b'AEGC 2021Short abstractscharacterized in the laboratory over 100 core samples fromGeoLab Research facility and accumulated a comprehensive the mine. Rock Physics laboratory measurements include bulkreference dataset that includes data with conventional geophones and grain densities, and ultrasonic P- and S-wave velocities atas well as new distributed sensors. The Curtin GeoLab based on a ambient conditions, in the axial and radial directions of thedeep well instrumented with fibre optics, surface deployed helical cores. In addition, four samples were selected to investigatefibre cables, a number of controlled sources. Here we present the pressure dependence of P-wave velocity. We found that theresults of recent DAS borehole trials and DAS surface experiments seismic reflectivity between the lithological units is low, exceptat the facility.for the massive basalt and the talc schist (shear zone) that show a notable acoustic impedance contrast with all lithologies. Given that most of the gold-host rocks at the mine seem to be245: Comparative hydrogeological characterisation of only economically mineralized when they are in the vicinitythe Springbok and Precipice Sandstonesof the shear zone, the delineation of this structure at high resolution can be attractive for Thunderbox mine planning. ToDr Oliver Gaede 1, Dr Pascal Asmussen2,1 and Dr David Murphy1further assess the use of seismic methods at this mine site, we1 Queensland University of Technologycomplemented this study with forward seismic modeling using2 The University of Queenslandthe laboratory measurements and representative geological sections as inputs. The Springbok Sandstone (Surat Basin, Australia) overlies the Walloon Subgroup, which is a significant target for Coal 243: Enhancing interpretation of geophysical modelsSeam Gas (CSG) production. In order to assess and mitigate possible groundwater impact of CSG production, it is critical using petrophysical logging to define groundwater flow units. This is challenging for the Dr Cericia Martinez 1, Mr Shane Mul2, Dr Jelena Markov1 andSpringbok Sandstone due to the significant heterogeneity Dr Teagan Blaikie2 of its mineralogy and lithology as well as hydrogeological properties. This contribution aims to reduce the uncertainty 1 Deep Earth Imaging Future Science Platform, CSIRO of the hydrogeological characterisation of the Springbok 2 Mineral Resources, CSIRO Sandstone through a comprehensive comparison with a well-understood aquifer in the Surat Basin: the Precipice Direct petrophysical measurements, such as density andSandstone. For the systematically comparison of both magnetic susceptibility, may prove useful in improving theformations new geochemical, mineralogical, and porosity interpretability of geophysical models. With measurementsand permeability data has been acquired. Here we becoming more abundant and the capability to measurepresent the results from over 200 samples. The laboratory petrophysical properties across the entirety of drill core, thereresults are used to calibrate petrophysical models for the is a need to explore to what extent such measurements maySpringbok and Precipice Sandstones. Our results show, that enhance or improve physical property models derived froma petrophysical model of the Springbok Sandstone needs geophysical inversion. to take into account a suite of minerals (in particular clays) Towards that goal, we seek to explore and develop a workflowin order to accurately predict the porosity of the formation. for using petrophysical data in 3D potential-field inversion. TheThe petrophysical models can be used to identify zones of Stavely Arc region is selected as a study area where drill corehigh and low permeability and therefore help improve the petrophysics and regional potential-field data are available.accuracy of groundwater impact assessments and mitigation We apply 3D gravity inversion to a subset of the regionstrategies.and use the available density measurements as constraints in the inversion. Results indicate that using petrophysical246: Subsurface characterisation using full waveform measurements in inversion may help to further constrain theinversion of vertical seismic profile data: Example from recovered physical property values in areas away from thethe Curtin GeoLab wellborehole locations.Ms Sana Zulic 1,2, Mr Andrej Bona1, Prof Roman Pevzner1, Dr Konstantin Tertyshnikov1 and Dr Alexey Yurikov1244: Curtin In-Situ GeoLabadvancing geophysical1 Curtin Universitysensing 2 HiSeis Pty LtdDr Konstantin Tertyshnikov, Mrs Sana Zulic1, Dr AlexayFull waveform inversion (FWI) utilises the complete seismic Yurikov1, Dr Sinem Yavuz1, Mr Evgenii Sidenko1, Mr Romanwavefield (transmitted, reflected and converted waves) to build Isaenkov1 and Prof Roman Pevzner1 the models of subsurface physical properties. In this abstract, 1 Curtin University we show results from a feasibility study of 2D FWI applied to synthetic multi-offset vertical seismic profile (VSP) dataset Developments and advancements in geophysical instrumentationbased on the subsurface model of Curtin Geolab Well-01. The and sensing is ever going process. The Distributed Acousticworkflow is tested on the synthetic data and then applied to the Sensing (DAS) is a novel approach in sensing which constantlyfield multi-offset VSP data acquired at the Geolab facility. For increasing its presence in various geophysical applications.the forward problem of FWI, we use finite difference modelling, It is paramount to understand the measurements, what arewhile for inverse problem we use L-BFGS optimisation method the limitations and performance of the technology for properfor the minimisation of the misfit function. The test on the utilisation. Benchmarking emerging technologies againstsynthetic data demonstrated that the workflow is robust and conventional receivers and cross challenging different equipmentcan be successfully applied to the field multi-offset VSP data designs in is also essential. Curtin University has built the In-Situacquired at the Geolab facility.AUGUST 2021 PREVIEW 104'