Banca de DEFESA: CARLA PATRÍCIA QUEIROZ FURTADO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : CARLA PATRÍCIA QUEIROZ FURTADO
DATE: 29/04/2022
TIME: 14:00
LOCAL: videoconferência https://www.youtube.com/c/PPGGUFRNTransmiss%C3%A3odeBancas
TITLE:

Multi-scale analysis of digital outcrop of carbonate reservoir analog in Salitre Formation

KEY WORDS:

Carbonate reservoir analogs; Digital outcrop; Electrical Resistivity Tomography; Fracture corridors; LiDAR.

PAGES: 95
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

The present study investigates the influence of sub-seismic fractures on the interconnectivity and flow of fluids associated with folded carbonate rocks, and their role in the stages of evolution of the karst process in the Brejões System, Irecê Basin, Northeastern Brazil. We also seek to promote the geophysical characterization of the Brejões I and the surrounding karst system. We carried out 3D remote sensing surveys on the surface with an Unmanned Aerial Vehicle (UAV), and subsurface with Terrestrial Laser Scanning (TLS). Based on the digital outcrops, we performed an analysis of fracture attributes and bedding measurement, fracture length distributions, persistence estimations, topological, morphometric, and geophysical investigation. Multiscale analysis shows that fracture corridors, caves, and canyons occurred along a hinge of a N-S-oriented anticline or parallel to it. The fracture dataset from surface and subsurface are related and in concordance with two compression events related to the Brasiliano orogeny. Power-law exponents greater than 2.5 suggest the influence of all fracture lengths on the connectivity of the Brejões system, with emphasis on fractures smaller than 50 m. The topological analysis demonstrated a highly connected fracture network, above the percolation limit, with extensive clusters and several levels of interactions. These results are supported by the wide distribution of persistence values in the fracture intensity (P21) and density (P20) maps. The morphological attributes applied in geophysical prospection allowed the optimization of its stages and direct correlation with the signature of the cave. The ERT method showed a wide range of electrical resistivity (100 - 10,000 Ohm.m), thus reflecting different levels of weathering and karstification in the Brejões system. Based on the geomorphological and structural scenario described, type I and II reservoirs were associated with the Brejões System. Their marked anisotropy may imply preferential fluid migration routes, which may impact all phases of exploration. Our results reveal that the mapping of fold-related damage zones can be an alternative approach for identifying sub-seismic scale fracture corridors. The use of LiDAR as an auxiliary methodology in the stages of geophysical prospecting with Electrical Resistivity Tomography (ERT) promotes a new perspective for the analysis of 3D effects in karst environment.

BANKING MEMBERS:
Externo à Instituição - DAVID LINO VASCONCELOS - UFCG
Externo à Instituição - FABIO LUIZ BAGNI - PETROBRAS
Presidente - 350640 - FRANCISCO HILARIO REGO BEZERRA
Externo à Instituição - JOÃO ANDRADE DOS REIS JÚNIOR - UFRA
Externa à Instituição - MARIA OSVALNEIDE LUCENA SOUSA - UFRN