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Determinação das espessuras do Sistema Aquífero Urucuia a partir de estudo geofísico

2012; Sociedade Brasileira de Geologia; Volume: 42; Issue: s1 Linguagem: Inglês

10.5327/z0375-75362012000500013

2177-4382

Márcia Tereza Pantoja Gaspar, José Elói Guimarães Campos, Roberto Alexandre Vitória de Moraes,

Fish biology, ecology, and behavior

The Urucuia Aquifer System is a groundwater reservoir of regional extension composed by interrelated aquifers subtypes. The aquifer is constituted by aeolian well sorted quartz and feldspatic sandstones with silicified levels, and in smaller proportion of conglomeratic beds related to the Urucuia Group, Upper Cretaceous of the Sanfranciscana Basin, the Phanerozoic São Francisco Craton cover. The aquifer system extends from the south of Piauí state to the northwest of Minas Gerais state, with the larger expression in the west of Bahia state. It presents a longitudinal divisor axis that separates the flow to the west (Tocantins river watershed) and to east (São Francisco river watershed). The aquifer system was divided into four subsystems denominated as regional not confined aquifer; local perched aquifer; confined or semi-confined aquifer and deep not confined aquifer. The thickness of the Urucuia Aquifer System was estimated from 100 to 600 m in the 26 stations submitted to a geophysical study with the time-domain transient electromagnetic methods. The saturated thickness varies from 80 to 460 m.