Complex structure of voids and low permeability of Eastern Siberia deposits - productive intervals of which are confined to Vendian and Lower Cambrian carbonate deposits - result in that the time of core samples extraction alone takes two-three months. Overall, low permeability of rocks cause prolonged time of all filtration experiments and experiments with rock satu- ration. Besides that, carbonate rocks often contain a significant amount of halite. Laboratory-based core studies on salt ex- traction from core samples indicated that void content of test samples might increase up to 30 % in absolute units, permeabil- ity might increase by 104 times. In this respect, it seems to be relevant to plan the laboratory studies of such rocks to mini- mize the time of sample interaction with water on the one hand and to obtain maximum information about filtration-volumetric characteristics of the sample on the other hand. One of the methods that can be used to obtain this information is laboratory determination of capillary pressure curves on the core samples. The present paper demonstrates the opportunity of build-up of the whole capillary pressure curve by edging point corresponding with residual water saturation.There were analyzed capillary pressure curves of samples belonging to Eastern Siberia complex structured car- bonate deposits, capillary pressure curves were obtained by the samples centrifuge method. It was detected that these curves are the function of the residual water saturation coefficient. There was suggested an algorithm of build-up of capillary pressure curves using residual water saturation. It was determined that for the section under research resistiv- ity index is not only a function of water saturation, but also of residual water saturation.