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. The hydrogeophysical features of the Reconcavo aquifer system in the area of the Capivara Grande and Capivara Pequena rivers, in Camac¸ari and Dias D’Avila counties were studied through the analysis of 64 Schlumberger vertical electrical soundings expanded to AB/2 spacing of 1.000 m. This characterization was also supported by the analysis of lithologic logs of 29 water exploration wells, 14 of which have available geophysical logs. The results were useful to outline the structural conguration of the regional aquifer system in the area, from the surface up to 450 m in depth. The multi-conned component is the dominant portion of the system with the main storage being within S˜ao Sebasti˜ao sandstone bodies. The aquifer substratum is mostly represented by a thick shale sequence inter-layered with siltstones and ne shaly sandstones, referred by Lima (1999) as the Upper Shaly Sequence (SAS). The geometry of the aquifer system is basically controlled by normal faults oriented NNE and WSW, that transect the S˜ao Sebasti˜ao Formation in the area. A large undulated synclinal was recognized between Salvador Fault and the western water divide of Capivara Grande and Capivara Pequena river basins. The central zone of this structure, where the aquifer substratum is deeper, corresponds to the Capivara Grande river valley. Keywords : Reconcavo aquifer system, vertical electrical soundings, geophysical logs, Sao Sebastiao Formation. RESUMO . As caracteristicas hidrogeofisicas do sistema aquifero Reconcavo na area das bacias dos rios Capivara Grande e Capivara Pequena – municipios de Camacari e Dias D’Avila, Regiao Metropolitana de Salvador – Bahia, foram estudadas atraves da execucao e interpretacao de 64 sondagens eletricas verticais realizadas com arranjo Schlumberger com ate 2.000 m de separacao entre eletrodos de corrente. Foram usados tambem pers geologicos de 29 pocos exploratorios de agua, alem de pers geofisicos de 14 deles. Os resultados permitiram delinear a conguracao estrutural do sistema aquifero regional, desde a superficie ate 450 m de profundidade. O componente multi-connado constitui a maior parte do sistema na area estudada, com o principal armazenamento ocorrendo nos arenitos da Formacao Sao Sebastiao. Na maior parte, a base desse sistema e representada por espessos pacotes de folhelhos, intercalados com siltitos e arenitos argilosos nos, que constituem a Sequencia Argilosa Superior (SAS) proposta por Lima (1999). A geometria do conjunto aquifero e basicamente controlada por sistemas de falhamentos gravitacionais de direcoes NNE e WSW que seccionam toda a Formacao Sao Sebastiao na area. Distingue-se uma ampla calha sinclinal ondulada entre a linha da Falha de Salvador e o divisor ocidental das bacias dos rios Capivara Grande e Capivara Pequena. A zona central mais profunda do aquifero corresponde ao vale do rio Capivara Grande. Palavras-chave: sistema aquifero Reconcavo, sondagens eletricas verticais, pers geofisicos, Formacao Sao Sebastiao.

STRUCTURAL, LITHOLOGICAL AND PETROPHYSICAL CHARACTERIZATION OF THE RECÔNCAVO AQUIFER SYSTEM IN THE CAPIVARA RIVER BASIN, BAHIA STATE, BRAZIL