b'AEGC 2023Short abstractsUsing seismic trace density for optimal 3D seismicMount Isa Province and McArthur Basin. We utilise new survey design. geophysical data, including gravity, magnetic, and sedimentary thickness, to define the borders and structure of the Carrara Mostafa Naghizadeh, Andrea Crook, Peter Vermeulen, AlysonSub-basin.Birce, Stephanie Ross and Cameron CrookWithin the South Nicholson Basin, the Constance OptiSeis Solutions Ltd. Sandstone contains poor to good source rocks, which have the potential to generate gas. Recently drilled Seismic reflection surveys are integral part of petroleumwells indicate that within the NLHP, the River and Lawn exploration projects in sedimentary (soft) rock environmentsupersequences of the underlying Isa Superbasin may and recently they have become a common prospectingcontain prospective shale gas plays. We apply new data method for the mineral exploration projects in crystallineobtained from the recently drilled NDI Carrara-1 well to (hard) rock environments. As mineral exploration projectsconduct an exhumation study for the area by estimating focus more on deeper targets, seismic methods can playdecompacted thickness, porosity, and maximum burial a crucial role to accurately image the extent/shape of oredepths of significant stratigraphic horizons identified within deposits. However, this will require prudent design ofthe South Nicholson Basin and Isa Superbasin. These results seismic surveys to assure proper illumination of desiredshed light on important geological events and parameters subsurface targets. Seismic trace density is an importantin the basin (including uplift, subsidence and sedimentation parameter that plays a crucial role in determining therate). The resulting burial history is a crucial step in quality and resolution of seismic images. While seismicdetermining the mineral and hydrocarbon prospectivity of fold map is calculated for specific bin size, trace density isthe region.defined as the number of traces per square kilometer and therefore it is a more reliable measure of sufficient spatial sampling rate of the seismic wavefield. For land seismicDepositional environment and genesis of acid drainage surveys, after determining the source and receiver lineof some coal deposits in South Africaspacing with adequate offset and azimuth coverage, trace densities can be increased by reducing the source andLindani Ncube, Baojin Zhao, Helena Johanna van Niekerk and receiver spacing along the lines and/or by including moreSonwabile Rasmeniactive receiver lines per source point. We have examined the trace density effect on the resolution of seismic gathersUniversity of South Australiaand stacks by decimating a densely acquired 3D realCoal deposits have been and continue to be the primary seismic survey with various geometries and then usingsource of energy in South Africa. The continuous use of the 5D interpolation algorithms to reconstruct the missingcoal, presents many challenges that includes generation seismic records. Using linear-type (zigzag or sinusoidal)of acid mine drainage (AMD). The aim of this study was to geometries could lead to shorter seismic cutlines comparedinvestigate the role of source rocks and their depositional to the conventional orthogonal surveys and hence canenvironments on AMD generation in South African coal substantially reduce the environmental footprints ofmine environments. Five collieries, from five coalfields seismic surveys. However, it is important to increase thewere selected as case studies. These coal deposits are all trace density of linear-type geometries to equal the tracelocated in the Main Karoo Basin or its subbasins. The results density of matching orthogonal geometries in orderobtained indicate that the Karoo Supergroup was deposited to attain desired signal-to noise ratios, particularly forin a passive margin tectonic setting with the sediments datasets requiring AVO-compliant processing and pre- derived from felsic source rocks, and the sediments are of stack analyses. We will present and compare seismic dataglacial-marine origin, minimal to moderately weathered interpretability for several geometries with varying traceand were deposited under cool to temperate climate. The densities. sandstones belong to arkose to sub-arkose categories are of mixed provenance ,generally exhibit high concentrations Structure and burial history of the South Nicholsonof feldspars, which favour either high relief, arid or arctic climate with less chemical weathering at the source area. Basin, NE Australia. The presence of glauconite attests to a marine continental Harikrishnan Nalinakumar, Bhavik Harish Lodhia, Stuart Clarkshelf depositional environment. The sediments have and Artur Shapoval experienced a sequence of diagenetic alterations. Calcite cementation, feldspar dissolution, kaolinite infilling, University of New South Wales pyrite grain coatings, albitisation and pressure solution characterise theses sediments. Higher contents of tadpole-With only a few studies conducted in the past years,shaped pyrite in coal and non-coal strata is ascribed to early South Nicholson Basin is one of Australias least-exploreddiagenetic origin, and is closely related to the generation geological areas. Despite growing interest in mineral andof AMD. On the other hand, sediments of the Sub-Basins petroleum prospectivity, minimal seismic, well, and geophysicalare highly weathered, and were deposited under a warmer data exists for the region. A vital outcome of the recentlypalaeo-climate, are sub-arenites to quartz arenites with published Exploring For the Future (EFTF) programme wasthe sandstones being of recycled origin. The sediments the discovery of a new sub-basin, named Carrara Sub-basin.represent cratonic interior provenance. Quartz overgrowth This sub-basin is ~ 125 km wide, ~ 190 km long and ~ 8 kmand clay matrix filling are typical alterations for the deep. The sub-basin is bound by a gravity low on the SE sidesediments of the Sub-Basins. Sandstone units are prevalent, of the South Nicholson region and contains thick sequences ofexcept in the Waterberg Coalfield where mudstones are Proterozoic rocks of the Northern Lawn Hill Platform (NLHP),prevalent.123 PREVIEW FEBRUARY 2023'