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The structure of the emptiness space of the oil reservoir rocks has been studied using high-resolution electron microscopy methods. Particular attention is paid to unconventional oil and gas reservoirs, among which argillites are finely divided. In them, the share of the nano-emptiness space is much higher than in typical carbonate and terrigenous reservoirs. The presence of a significant number of nano-cracks, which are either a continuation of micro-cracks, or independent of them, is established. A certain amoun...