Estimativa de velocidade de onda eletromagnética em afloramento com ocorrência de carvão da Formação Rio Bonito, Candiota - RS

Abstract

Candiota city has the most extensive known reserve of coal mineral in Brazil, which is drilled only a few meters deep In the case of shallow exploration, several studies highlight the effectiveness of the ground penetration radar method (GPR) in an exploration project. However, in some studies, most authors draw attention to the quality of equipment calibration parameters, so that consistent results are obtained from this method. The primary goal of this work is to estimate the electromagnetic wave velocity in strata with the occurrence of coal from the Rio Bonito Formation, through the test with a metallic bar in a rock cut. From this, it was possible to determine the velocities of sandy and silty packages, 0,13636 m/ns and 0,05127 m/ns respectively, on a layer of coal and to relate the lithofacies of each outcropping stratum with reflected patterns of radargrams. Thus, the compilation of the results obtained provided subsidies for the application of the GPR method to support coal exploration in the Candiota region and localities with similar lithologies.