Tight gas is natural gas produced from reservoir rocks with such low permeability that massive hydraulic fracturing is necessary to produce the well at economic rates. Tight gas reservoirs are generally defined as having less than 0.1 millidarcy (mD) matrix permeability and less than ten percent matrix porosity. Although shales have low permeabili...
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http://en.wikipedia.org/wiki/Tight_gas
(from the article `natural gas`) Tight gas occurs in either blanket or lenticular sandstones that have an effective permeability of less than 1 millidarcy (or 0.001 darcy, which is ...
Found on
http://www.britannica.com/eb/a-z/t/49
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