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Helicopter Airborne Electromagnetics at 12.5 Hz – Western Australia Case studies
- Publication Name: AEGC 2021
- Authors: Adam Smiarowski
- Date Published: September 2021
Abstract:
Low base frequency EM provides an advantage to detection of very conductive targets or for exploration with thick conductive cover. A comparison of a 30 Hz and 7.5 Hz system showed significantly better detection to a conductive body at 400 m depth. 1...
Mineral systems and data integration as part of the foundation for the future of mineral exploration
- Publication Name: AEGC 2021
- Authors: Sandra Occhipinti, Vasek Metelka, Hassan Talebi, Dave Cole, Alex Otto
- Date Published: September 2021
Abstract:
As exploration focuses on defining new resources under large Phanerozoic basins and thick unconsolidated cover generic exploration models, following a mineral systems approach will be vital to future exploration programs. Specific ore deposit models ...
The genesis and evolution of laminar carbonates in lacustrine basin: implications for shale oil accumulation
- Publication Name: AEGC 2021
- Authors: Chenyang Bai, Shujun Han, Zhenhuan Shen
- Date Published: September 2021
Abstract:
Shale oil has become a popular topic for global unconventional oil and gas research in the petroleum industry. Recent exploration efforts have indicated that laminar carbonates are closely related to the favorable depositional strata of lacustrine sh...
3-D Gravity Geometry Inversion of the Matheson Area, Abitibi greenstone belt: maintaining the contacts of one of the geological unit fixed for obtaining superior results
- Publication Name: AEGC 2021
- Authors: Fabiano Della Justina
- Date Published: September 2021
Abstract:
Using measured density values and surface geology as constraints, and a compilation of two data sets of ground gravity as observed data, 3-D inversions using the VPmg algorithm were used to estimate the subsurface model in the Matheson area, which is...
Geology of the shear zone hosted Dugald River Zn-Pb-Ag deposit, Mt Isa Inlier, NW QLD
- Publication Name: AEGC 2021
- Authors: Corey Jago, Pieter Creus, Shaun Neal
- Date Published: September 2021
Abstract:
Dugald River is a world-class deposit with a total Mineral Resource of 68 Mt @ 11.6 % Zn, 1.2 % Pb, and 26 g/t Ag. The deposit has experienced a protracted history of polyphasal folding, shearing, boudinage and brecciation with mineralisation governe...
Towards standard technical Deeds for (airborne) geophysical surveys in Australia
- Publication Name: AEGC 2021
- Authors: Yvette Poudjom Djomani, James Goodwin
- Date Published: September 2021
Abstract:
Geoscience Australia (GA) and its predecessors have been conducting geophysical surveys and processing geophysical data since the early 1950’s. Over time, GA’s role has changed from being a pioneer in the acquisition and processing of data to foc...
The Delamerian Orogen- An overview of the resistivity structure across scales
- Publication Name: AEGC 2021
- Authors: Kate Robertson, Tom Wise, Stacey Curtis, Alison Kirkby, Stephan Thiel, Jingming Duan, Graham Heinson
- Date Published: September 2021
Abstract:
Here we present 3D and 2D resistivity models of the lithosphere beneath an area of southeast Australia, derived from the Australian Lithospheric Architecture Magnetotelluric Project (AusLAMP) and a subsequent infill broadband MT transect collected in...
Maximising the value of high-definition 3D coal seismic data
- Publication Name: AEGC 2021
- Authors: Margarita Pavlova, Matt Grant, Tim Dean
- Date Published: September 2021
Abstract:
The acquisition of seismic data over coal mining leases in Queensland’s Bowen Basin first commenced over 30 years ago. Since then, coal seismic data has been predominantly utilised for structural interpretation, particularly fault delineation. In t...
Magnetic characterisation of the Osborne IOCG: magnetic fabrics, self-demagnetisation, and remanence: Cloncurry District, QLD
- Publication Name: AEGC 2021
- Authors: Andreas Bjork, Jim Austin, Helen McFarlane
- Date Published: September 2021
Abstract:
Integrated petrophysics linked with structural geology and mineralogy are powerful tools for mineral system characterisation. In this study, open-pit samples and drill core from the Osborne IOCG deposit were measured for anisotropy of magnetic suscep...
The resistivity structure of the Gidyea Suture and its relationship to the Carpentaria Conductivity Anomaly
- Publication Name: AEGC 2021
- Authors: Janelle Simpson, Dominic Brown, Karen Connors
- Date Published: September 2021
Abstract:
The Gidyea Suture is a structure that lies on the eastern margin of the Mount Isa Province. It was first recognised in deep crustal seismic, and subsequent authors have used magnetotelluric (MT) data to further support its existence. It is considered...
Continental shelf marine MT feasibility study in the Spencer Gulf, South Australia
- Publication Name: AEGC 2021
- Authors: Graham Heinson, Kate Robertson, Goran Boren, Steven Constable, Jacob Perez, Stephan Thiel, Jingming Duan, Darren Kyi
- Date Published: September 2021
Abstract:
Data from 12 new marine magnetotelluric (MT) stations have been acquired on the ocean-bottom of the Spencer Gulf, extending the land MT profile that crosses the Eyre Peninsula. The primary goal of the project was to determine the feasibility of colle...
Gaining value from historical AEM data
- Publication Name: AEGC 2021
- Authors: Shane Mulè, Tim Munday
- Date Published: September 2021
Abstract:
Australia is covered with a significant number of AEM surveys, primarily acquired over the last three decades. Most of these data were collected with now obsolete systems or system variants. Unfortunately, many of these historical datasets contain un...
Predicting fluid pathways in large discontinuity systems using graph theory
- Publication Name: AEGC 2021
- Authors: Ulrich Kelka Stefan Westerlund Thomas Poulet Luk Peeters
- Date Published: September 2021
Abstract:
Fracture networks and fault zones play an important role for subsurface fluid flow. Estimating the impact on the permeability field of such structures is of high interest for reservoir characterization, groundwater management, and exploration targeti...
A new era for the Australian National Gravity Grids – adding airborne data to the mix
- Publication Name: AEGC 2021
- Authors: Richard Lane, Yvette Poudjom Djomani, Phillip Wynne
- Date Published: September 2021
Abstract:
Since 1976, Geoscience Australia has produced grids of gravity anomalies to support geological mapping and exploration applications across Australia. The five editions of the national grids up to 2016 have been based on ground gravity observations, s...
Lithospheric resistivity structures and mineral prospectivity from AusLAMP data in northern Australia
- Publication Name: AEGC 2021
- Authors: Jingming Duan, Darren Kyi, Wenping Jiang, Michael Doublier, Alison Kirkby
- Date Published: September 2021
Abstract:
Magnetotelluric (MT) data allow geoscientists to investigate the link between mineralisation and lithospheric-scale features and processes. In particular, the highly conductive structures imaged by MT data appear to map the pathways of large-scale pa...
Diagenetic controls on the reservoir quality of organic-rich shales of the Mesoproterozoic Velkerri Formation (Beetaloo Basin)
- Publication Name: AEGC 2021
- Authors: Claudio Delle Piane, Colin MacRae, William Rickard, Vincent Crombez, Mohinudeen Faiz, David N. Dewhurst
- Date Published: September 2021
Abstract:
This contribution focuses on the organic rich intervals of the prospective Mesoproterozoic Velkerri Formation from the Beetaloo Sub-basin, part of the greater McArthur Basin (Northern Territory). It is based on the integration of petrophysical measur...
Deciphering the building blocks of the eastern North Australia Craton
- Publication Name: AEGC 2021
- Authors: Karen Connors, Janelle Simpson, Dominic Brown
- Date Published: September 2021
Abstract:
Interpretation of the nature and extent of basement rocks in many regions is hampered by lack of exposure and because potential field data tend to reflect the signatures of overlying upper crustal units, highlighting the need for tools that image dee...
The Do-It-Yourself Geophysicist
- Publication Name: AEGC 2021
- Authors: Anton Kepic
- Date Published: September 2021
Abstract:
The proliferation of open software and hardware, such as Micropython and other GNU-based licensing of generic embedded computing platforms provides largely readymade data acquisition and data fusion platforms that allow many geophysicists to make the...
An inventory of peralkaline rocks in Queensland for evaluation of REE enrichment potential
- Publication Name: AEGC 2021
- Authors: David Purdy, Bob Bultitude, Dominic Brown
- Date Published: September 2021
Abstract:
Highly fractionated peralkaline rocks are globally important sources of rare earth elements and other critical or new economy metals. Such metals are vital for technological advancement and a transition to a clean energy future and are therefore pred...
How deep does ground EM see?
- Publication Name: AEGC 2021
- Authors: Andrew Fitzpatrick, Mike Whitford, Antonio Huizi
- Date Published: September 2021
Abstract:
Nickel exploration routinely utilises electromagnetic techniques as a direct detection tool. In the Australian context, conductive regolith dominated terrains reduces the depth of penetration of electromagnetic techniques. Modelling is typically perf...
Practical aspects of wavefield decomposition for permanent seismic rotatory sources
- Publication Name: AEGC 2021
- Authors: Roman Isaenkov, Sinem Yavuz, Roman Pevzner, Konstantin Tertyshnikov, Julia Correa, Barry Freifeld
- Date Published: September 2021
Abstract:
Continuous reservoir surveillance requires permanent seismic sources. One such source is a seismic orbital vibrator (SOV). An SOV excites a circularly polarised seismic signal by the rotation of an eccentric mass alternately clockwise and counter-clo...
Estimate elastic moduli of arenites from micro-tomographic images with digital rock physics
- Publication Name: AEGC 2021
- Authors: Jiabin Liang, Boris Gurevich, Maxim Lebedev, Stephanie Vialle, Alexey Yurikov, Stanislav Glubokovskikh
- Date Published: September 2021
Abstract:
Numerical computation from high resolution 3D microtomographic (micro-CT) images of rocks (known as digital rock physics) has the potential to predict elastic properties more accurately. However, successful examples are limited to samples with simple...
Targeting Fractured Rock Aquifers using Magnetic Data
- Publication Name: AEGC 2021
- Authors: Heather Ballantyne, Karen Gilgallon, Sharon Lowe
- Date Published: September 2021
Abstract:
Fractured Rock Aquifers are an important source of water with approximately 40% of groundwater in Australia present in fractured rock. The water extracted from fractured rock aquifers is utilised in mining, irrigation, town water supply and stock wat...
Laboratory measurements of seismic properties and forward seismic modelling at the Thunderbox gold mine, in Western Australia
- Publication Name: AEGC 2021
- Authors: Andre Eduardo C. M. Souza, Stephanie Vialle, Joel Sarout, Mustafa Sari
- Date Published: September 2021
Abstract:
Laboratory measurements on 126 samples and forward seismic modelling over a 2D geologic representation of the Thunderbox gold mine, in Western Australia, were conducted to investigate the seismic response of the gold-hosting rocks and structures at t...
Enhancing interpretation of geophysical models using petrophysical logging
- Publication Name: AEGC 2021
- Authors: Cericia Martinez, Shane Mulè, Teagan Blaikie, Jelena Markov
- Date Published: September 2021
Abstract:
Direct petrophysical measurements, such as density and magnetic susceptibility, may prove useful in improving the interpretability of geophysical models. With measurements becoming more abundant and the capability to measure petrophysical properties ...
Curtin In-Situ GeoLab – advancing geophysical sensing
- Publication Name: AEGC 2021
- Authors: K. Tertyshnikov, S. Zulic, A. Yurikov, S. Yavuz, E. Sidenko, R. Isaenkov, R. Pevzner
- Date Published: September 2021
Abstract:
The Distributed Acoustic Sensing (DAS) is a novel approach in sensing which constantly increasing its presence in various geophysical applications. It is paramount to understand the measurements, their limitations and performance of the technology fo...
Comparative Hydrogeological Characterisation of the Springbok and Precipice Sandstones
- Publication Name: AEGC 2021
- Authors: O. Gaede, P. Asmussen, D. Murphy
- Date Published: September 2021
Abstract:
The Springbok Sandstone (Surat Basin, Australia) overlies the Walloon Subgroup, which is a significant target for Coal Seam Gas (CSG) production. In order to assess and mitigate possible groundwater impact of CSG production, it is critical to define ...
Subsurface characterisation using full waveform inversion of vertical seismic profile data: Example from the Curtin GeoLab well
- Publication Name: AEGC 2021
- Authors: S. Zulic, A. Bona, K. Tertyshnikov, A. Yurikov, R. Pevzner
- Date Published: September 2021
Abstract:
Full-waveform inversion (FWI) uses the complete seismic wavefield (transmitted, reflected and converted waves) to build the models of subsurface physical properties. We conducted a feasibility study of a 2D elastic FWI applied to the synthetic and fi...
Magnetic inversion constrained by probabilistic magnetotellurics models: methodology and application
- Publication Name: AEGC 2021
- Authors: J. Giraud, H. Seillé, V. Ogarko, G. Visser, M. Lindsay, M. Jessell
- Date Published: September 2021
Abstract:
We introduce a sequential inversion workflow where we integrate magnetotelluric and magnetic data. We first perform probabilistic MT inversions, from which we derive 2D or 3D probabilities of observing an interface between rock units of contrasting e...
Microbial methane production in the Surat Basin, Queensland
- Publication Name: AEGC 2021
- Authors: B.C. Campbell, Se Gong, P. Greenfield, D.J. Midgley, I.T. Paulsen, S.C. George
- Date Published: September 2021
Abstract:
A large proportion of the methane found in coal seams is produced by microbial communities. Despite coal seam methane being a valuable resource for human energy security, the processes employed by these microbes in the production of methane are still...