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Seismic inversion by hybrid machine learning
- Publication Name: AEGC 2021
- Authors: Yuqing Chen, Erdinc Saygin
- Date Published: September 2021
Abstract:
Full waveform inversion (FWI) has been widely used for recovering a high-resolution subsurface structure from the entire content of measured seismic data. However, FWI requires a good starting model which needs to be close to the true model. If it is...
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...
Detailed geophysical mapping and 3D geological modelling to support urban planning: A case study of Ny Rosborg, Denmark
- Publication Name: AEGC 2021
- Authors: Theis R. Andersen, Søren E. Poulsen, Anna B. Medhus
- Date Published: September 2021
Abstract:
At present, urbanisation is taking place. As cities expand, areas previously omitted due to construction risks are now being urbanised. These areas are typically characterised as those with unforeseen soil properties, unknown groundwater conditions a...
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...
Inverting the head wave coefficient with the Werth equation
- Publication Name: AEGC 2021
- Authors: Derecke Palmer
- Date Published: September 2021
Abstract:
The head wave coefficient, the refraction analogue of the reflection coefficient, is a complex function of the densities and the P- and S-wave velocities in both the weathered and sub-weathered regions. In general, the head wave coefficient increases...
Complex recharge mechanisms creating contradictory tracer signals in a large karst aquifer in northern Australia elucidated by a multi-tracer study
- Publication Name: AEGC 2021
- Authors: Axel Suckow, Alec Deslandes, Christoph Gerber, Cornelia Wilske, Sebastien Lamontagne, Yang Guo-Min, Jiang Wei
- Date Published: September 2021
Abstract:
The up to 300m thick Cambrian Limestone Aquifer in northern Australia extends over different climatic zones from the dry savanna to the tropics and is karstified. This hydrologically challenging system was studied using multiple environmental tracer ...
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 ...
Multi-purpose utility of constructing 3D static Geomechanical model in the Ichthys field, Browse Basin
- Publication Name: AEGC 2021
- Authors: Partha Pratim Mandal, Iman Essa, Sankhajit Saha, Reza Rezaee
- Date Published: September 2021
Abstract:
The petroleum industry progressed significantly to develop 3D/4D geomechanical models (GMs) to make efficient field development planning which reduces the uncertainty of 1D GM in the field scale. In this paper, we demonstrated how to build a high-res...
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...
The present-day state of tectonic stress in eastern Australia
- Publication Name: AEGC 2021
- Authors: Mojtaba Rajabi
- Date Published: September 2021
Abstract:
Knowledge of the present-day stress is important to understand the dynamics of earthquakes, and to manage the safe and sustainable usage of the underground during storage and exploitation. Eastern Australia hosts several sedimentary basins with large...
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...
Integrated modelling of seismic velocities and impact on prospect evaluation
- Publication Name: AEGC 2021
- Authors: Jarrod Dunne, James Parsons
- Date Published: September 2021
Abstract:
It is often assumed that velocities associated with good quality seismic images can be directly used for time-to-depth conversion, pore-pressure prediction or even as a driver for seismic amplitude interpretation. However, such applications require s...
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...
Using the NCI Gadi Supercomputer to revolutionise processing of MT time series data: results from the GeoDeVL experiment
- Publication Name: AEGC 2021
- Authors: Nigel Rees, Sheng Wang, Ben Evans, et al.
- Date Published: September 2021
Abstract:
MagnetoTelluric (MT) time series datasets are expensive to acquire, can be high volume (100s of terabytes), and the time taken to publish (measured from collection to release) often takes more than two years. Time series datasets have been notoriousl...
AusArray: uncovering major crustal features using passive seismic data
- Publication Name: AEGC 2021
- Authors: Alexei Gorbatov, Andrew Medlin, Michael P. Doublier, Karol Czarnota, Tanya Fomin, Paul Henson, Brian L.N. Kennett
- Date Published: September 2021
Abstract:
It is generally accepted that improvements in mineral exploration are required to meet the rising demand for minerals associated with a transition to lower carbon energy sources. There is growing consensus in mineral exploration that the distribution...
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...
Application of LiDAR for hydrocarbon exploration in logistically and geologically challenging environments: examples from the Papuan Fold and Thrust Belt, Papua New Guinea
- Publication Name: AEGC 2021
- Authors: Luke Mahoney, Mitch Furnass, Pedro Restrepo-Pace
- Date Published: September 2021
Abstract:
The Papuan Fold and Thrust Belt (PFTB) in Papua New Guinea hosts the prolific Papuan Basin petroleum system yet remains underexplored compared with other fold and thrust belts worldwide. The underexplored nature of the PFTB results from its remotenes...
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 ...
Full waveform refraction imaging of the regolith with the CIG stack
- Publication Name: AEGC 2021
- Authors: Derecke Palmer
- Date Published: September 2021
Abstract:
Full waveform refraction imaging with the common intercept gather (CIG) is a simple application of the stacking procedures routinely employed with seismic reflection data processing to the standard intercept time method. Accordingly, the stacked full...
Post-rift magmatism on the continental shelf of the Otway Basin and implications for the igneous plumbing systems in sedimentary basins
- Publication Name: AEGC 2021
- Authors: Yakufu Niyazi, Mark Warne, Daniel Ierodiaconou
- Date Published: September 2021
Abstract:
Various types of igneous rocks have been frequently encountered during hydrocarbon exploration of sedimentary basins along rifted passive margins, and their impacts on hydrocarbon maturation and migration processes are diverse. Buried volcanoes gener...
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...
Gravimetric measurements of high pressure and temperature C1, C2 and C3 adsorption isotherms on Beetaloo Sub-basin shales
- Publication Name: AEGC 2021
- Authors: Nicholas Lupton, Michael Camilleri, Mohinudeen Faiz
- Date Published: September 2021
Abstract:
Exploration in Australia’s Beetaloo Sub-basin focuses on the liquids, wet-gas, and dry-gas mature shales of the Kyalla and Velkerri formations. Gas storage in these reservoirs occurs as free gas and additionally through adsorption to the internal p...
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...
Application of Facies Based Seismic Inversion in Developing Shallow Gas Fields in Cooper-Eromanga Basin
- Publication Name: AEGC 2021
- Authors: Satyabrata Mishra, Shane Squire, Thomas Massey
- Date Published: September 2021
Abstract:
This paper presents a case-study of the application of facies-based seismic inversion in the Cooper-Eromanga Basin, South Australia. The technique has been used to support the development of shallow gas fields in the Cretaceous reservoirs of the Coor...
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...
Examples of integrating hyperspectral, geochemical and petrophysical drill core data using Australia’s National Virtual Core Library infrastructure
- Publication Name: AEGC 2021
- Authors: Carsten Laukamp, Jessica Stromberg, Neil Francis, et al.
- Date Published: September 2021
Abstract:
Drill core analytical tools are used for objectively measuring geoscience parameters that aid mineral exploration or groundwater research. Multiple types of geoscience parameters are frequently compared alongside each other, but underlying physicoche...
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...
Seismic velocity analysis in the presence of AVO polarity reversals by fuzzy c-mean clustering
- Publication Name: AEGC 2021
- Authors: M. Javad Khoshnavaz, Duy Thong Kieu, Hamidreza Siahkoohi, Andrej Bόna
- Date Published: September 2021
Abstract:
Routine seismic imaging algorithms often require velocity models. Therefore, accuracy of velocity models obtained by velocity analysis plays a crucial role in seismic imaging. Seismic velocity analysis in CMP domain has been dominated by the use of a...
Calibrating BMR T2 Distribution logs to well test data
- Publication Name: AEGC 2021
- Authors: Keelan O’Neill, Mario Reyes, Benjamin Birt, Timothy Hopper
- Date Published: September 2021
Abstract:
Sustainable groundwater management plans are of critical importance to the future of increasingly scarce water resources. Borehole magnetic resonance (BMR) is a wireline logging technique used to provide in-situ formation evaluation. BMR can be utili...
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...