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Deep neural networks for 1D impedance inversion
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Vladimir Puzyrev*, Anton Egorov, Anastasia Pirogova, Chris Elders, Claus Otto
- Date Published: September 2019
Abstract:
We investigate the applicability of different types of deep neural networks for the estimation of subsurface properties from seismic data. The pre-trained networks can predict velocity models from new data in a few milliseconds, which makes this data...
DAS seismic monitoring of the shallow CO2 controlled-release experiment at the South West Hub In-Situ Laboratory
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: K. Tertyshnikov*, R. Pevzner, B. Freifeld, L. Ricard, A. Avijegon
- Date Published: September 2019
Abstract:
Carbon Capture and Storage (CCS) remains one of the most viable short-term options for halting the increase in atmospheric concentration of greenhouse gases. Assurance of storage safety is an essential part of the process required to maintain a commu...
Century Zn deposit–the world’s largest meteorite impacted orebody
- Publication Name: Australasian Exploration Geoscience Conference
- Authors: Finbarr Murphy*, Terry Lees, Andrew Tomkins, Damian O’Donohue
- Date Published: September 2019
Abstract:
We describe how the world-class Proterozoic Century zinc deposit in northwest Queensland has been sculptured by an Ordovician meteorite impact, the Lawn Hill Impact Structure. The deposit is located at the SW edge of the crater, is dismembered by cra...
Artificial intelligence techniques to the interpretation of geophysical measurements
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Desmond FitzGerald*
- Date Published: September 2019
Abstract:
Integration of geology and geophysics thinking requires a common earth model, that accommodates, with errors, all the features from the geophysics interpretation products, topological rules from geology, field mapping and drill logs, and the link bet...
Colour amplifies relief shading
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Peter Kovesi
- Date Published: September 2019
Abstract:
Relief shading has long been recognised as being an effective way of presenting data. However, the interaction of relief shading and colour is perhaps not widely understood, and many software packages do not combine shading and colour in a physically...
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...
The Bight Basin, Evolution & Prospectivity I: gravity, deep seismic & basin morphology
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Jane Cunneen, Chanel DePledge, Sharon Lowe, Kevin Hill, Candice Godfrey, Amanda Buckingham, Rebecca Farrington
- Date Published: September 2019
Abstract:
Definition of the basement architecture within the Ceduna Sub-basin is poorly understood due to the depth of the basin and limited deep crustal geophysical datasets. This study uses seismic interpretation of BightSPAN™ deep crustal seismic lin...
Processing the first full azimuth OBN survey in Australia: a step change in imaging quality
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Unnikrishnan Chambath, Vincent Ganivet, Sergey Birdus, Joe Zhou, Alain Delorme, Leigh Scoby-Smith, Ivan Gregory, Matt Kovacevic, Tim Williams, Chris Walton
- Date Published: September 2019
Abstract:
Ocean Bottom Node (OBN) acquisition has been widely used in oil and gas industry to provide improved reservoir imaging when compared to conventional narrow azimuth (NAZ) towed streamer data. Its full azimuth (FAZ), high fold count, high repeatability...
Hyperspectral imaging of sedimentary iron ores – beyond borders
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Lionel C. Fonteneau*, Brigette Martini, Don Elsenheimer
- Date Published: September 2019
Abstract:
Banded iron formations (BIFs) and granular iron formations (GIFs) are the two primary types of sediment hosted iron ore deposits and provide the primary source for iron, globally. Although both deposit types are comprised of bedded chemical sediments...
Legacy data – hidden opportunity
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Keith Reeves*
- Date Published: September 2019
Abstract:
As oil prices have rebounded, operators look for new exploration opportunities. A new paradigm, however, is the increased focus on investor return rather than relentless expansion at all costs. This value-focused exploration looks for cost effective ...
DHEM at Las Cruces, Spain – successes and failures
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Gavin R. Selfe*
- Date Published: September 2019
Abstract:
Downhole electromagnetic (DHEM) logging was undertaken within four holes drilled at the Las Cruces VMS body in Spain. The geology of the deposit is geophysically complex inasmuch as the background and overlying geology is conductive. A number of loop...
Target detectability in regional-scale AEM surveys
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: David Annetts*, Juerg Hauser
- Date Published: September 2019
Abstract:
Direct detection of drillable targets is among the primary goals of airborne electromagnetic surveys. As larger government-funded regional surveys move towards large (> 5 km) line spacings, it is natural to question the likelihood of such s...
The geology of the Brecknock, Calliance and Torosa gas fields, Browse Basin, Western Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Robert Seggie, Simon Lang, Neil Marshall
- Date Published: September 2019
Abstract:
The Brecknock, Calliance and Torosa (BCT) gas fields are located offshore approximately 425 km north of Broome, Western Australia. The fields have undergone an extensive appraisal drilling and seismic acquisition campaign between 2005-2012, with the ...
Indicator minerals for magmatic sulfide mineralisation
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Louise Schoneveld*, Steve Barnes, Margaux LeVaillant, Valentina Taranovic
- Date Published: September 2019
Abstract:
Small conduit or chonolith style intrusions dominated by olivine- and pyroxene-rich cumulates are well known to be favourable hosts to magmatic Ni-Cu-(PGE) sulfide mineralization. In many cases, such mineralization is closely associated with partiall...
Collaborating on pre-competitive geophysical projects in the Northern Territory, Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Tania Dhu, Angus McCoy, Ian Scrimgeour
- Date Published: September 2019
Abstract:
This paper reviews three different collaborative approaches that have been applied to acquire pre-competitive geophysical data in the Northern Territory. The collaborative structures involve the resource exploration industry, Northern Territory Geolo...
A high-resolution seismic investigation for shallow iron ore
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Ashley Grant*, Sasha Ziramov, Milovan Urosevic
- Date Published: September 2019
Abstract:
A high-resolution shallow seismic investigation involving a 3D-3C, 3D-1C, 19 zero-offset ZVSP and a 3D SWD was undertaken in an effort to image a subsurface iron ore deposit. The same project area was used in all of the surveys and was located in nor...
The effects of seismic anisotropy on mining seismology
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Andrew King
- Date Published: September 2019
Abstract:
Microseismics – the detection and characterisation of mining-induced fracture events in the rockmass – is widely used to improve geotechnical understanding of the rockmass response to mining, and for hazard assessment of rockbursts and roof falls...
Metasomatic/depletion events affecting Cratons and “cratons”
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Tom Wise*, Stephan Thiel, Rian Dutch, Mark Pawley, Kate Robertson
- Date Published: September 2019
Abstract:
We integrate seismic tomographic models and filtered gravity anomaly maps to investigate the compositional variations in the SCLM of Australia. We find zones of relative enrichment and depletion coinciding with the spatial extent of major thermal eve...
Augmenting 1D conductivity depth sections to include information pertaining to 2D/3D conductors
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Magdel Combrinck*
- Date Published: September 2019
Abstract:
Conductivity depth data presentations derived using 1D approximations have become a very popular way to present airborne electromagnetic (AEM) data. While data profiles and a single error limit per station can accompany these presentations there are ...
The power of the crowd and open data – learnings from the OZ Minerals Explorer open innovation challenge
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Holly Bridgwater*, Jess Robertson, Ian Anderson
- Date Published: September 2019
Abstract:
We report on the results and lessons learned from Australia’s largest minerals exploration crowdsourcing challenge - the OZ Minerals Explorer Challenge. We discuss some of the challenges in running an international competition with a large amount o...
Utilising potential field modelling to better inform on the 3D structural architecture in regions of excellent structural control
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Robin Armit*, Teagan Blaikie, Peter Betts, Laurent Ailleres
- Date Published: September 2019
Abstract:
Information in the third dimension is intrinsic to potentialfield data. Potential-field interpretations and modelling can provide crucial regional and sub-surface geological constraints in areas considered to be structurally ‘well’ understood. T...
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...
Structural Setting and Controls on Ni-Cu Sulphide Mineralisation at Nova-Bollinger, Fraser Zone, WA
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Jonathan Standing
- Date Published: September 2019
Abstract:
Nova-Bollinger is a structurally modified magmatic Ni-Cu sulphide deposit in which sulphide melt was mechanically extracted from chonolithic intrusions and concentrated into structurally controlled positions within the footwall country rocks. The fer...
The Foura Sandstone type section (Samaropollenites speciosus Zone, Carnian–early Norian; early Late Triassic), Timor-Leste: preliminary correlation between Timor and the Bonaparte Basin
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: D. Peyrot, M. Keep, J. Scibiorski, E. McCartain, P. Baillie, J. Soares, D.W. Haig, A.J. Mory
- Date Published: September 2019
Abstract:
The logging and biostratigraphic characterization of the Foura Sandstone type section, Timor-Leste, show it is Carnian–early Norian (Samaropollenites speciosus Zone). Sedimentary structures indicate a turbidite origin and petrographic analysis reve...
Subsurface characterisation for future CCS applications using uncommon 3D surface and borehole seismic survey geometries at Harvey, Western Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Milovan Urosevic, Sasha Ziramov*, Roman Pevzner, Konstantin Tertyshnikov, Sinem Yavuz, Anton Egorov, Andrej Bona, Valeriya Shulakova, Dominique Van Gent
- Date Published: September 2019
Abstract:
Within the South West Hub Project we conducted a comprehensive integrated study to map the fault and fracture network surrounding the Harvey 3 well to obtain an understanding of their propensity to act as conduits for the injected CO2. Her...
What lies beneath? A reflection on the porphyry copper exploration model
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Ken E. Witherly*
- Date Published: September 2019
Abstract:
Electrical methods have been applied to the search for porphyry copper and IOCG deposits since the early 1950s. While there is a generally accepted model of disseminated sulfides giving rise to a chargeability response, no clear association has been ...
An AI approach to automated magnetic formation mapping beneath cover
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: David A. Pratt*, K. Blair McKenzie, Anthony S. White
- Date Published: September 2019
Abstract:
Most regional scale magnetic maps are dominated by the magnetic characteristics of steeply dipping basement units truncated by an unconformity surface. It is easy to demonstrate that 80 to 90% of each total field magnetic anomaly is contributed by th...
Gold metallogeny of the northern Capricorn Orogen
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Imogen Fielding, Simon Johnson
- Date Published: September 2019
Abstract:
The timing and distribution of gold mineralization in Proterozoic orogens is influenced by crustal architecture which is often established long before gold mineralization occurs. Gold occurrences in such settings are commonly associated with crustal-...
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...
Maximising value from seismic using new data and information management technologies
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Jess B. Kozman, Matthew Holsgrove
- Date Published: September 2019
Abstract:
Geophysical data is one of the key decision support factors for successful discovery of hydrocarbons, and operators have multi-decadal inventories of survey data in key basins. Woodside has a history of exploration in Australia from 1954 and seismic ...