OPTIMIZACIÓN DE LA METODOLOGÍA PARA EL CALCULO DE POROSIDAD A TRAVES DE SATURACIÓN DE FLUIDOS

Abstract

Porosity determination is a major labor in a petrophysical analysis laboratory, since the reservoir quality, the storage capacity (absolute porosity) and the productivity (effective porosity) depends (in great part) from this property. There are many proceedings to determine the effective porosity of a rock core sample in the API RP-40, one of them is the Fluid Saturation test. This test consist in the previous drying of a core sample, and then a complete brine saturation during 12 to 18 hours. The weight difference of the sample after and before the saturation process allows to calculate their effective porosity. This saturation time assures that all the porous spaces are filled with brine. However, this process could be more time-efficient. This work propose a 2-hours saturation methodology, which result can be adjusted to the proper time by a proposed correlation. This correlation were constructed by the porosity saturation measurement for three core samples of the Llanos Orientales Sedimentary Basin with both methodologies, and then calculated using STATGRAPHICS CENTURION XVI. The results indicate a successful estimation of the absolute porosity using the proposed correlation with a confidence interval of 98%, reducing the test time in approximately a ninth of the original time. Further works are required in order to check the validity of the correlation with different lithology

Keywords

• Petrophysics
• Porosity
• Saturation
• Experimental Design