Aplicação do método gravimétrico para estudo da geologia de subsuperfície na área do Campus Universitário do Pici e no município de Fortaleza.

Abstract

The gravimetríc methods are very important in subsurface geology surveys due to their diverse applicability, and have been used since hydrocarbons exploration until geological studies, such as in the investigations of large and médium scale structures. In order to enable the researchers team of the Laboratório de Geofísica de Prospecção e Sensoriamento Remoto (LGPSR), an acquisition of gravimetríc data was executed in the area of Campus do Piei, this data were integrated with gravimetríc stations of Fortaleza originated from LGPSR database, and were processed and interpreted, allowing to uncover geological and tectonic structures. The interpretation allowed to find out the positive anomalies, between 0.1 and 0.6 mGal, in Campus do Piei, which can be associated with high-density rocks or horst, and NE-SW lineaments. In Fortaleza city and its surroundings, there is an increase from south to north in the gravitational field, this can be associated with the crustal thinning of the passive continental margin in Northeast of Brazil, as well as lineaments in the first NW-SE order direction. The Euler deconvolution allowed to identify, for the Campus do Piei area, shallow strueture possibly associated to the Barreiras Formation, for Fortaleza municipality, have been identified structures with depths between 1000 and 2000 meters that can be correlated to discontinuities and failures caused by recent tectonic activity and/or reactivated faults in crystalline basement. The 2D geological model was generated for Campus do Piei, aiming the characterization of the geometry and depth of the geological units, which had its results corroborated by the constructive section ofthe LGPSR-UFC's tubular well.