Zeolites have been reported in petroleum and natural gas reservoirs of a wide range of geological ages from many parts of the world. Such zeolite-bearing oil and gas reservoirs are not comparatively large in number and scale. However, where present in petroleum and natural gas reservoirs, zeolites can have profound effects on the quality of the reservoirs, affecting rock porosity and permeability. Zeolite-containing reservoir rocks vary widely lithologically, including not only porous, pelitic sedimentary rocks, but also volcanogenic rocks and even fractured intrusive and plutonic rocks.

Several different genetic types of zeolite occurrences have been distinguished and classified (e.g. Hay...

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