b'AEGC 2023Short abstractspassively listen to the noise emitted by drilling. Some otherenable identification of out of plane energy compared to that methods required an additional receiver along the drill stringin the plane, it may focus events that exhibit unconventional to record a reference or pilot signal of the drill bit, consequentlymove-out, and can lead to a greater appreciation of event cross-correlated with other receivers to imitate an active seismicpositioning uncertainties.survey. Ideally, we would like to continuously record the pilot signal as close as possible to the drill bit location; however, thatThe velocity scanning method is often used as a processing limits the real-time ability to process and interpret the recordedtool to help narrow down uncertainty surrounding velocity data as current downhole recording options are memory-basedfunctions used in the pre-stack migration workflow but is rarely and do not allow real time high bandwidth telemetry. Therefore,used by a seismic interpreter. With modern computing power a receiver is usually placed on the drilling rig to record a time- and advanced imaging algorithms, this approach can easily be delayed version of the drill bit pilot signal. On the downside,adopted into the seismic interpreters toolkit. With a delivery reliance on the latter option limits the depth extent and mostlyfrom the processing house of up to 20 sections to interpret faces availability issues. Additionally, crosscorrelation of a pilotfrom, instead of just the one deemed most likely by the signal recording can propagate undesired recorded pilot noiseprocessor, this brings uncertainty management into the hands into the correlated records. Hence, through synthetic modelling,of the interpreter where it can be understood and managed as this abstract investigates the possibility of eliminating the needpart of the interpretation flow.to use a pilot signal for SWD applications.Sedimentary copper deposits : Which basin is hiding Geophysical discovery of the Cerro de Maimon Souththe next Big Copper Belt?VHMS. Bruce HooperKate Hine Sedimentary copper deposits have been significant copper Mitre Geophysics Pty Ltd producers for over a hundred years and are now more important than ever. The paper will address where are we going The recent Cerro de Maimon South discovery is an excellentto find further economic deposits and how we are going to example of a blind discovery at 400 m depth. The discoveryfind them.Where are the new giant belts like the Central African was made as a result of downhole EM follow up on a drillCopper belt and the Kupferschiefer belt in Poland going to be hole targeting a deep 3D offset pole-dipole IP anomaly.discovered worldwide and in Australia.Factors critical to the success included careful processing and reprocessing of the IP to yield a better model. Systematic drillingSedimentary copper deposits are some of the most sustainable of all eight of the best IP anomalies (not just the best two orcopper developments as they are high grade meaning they three) and, most importantly, a DHEM survey to define whethercan be mined underground, require less tailings and have there were any near miss conductors. Drilling of the DHEM platebeen found in low density population regions. Unlike Porphyry model yielded a conductor which had already been intersectedCopper deposits, which are low grade and require very large at its lower corner by the drill hole. However the explorationopen pits with enormous waste dumps and tailings dams and team persisted to drill a second and third hole in order to testare found in the Pacific Ring of Fire with high relief, rainfall the center of the plate conductor. The resulting intersection ofareas and high population densities. Developing copper belts 30 m at 2-5% copper was the discovery hole. Subsequent followworldwide such as the Kalahari Copper Belt, Africa and the up DHEM and drilling showed a ~ 1.5 km long massive sulphideSullivan Belt in North America will be outlined and the modern len comprising a large VHMS system. Interestingly, the depositexploration techniques being used there described on how is so long that it can mapped using current channeling of the 60to unlock the potential Australian Belts such as the McArthur Hz electric fields from the regional powerlines. River, Northern Territory, Mt Isa, Queensland and the Paterson Province in Western Australia are discussed on advancing of geological understandings and tools to explore for new giant Velocity scan migrations: A valuable addition to thestyle deposits.seismic interpreters toolkitPeter Hoiles1 and Helen Debenham2 Advances in geophysics while drilling for reverse 1 Discover Geosciencecirculation drilling.2 Searcher Timothy Hopper, Darren Palmer, Gaede Oliver, Joanna Lim, Interpretation of 2D seismic data is often challenging, especiallyJonathan Ross, Calvin Lau, Jason Valuri, Daksh Parashar, in land data with complex overburden. Out of plane energy,Nathaniel Williams and Stewart JacksonS-wave contamination and low signal to noise ratio often resultsOricain a seismic section with considerable levels of uncertainty. A novel, yet often overlooked, method available to an interpreterGeophysics While Drilling (GWD) is an emerging technology as part of a processing or re-processing project is thein the Reverse Circulation (RC) drilling industry. Logging While percentage velocity migration scan method whereby velocityDrilling has been an established technology for decades in the fields are perturbed around a centrally picked velocity functionOil and Gas industry, however the extreme shock profile of RC and pre-stack migrated to yield a series of differently imageddrilling (2,000-3,000 g) had prevented any downhole tools from and stacked sections. These sections, often built from velocitybeing used in the mining industry. Recently, a downhole behind models perturbed to 80-120% from the central velocity field,the hammer instrument has started commercial operations in the can then be examined by the interpreter to narrow down levelsPilbara. This instrument provides natural gamma ray (GR), Gyro of uncertainty. Scanning through the sections will potentiallyand Drilling Dynamics data, acquired whilst drilling. This data can FEBRUARY 2023 PREVIEW 104'