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Almost automatic geological mapping from AEM surveys
- Publication Name: AEGC 2021
- Authors: David Annetts, Juerg Hauser
- Date Published: September 2021
Abstract:
Interpretation of electromagnetic survey data for underlying geology is a common task that is complicated by the volume of data collected in airborne electromagnetic (AEM) surveys. We test a supervised learning approach for AEM data collected in the ...
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. ...
Yaouré Seismic Survey: Defining a Complex 3D Structural Framework with High Resolution Seismic Data
- Publication Name: AEGC 2021
- Authors: Greg Turner, Cissé Amadou, Peter Turner, Graeme Hird, Doug Jones
- Date Published: September 2021
Abstract:
Approximately 4Moz of gold have been discovered to date at the Yaouré gold deposit in Côte d’Ivoire, demonstrating the high endowment of the area despite little exploration at depths beyond 350m. With the objective of accelerating its search for ...
Inversion-based automatic processing of AEM data
- Publication Name: AECG 2021
- Authors: Gianluca Fiandaca
- Date Published: September 2021
Abstract:
Data processing is a mandatory step before inversion for any geophysical inversion, because data outliers significantly affect the inversion process, often forbidding to reach reasonable inversion models and misfits. In the processing of Airborne Ele...
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...
Australian geomagnetic observatory network monitors space weather hazard – 180 years on
- Publication Name: AEGC 2021
- Authors: Liejun Wang, Andrew Lewis, Bill Jones, et al.
- Date Published: September 2021
Abstract:
Geoscience Australia’s geomagnetic observatory network covers one-eighth of the Earth. The first Australian geomagnetic observatory was established in 1840 in Hobart. This almost continuous 180-year period of magnetic-field monitoring provides an i...
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...
If you can’t go to the Anomaly then let the Anomaly come to you – Rubens Cage Surveys
- Publication Name: AEGC 2021
- Authors: Clive Foss, Keith Leslie, Phil Schmidt
- Date Published: September 2021
Abstract:
We use small-scale surveys in a three-axis, uniform field generating coil set (a Rubens cage) to emulate the Black Hill Norite magnetic field anomaly in South Australia. We then run further surveys with the source rotated to provide a vertical magnet...
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 ...
Exploring for gold using radiometrics, magnetics, and petrophysical information in the Warrawoona greenstones of the East Pilbara, Western Australia
- Publication Name: AEGC 2021
- Authors: Yvonne Wallace, Heather Ballantyne, Steve Sheppard
- Date Published: September 2021
Abstract:
The Warrawoona Gold Project is located 25 kilometres southeast of Marble Bar in the East Pilbara region of Western Australia. Key prospects include the Klondyke deposit, which forms the main share of the 1.25 Moz gold resource owned by Calidus Resour...
Optimising Land Seismic Acquisition for Modern Noise Suppression in Processing
- Publication Name: AEGC 2021
- Authors: Graeme Eastwood, Christof Stork
- Date Published: September 2021
Abstract:
Land seismic data is known to be far noisier than its marine equivalent – the questions we want to begin to address are why and is there anything that can be done about it? Noise issues with land data are often just explained by ‘poor coupling’...
Multi-scale magnetotelluric surveys – mapping from the lithosphere to the near surface for mineral systems
- Publication Name: AEGC 2021
- Authors: Wenping Jiang, Jingming Duan, Anthony Schofield, Ross C. Brodie, Andrew Clark
- Date Published: September 2021
Abstract:
Geoscience Australia has undertaken a series of integrated studies to map the footprint of mineral systems at multiple scales. We have used long-period data from the Australian Lithospheric Architecture Magnetotelluric Project (AusLAMP) to resolve la...
PERMEABILITY MODELLING USING DIGITAL ROCK IMAGES FROM MICRON SCALE
- Publication Name: AEGC 2021
- Authors: Lionel Esteban, Mojtaba Seyyedi, White Cameron, Giwelli Ausama, Valeriya Shulakova, Marina Pervukhina, Sam Jackson, Joel Sarout, Amir Aryana, Yoshitake Kato, Mai Shimokawara, Ryuta Kitamura, Fei Jiang, Takeshi Tsuji, Tatsunori Ikeda, Maxim Lebedev
- Date Published: September 2021
Abstract:
Recent technology improvements allow gaining a digital 3D replica of natural rock using fast and non-destructive tomographic techniques. Combining core-scale images from medical X-Ray with micron resolution images from micro CT scanners, natural rock...
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...
Rock Property and Depth Mapping from magnetic data applied to greenfields exploration targeting in the Cloncurry District
- Publication Name: AEGC 2021
- Authors: David Pratt, James Austin, Clive Foss
- Date Published: September 2021
Abstract:
A new method for building a model of the rock property distribution on an unconformity surface (Pratt et al., 2019) presents new opportunities for greenfield exploration in complex geological environments. The method uses the inherent 3D information ...
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 new method for determining drill-bit signal emission time
- Publication Name: AEGC 2021
- Authors: Zixing Qin, Milovan Urosevic, Andrej Bona, Roman Pevzner, Konstantin Tertyshnikov
- Date Published: September 2021
Abstract:
In 2019, the first ever Seismic While Drilling (SWD) dataset recorded by Distributed Acoustic Sensing (DAS) fibre optic cable was acquired at the Otway Carbon Capture and Storage (CCS) site. After analysing the recorded signal, a new technique named ...
Inversion of Airborne IP data with a multi-mesh approach for parameter definition
- Publication Name: AEGC 2021
- Authors: Gianluca Fiandaca, Andrea Viezzol
- Date Published: September 2021
Abstract:
The interest on Induced Polarization in AEM data (AIP) has significantly increased in recent years, both within the research community and in the industry. However, the inversion of AIP data is particularly ill-posed, especially when spectral modelli...
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...
Transformative geophysics: Alternatives to the reduction-to-pole transformation of magnetic data
- Publication Name: AEGC 2021
- Authors: Richard Smith
- Date Published: September 2021
Abstract:
Magnetic data is difficult to interpret due to the bipolar nature of the field and the fact that the amplitude and phase of the response varies depending on the inclination of the Earth’s field and the dip of magnetic bodies. The reduction to the p...
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...
Airborne geophysical surveys uploaded to SARIG in 2020: Industry focus
- Publication Name: AEGC 2021
- Authors: Philip Heath
- Date Published: September 2021
Abstract:
The Covid-19 pandemic has given the geophysicists at the Geological Survey of South Australia the opportunity to revisit historical geophysical data that had not yet been uploaded onto the South Australian geoserver web portal: SARIG (South Australia...
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...
Case Study from N.W. Carnarvon using WEB-AVO Inversion to Map Low Saturation Gas & Unravel Geology Using “Noisy” Seismic
- Publication Name: AEGC 2021
- Authors: John Coffin, Angie Kelsay, Shahid Ur Rehman
- Date Published: September 2021
Abstract:
This case study applies the next generation of seismic AVO inversion technology to a project in the NW Carnarvon Basin offshore Western Australia. The technology is called WEB-AVO (Wave Equation Based – AVO Inversion) and no longer considers the ea...
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...
Compositional control on frictional properties of Goldwyer shale reservoir rocks
- Publication Name: AEGC 2021
- Authors: Partha Pratim Mandal, Reza Rezaee, Mustafa Sari, Joel Sarout
- Date Published: September 2021
Abstract:
Production from ultra-low permeable gas shale reservoirs is feasible only through hydraulic fracturing stimulation. Slip along a pre-existing natural network of fractures/faults with the injection of hydraulic fluid is mostly controlled by the fricti...
Robust 3D models of geochemical and petrophysical properties from combining borehole and seismic reflection data: A case study from the Tropicana Gold Mine
- Publication Name: AEGC 2021
- Authors: Duy Thong Kieu, Anton Kepic, Jai Kinkela, Ockert Terblanche, Stephen Brown
- Date Published: September 2021
Abstract:
The creation of 3D models of ore zones and geotechnical properties is typically performed by the interpolation of borehole data. Kriging and other interpolation methods have serious sampling issues, including bias from borehole orientation. Interpola...
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...
Groundwater and gas sampling informing hydrogeological conceptualisation of the Precipice and Hutton Sandstone aquifers of the southern Surat Basin
- Publication Name: AEGC 2021
- Authors: J. K. Pearce, H. Hofmann, K. Baublys, et al.
- Date Published: September 2021
Abstract:
The southern Surat Basin in Queensland, Australia, may be a prospective region for geological storage of CO2 within the Precipice Sandstone with the Evergreen Formation acting as a sealing cap-rock of the reservoir. The Hutton Sandstone, a major regi...
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 ...