Unconventional gas resources refer to natural gas reserves in the tight sands or carbonates, shales, and in coals. There are many factors that differentiate these unconventional reservoirs from the conventional reservoirs. Unlike conventional reservoirs, unconventional reservoirs have large areal extent, not easily accessible, have significantly high development cost, and are characterized by extremely low flow capacity and high in-situ stress conditions. To produce from vast geographical areas requires drilling significantly large number of wells to achieve a large reservoir contact.

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