b'CommitteesASEG news2. A major component of the projectJoe confirmed their current depths asGippsland for deployment in February is to design on-campus laboratory1080 m and 1010 m, respectively, duringor March 2023. The borehole is ~140 m experiments to test, calibrate, and assesshis first field campaign using a fishingdeep, has standing water level ~7 m the sources of noise, dynamic range andline and sinker. Both bores exceed thebelow ground level, and intersects a coal to compare the accuracy and precision ofmaximum cable lengths of the DTSseam at about 60 m depth.CWPTS and DTS systems. If possible, locateand wireline (~950 m) temperature a shallow borehole close to metropolitansensors available to UoM at the start of8. Fourth field campaign will collect new Melbourne to test equipment beforeJoes project. To log the lower portiondata from boreholes in zones of potential deploying to Gippsland. of the bores, we commissioned a newconvective heat transfer. Interpret the 1500 m single-ended fibre optic DTSdata for evidence of convection.Joe has assembled the appropriatecable which arrived in March 2022 apparatus in UoMs petrophysicsA fourth field campaign might be and is planned for deployment fromplanned to further utilise the a-DTS laboratory and calibrated all the relevantDecember 2022 to January 2023. We sensors (thermistor-based wireline toolsdepending on the outcomes of the third also commissioned a new double- field campaign.and DTS fibre optic cables) to knownended 1000 m fibre optic DTS cable (the precision and accuracy. Additionally,maximum recommended length for a9. Model the data from all field Joe has constructed a new thermaldouble-ended cable using UoMs DTScampaigns to extract important control bath system for real-time DTSsystem), which is due to arrive in Januarygeothermal parameters to derive data quality control in the field. A2023 and will be deployed shortlyconclusions for the hypothesis.new 1500 m long portable, reusablethereafter.DTS fibre optic sensor cable has beenThe anticipated timeframe for this task is constructed (in collaboration with CSIRO5. Critically compare CWPTS dataJanuaryJuly 2023.Energy), calibrated, and is ready for(master temperature values) with DTS10. Draw conclusions about suitability of deployment into two deep (1000 m)data to identify any in-situ factors that bores in Gippsland. A second new DTSaffect accuracy and precision. CWPTS, DTS and aDTS for determining sensor cable, 950 m long and configuredheat flow in boreholes and refine differently, will arrive from CSIRO EnergyThe second field campaign, plannedGippsland geothermal exploration in January 2023. for December 2022 to January 2023,strategies.will provide the DTS field data for 3. The first field campaign we willcomparison. Joe has, however, madeThe anticipated timeframe for this task is acquire CWPTS data to establish mastersome comparison tests under laboratoryJanuaryJuly 2023.temperature values and analyse spatialconditions. RF22M01. Monash University BSc (Hons) thermal perturbations to determine the6. Locate appropriate holes for inStudent Audrey Quealy (Supervisor Dr optimal dynamic range for DTS. Checksitu thermal conductivity tests usingRobin Amit).for borehole structures using boreholeaDTS, ideally boreholes with thick, televiewer tool to assess the minimumGeophysical expression of crustal-scale required DTS spatial and temporalhomogenous geological sectionsfaults and their links to metallogenic resolution. and core samples to allow laboratoryepochs of the Mossman Orogen, determinations of conductivity. Queensland. (Subtitle Palaeozoic Evolution Joe carried out field campaigns fromJoe has not been able to deploy UoMsof Northeast Queensland: Implications late December 2021 through Julyactive DTS (aDTS) system with 300 mfrom the Inkerman Metamorphics).2022, beginning as soon as possibleand 500 m cables to measure thermalThe Tasmanides, which make up after COVID travel restrictions lifted inconductivity in situ. The aDTS system hasthe eastern third of the Australian late 2021. During this programme, Joeproven impractical for field deploymentcontinent, are a series of broadly N-S deployed fully calibrated thermistor- due to its requirements in terms oftrending orogenic belts formed through based wireline temperature sensors toborehole characteristics (diameter, depth,Palaeozoic, progressively eastward collect baseline precision temperaturewater level) and surface equipmentaccretionary tectonics. Whilst this ~N-S logs in the seven boreholes mentioned(trailer mounted generator, highstructural grain is preserved across much above. The borehole televiewer hasvoltage, exposed live wires, electricianof northeast Queensland, anomalous not been required. Well completionrequired on site, security required). As angeometries, including the ENE-WSW-reports and drillers logs have providedalternative, CSIRO Energy collaboratedtrending Charters Towers Province sufficient information about boreholeon a field trial of a smaller 100 m a-DTS(Thomson Orogen), indicate an intricately structures. system in South Australia in Novembercomplex and vastly overprinted tectonic 4. The second field campaign will involve2022 and is willing to deploy the systemevolution, which has been interpreted data collecting by DTS monitoring inin Gippsland for Joes project. to relate to orocline formation. In this the same boreholes as the first field7. The third field campaign will acquirestudy, a lithostructural geophysical campaign using the established dynamicin-situ thermal rock conductivity datainterpretation of the junction between range, spatial and temporal resolutionusing aDTS. Compare in situ results withthe Connors Subprovince (New from the first field campaign. Confirmlaboratory determinations to confirmEngland Orogen) and Charters Towers reproducibility of temperature profilesreliability. Province was undertaken to assess the across the two sensor types. temporal and spatial relationships and In anticipation of a third field campaignevolution of this major boundary. A Two of the priority boreholes identifiedfocused on in situ thermal conductivityregion of ~35 000 km 2 was selected for logging were drilled to depthsmeasurement using active DTS, Joeand a multidisciplinary approach of 1350 m and 1500 m, respectively.has identified a suitable borehole in(gravity, aeromagnetics, radiometrics APRIL 2023 PREVIEW 8'