Litho-structural conditioning in the exploration of fractured aquifers: a case study in the Crystalline Basement Aquifer System of Brazil

Productive regions in the Crystalline Basement Aquifer System (CBAS) Paraná state, Brazil, were identified qualitatively and quantitatively through spatial correlation of wells geological conditions such as lineaments, hydrography, aeromagnetometry lithology. Different methods applied Precambrian metamorphic igneous aquifers around world some Brazilian states integrated CBAS with aim understanding best scale approach to productivity. The median productivity 224 analyzed is 0.29 m3/h/m. Under a multi-scale regional assessment, results showed that condition associated distance 350 m from lineaments (1:100,000), especially those directions N40W, N10E N70E. Considering hydrolithological units, gneisses are most productive, where coincide structures shear zones, foliations Cenozoic tectonic reactivations. Quartzites, granitoids, schists, phyllites, rhyolites also favorable when close important rivers not necessarily coinciding high density or vertical fractures. areas intersection weathering mantle did serve discriminatory parameter. As depths water reach 90 surface, extraction oriented magnetic gradients referred sources down 800 depth, thus corroborating surface mapped new nonoutcroppable structures. complexity environment global use groundwater fractured aquifers, this work contributed by discriminating geospatial parameters decrease exploratory risk CBAS.