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CO2-Plume Geothermal (CPG) - and related - publications:

(For all Geofluids Group Publications, click here.)


At the time of publication:
  bold = author from the geofluids research group at UMN
  bold* = postdoc author from the geofluids research group at UMN
  bold underlined = student author from the geofluids research group at UMN


Refereed Journal Publications           (published or in press, i.e., accepted)

Randolph*, J.B., and M.O. Saar, Impact of reservoir permeability on the choice of subsurface geothermal heat exchange fluid: CO2 versus water and native brine, GRC Transactions, in press since May 21, 2011.
PDF | Funding: IREE, DE-EE0002764

Randolph, J.B., and M.O. Saar, Combining geothermal energy capture with geologic carbon dioxide sequestration, Geophys. Res. Lett., 38, L10401, doi:10.1029/2011GL047265, 2011.
PDF | Funding: IREE, DE-EE0002764

Randolph, J.B. and M.O. Saar, Coupling carbon dioxide sequestration with geothermal energy capture in naturally permeable, porous geologic formations: Implications for CO2 sequestration, Energy Procedia, 4, 2206-2213, DOI: 10.1016/j.egypro.2011.02.108, 2011.
PDF | Funding: IREE, DE-EE0002764

Saar, M.O., Review: Geothermal heat as a tracer of large-scale groundwater flow and as a means to determine permeability fields, special theme issue on Environmental Tracers and Groundwater Flow, editor-invited peer-reviewed contribution, Hydrogeology Journal, 19:31-52, DOI 10.1007/s10040-010-0657-2, 2011. A Hydrogeology Journal Editor's Choice Article for 2011.
PDF | Funding: NSF-EAR-0838541, NSF-DMS-0724560, NSF-EAR-0941666, DE-EE0002764

Randolph, J.B. and M.O. Saar, Coupling geothermal energy capture with carbon dioxide sequestration in naturally permeable, porous geologic formations: A comparison with enhanced geothermal systems, Geothermal Research Council Transactions, 34, 433-438, 2010.
PDF Funding: DOE-DE-EE0002764, IREE

Saar, M.O., M.C. Castro, C.M. Hall, M. Manga, and T.P. Rose, Quantifying magmatic, crustal, and atmospheric Helium contributions to volcanic aquifers using all stable noble gases: Implications for magmatism and groundwater flow, Geochemistry Geophysics Geosystems, Vol. 6, Nr. 3, Q03008, DOI:10.1029/2004GC000828, 2005.
PDF | Funding: U. of Michigan Turner Postdoctoral Fellowship and UCRP, LLNL



Non-Refereed Publications           (theses, dissertations, reports)

Randolph, J.B.,, Coupling geothermal energy capture with carbon dioxide sequestration in naturally permeable, porous geologic formations - a novel approach for expanding geothermal energy utilization, Ph.D. Dissertation, 211 pp., University of Minnesota - Minneapolis, 2011. Dissertation Adviser: M.O. Saar
pdf-dissertation (19.8 MB)

Randolph, J.B., and M.O. Saar, Preliminary numerical modeling of CO2 injection and storage in deep saline aquifers: Current research, scenarios, and required data, in Potential capacity for geologic carbon sequestration in the Midcontinent Rift System in Minnesota, Thorleifson, L. H., ed., Minnesota Geological Survey Open File Report OFR-08-01, 138 p, 2008.
pdf-report (7.4 MB)

Andrews, J.L., and M.O. Saar, Coupling and decoupling of heat and helium transport in a geothermal reservoir, Proceedings, TOUGH Symposium 2006, Lawrence Berkeley National Laboratory, Berkeley, CA, 9 p., May 15-17, 2006.
pdf-proceedings (867 KB)



Abstracts           (for conference presentations as talks or posters)

2011

  • Luhmann*, A.J., K. Ding*, M.O. Saar, and W.E. Seyfried, Effects of small-scale chemical reactions between supercritical CO2 and arkosic sandstone on large-scale permeability fields: An experimental study with implications for geologic carbon sequestration, American Geophysical Union (AGU) Abstract, San Francisco Conference, 2011.

  • Tutolo, B.M., W.E. Seyfried, and M.O. Saar, An Assessment of Thermodynamic Database Effects on Reactive Transport Models' Predictions of Permeability Fields: Insights from CO2/Brine Experiments, American Geophysical Union (AGU) Abstract, San Francisco Conference, 2011.

  • Saar, M.O., and J.B. Randolph*, Multicomponent CO2-Brine Simulations of Fluid and Heat Transfer in Sedimentary-Basin Geothermal Systems: Expanding Geothermal Energy Opportunities, American Geophysical Union (AGU) Abstract, San Francisco Conference, 2011.

  • Kong*, X., and M.O. Saar, Effects of Permeability Heterogeneity on Density-driven Convection during CO2 Dissolution Storage in Saline Aquifers, American Geophysical Union (AGU) Abstract, San Francisco Conference, 2011.

  • Saar, M.O., Multiphase, multicomponent simulations and experiments of reactive flow, relevant for combining geologic CO2 sequestration with geothermal energy capture, Bulletin of the American Physical Society, 64th Annual Meeting of the APS Division of Fluid Dynamics, Volume 56, Number 18, 2011.

  • Bordoloi, A.D., E.K. Longmire, Kong*, X., and M.O. Saar, Investigation of drop motion through circular orifices, Bulletin of the American Physical Society, 64th Annual Meeting of the APS Division of Fluid Dynamics, Volume 56, Number 18, 2011.

  • Saar, M.O., Combining Geothermal Energy Capture with CO2 Sequestration, E3 Conference, Institute on the Environment (IonE), Initiatitive for Renewable Energy and the Environment (IREE), University of Minnesota, Minneapolis, Nov. 7, 2011.

  • Randolph*, J.B., and M.O. Saar, Impact of reservoir permeability on the choice of subsurface geothermal heat exchange fluid: CO2 versus water and native brine, Geothermal Resources Council Annual Meeting, October 25, 2011.

  • Kong*, X., and M.O. Saar, An evaluation of relative permeability and the capillary pressure-saturation relationship in porous media lattice-Boltzmann methods, Geological Society of America (GSA), Abstracts with Programs, Vol. 43, No. 5, p. 80, 2011.

  • Randolph*, J.B., and M.O. Saar, Carbon-dioxide plume geothermal (CPG) systems, an alternative engineered geothermal system (EGS): Net energy production potential compared to traditional water-based geothermal systems, Geological Society of America (GSA), Abstracts with Programs, Vol. 43, No. 5, p. 40, 2011.

  • Tutolo, B.M., W.E. Seyfried Jr., M.O. Saar, A comparison between popular geochemical thermodynamic data sets and near-equilibrium experimental data, Geological Society of America (GSA), Abstracts with Programs, Vol. 43, No. 5, p. 108, 2011.

    Toot, R.K., B. Tutolo, J.B. Randolph, S.A. Alexander*, J. Nelson, M.O. Saar, A Comparison of the Wheatstone Bridge and Kelvin Connection for High-Precision Temperature Versus Depth, Geotherm, Measurements, Minnesota Groundwater Association Conference, May 2011.

    Saar, M.O., B. Adams, J. Bielicki, B. Janke, T. Kuehn, A. Mevison, C. Parker, M. Pollak, J.B. Randolph, A. Smale, S. Taff, and E. Wilson, Carbon dioxide plume geothermal (CPG) energy: Making electricity (and $$) from geologic sequestration of carbon dioxide, 10th Annual Conference on Carbon Capture and Sequestration, Pittsburgh, USA, May 2-5, 2011.

    Randolph, J.B., and M.O. Saar, Coupling geothermal energy capture with carbon dioxide sequestration in naturally permeable, porous geologic formations - a novel approach for expanding and enhancing geothermal energy utilization - and related fundamental topics regarding fluid and heat flow in porous and fractured geologic media, Doctoral Dissertation Fellowship Presentation, University of Minnesota, April 2011.


    2010

    Saar, M.O. and W.E. Seyfried, Jr., Toward development of parameters for permeability field variations due to fluid-rock reactions during geologic CO2 sequestration, submitted as American Geophysical Union (AGU) Abstract, San Francisco Conference, 2010.

    Randolph, J.B. and M.O. Saar, Carbon-dioxide plume geothermal (CPG) systems, an alternative engineered geothermal system (EGS) that does not require hydrofracturing: Comparison with traditional EGS regarding geologic reservoir heat energy extraction and potential for inducing seismicity, submitted as American Geophysical Union (AGU) Abstract, San Francisco Conference, 2010.

    Walsh*, S.D.C., M.O. Saar, and J.B. Randolph, Pore-scale lattice-Boltzmann fluid flow simulations in super-critical CO2/brine/rock systems using graphics processing units, submitted as American Geophysical Union (AGU) Abstract, San Francisco Conference, 2010.

    Randolph, J.B. and M.O. Saar, Using CO2 sequestration or enhanced oil and gas recovery to enhance geothermal resources, submitted as GSA Abstracts with Programs Vol. 42, No. 5, 2010.

    Nelson, J.M., M.O. Saar, and J.B. Randolph, Numerical simulation of supercritical CO2 plume evolution in the Illinois Basin and geothermal heat flow study of Minnesota, NSF-REU intern postern presentation, Department of Geology and Geophysics, University of Minnesota, August 12, 2010.

    Randolph, J.B. and M.O. Saar, Coupling carbon dioxide sequestration with geothermal energy capture in naturally permeable, porous geologic formations: Implications for CO2 sequestration, International Conference on Greenhouse Gas Technologies (GHGT-10) , Amsterdam, Netherlands, Abstract, Sep. 19-23, 2010.


    2009

    Saar, M.O., and J. Randolph, Coupling geothermal energy capture with carbon dioxide sequestration in permeable, porous geologic formations I: Overview and discussion, Eos Trans. AGU, Fall Meet. Suppl., Abstract, 2009.

    J. Randolph, and M. O. Saar, Coupling geothermal energy capture with carbon dioxide sequestration in permeable, porous geologic formations II: Numerical modeling and preliminary results, Eos Trans. AGU, Fall Meet. Suppl., Abstract, 2009.

    Saar, M.O. and J. Randolph, Coupling carbon dioxide sequestration with geothermal energy capture, Geological Society of America Abstracts with Programs, Vol. 41, No. 7, p. 173, 2009.

    Randolph, J., and M.O. Saar, TOUGH2 modeling of coupled CO2 fluid flow and heat transfer in geothermal reservoirs with CO2 as working fluid, TOUGH Symposium 2009, Lawrence Berkeley National Laboratory, Berkeley, CA, Sep. 14-16, 2009.


    2008

    Randolph, J.B., and M.O. Saar, Geologic CO2 sequestration in saline aquifers accounting for dual permeability/porosity environments, Eos Trans. AGU, Fall Meet. Suppl., 2008.


    2007

    Randolph, J., M.O. Saar, C. Farrar, and S. Hurwitz, Using Transient Temperature-Depth Data to Constrain Groundwater Flow Velocities in Thermal Aquifers of Long Valley Caldera, California, Eos Trans. AGU, Fall Meet. Suppl., Abstract H33M-06, talk, 2007.


    2006

    Andrews, J.L., M.O. Saar, and S. Finsterle, Heat and Helium Transport: The Effect of Subsurface Processes on Near-Surface Signals, Eos Trans. AGU, Fall Meet. Suppl., Abstract H43A-0477, 2006.

    Saar, M.O., and J.L. Andrews, Groundwater as a Sampling Tool and Transfer Function for Magmatic Heat and Gases to Constrain Hot Spot Dynamics, Eos Trans. AGU, Fall Meet. Suppl., Abstract V51D-1701, 2006.

    Hurwitz, S., C.D. Farrar, J. Randolph, and M.O. Saar, Anomalous Hydrothermal Activity in Hot Creek Gorge Area, Long Valley Caldera, California, USA, Eos Trans. AGU, Fall Meet. Suppl., Abstract V53A-1742, 2006.

    Andrews, J.L., and M.O. Saar, Modeling of helium and heat transport in an extensional basin using the noble gas module EOSN in TOUGH2, submitted to the TOUGH2 Symposium, Lawrence Berkeley National Laboratory, Berkeley, CA, May 15-17, 2006.


    2005

    Saar, M.O., Helium isotopes as a natural tracer in volcanic and non-volcanic aquifers, MGWA fall conference, Nov. 18, 2005.

    Hurwitz, S., M.O. Saar, L. Mastin, and J. Major, Volcano Hydrology, special session at the AGU Spring meeting in New Orleans, May 23-27, 2005.


    2004

    Saar, M.O., M.C. Castro, C.M. Hall, M. Manga, and T.P. Rose, Mantle Contributions to Groundwater in the Oregon Cascades and Eastern Oregon Inferred from Helium Isotopes, GSA National Meeting - Denver, Vol. 36, Nr. 5, p. 469 (talk 202-6), Nov. 7-10, 2004.

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