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Interpretation of magnetotelluric and airborne electromagnetic inversions from the Proterozoic basins of the Capricorn Orogen, WA
- Publication Name: AEGC 2021
- Authors: Sasha Banaszczyk, Mike Dentith, Perla Piña-Varas, David Annetts
- Date Published: September 2021
Abstract:
Recently, a regional-scale TEMPEST AEM survey and a local-scale MT survey were acquired over the Yerrida Basin in the Capricorn Orogen, WA. These two electromagnetic datasets provide an opportunity to compare the electromagnetic responses from both t...
A method for the downward continuation of gravity data using Padé approximation
- Publication Name: AEGC 2021
- Authors: Chong Zhang, Qingtian Lü, Yayong Yan
- Date Published: September 2021
Abstract:
Downward continuation of exploration gravity or magnetic data is a basic part of many data processing and interpretation techniques. Methods based on Taylor approximations are quick, easy, and visual ways to obtain good results. But for prediction, T...
3D Modelling & Synthesis of Geophysical Data in Nash Creek, New Brunswick, Canada
- Publication Name: AEGC 2021
- Authors: Alexander Furlan, Hernan Ugalde, Alzbeta Ondercova, Bernd Milkereit
- Date Published: September 2021
Abstract:
‘Hotspot’ geophysical exploration has passed its zenith. In areas like New Brunswick, where this exploration style has been successful, deposits with a more complex signature have been left behind. Using improved computational power and geophysic...
Vertically integrated geoscientific data at the Geological Survey of New South Wales
- Publication Name: AEGC 2021
- Authors: Ned Stolz
- Date Published: September 2021
Abstract:
The Geological Survey of New South Wales (GSNSW) has a vertically integrated workflow for delivering geophysical data and products. Raw geophysical data are acquired through regional scale, statewide and national surveys, laboratory measurements, and...
Results from the largest Airborne Electromagnetic (AEM) survey ever flown in NSW
- Publication Name: AEGC 2021
- Authors: Astrid Carlton, Liann Deyssing, et al.
- Date Published: September 2021
Abstract:
The Geological Survey of New South Wales (GSNSW) has mapped potential mineral and groundwater features, and the depth of intense weathering by interpreting a large airborne electromagnetic (AEM) dataset in Central NSW....
The North Australian Craton 3D Gravity and Magnetic Inversion Models – A trial for first pass modelling of the entire continent
- Publication Name: AEGC 2021
- Authors: James A Goodwin, Richard J L Lane
- Date Published: September 2021
Abstract:
As part of the Federal Government’s Exploring for the Future program, whole-of-crust 3D gravity and magnetic inversion models have been produced for an area encompassing the North Australia Craton (NAC). These models were created to aid 3D geologic...
Towards a 3D model of the South-Nicholson Basin region, Northern Australia, for mineral, energy and groundwater assessment
- Publication Name: AEGC 2021
- Authors: Nadege Rollet, Michael Doublier, Chris Southby, et al.
- Date Published: September 2021
Abstract:
The Exploring for the Future Program facilitated the acquisition of major geoscience datasets in northern Australia, where rocks are mostly under cover and the basin evolution, mineral, energy and groundwater resource potential are, in places, poorly...
Overburden measurement for coal mine management with 3D high resolution compressional and shear velocity seismic inversion
- Publication Name: AEGC 2021
- Authors: Claudio Strobbia, Martin Bayly, Denis Sweeney, et al.
- Date Published: September 2021
Abstract:
High resolution surface seismic surveys can provide useful images of coal bed reflections to depths as shallow as 50 to 100 metres. There is also a need, to gain information of the overburden properties above these depths. This information gap can be...
A time-lapse feasibility workflow incorporating core calibrated 4D rock physics models
- Publication Name: AEGC 2021
- Authors: Christian Proud, Ask Frode Jakobsen, Rob Ross, Jason McKenna
- Date Published: September 2021
Abstract:
Rock physics analysis is a useful tool in time-lapse seismic feasibility studies and can help to assess the effect of pressure and saturation changes on the elastic parameters which the seismic data is sampling. Calibration using velocity measurement...
Knowledge-Guided Machine Learning for Komatiite-Hosted Nickel Prospectivity Mapping
- Publication Name: AEGC 2021
- Authors: Minsu Kwon
- Date Published: September 2021
Abstract:
Thanks to the brilliant progress in machine learning, many research works have conducted data-driven mineral prospectivity mapping. However, it is challenging to integrate highly multidisciplinary geoscientific data with machine learning algorithms. ...
An automated system for preventing hydraulic vibrator tip-over during land seismic surveys
- Publication Name: AEGC 2021
- Authors: Richard Barnwell, Tim Dean, Hagay Haviv, et al.
- Date Published: September 2021
Abstract:
Hydraulic vibrators are the preferred source for land seismic surveys. The energy from the vibrator’s signal (commonly referred to as a sweep) is transmitted into the ground via a baseplate that is coupled to the surface by loading it with the weig...
A brief history of 3D seismic acquisition in BHP Coal and some predictions for the future
- Publication Name: AEGC 2021
- Authors: Tim Dean, Matt Grant, Margarita Pavlova
- Date Published: September 2021
Abstract:
BHP Coal acquired their first 3D seismic survey in 1998 at the Goonyella mine site. The survey covered an area of 1.6 km² and utilised a 360 channel cabled recording system and an explosive source to record 15 fold data. Since then BHP has acquired ...
Automated fracture detection and characterization from unwrapped drill-core images using Mask R-CNN
- Publication Name: AEGC 2021
- Authors: Fatimah Alzubaidi, Patrick Makuluni, Stuart R. Clark, et al.
- Date Published: September 2021
Abstract:
Drill cores provide the most reliable fracture information in subsurface formations as they present a clear and direct view of fractures. Core observation and image log interpretation are usually integrated for fracture analysis of underground layers...
Geophysical proxies for redox gradients in IOCG systems: Cloncurry District, Qld, Australia
- Publication Name: AEGC 2021
- Authors: James Austin, Tobias Schlegel, John Walshe, Andreas Bjork, Clive Foss
- Date Published: September 2021
Abstract:
Iron oxide-copper-gold (IOCG) systems, in a broad geophysical sense, include a spectrum of mineralisationstyles ranging from reduced, pyrrhotite-dominant examples, sometimes referred to as iron sulphide coppergold (ISCG) systems, to magnetite-pyrite ...
Environmental Site Assessment at a Mining Operation in Western Australia Using the Loupe TEM Profiling System
- Publication Name: AEGC 2021
- Authors: Remke L. van Dam, Greg Maude, Brendan Ray, Graham Jenke, Russell Mortimer
- Date Published: September 2021
Abstract:
The Loupe TEM is a transient electromagnetic profiling system for efficient mapping of near-surface ground conductivity. The system is operated by a two-person crew who carry the transmitter coil and 3-component receiver coils on backpacks. Benefits ...
The evaluation of alternatives to pre-acquisition surveying for land seismic surveys
- Publication Name: AEGC 2021
- Authors: Tim Dean, Matt Grant
- Date Published: September 2021
Abstract:
Accurate positioning for sources and receivers is a fundamental requirement for land seismic survey acquisition. The introduction of ‘stake-less navigation’ systems, where the vibrator driver uses a GPS guided display to navigate into position, h...
AIP EFFECTS IN AIRBORNE EM FIXED WING SYSTEMS: A SPECTREM THEORETICAL STUDY.
- Publication Name: AEGC 2021
- Authors: Andrea Viezzoli, Francesco Dauti, Nirocca Devkurran, Brad Pitts
- Date Published: September 2021
Abstract:
IP effects can distort airborne EM data, usually producing faster decays and, under certain conditions, changes in signal polarity. These effects, if not recognized and treated with a dispersive resistivity model, often lead to artefacts in the resis...
Impacts of Uncertainty in Minimum Horizontal Stress Determination on Wellbore Stability
- Publication Name: AEGC 2021
- Authors: Matthew Musolino, Simon Holford, Rosalind King
- Date Published: September 2021
Abstract:
The purpose of this study is to highlight sources of uncertainty in the determination of minimum horizontal stress estimates from leak-off tests (LOTs) and their effect on wellbore stability modelling. To achieve this, we use petroleum datasets from ...
Seismic network modelling and design in an interactive web-based environment
- Publication Name: AEGC 2021
- Authors: Pavel Golodoniuc, Januka Attanayake, Abraham Jones, Samuel Bradley
- Date Published: September 2021
Abstract:
To detect and locate earthquakes effectively and accurately, seismologists must design and install a network of seismometers that can capture small seismic signals originating in the sub-surface. A major challenge when deploying an array of seismomet...
A Beautiful Sunset (Clause): Enhancing Statewide Geophysics with High Resolution Company Data
- Publication Name: AEGC 2021
- Authors: Sam Matthews
- Date Published: September 2021
Abstract:
The Geological Survey of NSW (GSNSW) is the custodian of both government and company geophysical data for NSW. In 2020 GSNSW committed to delivering an updated statewide magnetic merge combining government and open file company geophysical data, at a...
Structural controls on late Cambrian mineralisation in the Stavely Arc
- Publication Name: AEGC 2021
- Authors: Robert Holm, Chris Cairns, Jennifer Murphy, et al.
- Date Published: September 2021
Abstract:
The middle-late Cambrian Stavely Arc forms the eastern boundary of the Delamerian Orogen in Victoria, Australia. A pulse of mineralised magmatism at ca. 500 Ma coincided with the collision of VanDieland and related deformation. Porphyry intrusion dur...
Exploring links between thermal maturity and electrical properties of organic-rich shales
- Publication Name: AEGC 2021
- Authors: Claudio Delle Piane, Matthew Josh, Julien Bourdet, David N. Dewhurst, M. Ben Clennell
- Date Published: September 2021
Abstract:
Electrical resistivity is widely used as an effective proxy for detection of organic matter and hydrocarbons in shales. Recently, with more organic-rich shales being studied, it has been noted that resistivity follows a non linear evolution with ther...
3D Bedrock Model Utilising Multi-channel Analysis of Surface Waves to Assist the Land Development Industry in Greater Melbourne, VIC
- Publication Name: AEGC 2021
- Authors: Tavis Lavell
- Date Published: September 2021
Abstract:
A common problem across greater Melbourne’s expanding land development, both residential and commercial, is encountering sites that have incredibly stiff and undulating bedrock. This is experienced on sites with Newer Volcanic Basalt which accounts...
The role of geophysics in the discovery of the Gonneville PGE-NiCu-Co-Au Deposit, Julimar, Western Australia
- Publication Name: AEGC 2021
- Authors: Jacob Paggi, Kevin Frost, Bruce Kendall
- Date Published: September 2021
Abstract:
The Gonneville deposit is a significant new PGE-nickelcopper-cobalt-gold sulphide deposit discovered by Chalice Mining in 2020. Located only 70 km northeast of Perth, Western Australia, it represents the first major discovery of a PGE-rich orthomagma...
Geographic quantile regression forest: a new method for spatial modelling of mineral commodities
- Publication Name: AEGC 2021
- Authors: Kane Maxwell, Mojtaba Rajabi, Joan Esterle
- Date Published: September 2021
Abstract:
Spatial modelling of analysis results such as grade, geochemical properties and density is required for resource estimation in almost all commodities. For spatial modelling of most commodity properties, geostatistical methods are the most popular bec...
Recognising the impact of uncertainty in resource models
- Publication Name: AEGC 2021
- Authors: Steve Sullivan
- Date Published: September 2021
Abstract:
The research aimed to test the variability of geological modelling due to the interpretation bias of the person building the model. Measuring this innate uncertainty in modelling allows stakeholders to have confidence in the models, knowing the level...
Integration of high-resolution HyLogger3 spectral scanner and TESCAN Integrated Mineral Analyser for mineralogical characterisation of shale
- Publication Name: AEGC 2021
- Authors: Muhammad Atif Iqbal, Reza Rezaee, Gregory Smith, Hasnain Ali Bangash
- Date Published: September 2021
Abstract:
The mineralogy of shales is a fundamental parameter because it directly influences petrophysical and geomechanical properties. However, thick shales comprise a heterogeneous succession of very fine-grained strata in which only some thin beds are opti...
High density seismic finally accessible to all industries
- Publication Name: AEGC 2021
- Authors: Amine Ourabah
- Date Published: September 2021
Abstract:
High density seismic has been synonym of high-quality subsurface images and attributes for more than 2 decades now, and although firstly made available by innovative source technologies, the receiver side was lagging behind with bulky, heavy cables a...
H2- From Scientific Research to Commercialised Energy
- Publication Name: AEGC 2021
- Authors: Max Williamson
- Date Published: September 2021
Abstract:
H2 has been and is a tantalising opportunity against which companies and Governments around the world are throwing serious research dollars and resources. Our Federal Government has followed with its National Hydrogen Strategy, plus current start-up ...
Optimising slip-sweep for high-productivity Vibroseis coal surveys
- Publication Name: AEGC 2021
- Authors: Shaun Strong, Dale Harpley, Steve Hearn
- Date Published: September 2021
Abstract:
The increased scale of 3D seismic surveys in the Australian Coal industry has necessitated the use of high-production slip-sweep surveys. A method is provided which provides a quantitative visualisation of harmonic noise expected for different slip p...