This work presents a petrographic and diagenetic study of the Bauru Group sandstones. Core samples were collected from a 250m-deep well located in the City of Pirapozinho, southwestern region of State of São Paulo. Optical and scanning electron microscopy were applied to these studies. The detrital composition of these sandstones is constituted essentially by quartz and feldspars and in minor amounts by rock fragments and accessory minerals. The sandstones of Bauru Group underwent eodiagenesis. The main diagenetic processes identified are: dissolution of heavy minerals, rock fragments and aluminossilicate mineral; microcrystalline calcite cementation; formation of clay minerals; poikilotopic calcite cementation; and zeolite cementation.
Petrography; diagenesis; Bauru Group
