Browsing School of Natural Sciences by Author "McNamara, David D."
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A7 Makaroro River dam site Phase 1C: Field characterisation of possible secondary fault displacement
Langridge, R. M.; Villamor, P.; Litchfield, N. J.; Page, M.; Ries, W.; Ansell, I. A.; McNamara, David D.; Martin Gonzalez, F. (GNS Science, 2013)GNS Science has undertaken a field study to investigate the possibility of active secondary faulting in the vicinity of the proposed A7 dam site on the Makaroro River, central Hawke’s Bay. The A7 site is located c. 750 ... -
Calcite sealing in a fractured geothermal reservoir: Insights from combined EBSD and chemistry mapping
McNamara, David D.; Lister, Aaron; Prior, Dave J. (Elsevier, 2016-05-10)Fractures play an important role as fluid flow pathways in geothermal resources hosted in indurated greywacke basement of the Taupo Volcanic Zone, New Zealand, including the Kawerau Geothermal Field. Over time, the ... -
Comparing borehole televiewer logs with continuous core: An example from New Zealand
Milloy, Sophie Frances; McLean, Katie; McNamara, David D. (International Geothermal Association, 2015-04-19)The use of borehole televiewer logging is a recent addition to the well logging toolkit available to the geothermal industry in New Zealand. The information acquired from borehole televiewer (BHTV) equipment, such as the ... -
A damage mechanics approach to modeling failure in Greywacke rock
Pogacnik, Justin; McNamara, David D.; O’Sullivan, Mike; O’Sullivan, John (New Zealand Geothermal Workshop, 2014)Fracture networks within greywacke basement rocks often control fluid flow in geothermal reservoirs in New Zealand. Thermal, hydrological, chemical, and mechanical processes affect the evolution of these fracture networks. ... -
Damaged beyond repair? Characterising the damage zone of a fault late in its interseismic cycle, the Alpine Fault, New Zealand
Williams, Jack N.; Toy, Virginia G.; Massiot, Cécile; McNamara, David D.; Wang, Ting (Elsevier, 2016-07-25)X-ray computed tomography (CT) scans of drill-core, recovered from the first phase of the Deep Fault Drilling Project (DFDP-1) through New Zealand's Alpine Fault, provide an excellent opportunity to study the damage zone ... -
Discussion between a reservoir engineer and a geologist: permeability identification from completion test data and borehole image logs integration
Massiot, Cécile; McLean, K.; McNamara, David D.; Sepulveda, F.; Milicich, Sarah D. (39th New Zealand Geothermal Workshop, 2017-11-22)The location of permeable zones, and preliminary quantification of a geothermal well’s production or injection capacity are routinely interpreted from well pressure, temperature, and flow measurements made at different ... -
Electron backscatter diffraction (EBSD) in the SEM: applications to microstructures in minerals and rocks and recent technological advancements
Mariani, Elisabetta; Prior, D. J.; McNamara, David D.; Pearce, M.A.; Seaton, N.; Seward, G.; Tatham, D.; Wheeler, J. (Sociedad Española de la Mineralogía, 2008-09-16)Electron backscatter diffraction (EBSD) is based on the principle that a beam of electrons generated in the scanning electron microscope (SEM) is the source of randomly scattered electrons in a specimen. The backscattered ... -
An energy-driven geologist
McNamara, David D. (The New Zealand Association of Scientists, 2013)[No abstract available] -
Exploring structure and stress from depth to surface in the Wairakei Geothermal Field, New Zealand
McNamara, David D.; Bannister, Stephen; Villamor, Pilar; Sepúlveda, Fabian; Milicich, Sarah D.; Alcaraz, Samantha; Massiot, Cécile (International Geothermal Association, 2016-02-22)Structures such as fractures and faults have an important role as fluid flow pathways in geothermal fields, as the reservoir rocks hosting geothermal resources can often have little to no intrinsic permeability. As such, ... -
Fabrics produced mimetically during static metamorphism in retrogressed eclogites from the Zermatt-Saas zone, Western Italian Alps
McNamara, David D.; Wheeler, J.; Pearce, M.; Prior, D.J. (Elsevier, 2012-09-12)Lattice preferred orientations (LPOs) are commonly interpreted to form by dislocation creep. Consequently they are used to infer deformation at the metamorphic grade at which the minerals were stable, especially if those ... -
Feasibility of storing carbon dioxide on a tectonically active margin: New Zealand
Field, B.D.; Lawrence, M.J.; Nicol, A.; McNamara, David D.; Arnot, M.J.; Coyle, F.; Higgs, K.E.; Mountain, B.; Gerstenberger, M.; Daniel, R.; Bunch, M.A.; Barton, B. (American Association of Petroleum Geologists, 2015-09-13)New Zealand's sedimentary basins was found to have available several gigatonnes of CO2 storage capacity. However, CO2 storage is currently untested in New Zealand. The country's position on an active Neogene plate boundary ... -
Fracture geometries and processes in andesites at Mt Ruapehu, New Zealand: implications for the fracture modelling of the Rotokawa Geothermal Field
McNamara, David D.; Nicol, Andrew; Archibald, Garth; Townend, John; Massiot, Cecile (Le Consortium Gocad, 2014-09-16)Fluid flow in the high-temperature (300 C), andesite-hosted Rotokawa geothermal reservoir (Taupo Volcanic Zone (TVZ), New Zealand) is largely controlled by fractures and faults but their geometries are still poorly ... -
Fracture width and spacing distributions from borehole televiewer logs and cores in the Rotokawa Geothermal Field, New Zealand
Massiot, Cécile; McNamara, David D.; Nicol, Andrew; Townend, John (International Geothermal Association, 2015-04-19)The successful targeting of permeable fractures in geothermal fields is aided by understanding the spatial and geometric characteristics of fracture populations. Studies of numerous outcrop, and a limited number of geothermal ... -
Fractures interpreted from acoustic formation imaging technology: Correlation to permeability
McLean, K.; McNamara, David D. (Stanford University, 2011-01-31)Permeable feed zones in geothermal wells are commonly identified using well profiles of temperature, pressure and fluid velocity measured at different injection rates during well completion testing and heat-up. While this ... -
Geothermal structural geology in New Zealand: Innovative characterisation and micro-analytical techniques
McNamara, David D.; Massiot, Cécile (International Geothermal Association, 2016-11-23)Many 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 ... -
Heterogeneity of structure and stress in the Rotokawa Geothermal Field, New Zealand
McNamara, David D.; Massiot, Cécile; Lewis, Brandon; Wallis, Irene C. (American Geophysical Union (AGU), 2015-02-12)Geometric characterization of a geothermal reservoir's structures, and their relation to stress field orientation, is vital for resource development. Subsurface structure and stress field orientations of the Rotokawa ... -
International ocean discovery program expedition 372 preliminary report: creeping gas hydrate slides and Hikurangi LWD, 26 November 2017 - 4 January 2018
McNamara, David D. (Texan A&M University, 2018-03)International Ocean Discovery Program (IODP) Expedition 372 combined two research topics, slow slip events (SSEs) on subduction faults (IODP Proposal 781A-Full) and actively deforming gas hydrate bearing landslides (IODP ... -
Interpretive review of the acoustic borehole image logs acquired to date in the Wairakei-Tauhara Geothermal Field
Massiot, Cécile; McNamara, David D.; Lewis, B. (Institute of Geological and Nuclear Sciences Limited, 2013)[No abstract available] -
Late-interseismic state of a continental plate-bounding fault: Petrophysical results from DFDP-1 wireline logging and core analysis, Alpine Fault, New Zealand
Townend, John; Sutherland, R.; Toy, V. G.; Eccles, J. D.; Boulton, C.; Cox, S. C.; McNamara, David D. (American Geophysical Union (AGU), 2013)We present a geophysical characterization at 0.1-100 m scales of a major plate-bounding continental fault in a late-interseismic state. The Alpine Fault produces M-W approximate to 8 earthquakes every 200-400 years and ... -
Methods and techniques employed to monitor and manage carbon capture and sequestration (CCS) induced seismicity
McNamara, David D. (GNS Science, 2016)This report discusses the topic of induced seismicity resulting from the operations of subsurface CO2 injection at Carbon Capture and Storage (CCS) sites. The potential for induced seismicity to occur in CCS projects is ...