青海祁连县地热开发与环境评价研究

An Exploration on Geothermal Resources and Environmental Assessment in Qilian County of Qinghai Province

祁连县是青海省重要的高原生态旅游地,具有北接河西走廊,南连环湖过境通道的区位优势,在全省"一圈三线"旅游战略布局中处于"北线"的核心位置,是青海的重要交通枢纽和对外开放的重要门户。通过地热地质钻探、抽(放)水试验、化验分析,取得热储结构参数和化学组分等,分析勘查区祁连县地热构造特征为受断裂构造控制的对流型Ⅱ-3型中低温地热田,兼有层状热储和带状热储特征,对该区的地下热水资源做出评价。根据区域水文地质资料及本次调查成果,通过该处钾镁地热温标计算,热储温度70.79℃,该处地热井水温可以大于50℃,区内构造破裂带脉状水构成了富水带,泉流量一般1~3 L/s,因此地热井水量有望达到500 m^3/d,进而指导祁连县的城镇规划,服务当地旅游及社会经济发展,以达到绿色勘查的目的。

Qilian County in Qinghai province is an important ecological tourist destination. It is located in northern Hexi Corridor,South Lake chain crossing location with ＂ three circle line＂ tourism strategic layout in ＂ north line＂ of core position is an important gateway to an important traffic hub in Qinghai. I think its tourism resources is of development potential. The proposed County of Qilian City in geothermal resources exploration of feasibility will be in geothermal and geological drilling with pumping test,including water test,heat reservoir structure parameters and chemical composition. The exploration area of Qilian County will be taken as the tectonic characteristics of geothermal convection type II controlled by fracture structure of Ⅱ-3 type in low temperature geothermal field. It makes evaluation of underground water resources in the area according to regional hydrological data and the survey results. Through the calculation of potassium magnesium geo-thermometer,heat storage temperature will be 70.79℃. Geothermal water temperature can be higher than 50℃ with tectonic fracture zone constit-utes a rich vein water hose. Spring flow is generally 1 ~ 3 L/s. Geothermal well water is expected to reach 500 m^3/d. Then,we can guide the urban planning in Qilian County to sere the local tourism and social economic development to achieve the purpose of green exploration.