Jon's Expertise:

Geothermal Engineering

Structural Geology and Rock Mechanics

Fractured Reservoir Characterisation

Professional Affiliations:                 


Fellow of the Geological Society of London




Petroleum Exploration Society of Great Britain

                                                     European Association of Geologists and Engineers

                                                     Seismic Hazard Working Party (Nuclear Electric, 1986 to 2000)

Jon Gutmanis

Geology Consultant 


Jons love of geology began with fieldwork in SW England as a teenager and he is still amazed at how a hobby somehow metamorphosed into a career. Although semi retired Geologists usually love the subject too much to quit, so he now provides advice and support to our in house team, as well as being a non executive director. Any opportunity to tackle geological puzzles especially those involving fieldwork is happily taken. He also loves to teach geology in the Pyrenees. 


2017 to Present – Geological Consultant.

  • Since taking semi-retirement in 2017 he has provided ongoing technical support to GeoScience for projects within both hydrocarbon and geothermal resource exploration and development, as well as continuing as a non-executive director

  • He managed the Geology team for the United Downs Geothermal Power Project including site operations and interpretation of the data acquired during drilling and wireline logging of two deep wells in fractured granite, plus liaison and interaction with other project Delivery Partners such as the BGS

  • He has also provided technical supervision of a number of other GeoScience feasibility studies for geothermal resource development in the UK

1985 - 2017  - GeoScience Limited. Chief Geologist. Non-Executive Director since 2015. 

  • Manager of the Reservoir Geology Group within GeoScience covering sedimentology, diagenesis, fractured reservoir characterisation (FRC) and geomechanics

  • Responsibility for the marketing, development and management of FRC

  • Over 30 years experience of technical work, project supervision and financial control of a range of projects worldwide, in formations ranging from Pre-Cambrian basement to Tertiary sediments  

  • Detailed knowledge of structural geology, fracture characterisation and geomechanics techniques for fracture modelling workflows, including application to reserve estimations in fractured reservoirs, and operational issues such as drilling, logging and testing

  • Responsible for development and delivery of training courses and field schools in Fractured Reservoir Characterisation in the UK, the Spanish Pyrenees, the Middle East and the Far East, as well as customised field trips for major operators

  • Experience ranges across the hydrocarbons E & P industry, the geothermal industry especially deep geothermal, gas storage projects, carbon sequestration projects, and the nuclear industry (seismic hazard evaluations and deep nuclear waste disposal projects) ​

1985 to 1997 – Senior Project Geologist.

  • Characterisation of sub-surface fracture and fault systems from well and seismic data, including their permeability and flow properties

  • Took a major role in the investigations for an underground repository for UK radwaste at Sellafield (1989 to 1997): technical and financial management of data acquisition and interpretation, together with preparation of technical reports for Public Inquiries

  • Leader of multi-contractor and multi-disciplinary teams covering a wide range of earth science applications

  • Other work included development of geological models for geothermal reservoir developments (USA, Indonesia), for nuclear installations in the UK and France, and for hydrocarbon reservoirs

  • Specialisation in remote sensing interpretations (e.g. radar interferometry at an onshore oilfield in the Far East) and in fault activity dating

1977 to 1985 – Geologist, Soil Mechanics Limited.

  • Structural geology and remote sensing interpretations in the UK for seismic hazard assessments 

  • Lithological and fracture logging of core from a Devonian geothermal exploration borehole in London

  • Structural interpretation and advisory services to hardrock tunnelling projects in the UK

  • Research project to collect historical data on UK seismicity and evaluate earthquake intensities  

  • Geological and geotechnical consultancy on a range of engineering projects in the UK and Eire


BSc (Hons), Geology, University of Wales 

MSc, Structural Geology and Rock Mechanics, Imperial College, London 

Technical Papers

Fracture analysis of outcrop analogs in the south-central Pyrenees to support modelling of the sub-seismic fracture system in carbonate reservoirs,  south-central Pyrenees. In: Sub-seismic scale Reservoir Deformation, Geological Society of London Special Publication 459, 2018

Reservoir characterisation and modelling in the fractured basement plays of Yemen. In: Petroleum Geology of the Middle East, Geological Society Petroleum Group Meeting October 2003; and GEO 2004 Conference and Exhibition, Bahrain, March 2004.

From fracture characterisation to reservoir modelling in a producing Cambrian quartzite reservoir, Algeria (2002).  In: Petex 2002, Petroleum Exploration Society of Great Britain Conference and Exhibition, London.  And EAGE 65th  Annual Conference and Exhibition Stavanger June 2003.  With K A Foxford, M Bowler, A Lahmar, J Lorsong. 

Characterising fractured granite reservoirs including the role of geomechanics (2001).  In: 'Hydrocarbons in Crystalline Rocks', Geological Society of London, Petroleum Group meeting. With A.S.Batchelor.

Fluid flow in faults : a study of fault hydrogeology in Triassic Sandstone and Ordovician volcaniclastic rocks at Sellafield, NW England (1998). In: Procedings of the Yorkshire Geological Society, Vol.52, Pt.2, pp.159-175.

Flow zone characterisation - understanding the nature of flow in fractured rocks and the influence of major structure (1996). In: Abstracts of ‘Faulting, Fault Sealing and Fluid Flow in Hydrocarbon Reservoirs’, TSG/PESGB Conference, Leeds University.

Geological and hydrogeological characterisation of fracture systems in hard rocks (1995). In: Procedings of  ‘Fractures - A Cracking Good Seminar’, London Petrophysical Society. With G.W.Lanyon.

Geological characterisation of groundwater flow entries identified during production logging of deep boreholes in fractured basement rocks at Sellafield, NW England (1995). In: Procedings of ‘Structural Geology in Reservoir Characterisation and Field Development’, Imperial College, London. With P.Ledingham, R.A.Pearson and G.W.Lanyon.

Scientific drilling and geological overview for the proposed United Kingdom radioactive waste repository (1994). In: Procedings of the VIIth International Symposium on the Observation of the Continental Crust through Drilling, Santa Fe, New Mexico. With R.A.Bowden.

The use of dating techniques to constrain the age of fault activity: a case history from north Somerset, United Kingdom (1991). Quarterly Journal of Engineering Geology, Vol.24, pp.363-374. With R.H.Maddock, E.Hailwood, and C.Vita-Finzi.

New understanding of geological structure based on a remote sensing study at a geothermal field in southern California, USA (1990). IMM Conference on ‘Remote Sensing: An Operational Technology for the Mining and Petroleum Industries’, pp.133-140. With H.M.H.Lee.

Aspects of the Holocene depositional history of the Dungeness Area, Kent (1990). Procedings of the Geologists Association, Vol.101(3), pp.225-37. With J.T.Greensmith.

Wrench faults, pull-apart basins, and volcanism in central Oregon: a new tectonic model based on image interpretation (1989). Geological Journal, Vol.24(3), pp.183-192.

East Mesa remote sensing study (1988). Prepared for Geo Operator Corporation, California. With R.A.Whittle and H.M.H.Lee.

A geological prognosis for proposed deep boreholes at United Downs and Point Mills, Truro, Cornwall (1987). Prepared for Geothermal Resources (UK) Limited. With H.M.H.Lee.

Newberry Crater Landsat study (1986). Prepared for Geo Operator Corporation, California. With R.A.Whittle and H.M.H.Lee.

Satellite imagery applied to investigations of geological structure as part of recent seismic hazard studies in the UK (1985). Proc. Conf., Earthquakes and Earthquake Engineering in Britain, Soc. for Earthquake and Civil Engineering Dynamics, Cambridge University. With R.W.Holt and R.A.Whittle.

Using satellite imagery to detect faults (1983). Ground Engineering. With R.A.Whittle and D.T.Shilston.

Engineering geology for a major industrial complex at Aughinish Island, Co Limerick, Ireland (1981). Quarterly Journal of Engineering Geology, Vol.14, pp.231‑239. With R.G.Clark, A.E.Furley and P.G.Jordan.

Presentations/ Posters

Reservoir characterisation by integration of outcrop analogs with in situ stress profiling of a fractured carbonate reservoir. Geology of Geomechanics Conference, Geological Society of London, October 2015.

Application of Pyrenean fractured carbonate outcrops for sub-surface reservoir characterisation. 77th EAGE Conference and Exhibition, Madrid, June 2015.

Application of Pyrenean fractured carbonate outcrops for reservoir characterisation. Presentation at: ‘Reducing sub-surface uncertainty and risk through field-based studies’, Geological Society of London, Petroleum Group meeting, March 2014.

Fracture and dynamic characterisation in a stress sensitive anticline at Miran West, Kurdistan. In: Hydrocarbon Exploration in the Zagros Mountains of Iraqi Kurdistan and Iran. Geological Society of London, Petroleum Group meeting, January 2013.

Application of Pyrenean fractured carbonate outcrops for sub-surface reservoir characterisation. 72nd EAGE Conference and Exhibition, Barcelona, June 2010.

Basement Reservoirs: A review of their geological and production characteristics. International Petroleum Technology Conference, December 2009, Doha Quatar.