A Resource Conceptual Model for the Ngatamariki Geothermal Field Based on Recent Exploration Well Drilling and 3D MT Resistivity Imaging

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Conference Proceedings: A Resource Conceptual Model for the Ngatamariki Geothermal Field Based on Recent Exploration Well Drilling and 3D MT Resistivity Imaging

Abstract

Three successful exploration step-out wells drilled by Rotokawa Joint Venture (RJV) in 2008-2009 at the Ngatamariki Geothermal Field helped demonstrate sufficient resource to support regulatory applications for over 100 MW of generation. This field was discovered in 1984 when four wells were drilled and two wells, about 1 km apart, encountered a permeable 280ºC resource. However, economic and access complications halted further drilling. After initial access was obtained in 2004, RJV conducted MT surveys and completed risk assessments based on a range of conceptual models that supported relatively aggressive well targeting 1.6 to 3 km south of the earlier wells. The resource conceptual models were constrained by integrated interpretations that focused on well results, geochemistry and MT resistivity. The geochemistry from hot springs and well fluids indicated that the hot springs were supplied through a 160ºC intermediate aquifer, not directly from the reservoir. The natural state temperature pattern, flow performance, alteration, and geology data from the wells established the elements of the model that were extrapolated beyond the drilled area using the MT imaging of aquicludes that contained low resistivity

smectite clay associated with low permeability.

Authors 
Catherine Boseley, William Cumming, Luis Urzúa-Monsalve and Tom Powell and Malcolm Grant






Conference 
World Geothermal Congress; Bali, Indonesia; 2010/04/25


Published 
World Geothermal Congress, 2010





DOI 
Not Provided
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Online 
Internet link for A Resource Conceptual Model for the Ngatamariki Geothermal Field Based on Recent Exploration Well Drilling and 3D MT Resistivity Imaging

Citation

Catherine Boseley, William Cumming, Luis Urzúa-Monsalve, Tom Powell and Malcolm Grant. 2010. A Resource Conceptual Model for the Ngatamariki Geothermal Field Based on Recent Exploration Well Drilling and 3D MT Resistivity Imaging. Proceedings of World Geothermal Congress; Indonesia: World Geothermal Congress.