Gas in Geopressurized Zones
Another source of unconventional natural gas is geopressurized zones. Geopressurized zones form 3,000-7,600 meters (10,000-25,000 feet) below the Earth’s surface.
These zones form when layers of clay rapidly accumulate and compact on top of material that is more porous, such as sand or silt. Because the natural gas is forced out of the compressed clay, it is deposited under very high pressure into the sand, silt, or other absorbent material below.
Geopressurized zones are very difficult to mine, but they may contain a very high amount of natural gas. In the United States, most geopressurized zones have been found in the Gulf Coast region.
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