Banca de DEFESA: JOAO VICTOR FREIRE PEREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOAO VICTOR FREIRE PEREIRA
DATE: 26/11/2022
TIME: 14:00
LOCAL: videoconferência https://www.youtube.com/c/PPGGUFRNTransmiss%C3%A3odeBancas
TITLE:

Integrating stratigraphy, petrophysics and karstified fracture network into a single 3D Digital Model: Example from the Cristal Cave (São Francisco Craton, NE/Brazil)

KEY WORDS:

Digital Outcrop Model; Discrete Fracture Network; karst; carbonate reservoirs.

PAGES: 57
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

Digital Outcrop Models (DOMs) are visual representations of geological sites in a virtual environment. DOMs are constantly evolving and widely used tools for geological investigations. However, in contrast with their broad applications, the full potential of DOMs is still underexplored in terms of their integration with other data. We present an integrative approach by combining a DOM with stratigraphic, petrophysical, fracture distribution and karst dissolution information into a single 3D georeferenced digital model. Fracture aperture enlargement due to karstic dissolution are implemented on a Discrete Fracture Network (DFN) to generate a Discrete Fracture and Karst Network (DFKN), where it is possible to compose different karstification scenarios. The used DOM is based on photogrammetric data obtained inside the Access 1 of the Cristal Cave. This cave developed in Mesoproterozoic carbonate rocks of the Caboclo Formation, in the Chapada Diamantina Group, São Francisco Craton, Northeastern Brazil, and has been used as a structural and diagenetic outcrop analogue for the Brazilian pre-salt carbonate reservoirs. The described Integrative Model combines both deterministic (stratigraphy and petrophysics) and stochastic (DFN and DFKN) elements. The framework of the Integrative Model reproduces the stratigraphy of the Access 1 as 22 parallel layers, which were populated with measurements of porosity, permeability and uniaxial compressive strength. Resorting to a stochastic approach, we obtained a 3D DFN by solving the stereology inverse problem, where statistical measurements of the fracture traces (power law and P 21 persistences) on the walls and ceiling of the cave are honored. Petrophysical parameters of the Integrative Model can be easily changed. Also, it is possible to modify the power law that relates aperture and fracture length to implement different karstification stages of the fracture apertures. As a result, different scenarios of primary and secondary porosities can be easily composed, which can be used in fluid flow simulations, thus facilitating the understanding of the multiple factors affecting the behavior of carbonate reservoirs.

COMMITTEE MEMBERS:
Interno - 1451214 - ADERSON FARIAS DO NASCIMENTO
Externo à Instituição - DAVID LINO VASCONCELOS - UFCG
Externo à Instituição - FRANCISCO CEZAR COSTA NOGUEIRA - UFCG
Presidente - 349684 - WALTER EUGENIO DE MEDEIROS