Banca de DEFESA: JOEDSON DANIEL DE ARAUJO FRANCO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOEDSON DANIEL DE ARAUJO FRANCO
DATE: 04/08/2026
TIME: 10:00
LOCAL: Videoconferência (Google meet)
TITLE:

Imaging and Modeling of GPR data in tufa deposits, Potiguar Basin, Quixeré, CE

KEY WORDS:

 Tufas; GPR; Digital Outcrop Model

PAGES: 104
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

The tufa deposits investigated in this study correspond to Quaternary continental carbonate  deposits that occur discontinuously along the eastern and southeastern escarpments of the  Potiguar Basin. In addition to their paleoenvironmental significance, these rocks are relevant  as analogues for carbonate reservoirs due to their depositional, deformational, and  petrophysical heterogeneities. Furthermore, they provide valuable analogues for understanding  the development of karst-related features and dissolution processes that commonly influence  fluid flow and reservoir performance in carbonate systems. The study area comprises an  inactive tufa deposit exposed along a road cut on the CE-377 highway and in an abandoned  quarry near the city of Quixeré, Ceará State, northeastern Brazil. The objective of this study  was to conduct a mesoscopic characterization of these deposits through the integrated analysis  of outcrop observations, shallow borehole data, and geophysical information. This  multidisciplinary approach aimed to establish geological-geophysical correlations, identify the  principal depositional and deformational heterogeneities, reduce interpretational ambiguities,  and support the construction of high-resolution three-dimensional (3D) virtual models of the  investigated tufa deposits. RPAS imaging covered an area of 31,000 m², with a spatial  resolution of 1.24 cm/pixel. Six GPR profiles were acquired in the SW-NE direction and two  profiles in the SE-NW direction, using a 200 MHz antenna. The calculated vertical resolution  was 17 cm. The maximum investigation depth reached approximately 9.5 m. One previously  acquired GPR profile was also incorporated and reprocessed. Based on the RPAS data, high resolution digital models (DEM and DTM) were generated, representing the external geometry  of the outcrop. The GPR profiles enabled the investigation of depositional and deformational heterogeneities in the subsurface. The borehole cores provided direct geological information  from the outcrop. All these data were incorporated into the MOVE™ modeling software. In  this software, DOMs were generated that honor the internal and external geometries of the  Quixeré outcrop

COMMITTEE MEMBERS:
Presidente - 1161652 - FRANCISCO PINHEIRO LIMA FILHO
Externo à Instituição - JOÃO ANDRADE DOS REIS JÚNIOR - UFRA
Externa à Instituição - JÉSSICA THAÍS FERREIRA OSTE - UFPR