Geothermal resources can be grouped into four categories: hydrothermal, geopressured
, hot dry rock, and magma.
certain "small producers") and to individuals who own a depletable interest in (1) certain domestic regulated natural gas, (2) domestic natural gas sold under certain fixed contracts, and (3) certain domestic natural gas produced from geopressured
In the lower forty-eight states of the United States, geopressured
brine and gas hydrates may offer as much as 335,000 quads, according to Holtberg and Hirsch (2003).
DOE is directed to establish a program of R&D, demonstration, and commercial application for geothermal energy production from oil and gas fields and from geopressured
According to Fleischmann, researchers believe they can extract electric power from most oil and gas fields by tapping geopressured
hot water, natural gas, and hot waste-water reservoirs.
Other geothermal resources such as co-produced hot water associated with oil and gas production and geopressured
resources should also be pursued as short-term options.
Monitoring local subsidence in areas of potential geopressured
fluid withdrawal, southwestern Louisiana.
In the case of "natural gas from geopressured
brine" (see Q 1256), the applicable percentage rate is 10%.
resources contain hot fluids under higher-than-normal pressures.