Anuário do Instituto de Geociências | |
Análise Multiescalar de Atributos Sedimentares em Depósitos Fluviais Paleogênicos na Bacia de Volta Redonda, RJ. | |
关键词: fluvial deposits architecture; Volta Redonda Basin; Cenozoic.; | |
DOI : | |
来源: DOAJ |
【 摘 要 】
This study aims to perform a multi-scale analysis of the sedimentaryattributes presented by Paleogene fluvial deposits of the Volta Redonda Basin(Continental Rift of Southeastern Brazil), including the characterization of sedimentary facies, depositional architecture and petrographical features. The results from this study may be applied to the modelling of fluid behaviour insidefluvial reservoir-rocks. Among the studied deposits are the main aquifers of the sedimentary basins which compose the Continental Rift of Southeastern Brazil. The methodologic framework comprised: interpretation of an outcrop by using a photomosaic to the recognition of depositional architecture, emphasizing the stratigraphic surface hierarchy; facies characterization withvertical profiles; and petrographic analysis of selected samples. Two distinct facies associations were recognized, corresponding to Resende and Pinheiral formations. The Resende Formation deposits present a simple complexity heterogeneity style, with a wide lateral continuity. They are composed by decimetric layers of massive sandstones interbedded to clayey sandstones, showing a tabular geometry and few dozen-meters width. The contacts between these deposits are gradual. The Pinheiral Formation deposits present a medium omplexity heterogeneity style, exhibiting frequent truncation of architectural by decimetric and dozen-meters width sandy layerswith conglomeratic levels interbedded to thin pelitic intervals. These deposits present a extended lenticular geometry and irregular contacts. Microscopically, sandstones from Resende Formation present low porosity, related to the occurrence of clayey matrix resulted from feldspars alteration. The sandstones similar to reservoir patterns.
【 授权许可】
Unknown