Banca de DEFESA: Maria Moutinho Masella Machado de Mendonça

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Maria Moutinho Masella Machado de Mendonça
DATE: 26/07/2023
TIME: 14:00
LOCAL: Sala de videoconferência e Teams
TITLE:

Quantitative High-Definition Mineralogy and Its Application in Reservoir Quality of the Upper Barra Velha Formation, Santos Basin.

KEY WORDS:

Upper Barra Velha Formation, Diagenesis, Sedimentary facies, QEMSCAN

PAGES: 77
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geologia
SUMMARY:

The reservoir rocks of the post-rift section of the Santos Basin pre-salt present a relatively simple primary mineral association. However, post-depositional processes increase their complexity, camouflaging these constituents. This study aimsto contribute to the existing body of knowledge on the in situ and reworked facies description of the Upper Barra Velha Formation, considering the constituents, the texture, the porosity, and the permeability of the rocks. 3D seismic interpretation suggests that the studied rocks are located structurally in a horst already elevated even before the moment of the deposition of the Barra Velha sediments. The integration between petrographic data from optical microscopy and quantitative mineralogy, added to the description of cores, well-logging data, and seismic data provided by the ANP, provided a broad understanding of the microscopic (millimetric) to the macroscopic (metric) scale cycles stacking, defined by in situ and reworked facies, which are proportionally distributed along the studied pools. Dolomitization and silicification were quite intense. The main minerals analyzed via QEMSCAN were dolomite, calcite and quartz, the result of depositional and post-depositional processes. On average, the samples along the cores showed 40% dolomite, 40% calcite and 20% quartz. Finally, although the processes of diagenesis and hydrothermalism affected the reservoir's porosity and permeability, the facies' granulometry was essential for defining the quality of the reservoir. Finally, coarser facies such as shrubs and grainstones showed greater porosity and absolute permeability. In contrast, fine-grained facies such as mudstone and packstone remained non-reservoir and poor reservoirs, respectively, even after their primary components were replaced.

BANKING MEMBERS:
Externo à Instituição - ALESSANDRO BATEZELLI - UNICAMP
Interno - 1336460 - FEDERICO ALBERTO CUADROS JIMENEZ
Interna - 1658822 - LUCIETH CRUZ VIEIRA
Presidente - 1644358 - PAOLA FERREIRA BARBOSA