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Application of audio-magnetotelluric method to cover thickness estimation for drill site targeting
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Wenping Jiang*, Ross Brodie, Jingming Duan
- Date Published: September 2019
Abstract:
Cover thickness estimation is critical to mineral exploration effectiveness in covered terrains. Geophysical methods are able to detect physical properties contrasts in different earth materials without seeing them. We present the application of the ...
Palaeogeographic evolution of the Triassic succession, central North West Shelf
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Steve Abbott*, Claire Orlov, George Bernardel, Nadege Rollet, Duy Nguyen, Merrie-Ellen Gunning, Chris Nicholson
- Date Published: September 2019
Abstract:
Triassic deposition on the central North West Shelf (CNWS) mainly took place in a large depocentre comprising the Beagle Sub-basin and the Exmouth Plateau, and a small depocentre located within the Rowley Sub-basin. Thermal subsidence prevailed but s...
The sample boundary effect in the low-frequency measurements of the elastic moduli of rocks
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Wenhui Tan, Vassily Mikhaltsevitch*, Maxim Lebedev, Stanislav Glubokovskikh, Boris Gurevich
- Date Published: September 2019
Abstract:
In this study we examine the effect of the boundary conditions on the laboratory measurements of the elastic properties of a fluid-saturated sedimentary rock at low frequencies. In laboratory experiments associated with studying fluid effects on elas...
Regional Stratal Slice Imaging of the Northern Carnarvon Basin, Western Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Tony Marsh, Anne Powell
- Date Published: September 2019
Abstract:
Chevron has developed a method for merging, viewing, and interpreting multiple 3D seismic surveys in stratal slice domain. The products of this method are referred to as Regional Stratal Slice Volumes (RSSVs). Within the Northern Carnarvon Basin (NCB...
Driving the paradigm shift of near surface exploration geochemistry using ultrafine soils
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Ryan Noble, Ian Lau, Tenten Pinchand, Ravi Anand, Paul Morris
- Date Published: September 2019
Abstract:
Soils are widely used as a geochemical sample medium. These samples are sieved to <250 µm or <180 µm to remove larger gravels and coarse sand and later pulverized for analysis, but no other refinement is commonly used. Why is this the case? In tran...
Petrophysical “Big Data” – case study from the Stavely Project, western Victoria
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Phil Skladzien
- Date Published: September 2019
Abstract:
The application of recent technological advances to the acquisition of petrophysical datasets has significantly increased the amount of quality, systematic physical rock property measurements that can be captured efficiently and cost effectively. The...
Imaging a mafic underplate in 3D: an example from the east Albany–Fraser Orogen and Yilgarn Craton margin
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Lucy Brisbout*, Ruth Murdie
- Date Published: September 2019
Abstract:
In this study a mafic underplate along the margin of the Proterozoic east Albany–Fraser Orogen and Archean Yilgarn Craton is imaged using 3D gravity forward modelling. The 3D model was constructed in GeoModeller and tested by 3D gravity forward mod...
Application of passive seismic and AEM to 3D paleochannel imaging: Capricorn Orogen
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Sara Jakica, Lucy Brisbout
- Date Published: September 2019
Abstract:
This study uses shallow passive seismic HVSR (horizontal-to-vertical spectral ratio) technique to determine the depth and extent of a Cenozoic paleochannel composed dominantly of sand and clay incised into the Proterozoic granitic basement of the Cap...
Nova-Bollinger Ni-Cu sulfide ore deposits, Fraser Zone, Western Australia: Petrology of the host intrusions sulfide-silicate textures and emplacement mechanisms of the ores
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Valentina Taranovic*, Stephen J. Barnes, Steve Beresford, John Miller*, Steven Rennick
- Date Published: September 2019
Abstract:
The Nova-Bollinger Ni-Cu sulfide ore deposits are hosted within a suite of mafic-ultramafic intrusive cumulate bodies. The Lower Intrusion is a thin semi-conformable chonolith comprising unlayered mafic to ultramafic orthocumulates, hosting the bulk ...
Internal architectural analysis of mass transport deposits to unravel deepwater dispersal fairways; a novel approach to an old challenge
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Roland Dashti*, Benjamin Birt, Masoud Jangani
- Date Published: September 2019
Abstract:
High resolution borehole images were used to study the internal architecture of mass transport deposits (MTD units) in a well drilled in offshore deepwater Borneo. The main objective was to utilize information from bedding orientations within MTDs to...
A series of confusing measurements in the search for water
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Chris Wijns
- Date Published: September 2019
Abstract:
A mine development in the high Andes of north-western Argentina requires a supply of fresh water for various uses, the largest being mineral processing. Complementary survey techniques in a gravel basin have provided vastly different and sometimes co...
PhotonAssay™ – Efficient & bulk gold analysis in the modern world
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Chenoa Tremblay*, Gary Wheeler, Anthony Oteri
- Date Published: September 2019
Abstract:
The PhotonAssayTM Max is an instrument utilising high-energy X-rays but reimaged for the modern world with full robotics and ability to keep up with the high demands of mining. Since Pierre Gy’s introduction of sampling theory into the g...
Electromagnetic and electrical methods applied to mapping coked coal – A case study from the Bowen Basin, Eastern Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Jonathan Lowe*, James Reid, Eric Battig, Scott Napier, Dan Eremenco
- Date Published: September 2019
Abstract:
In coal mining it is important to know if localised areas of coal have been rendered worthless through direct contact with volcanic intrusions. To avoid dilution, accurate coked coal boundaries are traditionally mapped by drilling....
Imaging challenges at Gulf of Papua (PNG) and their solutions through high-end imaging technology
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Zongying Gong*, Subhash Chandra, Xiaodong Wu, Yajing Li, Min Zhi, Michael Szczepaniak, Barry Hung
- Date Published: September 2019
Abstract:
Recently, there has been increasing interest in exploration of the Gulf of Papua (GoP), part of the Papuan Basin. This Basin has undergone a complicated structural and stratigraphic evolution related to its position on the northeastern edge of the Au...
The road to Dorado: factors leading to a play-opening hydrocarbon discovery
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Fred Wehr
- Date Published: September 2019
Abstract:
This presentation describes the events leading up to the Dorado oil discovery made by Quadrant Energy and Carnarvon Petroleum in late 2018. ...
Smart stitching: adding lateral priors to ensemble inversions as a post-processing step
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Gerhard Visser*
- Date Published: September 2019
Abstract:
The last decade has seen extensive development of Bayesian geophysical inversion methods which produce ensembles of models as outputs. Many of these are limited to producing 1D or very simple and narrow models. It is well established that tying such ...
Drillhole rugosity correction for gamma-gamma density tools – A space modelling approach
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Dragos Gavriliu, James Batchelor
- Date Published: September 2019
Abstract:
This paper describes a novel approach to solving borehole rugosity for single detector gamma-gamma density logging. Modelling the space investigated by the gammagamma density tool provides the basis for deriving an applied rugosity correction....
Resolving complex velocity and gas absorption features with full-waveform inversion in the Taranaki Basin, New Zealand
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Yuelian Gong*, Dominic Fell, Robert Hunn, Richard Bisley, Alexander Karvelas, Bee Jik Lim
- Date Published: September 2019
Abstract:
The Western Platform multiclient survey is in the Taranaki Basin, offshore New Zealand. Legacy imaging efforts have suffered due to being unable to overcome the presence of multiple geological challenges. A complex shallow overburden across the surve...
Making EM systems and bore logs speak the same language
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Aaron Davis*, Juerg Hauser
- Date Published: September 2019
Abstract:
Borehole induction logs, together with lithology records, are valuable for inferring geological and geophysical features in the subsurface. They offer insight into the relationship between geology and geophysics, and are an important source of inform...
Integrating seismic inversion in static models to capture geological heterogeneity and improve exploration outcomes
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Cristina Angheluta*, Megan Slade, Bonnie Henderson, David Kulikowski
- Date Published: September 2019
Abstract:
As an industry we have a poor track record of estimating prospect volume distributions and we tend to overpredict the pre-drill volumes, with most discoveries resulting in the pre-drill P90 volumes or less (Figure 1). To achieve improved prediction t...
Mapping IOCG-related alteration using 3D gravity and magnetic inversion: an example from the Tennant Creek – Mount Isa region, northern Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: James A. Goodwin*, Roger G. Skirrow
- Date Published: September 2019
Abstract:
To support the Exploring for the Future (EFTF) initiative, identification of possible hydrothermal alteration systems associated with iron oxide copper-gold (IOCG) deposits has been carried out in the Tennant Creek–Mount Isa region of northern Aust...
Strategic electromagnetic geophysical prospecting across a belt – an example over the Albany Fraser Orogen
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Andrew Fitzpatrick*, Mike Whitford
- Date Published: September 2019
Abstract:
Nickel exploration routinely utilises electromagnetic (EM) techniques as a direct detection tool. Independence Group is currently exploring a large tenement holding in the Albany Fraser Orogen in Western Australia that contains its flagship Nova magm...
Sub-basin architecture of the Proterozoic McArthur Group, southern McArthur Basin
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Teagan Blaikie*, Marcus Kunzmann
- Date Published: September 2019
Abstract:
The Proterozoic McArthur Basin, located in the north-east Northern Territory, preserves several large sediment hosted Zn-Pb-Ag mineral deposits. These deposits are hosted within sub-basins that developed during deposition of the McArthur Group. Geoph...
Facies classification with different machine learning algorithm – An efficient artificial intelligence technique for improved classification
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Partha Pratim Mandal, Reza Rezaee
- Date Published: September 2019
Abstract:
Accurate and precise identification of lithological facies is vital to understand geological variation in a proven reservoir. Four specific different machine learning (ML) classification algorithms are implemented to predict facies on an open dataset...
Characterising lithium host minerals within the lateritic duricrust, Greenbushes, Western Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Sophie Vuleta*, Monica LeGras, Raymond E. Smith, Carsten Laukamp, Louise Schoneveld, Ravi Anand
- Date Published: September 2019
Abstract:
Whilst detailed geochemical analyses have been conducted to mitigate the complications regolith cover poses to modern exploration efforts, less attention has been directed to the mineralogical associations that exist between lateritic residuum and po...
Overly steep decays in airborne TEM data and their link to chargeability: example from the Howards East District, NT, Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Klara Steklova*, Ken Lawrie, Esben Auken, Anders V. Christiansen, Gianluca Fiandaca
- Date Published: September 2019
Abstract:
The induced polarization (IP) response in airborne electromagnetic data has recently received attention due to its potential significance for mineral exploration and environmental applications, while also holding the prospect of improved geophysical ...
Geological investigations with high spatial resolution WV-3 satellite imagery and regional geophysics at the Haib Cu porphyry, Namibia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: R.D. Hewson*, E. Chinkaka, M. van der Meijde, B. Baugh, N. Titus, J.P. Mubita
- Date Published: September 2019
Abstract:
Recent improvements in available multi-spectral satellite-borne shortwave infrared sensors and their spatial resolution opens up the opportunity for furthering surface mineralogy mapping. Their image interpretation can be augmented with regional geop...
Efficient borehole targeting for ground-control of airborne electromagnetic (AEM) survey results
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Marcus Haynes, Yusen Ley-Cooper*
- Date Published: September 2019
Abstract:
AusAEM is a Geoscience Australia program to collect broad-spaced (~20 km) airborne electromagnetic (AEM) data at the regional scale. The AusAEM data is being used to map the thickness and character of sedimentary and regolith cover across northern Au...
Magnetic and gravity source models of the Gairdner Dolerites
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Philip Heath, Clive Foss
- Date Published: September 2019
Abstract:
The Gairdner Dolerites feature prominently in magnetic and gravity images of South Australia. They are a volcanic intrusive, easily identifiable in SA magnetic images as a set of NNW-SSE linear features. The Gawler Craton Airborne Survey (GCAS) has r...
Preliminary dating of martite goethite iron ore in the Hamersley Province (Western Australia)
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: E.R. Ramanaidou, M. Danišík, M.A. Wells
- Date Published: September 2019
Abstract:
In Western Australia, iron ore deposits are divided into three types, Channel Iron Deposits (CID), Detrital Iron Deposits (DID) and Bedded Iron Deposits (BID). The latter are hosted in the banded iron-formation (BIF) of the Marra Mamba and Brockman I...