Search

Your search keyword '"Vidal, Alexandre Campane"' showing total 198 results
Start Over "Vidal, Alexandre Campane"
198 results on '"Vidal, Alexandre Campane"'

22. Petrographical and petrophysical characterization of pre-salt Aptian carbonate reservoirs from the Santos Basin, Brazil.

Author

Zeitoum, Najlah, Vidal, Alexandre Campane, Ruidiaz, Eddy Muñoz, and de Almeida, Rafael Valladares

Subjects
CARBONATE reservoirs, PETROLEUM prospecting, PERMEABILITY measurement, IMAGE analysis, POROSITY
Abstract

Reservoir quality in carbonates is influenced by various factors such as the depositional environment, burial history and diagenesis processes. Understanding these geological heterogeneities is essential for successful petroleum exploration. This study characterizes Brazilian pre-salt reservoirs and aims to understand how their heterogeneity impacts reservoir quality. We analysed carbonate samples from the Barra Velha Formation (Santos Basin) through an integration of petrographical and core plug descriptions, petrographical facies characterization, porosity and permeability measurements, and image analysis to identify the principal controls on porosity and permeability, pore-size distribution, and groups with similar petrophysical properties using the hydraulic flow unit (HFU) concept. Five facies groups were recognized: Spherulitestone (F1); Shrubstone (F2); Intraclastic Grainstone (F3); Intraclastic Packstone, Spherulitestone with mud and Shrubstone with mud (F4); and Shrub–Spherulite Intercalations and Bioclastic Grainstone (F5). The analysis of porosity and permeability showed that their variations are associated with pore type and cementation rate. Greater contributions of inter-aggregate, interparticle and vugular porosity, combined with a reduced amount of cement, results in higher porosity and permeability but an increase in cement tends to reduce the porosity and permeability. Among the facies groups, F2 and F3 exhibited the best porosities and permeabilities, followed by F1, F4 and F5. From image analysis, small pores (1.5 × 10−5–0.01 mm2) are the most common in all rocks. However, these small pores contributed significantly to total porosity only in F4 and some samples of F3. For F2 and F3, the large pores (from 0.01 mm2 to a maximum of 19.62 mm2) are the main contributors, while F5 has a homogeneous contribution. Finally, the data were grouped into five HFUs: HFU1 and HFU2 represent the zones with the best reservoir quality, primarily composed of F2 and F3. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

26. Paleokarst features in the Aptian carbonates of the Barra Velha Formation, Santos Basin, Brazil

Author

Nworie, David Chibuzor, Chinelatto, Guilherme Furlan, and Vidal, Alexandre Campane

Subjects
Barra Velha Formation, image log, Santos Basin, karst, fractures, pre-salt, carbonate reservoir, seismic attribute analysis, Brazil
Abstract

Seismic data, borehole image logs, and conventional well logs were used to investigate the distribution and characteristics of paleokarst features in the Aptian carbonates of the Barra Velha Formation in a pilot area of the Santos Basin, Brazil. Multiple seismic attributes were used to enhance details on the seismic data and highlight key seismic parameters including strata deformation and geometry, continuity of seismic events, and fault patterns. The study found that karst structures are controlled by faults and fractures along structural highs, which served as a conduit for the flow of dynamic fluids that dissolved the carbonate materials. Several closed, circular depressions and bright spots identified in the northeastern portion of the study area represent possible sinkhole structures. Epigenic and hypogenic processes due to the action of meteoric water, hydrothermal activity, and intra-formation acidity along regional unconformities in the Barremian-Aptian may have been responsible for the dissolution. Limitations of this study are related to the difficulty of integrating multiple datasets with various scales. However, the higher confidence for the occurrence of the karst features is provided by borehole images at the sub-seismic scale. The findings of this study hold significant relevance for the strategic planning of energy development and carbon sequestration initiatives in the Brazilian continental margins, thereby aiding in informed decision-making.

Published
2023

27. Presalt Carbonate Cyclicity and Depositional Environment: A Combined Bhi and Nmr Approach to Markovian Cycles in the Barra Velha Formation (Santos Basin, Brazil)

Author

Soares, Marcus Vinícius Theodoro, primary, Bomfim, Letícia da Silva, additional, Vidal, Alexandre Campane, additional, Avansi, Michelle Chaves Kuroda, additional, Cunha, Oton Rubio, additional, García, Richard Guillermo Vásconez, additional, and Medeiros, Renato Sol de Paiva, additional

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results