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The main attention of the article is focused on the porosity distribution of the unconsolidated part of various types of pressure ice ridges as a granular medium. The porosity estimate was obtained by processing records of the penetration rate of thermal drilling of ice ridges. The variability of the porosity of ice ridges caused by the action of gravity and the Archimedes force during ice ridge formation is analyzed. It is shown that the porosity distribution in the sails of first-year drifting ice ridges and ice ridges in the fast ice is approximately the same, but the keel porosity in the ice ridges of the fast ice is slightly shifted towards lower values. The porosity of the sail, the blocks of which are more elongated and thinner, is higher that the porosity of the sail composed of thicker ice blocks. The tendency to a decrease in the average porosity of the sail and keel of pressure ice ridges with the distance from the ice surface deep into the ice ridge is preserved with an increase in the age of the ice ridge, but becomes less pronounced.