Evolution of water salinity in coastal offshore aquifer

What is it about?

Offshore fresh or brackish groundwater has been observed around the globe and represents freshwater reserve. Formation waters in sedimentary basins evolve at geological time. However, the mechanism and timing of freshwater displacing and mixing with pre‐existing formation water offshore under the seafloor has not been investigated in many cases. A low‐salinity wedge of meteoric origin with less than 5000 ppm currently extends to about 20 km offshore in the confined Latrobe aquifer in the Gippsland Basin (Australia). The objective of this study is to constrain the evolution of formation water in the Latrobe aquifer by investigating the water naturally trapped in rock as mico-cavities in minerals.

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