XXXXX, I have generally classified papers, reports, and open source by topic to make it easier to find. However, you can also browse my publication history by date at the bottom of this page.
Borehole Image Analysis
- Fracture width and and aperture analysis (conference presentation and video)
- Geometric sample bias and the blind zone (conference abstract and Jupyter notebook)
- Case studies from New Zealand, Indonesia and the USA:
- Volcanic systems (___, _____ and ___ conference papers)
- Deep circulation systems (___ conference paper)
- Extended leak-off testing in geothermal wells (2020 conference paper)
- Mechanical rock properties (____ conference paper), also refer to ___, ___, and ___ for discussion of how mechanical rock properties influence fracturing
Structure and Geomechanics
- Fracture width and and aperture analysis (conference presentation and video)
- Geometric sample bias and the blind zone (conference abstract and Jupyter notebook)
- Case studies from New Zealand, Indonesia and the USA:
- Volcanic systems (___, _____ and ___ conference papers)
- Deep circulation systems (___ conference paper)
- Extended leak-off testing in geothermal wells (2020 conference paper)
- Mechanical rock properties (____ conference paper), also refer to ___, ___, and ___ for discussion of how mechanical rock properties influence fracturing
- Structural models, comparisons and uncertainties (___ and ___ conference papers)
Permeability
- Doctoral thesis 2023
- Controls on geothermal fluid flux at the district scale (2018 and 2023 conference papers)
- Controls on geothermal fluid flux at the reservoir scale (___ conference paper)
- Key concepts for understanding permeability in geothermal systems (___ conference paper)
Logging and Testing
- Wireline logging geothermal wells (___ conference paper)
- Well test analysis
- DLIS file explainer (Jupyter notebook)
Geothermal Resource Evaluation
- Structural geology and geomechanics workflow for geothermal resource development (flowchart)
- Power density tool
Other
- Advanced geochemical data visualization with Python (conference paper)
Publication History
I've had the honor and pleasure to collaborate with many people over the years. Support from institutions and businesses has also been invaluable for research.
Fercho, S., Norbeck, J., McConville, E., Hinz, N., Wallis, I., Titov, A., Agarwal, S., Dadi, S., Gradl, C., Baca, H., Eddy, E., Lang, C., Voller, K., Latimer, T., (2023). Geology, State of Stress, and Heat in Place for a Horizontal Well Geothermal Development Project at Blue Mountain, Nevada. Proceedings, 48th Workshop on Geothermal Reservoir Engineering.
Wallis, I.C., Milton, A., Brown, Z., Davis, L., Casteel, J., and Peters, B., (2023) Faults, Fractures, Formation, and Stress at Fish Lake: Controls on Wellbore-Scale Permeability in a Deep Circulation Geothermal System. GRC Transactions, Vol. 47.
Rogers, A., Wallis, I.C., Fox, A., (2023) A Comparison of Pre-Drill and Post-Drill In-situ Stress Estimates for the Eavor-DeepTM 18,000 ft-TVD Closed-Loop Geothermal Demonstration Well. GRC Transactions, Vol. 47.
Wallis, I.C., Rowland, J.V., and Dempsey, D.E. (2023) Geologic Controls on Geothermal System Location and Type. Transactions, New Zealand Geothermal Workshop.
Wallis, I.C., Dempsey, D.E., and Rowland, J.V. (2023) Geologic Controls on Permeability Revealed by Borehole Imaging: Case Studies from Sumatra, Indonesia and the Taupō Volcanic Zone, New Zealand. Transactions, New Zealand Geothermal Workshop.
Wallis, I.C., Dempsey, D.E., and Rowland, J.V. (2021). Visualising blind zones in borehole image analysis: An open-source code for addressing the limitations of the Terzaghi correction. First EAGE Workshop on Borehole Geology in Asia Pacific, 30 – 31 March 2021. Perth, Australia. (extended abstract)
Wallis, I., Pye, D.S., Dempsey, D., Rowland, J. (2020) A users guide to leak-off test procedures and interpretation for geothermal wells. Proceedings of the World Geothermal Congress: Reykjavik, Iceland.
Cumming, W., Hinz, H., Wallis, I., Gunderson, R., Scott, S., Sewell, S., Easley, E., Ayling, B., Ussher, G. and Stelling, P., 2020, Geothermal Resource Decision Workshop Curriculum Development: Hands-On Training for Geothermal Resource Professionals, Proceedings World Geothermal Congress: Reykjavik, Iceland
Wallis, I.C., Rowland, J. V., Dempsey, D. E., Allan, G., Sidik, R., Martikno, R., McLean, K., Sihotang, M., Azis, M. and Baroek, M. (2020) Approaches to imaging feedzone diversity with case studies from Sumatra, Indonesia, and the Taupō Volcanic Zone, New Zealand. New Zealand Geothermal Workshop: Waitangi, New Zealand.
Ikhwan, M., Wallis, I.C. and Rowland, J.V. (2020) Geological Model & Permeability Framework of Bukit Daun Geothermal Field, Indonesia. New Zealand Geothermal Workshop: Waitangi, New Zealand.
Sanchez-Alfaro, P., Wallis, I., Reich, M., Iturrieta, P., Perez-Flores, P., and Cembrano, J., (2019) The optimal pathways leading to earthquake-enhanced gold precipitation in the epithermal environment. SEG - South American Metallogeny: Sierra to Craton
Durán, E. L., Adam, L., and Wallis, I. C., (2019) A robust methodology for time picking and error analysis of ultrasonic waveforms and rock densities in the laboratory. Geophysics, v. 84, no. 2, p. MR85-MR97.
Durán, E. L., Adam, L., Wallis, I. C., and Barnhoorn, A., (2019) Mineral alteration and fracture influence on the elastic properties of volcaniclastic rocks. Journal of Geophysical Research: Solid Earth.
Wallis, I. C., Rowland, J. V. and Dempsey, D. E., 2018, The relationship between geothermal fluid flow and geologic context: A global review. GRC Transactions, Volume Vol. 42: Reno, Nevada.
Durán, E. L., van Wijk, K., Adam, L., and Wallis, I. C., (2018) Separating intrinsic and scattering attenuation in full waveform sonic logging with radiative transfer theory. Geophysical Journal International, v. 213, no. 2, p. 757-769.
Sidik, R. P., Mussofan, W., Wallis, I. C., Azis, H., Stimac, J. A., and Ganefianto, N., (2018) Two contrasting geothermal fields in Sumatra, Indonesia: Muara Laboh and Rantau Dedap. New Zealand Geothermal Workshop: Taupo.
Wallis, I. C., Rowland, J. V., Cumming, W. and Dempsey, D. E., 2017, The subsurface geometry of a natural geothermal reservoir. New Zealand Geothermal Workshop: Rotorua, New Zealand.
Wallis, I. C, Sánchez-Alfaro, P., Dempsey, D. E., & Rowland, J. V. (2017) Favourable Reservoir Conditions for Boiling: Exploring the Analogue between Low Sulfidation Epithermal Mineralisation and Modern Geothermal Systems. XV Chilean Geological Congress Abstract and Presentation.
Chambefort, I., Buscarlet, E., Wallis, I. C., Sewell, S., and Wilmarth, M., 2016, Ngatamariki Geothermal Field, New Zealand. Geology, geophysics, chemistry and conceptual model: Geothermics, v. 59, p. 266-280.
McNamara, D. D., Sewell, S., Buscarlet, E., and Wallis, I. C., 2016, A review of the Rotokawa Geothermal Field, New Zealand. Geothermics, v. 59, p. 281-293.
Wallis, I. C., Moon, H., Clearwater, J., Azwar, L. and Barnes, M., 2015, Perspectives on geothermal permeability. Proceedings 37th New Zealand Geothermal Workshop. Taupō, New Zealand.
Buscarlet, E., Moon, H., Wallis, I. C., and Quinao, J., 2015, Reservoir tracer test at the Ngatamariki Geothermal Field, New Zealand Geothermal Workshop: Taupo.
Clearwater, J., Azwar, L., Barnes, M., Wallis, I., and Holt, R., 2015, Changes in injection well capacity during testing and plant start-up at Ngatamariki. Proceedings World Geothermal Congress. Melbourne, Australia.
Durán, E., van Wijk, K., Adam, L., and Wallis, I., 2015a, Separating intrinsic and scattering attenuation in sonic logging of a geothermal field, in Proceedings SEG Technical Program Expanded Abstracts, Volume 34, p. 704-709.
Durán, E., van Wijk, K., Adam, L., and Wallis, I.,2015b, Separating Intrinsic from scattering seismic wave attenuation from sonic logs in a geothermal field, in Proceedings Transactions - Geothermal Resources Council, Volume 39, p. 587-591.
McNamara, D. D., Massiot, C., Lewis, B., and Wallis, I. C., 2015, Heterogeneity of structure and stress in the Rotokawa Geothermal Field, New Zealand: Journal of Geophysical Research: Solid Earth, v. 120, no. 2, p. 1243-1262.
Sewell, S., Cumming, W., Bardsley, C., Winick, J., Wallis., I., Shearburn, S., Bourguignon, S., and Bannister, S., 2015, Interpretation of microseismicity at the Rotokawa Geothermal Field, 2008 to 2012. Proceedings World Geothermal Congress. Melbourne, Australia.
Sherburn, S., Sewell, S. M., Bourguignon, S., Cumming, W., Bannister, S., Bardsley, C., Winick, J., Quinao, J., and Wallis, I. C., 2015, Microseismicity at Rotokawa geothermal field, New Zealand, 2008–2012: Geothermics, v. 54, no. 0, p. 23-34.
Wyering, L. D., Villeneuve, M. C., Wallis, I. C., Siratovich, P. A., Kennedy, B. M., and Gravley, D. M., 2015, The development and application of the alteration strength index equation: Engineering Geology, v. 199, p. 48-61.
Moon, H., Clearwater, J., Franz, P., Wallis, I., and Azwar, L., 2014, Sensitivity analysis, parameter estimation and uncertainty propagation in a numerical model of Ngatamariki Geothermal Field, New Zealand. Thirty-Ninth Workshop on Geothermal Reservoir Engineering. Stanford, CA.
Wyering, L.D., Villenuve, M.C., Wallis, I.C., Siratovich, P.A., Kennedy, B.M., Gravely, D.M., and Cant, J.L., 2014, Mechanical and physical properties of hydrothermally altered rocks, Taupō Volcanic Zone, New Zealand. Journal of Volcanology and Geothermal Research. 288: 76-93.
Wallis, I.C., Bardsley, C., Powell, T., Rowland, J. and O'Brien, J. 2013, A structural model for the Rotokawa Geothermal Field, New Zealand. Proceedings of the New Zealand Geothermal Workshop: Rotorua, New Zealand.
Dempsey, D., Clearwater, J., Kelkar, S. and & Wallis, I., 2013, Validation of a coupled thermal-hydrological-mechanical model though a comparative study of shear stimulation in two geothermal environments: USA and New Zealand. Proceedings of the New Zealand Geothermal Workshop. Rotorua, New Zealand.
Halwa, L., Wallis, I., and Torres Lozada, G., 2013, Geological analysis of the volcanic subsurface using borehole resistivity images in the Ngatamariki Geothermal Field, New Zealand. Proceedings of the New Zealand Geothermal Workshop. Rotorua, New Zealand.
Sewell, S. M., Cumming, W., Bardsley, C. J., Winick, J., Quinao, J., Wallis, I. C., Sherburn, S., Bourguignon, S., and Bannister, S., 2013, Interpretation of Microearthquakes at the Rotokawa Geothermal Field, 2008 to 2012, New Zealand Geothermal Workshop: Rotorua, New Zealand.
Sherburn, S., Bourguignon, S., Bannister, S., Sewell, S., Cumming, W., Bardsley, C., Quinao, J., and Wallis, I. C., 2013, Microseismicity at Rotokawa Geothermal Field, 2008 to 2012, New Zealand Geothermal Workshop: Rotorua, New Zealand.
Wallis, I., McCormick, S., Sewell, S. and Boseley, C., 2012, Formation assessment in geothermal using wireline tools – application and early results from the Ngatamariki Geothermal Field, New Zealand. Proceedings of the New Zealand Geothermal Workshop: Auckland, New Zealand.
Wallis, I. C. McNamara, D. Rowland, J. V. Massiot, C., 2012, The nature of fracture permeability in the basement greywacke at Kawerau Geothermal Field, New Zealand. Proceedings: Workshop on Geothermal Reservoir Engineering. Stanford, California.
Davidson, J., Siratovich, P., Wallis, I., Gravley, D., and McNamara, D., 2012, Quantifying the stress distribution at the Rotokawa Geothermal Field, New Zealand. Proceedings of the New Zealand Geothermal Workshop. Auckland, New Zealand.
Wyering, L., Villeneuve, M., and Wallis, I. C., 2012, The Effects of Hydrothermal Alteration on Mechanical Rock Properties of the Andesite Breccia and Tahorakuri Formation from the Ngatamariki Geothermal Field, New Zealand and Empirical Relations Between Rock Strength and Physical Properties New Zealand Geothermal Workshop: Auckland.
Bristow, C. S., Augustinus, P., Rhodes, E. J., Wallis, I. C., and Jol, H. M., 2011, Is climate change affecting rates of dune migration in Antarctica?: Geology, v. 39, no. 9, p. 831-834.
D'Costa, D., Augustinus, P., and Wallis, I., 2011, An MIS 5a/b to MIS 3 bog sequence from Henderson Bay, northern New Zealand: New Zealand Journal of Geology and Geophysics, v. 54, no. 2, p. 209-216.
Bristow, C. S., Augustinus, P. C., Wallis, I. C., Jol, H. M., and Rhodes, E. J., 2010a, Investigation of the age and migration of reversing dunes in Antarctica using GPR and OSL, with implications for GPR on Mars: Earth and Planetary Science Letters, v. 289, no. 1-2, p. 30-42.
Bristow, C. S., Jol, H. M., Augustinus, P., and Wallis, I., 2010b, Slipfaceless 'whaleback' dunes in a polar desert, Victoria Valley, Antarctica: Insights from ground penetrating radar: Geomorphology, v. 114, no. 3, p. 361-372.
Campbell, K. A., Nelson, C. S., Alfaro, A. C., Boyd, S., Greinert, J., Nyman, S., Grosjean, E., Logan, G. A., Gregory, M. R., Cooke, S., Linke, P., Milloy, S., and Wallis, I., 2010, Geological imprint of methane seepage on the seabed and biota of the convergent Hikurangi Margin, New Zealand: Box core and grab carbonate results: Marine Geology, v. 272, no. 1, p. 285-306.
Wallis, I.C., 2008, Age and genesis of the Victoria Valley Dunefield, McMurdo Dry Valleys, Antarctica. University of Auckland Masters thesis.