For a long time past,because of the limitation of the knowledge about the geothermal resources,people only paid attention to geothermal anomalous areas,where geothermal gradients are higher than 3.5 ℃/100 m or terrestrial heat flow value are higher than 62 mW/m 2.Therefore,the geothermal resources of geothermal anomalous areas have been largly developed,while the geothermalresources of nongeothermal anomalous areas have not yet been developed.
(2) in the hot dry rock geothermal energy extraction system , the temperature of wall rock mainly trend to descend , the temperature vary on the logarithm rule (y=-29. 559Ln(x)+385. 13) nearby the production well, but on the linearity rule (y = -20.339x+573. 13) nearby the injection well.
Combined with the sedimentary burial history and basin geothermal history, the modeling of carbon isotope kinetics provides a new and effective means for the determination of the origin and accumulation history of natural gas pools.
The carbon isotopic characteristics of natural gas are not only affected by the gas source and maturity of the source rock, but also are related to the accumulation condition and geothermal gradient in a basin.
Several natural associations composed of thermophilic anaerobic bacteria capable of utilizing various cellulose materials at 60 ± 2°C and pH 6.0-7.0 were isolated from the sludge of Kamchatka geothermal springs.
Temperature is an important factor affecting seismic velocity, and terrestrial heat flow is the most direct indication of temperature distribution of the lithosphere.
It has higher resolution and greater depth penetration than the direct current method and is especially fit for geothermal energy exploration and low-and mid-level groundwater detection.
The problem under consideration is related to important engineering problems in hydrology, geothermy, as well as in the development of oil or gas fields [2-4, 5].