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#Geologic and geophysical setting  Both the Ngatamariki and Rotokawa geothermal fields are located in the southern Taupo Volcano Zone (TVZ) on the North Island of New Zealand; approximately 15 and 20 17  km north of the town of Taupo, respectively. Rotokawa is a high temperature (>300$deg;C) (>300°C between 1 and 2.5 km below sea level)  reservoir with a circular footprint measuring about roughly  6 km across \cite{Sherburn_2015}. Breif overview Ngatamariki, also a high temperature system at >280°C and similar in depth to Rotokawa, measures roughly 7 km^2 \cite{Chambefort_2016}. Sequences of andesites, rhyolites and volcaniclastic sediments overlie greywacke basement at roughly 3 km below sea level at both fields, although lateral heterogeneity of these units is considerable \cite{McNamara_2016} \cite{Chambefort_2014}. The geological structure at Rotokawa is dominated by three faults cutting through the field which have been modeled based on offsets in well cuttings  of the TVZ, basement greywacke as well as  the geothermal fields within it, Rotokawa Andesite /cite{wallis2013structural} \cite{McNamara_2016}. These faults, from West to East are the Production Field Fault (PFF), Central Field Fault (CFF)  and detailed setting Injection Field Fault, the presumed surface traces  for Rotokawa which are shown in \ref{Figure1}. At Ngatamariki, two important features dominate the local geological structure. The first is the Aratiatia Fault Zone in the southern end of the field (\ref{Figure1})  and Ngatamariki.  \cite{Chambefort_2016} the other is a shallow (< 2 km) intrusive body, the presence of which was confirmed by drill cutings from wells NM4, NM8 and NM9 \cite{Chambefort_2014}. Given the low-permeability nature much of the host rock, reservoir permeability at both fields is thought to be dominated by fractures and faults within the reservoirs along the prevailing NE-SW structural trend /cite{McNamara_2016}. However, the structure surrounding the shallow intrusives present in the northern half of Ngatamariki likely complicate the structural grain.