b'AEGC 2021Short abstractsdata collected from Site 2 revealed a large broken buried pot,spatial variations in fault properties can drastically alter the and a partial stone disc. resulting flow, yet data sparsity often forces modelers to The results of the GPR investigation proofed by excavationconsider simplified systems with constant properties.verified the value of using GPR within the project for theIn this contribution we focus on predicting flow patterns location of burials, burial features and artefacts. associated with generic fault architecture comprising damage zones adjacent to a thin low permeability fault gouge. We analyse the characteristics of such fault systems and the 177: Simultaneous inversion of teleseismic P- andsensitivity of the flow field to various parameters. We investigate converted S-waves to constrain the seismic structure ofthe factors influencing fluid flow localisation and showcase the crust general scenarios with widely different outcomes for the flow depending on the level of details considered. These results Dr Mehdi Tork Qashqai 1 and Dr Erdinc Saygin2 demonstrate the necessity to model such fault systems appropriately and consider thin geological features that are 1 Deep Earth Imaging Future Science Platform, CSIRO often neglected.2 Deep Earth Imaging, Future Science Platform, CSIRO In particular, we apply our findings to the Proterozoic McArthur Traveltimes of P and mode-converted S-waves and theirBasin of northern Australia, one of the most endowed Zn-Pb reverberations place a tight constraint on the Vp/Vs ratio andprovinces in the world. We aim at accounting for the complex their amplitude ratio provides tight bounds on the P and Sstructural framework and sedimentary facies distribution wave velocity jumps across the main discontinuities in thewithin the basin to link conceptual model studies with more subsurface structure below a seismic receiver. Seismic P-to-Sgeologically realistic scenarios. This will ultimately lead to a converted waves have been used for decades to estimatebetter understanding of the geological processes related to the shear-wave velocity of the subsurface and depths ofeconomic mineralisation.major discontinuities below a seismic receiver through a method known as the P wave receiver functions. Here, a new and alternative approach is presented using P and all179: Permeability modelling using digital rock images mode-converted shear waves in a probabilistic joint inversionfrom micron scaleframework to simultaneously estimate seismic properties of the crust (Vp, Vs, and Vp/Vs). These waves are extracted by theDr Lionel Esteban 1, Dr Mojtaba Seyyedi1, Mr Cameron autocorrelation of the teleseismic P-wave coda recorded onWhite1, Dr Ausama Giwelli1, Dr Valeriya Shulakova1, Dr Marina the radial and vertical component of a three-component (3C)Pervukhina1, Dr Samuel Jackson1, Dr Amir Aryana1, Dr Yoshitake seismic receiver. In the application of the methodology, weKato2, Dr Mai shimokawara2, Prof Takeshi Tsuji3, Dr Arata Kioka3, image the crust along a north-south oriented passive seismicDr Tatsunori Ikeda3, Dr Joel Sarout1 and Dr Fei Jiang3line (BILBY) in central Australia, which traverses multiple1 CSIROgeological domains. The overall trend of our inferred Moho2 JOGMECfollows the long-wavelength pattern of the Moho interpreted3 Kyushu Universityfrom the deep seismic reflection line-GOMA parallel to the BILBY experiment. It is also consistent with the reflectivityRock permeability is a pivotal input for fluid flow simulations changes seen at the base of the crust in the GOMA seismicin various geological settings and impacts a broad range of section. Our approach is a cost-effective method and can beapplications in the fields of energy security, gas underground used in conjunction with the deep active seismic reflectionstorage, water and mineral resources utilisation, to name a profiling to obtain additional information, especially at depthsfew. Recent technology improvements allow gaining a digital where the deep seismic reflection method cannot image. 3D replica of natural rock using fast and non-destructive tomographic techniques. Combining 3D images from medical and micro-CT scanners, natural rocks can be scanned at 178: Modelling the impact of fault damage zones ondifferent scales reproducing micrometre details of the meter-fluid flow localisation long cores. Successful benchmarked laboratory experiments studies of permeability upscaling to meter scale, typically used Dr Thomas Poulet 1, Dr Ulrich Kelka1, Dr Vincent Crombez2, Drfor reservoir simulations, are still in their infancy.Marcus Kunzmann1, Dr Teagan Blaikie3, Dr Heather Sheldon1 and Dr Martin Lesueur4 In this study, a Boise reservoir sandstone is chosen to study permeability upscaling both experimentally and numerically 1 CSIRO from a few millimetre-long micro samples to a meter-long core. 2 CSIRO Energy, Deep Earth Imaging This sandstone does not exhibit complex geological structures 3 Mineral Resources, CSIRO and the mineralogy consists of 45% quartz, 50% feldspar, and 5% 4 Lawrence Berkeley National Laboratory clay minerals. The porosity and permeability measured on the Faults are essential geological features controlling subsurfacemeter-long core are 31 3 % and 4.40.5 Darcy, respectively.fluid flow and often play a critical role in geological modelsBoise sandstone is X-ray imaged at three scales from dry to full for different applications, including mineral exploration,water saturation state: meter-long core (voxel resolution 100 m), geothermal energy, nuclear waste disposal and reservoirplug scale (voxel resolution 100 m and 15 m) extracted along engineering. Their effects range from representing flowwith the meter-long core, and mini-plug scale (voxel resolution conduits to barriers, with all combinations in between. Their1 m) extracted from the previous plug samples. At full saturation, complex nature also makes it particularly challenging tothe water permeability is measured at all three scales. The X-ray account for their impact realistically. Indeed, consideringimages in the dry and water-saturated state (meter, plug, and AUGUST 2021 PREVIEW 92'