| Abstract |
Daghestan is a unique geothermal province, where local zones are widely distributed with abnormal high stratal pressure and temperatures. The territory of Daghestan surpasses all known sedimentary basins of the CIS in thermal intensity of bowels, except Kamchatka and Kuriles. Temperatures at depths of 3-6 km here are 140-210 0С, that 80-100 0С is higher than in Azerbaijan, the Astrakhan and Rostov regions, 40-60 0С is higher than in next Turkmenistan, Kazakhstan and the Stavropol crest, 90-120 0С is higher than in Tatarstan and Southern Ural /1/. Principal cause of high thermal intensity of a sedimentary mantle of Daghestan is presence in its section of thick aquifers distributing to the big depths. Thus the highest temperatures are marked in Terek - Kuma and Terek - Sulak depressions - fields Tarumovka, Jubilejnyj, Sukhokumsk, Kizlyar, Babajurt, Achi-Su, Tarki, Thernair. Productive horizons are presented by dolomite limestone of Triassic neftekumsk suite and Jurassic and Lower Cretaceous sandstone. Their thicknesses vary from 100 up to 400 m at depth of bedding 3800-5200 m. Here there are maximal output of wells (90 l/s), high stratal temperatures (190 0С) and pressures (60 MPa), and the highest in Northern Caucasus resources of low-salt heat power waters (80-100 0С). In a southern part of Daghestan where water-bearing complexes are spread in the top zone, temperatures at depths 3-5 km are approximately 40-50 0С lower than in Northern Daghestan. As one can see, Daghestan has huge geothermal potential. Specific thermal resources of separate thermal abnormal zones achieve 120-140 GJ/m2, and the area of such zones is 140-150 km2. The given fact in a combination with presence in sedimentary thickness of thick high-permeable strata and a large number of existing wells allow to realize in Daghestan the integrated systems of geothermal heat supply and geothermal power plants with capacity of hundreds megawatt |