Greg Bignall


Full Name: Greg Bignall

Position: Senior Scientist; Head of Department: Geothermal Science

Contact details

Email: G.Bignall
Phone: +64-7-376 0161


1985: BSc; 1987: MSc, Geology; 1990: Dip. Energy Technology, Geothermal; 1995: PhD, Geology

Areas of expertise

Geochemist: Fluid inclusions
Geochemist: Geothermal chemistry
Geology: Field mapping
Geology: Geothermal
Geology: Hydrothermal alteration mapping
Geology: Petrography
Geology: Petrology
Geology: Team Leader / Project Management

Professional activities

New Zealand Geothermal Association: Member
Geothermal Resources Council (US): Member
Geothermal Research Society of Japan: Member
Mutnovsky Science Drilling Project: ICDP: Lead Researcher: Hydrothermal Alteration
Geothermics - International Journal of Geothermal research and its Applications: Associate Editor (Asia-Pacific Region), Reviewer

Major publications

Bignall, G.; Hirano, N.; Batkhishig, B.; Tsuchiya, N.; Rusk, B.; Sekine, K. 2004 SEM-CL imaging of hydrothermal quartz : lessons and applications. p. 615-619 IN: Wanty, R.B.; Seal, R.R. (eds) Water-rock interaction : proceedings of the eleventh International Symposium on Water-Rock Interaction, 27 June - 2 July 2004, Saratoga Springs, New York, USA. Leiden, The Netherlands: Balkema

Bignall, G.; Sekine, K.; Tsuchiya, N. 2004 Fluid-rock interaction processes in the Te Kopia Geothermal Field (New Zealand) revealed by SEM-CL imaging. Geothermics, 33(5): 615-635; doi: 10.1016/j.geothermics.2004.03.001

Sekine, K.; Bignall, G.; Tsuchiya, N. 2004 Application of synthetic fluid inclusions to simultaneous temperature-pressure logging in high-temperature (sub- to supercritical) geothermal systems. Geothermics, 33(6): 775-793; doi: 10.1016/j.geothermics.2004.05.003

Bando, M.; Bignall, G.; Sekine, K.; Tsuchiya, N. 2003 Petrography and uplift history of the Quaternary Takidani Granodiorite; could it have hosted a supercritical (HDR) geothermal reservoir? Journal of Volcanology and Geothermal Research, 120(3/4): 215-234; doi: 10.1016/S0377-0273(02)00399-2

Sekine, K.; Bignall, G.; Tsuchiya, N.; Nakatsuka, K. 2001 Evidence for fluid flow in non-brittle Takidani Granite; implications for utilization of DSGRs. Transactions (Geothermal Resources Council), 25: 243-248

Tsuchiya, N.; Hirano, N.; Bignall, G.; Nakatsuka, K. 2001 Supercritical water-rock interaction for development of deep-seated geothermal reservoirs. p. 209-212 IN: Cidu, R. (ed.) Water-rock interaction : proceedings of the Tenth International Symposium on Water-Rock Interaction WRI-10, Villasimius, Italy, 10-15 July 2001. Lisse: A.A. Balkema

Bignall, G.; Browne, P.R.L.; Kyle, P.R. 1996 Geochemical characterisation of hydrothermally altered ignimbrites in active geothermal fields from the Central Taupo Volcanic Zone, New Zealand. Journal of Volcanology and Geothermal Research, 73(1-2): 79-97; doi: 10.1016/0377-0273(96)00015-7

Short CV Greg Bignall joined GNS Science in April 2004, following a 4-year faculty appointment in the Graduate School of Engineering, Tohoku University (Japan). Since obtaining a PhD (1995) from the Geothermal Institute (University of Auckland), Greg has gained extensive experience in resource assessment, exploration and development, and well services geoscience (incl. New Zealand, Indonesia, Japan, Mongolia, Iran). His present work focuses on geothermal resource assessment, production well chemistry, managing GNS Sciences’ geological well-services, undertaking research on fluid-mineral interactions as well as providing expert witness testimony for geothermal resource development hearings. Greg also leads New Zealand’s “Hotter and Deeper” Geothermal Research Programme.

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