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Fiume, B. 2013. Detailed structural geology aiming at the elaboration of a conceptual model of groundwater flow circulation: a case study in Jurubatuba, SP. Dissertação (Mestrado), Instituto de Geociências, Universidade de São Paulo, São Paulo,165 p. In the surroundings of the Jurubatuba channel, São Paulo, the groundwater of the Crystalline Aquifer has elevated concentrations of Volatile Organic Compounds (VOC), which led to its prohibition to usage. In Brazil, the studies about highly contaminated areas are scarce, and especially in heterogeneous environments like the fractured aquifers. Therefore, in this context, this work’s main purpose is to elaborate a conceptual model of the fracture net in the Crystalline Aquifer, indicating the preferential ways of groundwater flow and, consequently, of its contaminants. A detailed investigation of the structural geology of the area was conducted, using the following methods: 1) analysis of lineaments in local and regional scale; 2) measurements of fractures in outcrops utilizing scanlines and observation points; 3) integrated geophysical logging (calipers, gamma radiation, temperature, electrical conductivity, optical and acoustic imaging – OTV and ATV – and flowmeter) in four deep wells. The results obtained led to the characterization of strike, dip, length and spacing of all fractures and its subsequent division in groups. The main fracture groups identified in the wells can be correlated to the ones observed in the outcrops. The groups are: (1) NW to NNW, subvertical; (2) E-W to ENE, subvertical; (3) NE, subvertical; (4) E-W to WNW, with dips between 30o and 60o; (5) NNE and NE, with dips between 10o and 40o. The fractures with direction NW, which are very common in outcrops, were subsampled in the wells dominated by fractures NNW. Another difference observed was related to the low dip NNE and NE fractures; in the wells it is clear that they are associated with the rock foliation, but they don’t occur in outcrops. The spacing obtained for the subvertical and medium angle groups in outcrops are more representative than the ones obtained through logging. However, the opposite is observed for the low angle group. The groups were then ordered following the spacing criteria. They are, in a decrescent order: NNE to NE/low angle, E-W to ENE/vertical, NW to NNW/vertical, E-W to WNW/medium angle and NE/vertical. The groups were also classified according to its importance of flow path, being: group E-W to WNW/medium dip was the least importance; the three subvertical groups had intermediate importance – not being possible to hierarchize between them; the most important group is NNE to NE and low to medium dip angle. This result is in agreement with one of the stress fields proposed in the literature, σ1 with NE direction and in a compressive regimen, where the fractures that favor the flow are of low angle.

Geologia estrutural de detalhe para elaboração de modelo conceitual de circulação de água subterrânea: estudo de caso em Jurubatuba, SP