Publications and Presentations

A selection of recent or pertinent technical work of interest to Orion Geomechanics LLC is listed here; for a complete listing please visit https://www.raschultzunr.net/publications.

Books

  1. Schultz, R.A. (2019), Geologic Fracture Mechanics, Cambridge University Press, 608 pp., ISBN 9781107189997, doi: 10.1017/9781316996737 (released in UK in August 2019, and everywhere from September 2019). Also available on Amazon!

Edited Volumes

  1. Daemen, J.J.K., and R.A. Schultz, editors (1995), Rock Mechanics: Proceedings of the 35th U.S. Symposium, Balkema, Rotterdam, 922 pp.
  2. Schultz, R.A., and R. Siddharthan, editors (1998), Proceedings of the 33rd Symposium on Engineering Geology and Geotechnical Engineering, University of Nevada, Reno, 267 pp.Planetary Tectonics
  3. Watters, T.R., and R.A. Schultz, editors (2010), Planetary Tectonics, Cambridge University Press, 518 pp.
  4. Schultz, R.A., guest editor (2019), Special issue containing the best and keynote peer-reviewed papers from ARMA’s 52nd US Rock Mechanics/Geomechanics Symposium, in Rock Mechanics and Rock Engineering, 52, 4863–5821, December 2019.
  5. Miocic, J., N. Heinemann, K. Edlmann, J. Alcade, A. Sundal, and R.A. Schultz, editors (2022), Secure Subsurface Storage for Future Energy Systems, Geological Society of London Special Publication, in progress.

Major Technical Reports

  1. Schultz, R.A. (1991–1993), Multiple proprietary technical reports for precious-metals mining companies including Newmont Gold Company, Noranda Exploration, Inc., Kennecott Exploration Company (all in Nevada).
  2. Schultz, R.A. (1997), 2D microtopography of ramps and graben terminations at Canyonlands National Park, Chevron Petroleum Technology Company, San Ramon, California.
  3. Schultz, R.A. (2007–2008), Proprietary technical reports for Shell International Exploration and Production Company, Houston, Texas.
  4. Schultz, R.A. (1988–2011), Multiple technical progress and final reports to funding agencies including NASA, DOE, NSF, U.S. National Research Council, and American Chemical Society/Petroleum Research Fund.
  5. Schultz, R.A. (2011–2015), Authored approximately 50 significant internal technical reports and presentations to technical workshops and senior management for ConocoPhillips Company (through March 2015).
  6. Schultz, R.A. (2015–2017), Multiple technical reports to industry sponsors of UT’s FRAC Consortium including ExxonMobil and Shell.
  7. States First (now State Oil & Gas Regulatory Exchange), Interstate Oil & Gas Compact Commission, and Ground Water Protection Council (2017), Underground Gas Storage Regulatory Considerations: A Guide for State and Federal Regulatory Agencies; May 2017, 122 p. I was the lead author on Chapter 7, Reservoir Integrity. The published report can be found here.
  8. Schultz, R.A. (2016–present), Multiple technical reports to companies serving the gas storage industry.

Research Papers

  1. Schultz, R.A. (1988), Stress intensity factors for curved cracks obtained with the displacement discontinuity method, International Journal of Fracture, 37, R31–R34.
  2. Schultz, R.A. (1989), Strike-slip faulting of ridged plains near Valles Marineris, Mars, Nature, 341, 424–426.
  3. Aydin, A., and R.A. Schultz (1990), Effect of mechanical interaction on the development of strike-slip faults with echelon patterns, Journal of Structural Geology, 12, 123–129.
  4. Schultz, R.A., and A. Aydin (1990), Formation of interior basins associated with curved faults in Alaska, Tectonics, 9, 1387–1407.
  5. Schultz, R.A. (1991), Structural development of Coprates Chasma and western Ophir Planum, central Valles Marineris rift, Mars, Journal of Geophysical Research, 96, 22,777–22,792.
  6. Schultz, R.A. (1992), Mechanics of curved slip surfaces in rock, Engineering Analysis with Boundary Elements, 10, 147–154.
  7. Schultz, R.A. (1993), Brittle strength of basaltic rock masses with applications to Venus, Journal of Geophysical Research, 98, 10,883–10,895.
  8. Li, Q., and R.A. Schultz (1994), Uniaxial strength testing of Calico Hills tuff, Yucca Mountain: Preliminary results, Proceedings, 5th International Conference on High Level Radioactive Waste Management, 2106–2111, American Society of Civil Engineers.
  9. Schultz, R.A., M.C. Jensen, and R.C. Bradt (1994), Single crystal cleavage of brittle materials, International Journal of Fracture, 65, 291–312.
  10. Schultz, R.A. (1995), Limits on strength and deformation properties of jointed basaltic rock masses, Rock Mechanics and Rock Engineering, 28, 1–15.
  11. Piscoran, P.L., and R.A. Schultz (1995), Evolving fracture arrays and associated changes in rock mass properties, Proceedings, 6th International Conference on High Level Radioactive Waste Management, 6–8, American Society of Civil Engineers.
  12. Schultz, R.A., and Q. Li (1995), Uniaxial strength testing of nonwelded Calico Hills tuff, Yucca Mountain, Nevada, Engineering Geology, 40, 287–299.
  13. Bruhn, R.L., and R.A. Schultz (1996), Geometry and slip distribution in normal fault systems: Implications for mechanics and fault-related hazards, Journal of Geophysical Research, 101, 3401–3412.
  14. Schultz, R.A. (1996), Relative scale and the strength and deformability of rock masses, Journal of Structural Geology, 18, 1139–1149.
  15. Moore, J.M., and R.A. Schultz (1999), Processes of faulting in jointed rocks of Canyonlands National Park, Utah, Geological Society of America Bulletin, 111, 808–822. (pdf reprint)
  16. Schultz, R.A. (1999), Understanding the process of faulting: Selected challenges and opportunities at the edge of the 21st century, Journal of Structural Geology, 21, 985–993. (pdf reprint)
  17. McGill, G.E., R.A. Schultz, and J.M. Moore (2000), Fault growth by segment linkage: An explanation for scatter in maximum displacement and trace length data from the Canyonlands Grabens of SE, Utah: Discussion, Journal of Structural Geology, 22, 135–140. (pdf reprint)
  18. Schultz, R.A. (2000), Growth of geologic fractures into large-strain populations: Review of nomenclature, subcritical crack growth, and some implications for rock engineering, International Journal of Rock Mechanics and Mining Sciences, 37, 403–411. (pdf reprint)
  19. Schultz, R.A. (2000), Localization of bedding plane slip and backthrust faults above blind thrust faults: Keys to wrinkle ridge structure, Journal of Geophysical Research, 105, 12,035–12,052. (pdf reprint)
  20. Schultz, R.A., and H. Fossen (2002), Displacement-length scaling in three dimensions: The importance of aspect ratio and application to deformation bands, Journal of Structural Geology, 24, 1389–1411. (pdf reprint)
  21. Watters, T.R., R.A. Schultz, M.S. Robinson, and A.C. Cook (2002), The mechanical and thermal structure of Mercury’s early lithosphere, Geophysical Research Letters, 29, 10.1029/2001GL014308, June 14, 2002. (pdf reprint)
  22. Wilkins, S.J., R.A. Schultz, R.C. Anderson, J.M. Dohm, and N.C. Dawers (2002), Deformation rates from faulting at the Tempe Terra extensional province, Mars, Geophysical Research Letters, 29, 1884, 10.1029/2002GL015391, September 25, 2002. (pdf reprint)
  23. Schultz, R.A. (2002), Stability of rock slopes in Valles Marineris, Mars, Geophysical Research Letters, 29, 1932, 10.1029/2002GL015728, October 11, 2002. (pdf reprint)
  24. Grosfils, E.B., R.A. Schultz, and G. Kroeger (2003), Geophysical exploration within northern Devils Lane graben, Canyonlands National Park, Utah: Implications for sediment thickness and tectonic evolution, Journal of Structural Geology, 25, 455–467. (pdf reprint)
  25. Wilkins, S.J., and R.A. Schultz (2003), Cross faults in extensional settings: Stress triggering, displacement localization, and implications for the origin of blunt troughs at Valles Marineris, Mars, Journal of Geophysical Research, 108, 5056, 10.1029/2002JE001968. (pdf reprint)
  26. Schultz, R.A. (2003), A method to relate initial elastic stress to fault population strains, Geophysical Research Letters, 30, 1593, 10.1029/2002GL016681, June 13, 2003. (pdf reprint)
  27. Schultz, R.A., and C.M. Balasko (2003), Growth of deformation bands into echelon and ladder geometries, Geophysical Research Letters, 30, 2033, 10.1029/2002GL018449, October 18, 2003. (pdf reprint)
  28. Benedicto, A., R. Schultz, and R. Soliva (2003), Layer thickness and the shape of faults, Geophysical Research Letters, 30, 2076, 10.1029/2002GL018237, October 31, 2003. (pdf reprint)
  29. Okubo, C.H., and R.A. Schultz (2005), Evolution of damage zone geometry and intensity in porous sandstone: Insight from strain energy density, Journal of the Geological Society of London, 162, 939–949. (pdf reprint)
  30. Soliva, R., R.A. Schultz, and A. Benedicto (2005), Three-dimensional D-L scaling and maximum dimension of normal faults in layered rocks, Geophysical Research Letters, 32, L16302, 10.1029/2005GL023007, August 16, 2005. (pdf reprint)
  31. Wilkins, S.J., and R.A. Schultz (2005), 3-D cohesive end zone model for source scaling of strike-slip intraplate earthquakes, Bulletin of the Seismological Society of America, 95, 2232–2258. (pdf reprint)
  32. Schultz, R.A., and R. Siddharthan (2005), A general framework for the occurrence and faulting of deformation bands in porous granular rocks, Tectonophysics, 411, 1–18. (pdf reprint)
  33. Okubo, C.H., and R.A. Schultz (2006), Near-tip stress rotation and the development of deformation band stepover geometries in mode II, Geological Society of America Bulletin, 118, 343–348. (pdf reprint) Cover Photo
  34. Neuffer, D.P., R.A. Schultz, and R.J. Watters (2006), Mechanisms of slope failure on Pyramid Mountain, a subglacial volcano in Wells Gray Provincial Park, British Columbia, Canadian Journal of Earth Sciences, 43, 147–155. (pdf reprint)
  35. Schultz, R.A., C.H. Okubo, and S.J. Wilkins (2006), Displacement-length scaling relations for faults on the terrestrial planets, Journal of Structural Geology, 28, 2182–2193. (pdf reprint)
  36. Okubo, C.H., and R.A. Schultz (2007), Compactional deformation bands in Wingate Sandstone; additional evidence of an impact origin for Upheaval Dome, Utah, Earth and Planetary Science Letters, 256, 169–181. (pdf reprint)
  37. Fossen, H., R.A. Schultz, Z.K. Shipton, and K. Mair (2007), Deformation bands in sandstone: A review, Journal of the Geological Society of London, 164, 755–769. (pdf reprint)
  38. Nahm, A.L., and R.A. Schultz (2007), Outcrop-scale properties of Burns Formation at Meridiani Planum, Mars, Geophysical Research Letters, 34, L20203, 10.1029/2007GL031005, October 24, 2007. (pdf reprint)
  39. Soliva, R., and R.A. Schultz (2008), Distributed and localized faulting in extensional settings: Insight from the North Ethiopian Rift – Afar transition area, Tectonics, 27, TC2003, doi:10.1029/2007TC002148. (pdf reprint)
  40. Schultz, R.A., and H. Fossen (2008), Terminology for structural discontinuities, American Association of Petroleum Geologists Bulletin, 92, 853–867. (pdf reprint) Cover Photo
  41. Soliva, R., A. Benedicto, R.A. Schultz, L. Maerten, and L. Micarelli (2008), Displacement and interaction of normal fault segments branched at depth: Implications for fault growth and potential earthquake rupture size. Journal of Structural Geology, 30, 1288–1299. (pdf reprint)
  42. Schultz, R.A., R. Soliva, H. Fossen, C.H. Okubo, and D.M. Reeves (2008), Dependence of displacement-length scaling relations for fractures and deformation bands on the volumetric changes across them, Journal of Structural Geology, 30, 1405–1411. (pdf reprint)
  43. Schultz, R.A., D. Mège, and H. Diot (2008), Emplacement conditions of igneous dikes in Ethiopian Traps, Journal of Volcanology and Geothermal Research, 178, 683–692. (pdf reprint)
  44. Okubo, C.H., R.A. Schultz, M.A. Chan, G. Komatsu, and the HiRISE Team (2009), Deformation band clusters on Mars and implications for subsurface fluid flow, Geological Society of America Bulletin, 120, 474–482. (pdf reprint)
  45. Schultz, R.A. (2009), Scaling and paleodepth of compaction bands, Nevada and Utah, Journal of Geophysical Research, 114, B03407, doi:10.1029/2008JB005876. (pdf reprint)
  46. Polit, A.T., R.A. Schultz, and R. Soliva (2009), Geometry, displacement-length scaling, and extensional strain of normal faults on Mars with inferences on mechanical stratigraphy of the Martian crust, Journal of Structural Geology, 31, 662–673. (pdf reprint)
  47. Fossen, H., R.A. Schultz, E. Rundhovde, A. Rotevatn, and S.J. Buckley (2010), Fault linkage and graben stepovers in Canyonlands (Utah) and the North Sea Viking Graben, with implications for hydrocarbon migration and accumulation, American Association of Petroleum Geologists Bulletin, 94, 597–613. (pdf reprint)
  48. Klimczak, C., R.A. Schultz, R. Parashar, and D.M. Reeves (2010), Cubic law with aperture-length correlation: Implications for network scale fluid flow, Hydrogeology Journal, 18, 851–862. (pdf reprint)
  49. Solum, J.G., J.P. Brandenburg, O.V. Kostenko, S.J. Wilkins, and R.A. Schultz (2010), Characterization of deformation bands associated with normal and reverse stress states in the Navajo Sandstone, Utah, American Association of Petroleum Geologists Bulletin, 94, 1453–1475. (pdf reprint)
  50. Schultz, R.A., C.H. Okubo, and H. Fossen (2010), Porosity and grain size controls on compaction band formation in Jurassic Navajo Sandstone, Geophysical Research Letters, 37, L22306, doi: 2010GL044909. (pdf reprint)
  51. Benedicto, A., and R.A. Schultz (2010), Stylolites in limestone: Magnitude of contractional strain accommodated and scaling relationships, Journal of Structural Geology, 32, 1250–1256. (pdf reprint)
  52. Schultz, R.A. (2011), Relationship of compaction bands in Utah to Laramide fault-related folding, Earth and Planetary Science Letters, 304, 29–35. (pdf reprint)
  53. Key, W.R.O., and R.A. Schultz (2011), Fault formation in porous rocks at high strain rates: First results from the Upheaval Dome impact crater, Utah, USA, Geological Society of America Bulletin, 123, 1161–1170. (pdf reprint)
  54. Fossen, H., R.A. Schultz, and A. Torabi (2011), Conditions and implications for compaction band formation in Navajo Sandstone, Utah, Journal of Structural Geology, 33, 1477–1490. (pdf reprint)
  55. Klimczak, C., R. Soliva, R.A. Schultz, and J. Chéry (2011), Growth of deformation bands in a multilayer sequence, Journal of Geophysical Research, 116, B09209, doi:10.1029/2011JB008365. (pdf reprint)
  56. Olson, J.E., and R.A. Schultz (2011), Comment on “A note on the scaling relations for opening mode fractures in rock” by C.H. Scholz, Journal of Structural Geology, 33, 1523–1524. (pdf reprint)
  57. Schultz, R.A., and R. Soliva (2012), Propagation energies inferred from deformation bands in sandstone, International Journal of Fracture, 176, 135–149. (pdf reprint)
  58. Klimczak, C., and R.A. Schultz (2013), Fault damage zone origin of the Teufelsmauer, Subhercynian Cretaceous Basin, Germany, International Journal of Earth Sciences (Geologische Rundschau), 102, 121–138; doi:10.1007/s00531-012-0794-z. (pdf reprint)
  59. Schultz, R.A., C. Klimczak, H. Fossen, J.E. Olson, U. Exner, D.M. Reeves, and R. Soliva, (2013), Statistical tests of scaling relationships for geologic structures, Journal of Structural Geology, 48, 85–94 (#1 most downloaded article through March 2013). (pdf reprint)
  60. Soliva, R., R.A. Schultz, G. Ballas, A. Taboada, C. Wibberley, E. Saillet, and A. Benedicto (2013), A new model of cataclastic band system formation as a function of tectonic setting, burial and material properties; new insight from Provence (southern France), Journal of Structural Geology, 49, 50–63. (pdf reprint)
  61. Klimczak, C., and R.A. Schultz (2013), Localized compaction in dilating materials, International Journal of Rock Mechanics and Mining Sciences, 64, 139–147. (pdf reprint)
  62. Schultz, R.A., L.E. Summers, K.W. Lynch, and A.J. Bouchard (2014), Subsurface containment assurance program: Key element overview and best practice examples, paper OTC 24851 presented at the 2014 Offshore Technology Conference Asia, March 25–28, 2014, Kuala Lumpur, Malaysia. (pdf reprint)
  63. Schultz, R.A., X. Tong, K.A. Soofi, D.T. Sandwell, and P.H. Hennings (2014), Satellite interferometry and the detection of active deformation associated with faults in Suban field, South Sumatra Basin, Indonesia, Proceedings, Indonesian Petroleum Association, 38th Annual Convention and Exhibition, Jakarta Convention Center, May 21–23, 2014. (pdf reprint)
  64. Schultz, R.A., Tong, X., Soofi, K.A., D.T. Sandwell, and P.H. Hennings (2014), Using InSAR to detect active deformation associated with faults in Suban field, South Sumatra Basin, Indonesia, The Leading Edge, 33, 882–888. (pdf reprint)
  65. Schultz, R.A., U. Mutlu, and A. Bere (2016), Critical issues in subsurface integrity, paper ARMA 16–037 presented at the 50th US Rock Mechanics/Geomechanics Symposium, Houston, Texas, June 26–29, 2016. (pdf reprint)
  66. Yue, K., J.E. Olson, and R.A. Schultz (2016), Calibration of stiffness and strength for layered rocks, paper ARMA 16–460 presented at the 50th US Rock Mechanics/Geomechanics Symposium, Houston, Texas, June 26–29, 2016. (pdf reprint)
  67. Lee, H., J.E. Olson, and R.A. Schultz (2016), The interaction analysis of propagating opening mode fractures with veins using discrete element method, paper ARMA 16–769 presented at the 50th US Rock Mechanics/Geomechanics Symposium, Houston, Texas, June 26–29, 2016. (pdf reprint)
  68. Schultz, R.A. (2016), Causes and mitigation strategies of surface hydrocarbon leaks at heavy-oil fields: Examples from Alberta and California, Petroleum Geoscience, 22, doi 10.1144/petgeo2016-070. (journal link)
  69. Schultz, R.A., and D. Vereide (2017), Post-Aliso Canyon regulations focus on natural gas storage reliability, Oil and Gas Journal, 115, 76–80, April 3, 2017. (pdf reprint)
  70. Schultz, R.A., C. Chabannes, and D. Vereide (2017), An asset integrity management system for underground natural gas storage in solution-mined salt caverns, paper presented at the Spring 2017 Solution Mining Research Institute Technical Conference, Albuquerque, New Mexico, April 23–26, 2017. (pdf reprint)
  71. Evans, D.J., and R.A. Schultz (2017), Analysis of occurrences at underground fuel storage facilities and assessment of the main mechanisms leading to loss of storage integrity, paper ARMA 17–265 presented at the 51st US Rock Mechanics/Geomechanics Symposium, San Francisco, California, June 25–28, 2017. (pdf reprint)
  72. Razavi, O., H.P. Lee, J.E. Olson, and R.A. Schultz (2017), Characterization of naturally fractured reservoirs using drilling mud loss data: The effects of fluid leak-off and fracture permeability, paper ARMA 17–855 presented at the 51st US Rock Mechanics/Geomechanics Symposium, San Francisco, California, June 25–28, 2017.
  73. Razavi, O., H.P. Lee, J.E. Olson, and R.A. Schultz (2017), Drilling mud loss in naturally fractured reservoirs: Theoretical modeling and field data analysis, paper 17ATCE-P-2581-SPE presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, October 9–11, 2017.
  74. Lee, H.P., J.E. Olson, and R.A. Schultz (2018), Numerical analysis of interaction between propagating opening mode fractures with veins using the Discrete Element Method, International Journal of Rock Mechanics and Mining Sciences, 103, 275–288.
  75. Yue, K., J.E. Olson, and R.A. Schultz (2018), Layered modulus effect on fracture modeling and height containment, paper 2898691 presented at the Unconventional Resources Technology Conference, Houston, Texas, July 23–25, 2018.
  76. Wang, W., J.E. Olson, M. Prodanović, and R.A. Schultz (2018), The impact of natural fracture thickness on hydraulic fracture interaction mechanics, paper 2902343 presented at the Unconventional Resources Technology Conference, Houston, Texas, July 23–25, 2018.
  77. Wang, W., J.E. Olson, M. Prodanović, and R.A. Schultz (2018), Interaction between cemented natural fractures and hydraulic fractures assessed by experiments and numerical simulations, Journal of Petroleum Science and Engineering, 167, 506–516.
  78. Yue, K., J.E. Olson, and R.A. Schultz (2019), The effect of layered modulus on fracture modeling and height containment, paper SPE-195683-PA, SPE Drilling and Completion, 34, doi:10.2118/195683-PA.
  79. Almansour, A., S.E. Laubach, J.E. Bickel, and R.A. Schultz (2019), Value of information analysis of a fracture prediction method, paper SPE-198906-PA, SPE Reservoir Evaluation & Engineering, 22, doi:10.2118/198906-PA.
  80. Schultz, R.A., D.W. Hubbard, D.J. Evans, and S.L. Savage (2019), Characterization of historical methane occurrence frequencies from US underground natural gas storage facilities with implications for risk management, operations, and regulatory policy, Risk Analysis, 39, doi:10.1111/risa.13417; published online November 6, 2019 (printed as Risk Analysis, 40, March 2020, 588–607). Corrigendum, Risk Analysis, 41, published online February 6, 2021; https://doi.org/10.1111/risa.13710.
  81. Yue, K., H.P. Lee, J.E. Olson, and R.A. Schultz (2020), Apparent fracture toughness for LEFM applications in hydraulic fracture modeling, Engineering Fracture Mechanics, 230, 106984, May 1; https://doi.org/10.1016/j.engfracmech.2020.106984.

  82. Schultz, R.A., and D.J. Evans (2020), Occurrence frequencies and uncertainties for US underground natural gas storage facilities by state, Journal of Natural Gas Science and Engineering, 84, paper 103630, December, 2020;  https://doi.org/10.1016/j.jngse.2020.103630.

Presentations

  1. Capturing risk and integrating workflows in the post- Aliso Canyon era (Chabannes, C., and R.A. Schultz), paper presented at the 15th Annual Platts Gas Storage Outlook Conference, Houston, Texas, January 12–13, 2017.
  2. Analysis of occurrences at underground fuel storage (UFS) facilities and assessment of the main mechanisms leading to loss of storage integrity (Evans, D., and R.A. Schultz), presented at the Energy Geosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, June 29, 2017.
  3. Subsurface integrity and risk management planning for underground natural gas storage, presented at the Energy Geosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, June 29, 2017.
  4. Subsurface integrity and risk mitigation for underground natural gas storage, Lunch and Learn presented at the Texas Oil and Gas Institute, Houston, Texas, August 1, 2017.
  5. Panelist, “Rulemakings and Regulations,” and presentation on “Bayesian benchmarking of leakage rates for underground natural gas storage facilities” at the 16th Annual Platts Gas Storage Outlook Conference, Houston, Texas, January 8, 2018.
  6. Bayesian benchmarking of leakage rates for underground natural gas storage facilities, presented at US Pipeline and Hazardous Materials Safety Administration (PHMSA), Houston office, February 16, 2018.
  7. Subsurface integrity and risk mitigation for US underground natural gas storage facilities, presented at Université Paris-Saclay, Orsay, France, September 11, 2018.
  8. Subsurface integrity, leakage rates and risk mitigation for US underground natural gas storage facilities, presented at Geostock-Entrepose, Paris, France, September 13, 2018.
  9. Subsurface integrity, leakage rates and risk mitigation for US underground natural gas storage facilities, presented at STORENGY, Paris, France, September 14, 2018.
  10. Subsurface integrity and risk mitigation for US underground natural gas storage facilities, presented at Université Montpellier II, France, September 19, 2018.
  11. How can we reduce leakage risk at underground natural gas storage facilities?, presented at Université Montpellier II, conférences appliquées, France, September 21, 2018.
  12. How can we quantify leakage rates at underground natural gas storage facilities?, presented at Underground Storage Committee meeting, International Gas Union, San Francisco, California, October 30–November 2, 2018.
  13. How can we characterize leakage risk at underground natural gas storage facilities?, presented at Bureau of Economic Geology, The University of Texas at Austin, March 29, 2019 (INVITED)
  14. Certification of US underground natural gas storage facilities, presented at Underground Storage Committee meeting, International Gas Union, Prague, Czech Republic, May 21–22, 2019.
  15. Natural gas storage opportunities in the US, presented to Nafta a.s., Bratislava, Slovakia, May 24, 2019 (INVITED).
  16. Schultz, R.A., D.W. Hubbard, D.J. Evans, and S.L. Savage (2019), Characterizing off-normal occurrence and leakage risk at underground natural gas storage facilities, presented at the 4th Applied Geoscience Geomechanics Conference: Through the Life Cycle of the Field, Houston Geological Society, November 6–7, 2019.
  17. Schultz, R.A., D.W. Hubbard, D.J. Evans, and S.L. Savage (2019), Bayesian benchmarking of off-normal occurrence rates for US underground natural gas storage facilities, Eos (Transactions, American Geophysical Union), 100, supplement, PA21B–1130; doi:10.1002/essoar.10501131.1.
  18. Schultz, R.A., and D.J. Evans (2020), State-by-state comparison of off-normal occurrence frequencies for US underground natural gas storage facilities, to be presented at European Geosciences Union (EGU), Geophysical Research Abstracts, 22, EGU/2020–1387 (presentation given remotely due to global Covid-19 pandemic).

  19. Schultz, R.A., and D.J. Evans (2021), Bayesian occurrence frequencies for US underground natural gas storage facilities, paper IPPTC 20218904 to be presented at International Petroleum and Petrochemical Technology Conference on “Transforming Oil & Natural Gas Industry through Intelligence,” Beijing, China, 8–10 June 2021 (presentation given remotely).

  20. Schultz, R.A., B.A. Schwartz, and the Underground Storage and Utilization Technical Committee of ARMA (2021), Toward net-zero: Securing the nation’s energy supply through underground energy storage and utilization, presented at the 2021 Annual Forum of the Ground Water Protection Council, session on “Energy Issues & Trends,” Salt Lake City, Utah, September 28, 2021 (presentation given remotely).

  21. Schultz, R.A., Underground energy storage and the energy transition, Invited seminar presented to the Energy Resources and Petroleum Engineering Program, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, 27 October 2021 (Thomas Finkbeiner, sponsor; presentation given remotely).