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Crude oil production from unconventional sources has increased greatly in recent times, being now one of the most important sources of energy in the world, especially in the United States, where there are 48 currently operating reservoirs of “shale plays” type (Fig. 1). This is due to the favorable geological conditions of occurrence of these reservoirs, as well as using highly developed technology. The success of oil production from shale on the American continent has contributed to the increase of the interest in this type of reservoirs in other countries, including Poland. Prospective areas of the occurrence of accumulations of hydrocarbons in shale rocks extend through entire Poland from NW to SE in the Ordovician-Silurian pool. Nevertheless, the interest of geologists is focused also on the Outer Carpathians. Krosno beds that occur there are characterized by alternating sandstone-shale packages of low petrophysical properties. These layers can be considered as potential unconventional hydrocarbons resource. This work summarizes the four US geological formations treated as unconventional crude oil reservoirs. These are the Eagle Ford, Bakken, Avalon & Bone Springs and Monterey. The geological conditions of occurrence of these formations are compared with the terms of Krosno beds.

The comparison of geological conditions of American unconventional oil fields and Krosno beds