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dc.contributor.authorMcNamara, David D.
dc.contributor.authorMassiot, Cécile
dc.date.accessioned2017-08-14T10:37:41Z
dc.date.available2017-08-14T10:37:41Z
dc.date.issued2016-11-23
dc.identifier.citationMcNamara, David D. , & Massiot, Cécile. (2016). Geothermal structural geology in New Zealand: Innovative Characterisation and micro-analytical techniques Paper presented at the Proceedings 38th New Zealand Geothermal Workshop, Auckland, New Zealand.en_IE
dc.identifier.urihttp://hdl.handle.net/10379/6718
dc.description.abstractMany of New Zealand's geothermal reservoirs are hosted in rocks with low intrinsic permeability. As such, successful development of these resources relies on understanding the role subsurface structures, such as fractures and faults, play in reservoir permeability. Further complexity is added to this understanding due to the constantly evolving permeable nature of these geothermal reservoir structures. The same fractures and faults which operate as interconnected, open, fluid flow pathways, can also behave as fluid flow barriers due to geothermal mineral precipitation over time. Increased industry application of borehole logging technology, and the development of innovative geothermal data processing and interpretation, has allowed structural geologists to make advances in characterising the subsurface structure of the Taupo Volcanic Zone. These novel data reveal structural heterogeneity at a variety of scales, from changing dominant orientations across the Taupo Volcanic Zone, to decimetre changes in fracture orientation within a single well. Additionally, these techniques allow observation of the variability in in situ horizontal stress directions for the first time, revealing active subsurface structures. At a much smaller scale, the application of novel, advanced, microscopy techniques to analyse the micro-structure of geothermal vein minerals provides information on evolving geothermal reservoir fluid properties, and stress conditions. Crystallographic analysis of microstructures found in geothermal calcite veins can provide insight into the differential stress history of the reservoir, while the operation of temperature dependent, calcite crystal slip systems, may provide a tool to record evolving geothermal reservoir temperatures.en_IE
dc.formatapplication/pdfen_IE
dc.language.isoenen_IE
dc.publisherInternational Geothermal Associationen_IE
dc.relation.ispartofNew Zealand Geothermal Workshop 2016en
dc.subjectStructural geologyen_IE
dc.subjectFractureen_IE
dc.subjectBorehole image loggingen_IE
dc.subjectElectron backscatter diffractionen_IE
dc.subjectFluid flowen_IE
dc.subjectCalciteen_IE
dc.subjectQuartzen_IE
dc.subjectScalingen_IE
dc.titleGeothermal structural geology in New Zealand: Innovative characterisation and micro-analytical techniquesen_IE
dc.typeConference Paperen_IE
dc.date.updated2017-07-22T12:27:07Z
dc.local.publishedsourcehttps://www.geothermal-energy.org/publications_and_services/conference_paper_database.htmlen_IE
dc.description.peer-reviewedpeer-reviewed
dc.contributor.funder|~|
dc.internal.rssid11991964
dc.local.contactDavid Mcnamara, -. - Email: david.d.mcnamara@nuigalway.ie
dc.local.copyrightcheckedYes
dc.local.versionPUBLISHED
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