The main objective of this work is to study the compressibility of consolidated (deep waters) sandstones from the Sergipe basin at different effective stresses levels, as well as the reduction of porosity and permeability with rock depletion. Compressibilities (C), most used in petroleum geomechanics studies were obtained, at different effective stresses. Compressibility is an important input parameter in flow simulators for oil production forecasts.The well chosen for the study was BRSA-189A-SES (ANP nomenclature) located in Field P. The main reason for choosing this reservoir for the study was the availability of a robust rock core, with plug samples measuring 1.5 inches. Through mechanical tests, it was possible to reach the minimum geomechanical characterization of the analyzed sandstones. A comparison was made with some literature rocks, tested in the elastic regime, and with a numerical model built and simulated for the study (where it is also possible to obtain pore compressibility as an output parameter).Furthermore, a proposal was made to standardize the different nomenclatures presented in the literature, based on Zimmerman (1990) and Ferreira et al. (internal report, 2018). Finally, the samples were subjected to effective stress variation (DELTAsigma), while porosity (fi) and permeability (k) were measured, allowing to obtain the permeability variation, along the effective stress increment. A comparison was made with the exponents of the Kozeny-Carman type equations, which relate the permeability reduction to a decrease in porosity (Petunin, 2011).The study allowed the evolution in the understanding of the mechanical properties of the sandstones of the Sergipe basin, since other reservoirs of the same geological age will be exploited in the coming years, under conditions of high depletion, as well as water and gas injection. The mechanical characterization of the reservoir rock directs to a better management of the oil field s useful life.