Carbonate coquinas are sedimentary rocks composed mainly of shells and fragments. They present different texture characteristics that are affected by sedimentation and diagenesis, influencing the pore arrangement and, consequently, the permeability. It is necessary to understand the effect of variations in effective stresses on these rock formations and how mechanical damage problems will affect the production and injection of wells in oil and gas production systems. In this thesis, samples of synthetic coquinas were made, and with the help of x-ray microtomography, pore network modeling techniques, and in situ tests, the influence of the microstructure of these rocks on the variation of their properties due to confined compression stresses was evaluated. The use of x-ray microtomography allowed the analysis of the samples internal structure for the discrimination of pores. Using a cell for mechanical tests, coupled with the tomograph and able to apply confined compressive stresses, helped study changes in the coquinas’ microstructure under tension. The samples were scanned under three conditions: without loading, with stress loading, and after depressurization. Pore network modeling was used to simulate single-phase transport in the coquinas, as well as for relating data such as pore connectivity number, tortuosity, permeability, porosity, pore, and capillary diameter. The results obtained demonstrate that the application of confined compressive stresses results in the reduction of porosity and permeability of the coquinas. The reduction of total porosity in the final stage relative to the initial conditions of the samples was 87.5 percent, 70.0 percent, and 85.9 percent for CP1, CP2, and CP3, respectively. Meanwhile, the absolute permeability under initial conditions presented values of 33.10, 11.60, and 22.90 mD for CP1, CP2, and CP3, respectively, which reduced to zero with the increase of pressure stages, making it impossible for the coquinas to permeate fluids within their interiors. Compared to literature studies, the production of synthetic coquinas proved to be efficient in terms of reproducibility for authentic carbonate coquinas, presenting similar geomechanical properties.