Geological and geophysical studies based on the Vertical Electrical Sounding (VES)
research technique were used in the identification of tectonic lithofacies of the carbonates and
siliciclastic Neogene deposits, corresponding to the Pirabas and Barreiras Formations, and
Quaternary sediments of the Post-Barreiras unit, which constitute the Bragantina Platform, in
the municipality of Capanema and Primavera, continental region of the northeast of the state
of Pará. The apparent resistivity data of the electrical soundings were processed using the
IPI2win program, which is designed to perform automatic 1D inversions, correlating them
whenever possible with the lithological profiles of wells, available in the online platform of
the Groundwater Information System (SIAGAS ), with the purpose of adjusting the thickness
values of the layers (provided by the lithological profiles) with the the initial geoelectric
model solution of and estimating the resistivities of each layer according to the mineralogical
composition described in the wells. The results of the electrical soundings carried out in this
work were satisfactory, since they allowed to differentiate the possible contact between the
Pirabas Formation with the crystalline basement at a depth of around 50 meters in the
municipality of Capanema, due to the strong resistivity contrast, and in the Pirabas and
Barreiras Formations, around 9 meters deep.
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