Chemical and Physical Analysis of Sandstone Rock From Botucatu Formation

Abstract

The productive capacity of the Guarani Aquifer System is subject to variations along its length, due to its complex structural and compositional heterogeneity. Several parameters may influence the quality of this reservoir rock, such as its mineralogical and textural constitution, as well as the physicochemical processes, since its diagenesis is not the same throughout the aquifer, influencing the water productivity in wells in different locations. Such parameters are useful in the geoscience studies for the elaboration of diagenetic models for the prediction of the reservoir quality. In this work, several properties of the sandstone rock from Botucatu Formation were determined using different techniques, such as geotechnical tests, optical microscopy (MO), electron scanning microscopy (SEM), X-ray Fluorescence and X-ray diffraction. The results indicate that the studied sandstones have characteristics of the reservoir rocks, with potential for water storage.

Pantanal Basin river muds from source to sink: compositional changes in a tropical back-bulge depozone

“…The Mesozoic Botucatu Formation in the plateau provenance region is an aeolian sandstone with amorphous silica, pore-filling, and kaolinite and smectite grain coatings (França et al, 2003;Hirata et al, 2011;Bertolini et al, 2020;. The Mesozoic Era was characterized by hothouse conditions (Holz, 2015) followed by diagenetic processes that contributed to the generation of kaolinite in the Botucatu Formation (Corrêa et al, 2021). This formation may have contributed an unknown amount of inherited kaolinite to the silt plus clay fraction recovered in modern river samples (Balan et al, 2007).…”