Arifin, A; Taylor, RG; Shamsudduha, M; Ramdhan, AM; (2023) Characterising deep groundwater salinity in the Lower Kutai Basin, Indonesia, from resistivity logs. In: NSG2023 29th European Meeting of Environmental and Engineering Geophysics. (pp. pp. 1-5). European Association of Geoscientists & Engineers: Edinburgh, United Kingdom.

Text NSG2023 Arifin etal 2023.pdf - Accepted Version Access restricted to UCL open access staff Download (1MB)

Abstract

Deep (>500 m below ground level) groundwater in Indonesia’s sedimentary basins, including the Lower Kutai Basin, has yet to be well characterized. Here, we present an approach to characterise groundwater salinity in the Lower Kutai Basin using resistivity logs, which are tested against available measurements of groundwater salinity. Synthesised groundwater salinity data suggest that fresh (total dissolved solids ≤ 1000 mg/L) groundwater can occur to depths of up to ~1.3 km. The data indicate that the most deep groundwater is either brackish or saline. By applying Archie’s equation and adjusting its empirical constant, we generate a formation resistivity cut-off to identify fresh groundwater in sandstone. We note, however, that the presence of hydrocarbons can increase the formation resistivity. We highlight that knowledge of hydrocarbon occurrence is essential in the characterisation of groundwater salinity from resistivity logs in deep sedimentary basins.

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