Abstract
The utilization of routine petrographic techniques such as thin section descriptions, images on scanning electronic microscope (SEM) and x-ray diffractometry (XRD) integrated with measurements of porosity and inferred permeability of different carbonate facies of the sedimentary basin Sao Jose do Itaborai had as main objective the comprehension of the porosity systems of carbonate rocks. Travertine carbonate (predominant), carbonate breccia and oolitic grainstone (minors) have extremely low porosities and absolute permeablity due to cementation and their predominantly chemical origin, presenting porosities smaller than 2.5% and permeability fractions of milidarcys. The integration of petrography with petrophysical results is essential to understand the porosity systems, mainly of calcareous rocks, and to proceed possible correlation with well logs and seismic. Key-Words: 1- Sao Jose do Itaborai basin 2 - Carbonate rocks 3 - Petrography 4 - Petrophysics.
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