Browsing Earth and Ocean Sciences by Issue Date
Now showing items 21-34 of 34
-
Modelling fluid flow through fractured rock: Examples using TVZ geothermal reservoirs
(New Zealand Geothermal Workshop, 2015-11-18)Geothermal resources are often hosted within volcanic, plutonic, and basement-type lithologies. As such their matrix permeability can be very low and the transport and circulation of geothermal fluids will be dominated by ... -
Methods and techniques employed to monitor and manage carbon capture and sequestration (CCS) induced seismicity
(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 ... -
Exploring structure and stress from depth to surface in the Wairakei Geothermal Field, New Zealand
(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, ... -
Calcite sealing in a fractured geothermal reservoir: Insights from combined EBSD and chemistry mapping
(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 ... -
Damaged beyond repair? Characterising the damage zone of a fault late in its interseismic cycle, the Alpine Fault, New Zealand
(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 ... -
Identifying the sources and sinks of CDOM/FDOM across the Mauritanian Shelf and their potential role in the decomposition of superoxide (O2- )
(Frontiers Media, 2016-08-03)Superoxide (O−2O2-) is a short lived reactive oxygen species (ROS) formed in seawater by photochemical or biological sources, it is important in the redox cycling of trace elements and organic matter in the ocean. The ... -
Geothermal structural geology in New Zealand: Innovative characterisation and micro-analytical techniques
(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 ... -
Quantitative geometric description of fracture systems in an andesite lava flow using terrestrial laser scanner data
(Elsevier, 2017-06-03)Permeability hosted in andesitic lava flows is dominantly controlled by fracture systems, with geometries that are often poorly constrained. This paper explores the fracture system geometry of an andesitic lava flow formed ... -
Tectonic structure and permeability in the Taupô Rift: new insights from analysis of LiDAR derived dems
(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 ... -
Discussion between a reservoir engineer and a geologist: permeability identification from completion test data and borehole image logs integration
(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 ... -
Volcanic texture identification and influence on permeability using a borehole resistivity image log in the Whakamaru Group Ignimbrite, Wairakei Geothermal Field, New Zealand
(Workshop on Geothermal Reservoir Engineering, 2018-02-12)Discerning the contributions to fluid flow in a geothermal reservoir from intrinsic and structural permeability components is an important, yet difficult task. High-quality, resistivity borehole image log data (Formation ... -
International ocean discovery program expedition 372 preliminary report: creeping gas hydrate slides and Hikurangi LWD, 26 November 2017 - 4 January 2018
(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 ... -
Arsenic in groundwater in south west Ireland: Occurrence, controls, and hydrochemistry
(Frontiers Media, 2018-12-18)Globally numerous regions have been identified with elevated arsenic within groundwater which can result in potential adverse health risks. In Ireland, a previous national-scale research assessment of groundwater identified ... -
Discovery and recovery of an exceptional accumulation of carboniferous echinoids at Hook Head, Wexford
(Royal Irish Academy, 2022-09-30)Geoconservation is a burgeoning area of activity within the Earth sciences and the preservation of significant fossil finds remains crucial for the advancement of palaeontological knowledge and protection of geoheritage. ...