Banca de QUALIFICAÇÃO: LORENNA SÁVILLA BRITO OLIVEIRA
Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.STUDENT : LORENNA SÁVILLA BRITO OLIVEIRA
DATE: 22/09/2021
TIME: 08:00
LOCAL: videoconferência
TITLE:
Mechanical stratigraphy influences deformation band pattern in arkosic sandstones, Rio do Peixe Basin, Brazil
KEY WORDS:
Mechanical stratigraphic; Deformation bands; Petrophysical properties; Fault zones; Rio do Peixe Basin
PAGES: 46
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:
This study shows how mechanical stratigraphy influences deformation bands’ structural attributes in faulted, heterolithic arkosic sandstones in the Rio do Peixe Basin, northeastern Brazil. We combined the analyses of sedimentary units with rock properties measurements (porosity, permeability, Young’s modulus, Poisson’s ratio, and uniaxial compressive strength) and structural data to characterize the mechanical units and related deformation band pattern. Our results show that deformation bands have differences in frequency, geometry, thickness, and dip in different mechanical units. In addition, sedimentary parameters as grain size, layer thickness, stratification, cementation, and mineral composition impact the vertical propagation of deformation bands. In each layer, deformation bands frequency increases approaching a normal fault, and the dip of the deformation bands varies when passing through layers. In the studied mechanical units, deformation band density increases with increasing host rock porosity and decreasing Young’s modulus. Finally, we document that the development of deformation bands increases the overall cohesion of the fault zone, particularly in units with coarser grain sizes. Our data may have implications for mechanical stratigraphy in faulted siliciclastic reservoirs.
BANKING MEMBERS:
Externa à Instituição - ANITA TORABI
Externo à Instituição - JORGE ANDRÉ BRAZ DE SOUZA - PETROBRAS
Externo à Instituição - FABRIZIO BALSAMO
Externo à Instituição - DAVID LINO VASCONCELOS - UFCG
Presidente - 350640 - FRANCISCO HILARIO REGO BEZERRA