The observational data of radon and 12 items of four precursory digital stations in Qinghai province,the result shows that there are some anomalies,but not obviously tendency ones,before the earthquake with M s8 1 on Nov.14,2001.And the digital geotherm data in Ge'ermu are observed the coseismic effect
Finally, we evaluate terrestrial heat resource and choose the potential development areas of terrestrial heat resource. The followings are the results of this research: W4、 W6、 W8、 W12 in Jizhaoshan and W16、 W20、 W21 in Anbian, the drilling depth is about 1000m-1200m.
The geothermal field is mainly controlled by the regional tectonic framework characterized by alternately upwarped and downwarped basement, and exhibits the characteristics of belted distribution with alternating high and low relief The geothermal gradient (G) and terrestrial heat flow velue (Q) of the Cenodoic sedimentary cover are relatively high in the upwarped area, with G=3.5-5.0℃/100m and Q=63-84 mW/m~2;
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.
It is assumed that a layer of mantle matter, rising up or going down, enters a region of decompression (in which for a number of reasons the geotherm passes above the temperature of the solidus) and is subjected to partial fusion there.
In basaltic composition, CaCO3 (calcite and aragonite), the major carbonate phase in marine sediments, is altered into MgCO3 (magnesite) via reactions with Mg-bearing silicates under conditions that are 200-300°C colder than the mantle geotherm.
Furthermore, CO2 itself breaks down to diamond and oxygen under geotherm conditions over 70?GPa, which might imply a possible mechanism for diamond formation in the lower mantle.
Temperature is an important factor affecting seismic velocity, and terrestrial heat flow is the most direct indication of temperature distribution of the lithosphere.
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].