Modelo geológico da sub-bacia Guaritas (Bacia do Camaquã, RS, Brasil), com base na interpretação de dados magnetotelúricos

Abstract

This paper presents and discusses the Sub-basin Guaritas sub-surface model through data acquired by Magnetotelluric (MT) geophysical method combined and associated with boreholes in the region. The Camaquã Basin is interpreted as the result of the superimposition of several independent sub-basins, successive in the same depositional locus linked to the final stages of evolution of the Dom Feliciano Belt, representing the Brasiliano orogeny in the state of Rio Grande do Sul. In the evolution of Sub-basin Guaritas are identified structures associated with extensional and compressional stress, coming from a formative and deforming tectonic visibly marked by grabens and horsts structures founded in geophysical sections. The boundaries of specific resistivity intervals allowed differentiation basement formed by Porongos Complex and Groups: Bom Jardim, Santa Barbara and Guaritas were later used in the composition of 2D and 3D models. The integrated analysis of the geophysical data with boreholes contributed to the understanding of the tectonic-sedimentary evolution of Sub Guaritas Basin and the Braziliano Cycle in the region.