b'Education matters instantaneous changes and the secularsand intervals contribute to the poorpegmatite is highly dependent on the drifts in the Helmert parameters forpre-drill definition and prediction. peripheral geology of the deposit, where the two cases respectively. We foundFour depth structure maps weredistinguishable resistivity and magnetic that in both case studies the networkgenerated across the study area: Topsusceptibility contrasts are of great effect is often as large as the changesUpper Angel Formation, Top Lowerimportance.in the Helmert parameters themselves.Angel Formation, Top Eliassen FormationThe implementation of electrical Hence, current space geodetic networksand Top Legendre Formation. At theresistivity imaging and time domain EM are indeed inadequate for verifyingconclusion of this, two prospects werewere to investigate the geological context the geocenter motion predictionsidentified. Prospect A is a tilted faultof a pegmatite deposit, which was to by geophysical models accurately.block associated with an antithetic faultassist in determining the lithological Nevertheless, our simulations validateto the main Rosemary Fault Systemcontent surrounding the pegmatite. the expected bias to be a reasonableand has a Middle Jurassic LegendreSurface mapping techniques were also estimate of the network effect. Finally,Formation reservoir. Prospect B is autilised to provide relationships between we propose an alternative definitionstratigraphic basin floor fan trap with ansurface topography and the geological of the centre of network frame thatOxfordian Eliassen Formation reservoir. conditions, which were to distinguish assigns a weight proportional to thesubsurface continuity in correlation with Voronoi cell surrounding a station toThe QI workflow predicts that the sealthe ERI and TEM datasets.its measurements. We show that it canand reservoir lithologies at Prospect A significantly reduce the network effectare a silty claystone and a sandstoneThe applied geophysical methods and improve the detection of geocenterwith intermittent claystone (50/50)provided significant information motion in most cases. respectively. It was not possible toregarding the topographic and predict the fluid properties as thesubsurface geological content Curtin University, Westernsandstones within the target intervalsurrounding the known pegmatite Australia Honours theses have a high pore stiffness, resultingdeposit, allowing the deposit to in small seismic fluid sensitivity.be distinguished in the highly Thomas Boyle, Curtin University:Deterministic volumetric analysis forheterogeneous environment. These Stochastic forward modelling of AVOProspect A provided an in-place oilfindings promote the implementation of responses, Dampier Sub-basin, Westernvolume of 10.5 million barrels. The QIgeophysical methods for the exploration Australia. workflow was not undertaken for theof lithium pegmatite, and reveal the Prospect B prospect. This was becausebenefits of a cross-interpretation Utilising hydrocarbons as an energya feasibility study implemented for thebetween surface and subsurface source is still predicted to increase bysimilarly configured Hurricane Fieldgeophysics, and drill data.approximately 30% for natural gas andconcluded that a QI workflow was notLauren Found, Curtin University: approximately 20% for oil by 2040 owingsuited for a reservoir with these rockAssessment, characterisation and removal to a slow transition into renewablephysics properties. The most likely reasonof noise in drone-based aeromagnetic energy. The exploration for hydrocarbonsfor this is the high variability in the elasticsurvey data.is consequently still necessary.property models across the study area Simultaneous to this, the difficulty, riskfor the Late Jurassic Eliassen FormationAs modern airborne magnetic surveying and cost of exploration is increasing assandstone. At the conclusion of the studyadvances, so too does the need to more complex reservoirs are exploredthe lack of any prospects with estimatedunderstand and characterise noise for. This makes the tool of Quantitativeresource volumes of sufficient size toas it plays a fundamental role in the Interpretation (QI) paramount. be of economic interest suggests thatassessment of survey quality. In the The specific QI workflow implementedexploration permit WA-X is not veryfield of drone platforms, new sensors in this study, is the forward modellingprospective for further exploration. and systems are being developed as the of amplitude versus offset (AVO)Nicholas Berdal, Curtin University:weight and expense of existing sensors responses using elastic propertyCharacterisation of lithium pegmatitepresent an issue to the more lightweight models from a Dampier Sub-basinusing geophysical methods in the Pilbaradrone system, and this could provide rock physics study undertaken byCraton, Western Australia. new challenges in addressing survey DownUnder GeoSolutions as the inputs.quality and noise.The modelled AVO responses wereThe increase in the demand for raw then compared to the genuine AVObattery materials has evolved the miningThe primary goal of this project is to response observed at hydrocarbonsector to focus upon the explorationunderstand the input each of the noise discoveries identified in the region,and extraction of lithium. Historically,sources contributes to the recorded with the hope of identifying seal andgeological field mapping and well datasignal of a drone-based magnetic reservoir lithologies, and also fluid fillhave been the primary methods of lithiumsurvey, and provide a simple workflow properties. This has been completedpegmatite exploration. These methodsfor minimising their impacts without to test the prospectivity of explorationare intrusive, high cost and inefficient foraffecting the rest of the signal that can permit WA-X in a region of the Northdetailed subsurface mapping. easily be reproduced to allow data Carnarvon Basin with a historically lowLittle literature exists regarding thequality comparisons between different drilling success rate (8%) caused by poordirect use of geophysical techniques fordrone-based datasets as well as between definition and prediction of one or morethe exploration of lithium pegmatite,old and new surveying systems.of: trap, seal or reservoir elements. A lackresulting in such methods to beA drone-based survey in Victoria, of direct hydrocarbon indicators and theapproached with hesitancy. The use ofAustralia was flown and found to inability to accurately predict objectivegeophysics for the characterisation ofhave numerous sources of noise. DECEMBER 2019 PREVIEW 38'