The Distribution Characteristics And Resource Evaluation Of Geothermal Reservoir In Kedong Town

Geothermal resources is an important renewable energy, compared with thetraditional coal, oil, natural gas and other fossil energy, geothermal energy has a clean,environmentally friendly, local access and other advantages. The objectives of thedevelopment and utilization of geothermal resources on aspects of energy shortagesituation, to achieve energy conservation will play a positive role in promoting.Songnen Basin is rich in geothermal resources, since the1990s, the Daqing City largehave been carrying out the work of the investigation and development of geothermalresources, after ten years of efforts, has made gratifying achievements. They havedeveloped in the low-temperature geothermal resources are widely used for heating,drizzle Liaoyang, plant breeding and drying areas, has made significant economic benefits.Kedong County is located in the northeast edge of the Songnen Basin sedimentaryMesozoic strata thickness greater than1000m geothermal resources in the area to findmore hope. River1well, the river well oil exploration wells data also confirmed thepossibility of the occurrence of underground hot water in the district. Census work ofgeothermal resources, it is in the vicinity of Kedong grams Dong-jin burial conditionsinitially identified the area of geothermal resources, the the estimated geothermal fieldgeothermal resources reserves, valuation area prospects for development and utilization ofgeothermal resources.In this paper, based on analysis of the research has been the outcome of theinformation to carry out Hangwei interpreter, geothermal geological survey work,geophysical exploration methods need find Qingshankou group, such as the Quantou thegeothermal reservoir Cretaceous and Jurassic Departmentlot of heat reservoir development,screening geothermal drilling targets, preferably a drilling well location and constructioncombination of exploration wells to provide access. Pumping test at the same time, thequality of the geothermal fluid analysis, dynamic monitoring of integrated exploration technical means to identify geothermal reservoir in irregular explore geothermal resourcesD+E class reserves, pointed out that the above block geothermal exploration,development and utilization prospects for gram East the County further exploration anddevelopment of geothermal resources planning to provide a basis for decision-making.The main conclusions of this paper are as follows:A geothermal field survey type Ⅱ-1type (layered geothermal reservoir geothermalfield reconnaissance type) is a low-temperature class. The boundary conditions ofgeothermal reservoir distribution unlimited boundary conditions. Grams heat1well toexpose the exploration of geothermal resources caprock485.74m above NenjiangFormation mudstone, insulation, drain, general conditions. The geothermal reservoir burialdepth of485.7~1296.7m the the Cretaceous Qingshankou group the Quantou geothermalreservoir, Permian metamorphic rocks at the top of fractured geothermal reservoir.Cumulative geothermal reservoir thickness of122.80m, including penetration greater thanthe the50MD geothermal reservoir cumulative thickness of44.7m. Geothermal reservoirtemperature of30to54°C, belongs to the warm water to warm the water level, thewellhead water temperature26°C grams heat1wells still water level below the wellhead46.62m. Drawdown20m Bay water279.84m~3/d; drawdown53.7m Inflow765.5m~3/d;drawdown69.92m Inflow1002.24m~3/d. Grams thermal well logging data projections,the district The average geothermal gradient in the distribution of parts of the geothermalreservoir geothermal gradient of3.035℃/100m. Average terrestrial heat flow value of1.247micro card/cm2· s. District main heat source is the heat source of the thermalconductivity of the deep Earth-mantle and lower crustal melting layer heat flow andupper crustal granite body heat superimposed coupling.2, district geothermal fluid chemical characteristics and depositional environmenthydrodynamic field. G hot wells geothermal fluid HCO3· CI-Na-type alkaline water,freshwater. Geothermal fluid cationic component of Na+-based. The anionic componentsHCO3and CI-based. Geothermal fluid is-12.4‰.3, the exploration geothermal field scale for medium. The total thermal storage heatthermal energy storage method was the exploration area of1.65×1014kcal, the recoveryrate of10%, recoverable energy reserves of1.65×1013kcal. The storage methodexploration of geothermal fluid storage capacity of1.87×109m~3, heat storage7.521013kcal.Calculated according to the average well spacing, the census district geothermal fluid Grade D mineable resource capacity of6489m~3/d, single well recoverable volume of721m~3/d. Guarantee in accordance with100-year mine life calculation can only heat for12.77MW.4grams heat1well has medical value "the boron fluoride" freshwater can be bathinginfirmary development; unfit easy drinking natural mineral development; not suitable fordirect consumption; the irrigation must pay attention to watering methods; can forfisheries water; grams heat1well in hot water for a non-corrosive, with hard sediments,sparkling water, not suitable for direct use boiler.5, the temperature of the geothermal reservoir in the area in the range of28≦t <54,belongs to the warm water-warm water level applies bath, greenhouses, aquaculture,agricultural irrigation. Hot well1geothermal fluid evaluation project, according toemission quality evaluation standard evaluation is a good grade.The exploration area ismore appropriate for the most economical development zone.