, 2014: Feasibility of surface and borehole time-lapse gravity for SAGD monitoring. 84th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • Dodds, K., R. Krahenbuhl, A. Reitz, Y. Li, and S. Hovorka, 2013: Evaluating time-lapse borehole gravity for CO2 plume detection at SECARB Cranfield. International Journal of Greenhouse Gas Control (IJGGC), Special Issue: ‘The large-scale CO2 Injection Test at Cranfield, Mississippi, USA”. Vol 18, 421-429
  • Martinez, C., Y. Li, R. Krahenbuhl, and M. Braga, 2013: 3D inversion of airborne gravity gradiometry for iron ore exploration in Brazil. Geophysics, 78, B1-B11
  • Li, Y., S. Devriese, R. Krahenbuhl, and K. Davis, 2013: Enhancement of magnetic data by stable downward continuation for UXO application. IEEE Trans. Geo. Sci & Remote Sens, 51, 3605-3614
  • Krahenbuhl, R. A., C. Martinez, Y. Li, and G. Flanagan , 2013: Integrating reservoir properties and seismic with borehole and surface time-lapse gravity data for monitoring CO2 sequestration: A site investigation. 83nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • Reitz, A., R.A. Krahenbuhl, and Y. Li, 2013: Feasibility of time-lapse gravity gradiometry for SAGD monitoring. 83rd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • Hovorka, S., R.A. Krahenbuhl, A. Reitz, Y. Li, and K. Dodds, 2012: Evaluating time-lapse borehole gravity for CO2 plume detection at SECARB Cranfield. Intern. Conf. on Greenhouse Gas Technologies (ICGGT), Kyoto, Nov. 2012
  • Krahenbuhl, R. A., Y. Li, and T. Davis, 2012: Time-lapse gravity for reservoir monitoring: Feasibility and potential applications. 22nd Internat. Geophys. Conf. and Exhib., Australian Soc. Expl. Geophys (ASEG), Expanded Abstracts
  • Martinez, C., Y. Li, R.A. Krahenbuhl, and M.A. Braga, 2012: Structurally constrained lithology characterization using magnetic and gravity gradient data over an iron ore formation. 22nd Internat. Geophys. Conf. and Exhib., Australian Soc. Expl. Geophys (ASEG), Expanded Abstracts
  • Krahenbuhl, R.A., Y. Li, and C. Nind, 2012: The benefit of borehole gravity in horizontal monitoring wells for time-lapse applications. 82nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • Reitz, A., R.A. Krahenbuhl, Y. Li, and D DiFrancesco, 2012: Feasibility analysis of time-lapse gravity gradiometry for reservoir monitoring. 82nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • Foks, L., R.A. Krahenbuhl, and Y. Li, 2012: Adaptive sampling of potential-field data: A direct approach to compressive inversion. 82nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts.
  • Martinez, C, Y. Li, R. Krahenbuhl, and M.A. Braga, 2013: 3D inversion of airborne gravity gradiometry data in mineral exploration: A case study in the Quadrilátero Ferrífero, Brazil. GEOPHYSICS, v78, #1, B1 – B11.
  • Krahenbuhl, R., and Y. Li, 2012: Time-lapse gravity: A numerical demonstration using robust inversion and joint interpretation of 4D surface and borehole data. GEOPHYSICS, v77, #2, G33 – G43.
  • Senseney, C., R. Krahenbuhl, and M. Mooney, 2012: Genetic algorithm to optimize layer parameters in light weight deflectometer backcalculation. Int. J. Geomechanics, ASCE, 2012, doi: 10.1061/(ASCE) GM.1943-5622.0000222.
  • Krahenbuhl, R., Y. Li, and T. Davis, 2011 The Leading Edge, Special Issue (Time-Lapse measurements). Understanding the applications and limitations of time-lapse gravity for reservoir monitoring. The Leading Edge, 30, Issue 9, 1060 – 1068.
  • Krahenbuhl, R., and Li, Y., 2011, 4D gravity modeling: Integrating seismic data with highly constrained gravity inversions for effective reservoir monitoring. 12th International Congress of the Brazilian Geophysical Society (sBGF), Expanded Abstract
  • Martinez, C., Y. Li, R. Krahenbuhl, and M. Braga, 2011, Lithologic characterization using magnetic and gravity gradient data over an iron ore formation in the Quadrilatero Ferrifero, Minas Gerais, Brazil. 12th International Congress of the Brazilian Geophysical Society (sBGF), Expanded Abstract
  • Martinez, C., Y. Li, R. Krahenbuhl, and M. Braga, 2011, Lithologic characterization using magnetic and gravity gradient data over an iron ore formation. 12th International Congress of the Brazilian Geophysical Society (sBGF), Expanded Abstract accepted. 81st Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstract
  • Krahenbuhl, R., and Y. Li, 2011, Regularization, model weighting and solution appraisal in binary inversion for time-lapse gravity monitoring. GEM Beijing 2011: International Workshop on Gravity, Electrical & Magnetic Methods and their Applications. Expanded Abstract
  • Li, Y., and R. Krahenbuhl, 2011, A general framework for 3D interpretation of magnetic data affected by remanence and self-demagnetization. 12th International Congress of the Brazilian Geophysical Society (sBGF), Expanded Abstract
  • Krahenbuhl, R, Y. Li, and T. Davis, 2010, 4D gravity monitoring of fluid movement at Delhi Field, LA: A feasibility study with seismic and well data. 80th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • Krahenbuhl, R, Y. Li, and T. Davis, 2010, 4D gravity monitoring of fluid movement at Delhi Field, LA: A feasibility study with seismic and well data. 80th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • CGEMaestro (Co-developer): Software package developed for education at CSM and for the sponsors of the Gravity & Magnetics Research Consortium (GMRC)
  • Mitchell, M.A., S.G.R Devriese, R.N. Frary, R. Krahenbuhl, and B.K. Todd, 2010, Archaeological investigations using geophysics at Chimney Rock Great House, Colorado. 80th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts (results from CSM undergraduate Senior Design project)
  • Martinez, C., Y. Li, R. Krahenbuhl, and M. Braga, 2010, 3D inversion of airborne gravity gradiometry for iron ore exploration in Brazil. 80th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • Krahenbuhl, R., and Li, Y., 2009, Hybrid optimization for lithologic inversion and time-lapse monitoring using a binary formulation, Geophysics, 74, #6, I55-I65
    Accelerated Article
  • Blum, T., K. van Wijk, L. Liberty, M. Batzle, R. Krahenbuhl, A. Revil, and R. Reynolds, 2009, Characterization of a geothermal system in the Upper Arkansas Valley, CO., 79th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • Martinez, C., A. Dean, E. Goggin, R. Krahenbuhl, and B. Todd, 2009, Archaeological investigation of the Court Kiva in Chaco Canyon using geophysical methods. 79th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts (results from CSM undergraduate Senior Design project)
  • Krahenbuhl, R., Y. Li and M. Nabighian, Improving UXO detection in magnetic environments through linear feature analysis. UXO/Countermine Forum 2009, Expanded Abstracts
  • Davis, K., Y. Li, R. Krahenbuhl, and M. Nabighian, 2009, Automatic detection of magnetic UXO anomalies in noisy environments. UXO/Countermine/Range Forum 2009, Expanded Abstracts
  • Davis, K., Kass, M.A., Krahenbuhl, R., and Li, Y., 2008, Survey design and model appraisal based on resolution analysis for 4D gravity monitoring. 78th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts, 27, 731
  • Krahenbuhl, R, and Li, Y., 2008, Joint inversion of surface and borehole 4D gravity data for continuous characterization of fluid contact movement. 78th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • BININV3D (Thesis research software), Software library used to recover a 3D distribution of density contrast from 3D and 4D gravity data using a binary formulation
  • Krahenbuhl, R., and Li, Y., 2007, Influence of self-demagnetization effect on data interpretation in strongly magnetic environments,19th International Geophysical Conference and Exhibition, Perth, WA, Extended Abstracts
  • Krahenbuhl, R., and Li, Y., 2007, Influence of self-demagnetization effect on data interpretation in strongly magnetic environments, 76th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts
  • Krahenbuhl, R., and Li, Y., 2007, Separation of geologic noise in UXO magnetic data using wavelet transform, UXO/Countermine Forum 2007, Expanded Abstracts
  • Krahenbuhl, R., and Li, Y., 2006, Inversion of gravity data using a binary formulation, Geophysical Journal International, Vol. 167, Issue 2, pgs 543-556.
  • Krahenbuhl, R., 2005, Binary inversion of gravity data for salt imaging, Ph.D. thesis, Colorado School of Mines (pdf – 5.8Mb)
  • Krahenbuhl, R., and Li, Y., 2004, Hybrid optimization for a binary inverse problem
    74nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
    Ranked in the top 25 papers presented at the conference & Best Student paper
  • Krahenbuhl, R., and Hitzman, M., 2004, Geophysical modeling of two willemite deposits, Vazante (Brazil) and Beltana (Australia)
    74nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts.
  • Krahenbuhl, R., and Li, Y., 2002, Gravity inversion using a binary formulation
    72nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts.

Recent Courses

  • GPGN 303 – Introduction to gravity, magnetic & electrical methods
  • GPGN 438 – Senior Design
  • GPGN 486 – Geophysics Summer Field
  • GPGN 498/598 – Geophysical Methods for UXO detection & discrimination
  • GPGN 605 – Inversion Theory (regular guest lecturer)

Awards and Recognitions

  • 2012: Historic Preservation Award, Park County, CO. Kake George Cemetery, Senior Design Advisor
  • 2010: SEG IQ Best Earth Paper Award, Finalist: 4D gravity monitoring of fluid movement at Delhi Field, LA: A feasibility study with seismic and well data. A feasibility study with seismic and well data
  • 2007: Project of the Year. Co-performer – SERDP Project MM-1414: Improving detection and discrimination of UXO in magnetic environments
  • 2004: Best Student Paper presented at the 74nd Ann.Internat. Mtg, Soc. Expl. Geophys.
    Krahenbuhl, R., and Li, Y., 2004, Hybrid optimization for a binary inverse problem
  • 2004: Ranked in top 25 papers presented at the 74nd Ann.Internat. Mtg, Soc. Expl. Geophys.
    Krahenbuhl, R., and Li, Y., 2004, Hybrid optimization for a binary inverse problem
  • 2002: SEG Annual Meeting Grant Award, for attendance and presentation research
  • 2002 – 2004 Academic Years: SEG Chevron Scholarship $2000/yr
  • 2001 – 2002 Academic Year: SEG Lucien LaCoste Scholarship $10,000/yr
  • 2000 – 2001 Academic Year: Colorado Graduate Fellowship, $14,000