Richard Krahenbuhl




Contact Information:

Dr. Richard A. Krahenbuhl
Research Assistant Professor

Department of Geophysics
Colorado School of Mines
Golden, Colorado 80401, USA

Phone: (303) 384-2329
Fax : (303) 273-3478





Education:

  • 2005, Ph.D., Geophysics, Colorado School of Mines
    Thesis title: Binary inversion of gravity data
  • 1997, B.S., Geophysics, University of California, Santa Barbara

Employment:
  • April 2008 – present: Research Assistant Professor, Department of Geophysics, CSM,
    Center for Gravity, Electrical & Magnetic Studies (CGEM)
  • Summer 2005 – April 2008: Postdoctoral fellow, Department of Geophysics, CSM,
    Center for Gravity, Electrical & Magnetic Studies (CGEM)
  • Fall 2000 – Spring 2005: Research Assistant, Gravity & Magnetics Research Consortium, CSM
  • Sept 1997 – Mar 1998: Geophysics Intern, USGS Hawaiian Volcano Observatory, Geophysics Dept.
  • June 1992 – June 1995: Astronomy Intern, Santa Barbara Museum of Natural History, Astronomy Dept.

Sample Research Projects:
  • Developing feasibility-study protocols to monitoring of CO2 sequestration and EOR projects by 4D gravity method with incorporation of seismic and well data
  • Development and application of global and hybrid optimization techniques for geophysical inversion
  • Regularization, weighting parameters & model appraisal for 3D inversion of geophysical data
  • Structure and formation mechanism of lunar multi-ring basins
  • Tunnel detection
  • Advancing 3D and 4D model development for robust geophysical experiments
  • Influence of self-demagnetization effect on data interpretation in strongly magnetic environments
  • Separation of geologic noise in UXO magnetic data using wavelet transform
  • Gravity, magnetic and DC/IP modeling of willemite deposits in Brazil and Australia
  • Developing non-traditional survey design parameters for improved inversion of DC/IP data
  • Archaeological geophysics at Ludlow massacre site, Colorado
  • Archaeological geophysics at Chaco Canyon National Park, New Mexico
  • Archaeological investigations using geophysics at Chimney Rock Great House, Colorado
  • UXO shape identification through recovery of multipole moments
  • Detection of UXO in strongly magnetic environments by extended Euler deconvolution
  • Enhancement of magnetic data by stable downward continuation for UXO application
  • Improving detection and discrimination of UXO on land in difficult magnetic environments
  • Improving magnetic data interpretation for UXO detection and discrimination in underwater environments
  • Binary inversion of gravity data
  • Hybrid optimization for lithologic inversion and time-lapse monitoring using a binary formulation (awarded SEG Best Student presentation)
  • Joint inversion of surface & borehole 4D gravity data for continuous characterization of fluid contact movement
  • 3D inversion of magnetic data with self-demagnetization

Courses taught:
  • 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)

Grant Proposals:
  • 2014: PI, Northern Solution: Borehole gravity modeling at Prudhoe Bay
  • 2014: PI, Northern Solutions: Modeling and analysis of borehole gravity data for reservoir monitoring at Prudhoe Bay, AK
  • 2013-2014: PI, Anadarko: Imaging base of salt with gravity data: application of binary inversion to the SEAM model
  • 2012-2013: PI, BP Exploration (Alaska): Modeling, simulation and inversion of multiple geophysical data for MBE detection
  • 2011 - 2013: Co-Investigator, NASA Lunar Advanced Science & Exploration Research (LASER): The crustal structure and formation mechanism of lunar multi-ring basins
  • 2008-2011: Principal Investigator, SERDP Project MM-1638: Advanced UXO detection and discrimination using magnetic data based on extended Euler deconvolution and shape identification through multipole moments
  • 2011: PI, BP Alternative Energy: Inversion of borehole time-lapse gravity and simulation for optimal survey design
  • 2010: Co-PI, ConocoPhillips Project: Feasibility study on using time-lapse gravity to monitor CO2 Sequestration
  • 2008-2009: Co-PI, SERDP Project MM-1640: Enhancement of Transient Electro-Magnetic (TEM) data and noise characterization by principal component analysis (PCA)
  • 2008-2009: Co-PI, SERDP Project MM-1642: Enhancement of magnetic data by stable downward continuation for UXO application

Educational Proposals / Contributions:
  • Successful Technology Fund Proposals: Acquired field equipment for teaching
    - Pulse EKKO GPR System by Sensors & Software, Inc., Spring 2011
    - MRS-MIDI surface-NMR System by Radic-Research, Spring 2009

    - EM-34 Ground Conductivity Meter by Geonics, Ltd., Fall 2008
    - Differential GPS System by Trimble (co-author), Spring 2007
    - Geode 24-Chanel In-Field Seismograph by Geometrics, Inc., Fall 2006
    - EM-63 Full Transient ElectroMagnetic Sounder, Geonics, Ltd., Spring 2006
    - SuperSting 28 Channel Resistivity/IP Meter by AGI, Inc., Fall 2005
    - GSMP-40 Potassium Magnetic Gradiometer by GEM System, Spring 2004


University Committees:

  • Department of Geophysics, Colorado School of Mines
    - Undergraduate Advisory Committee (UAC), 2010 - present
    - Undergraduate Curriculum Review panel, Summer - Fall 2010
    - Graduate Advisory Committee (GAC), 2002 - 2003
  • Technology Fee Committee, CSM
  • Research Council


Honors & Awards:

  • 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

 

Collaborators:

  • Reservoir Characterization Project, Colorado School of Mines
    - Integration of RCP seismic and engineering models for robust 4D potential field modeling
  • Planetary Geophysics Lab, Colorado School of Mines
    - The crustal structure and formation mechanism of lunar multi-ring basins

  • International Reservoir Technologies, Inc
    - Cooperative development of advanced 3D & 4D reservoir simulation models for non-seismic methods
  • ConocoPhillips
    - Monitoring CO2 sequestration with time-lapse surface and borehole gravity
  • BP Alaska
    - Reservoir model development of North Slope; non-seismic monitoring studies
  • BP Alternative Energy
    - Borehole gravity monitoring of CO2 sequestration, SECARB Cranfield
  • GEDEX/Anadarko
    - Binary inversion of gravity and gravity gradiometry data for SEAM Phase I salt model
  • Sky Research
    - Cooperative development and application of new magnetic and time-domain EM technologies for UXO remediation projects


Publications, Expanded Abstracts, Software Packages:
- Note: This list may fall behind. If so, please see the publications page for the group which is more regularly updated.

  • 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.

Professional Reports:
  • Annual Reports: Gravity & Magnetics Research Consortium
    - 2000 - Present (investigator, author, building annual reports)
  • Annual Reports: SERDP Project MM-1638: Advance UXO detection and discrimination using magnetic data based on extended Euler deconvolution and shape identification through multipole moments
    - 2008 - Present (PI, author, building annual reports)
  • Annual & Final Reports: SERDP Project MM-1414: Improving UXO detection and discrimination in magnetic environments
    - 2008 - Present (Co-PI, author, building annual and final reports)
  • Annual & Final Reports: SERDP Project MM-1642: Enhancedment of magnetic data by stable downward continuation for UXO application
    - 2008 - 2010 (Co-PI, author, building annual and final reports)
  • Annual & Final Reports: SERDP Project MM-1640: Enhancement of Transient Electro-Magnetic (TEM) data and noise characterization by principal component analysis (PCA)
    - 2008 - Present (Co-PI)

Professional Societies:
  • Society of Exploration Geophysicists (SEG)
    - Near-Surface Geophysics Section (NSGS)
  • American Geophysical Union (AGU)
  • The Institute of Electrical & Electronics Engineers (IEEE)
    - Geoscience and Remote Sensing Society
  • Australian Society of Exploration Geophysicists (ASEG) - in application
  • Environmental and Engineering Geophysical Society (EEGS) - past member
  • Society of Geophysics Graduate Students, Colorado School of Mines (SGGS)
    2002 – 2003 academic year: President
    2001 – 2002 academic year: Treasurer
  • The Scotch Malt Whiskey Society (ok, that one's personal, not professional)