Library

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’...

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...

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...

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...

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 ...

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...

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 ...

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...

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 ...

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...

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...

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...

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...

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...

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...

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...

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...

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...