甘肃省地热资源赋存特征及潜力评价

甘肃省地热资源丰富，其地热资源的开发利用具有较大的潜力。本文介绍了甘肃省地热资源分布概况，结合地区构造、地热水化学特征、地热资源量及开发利用现状探讨了甘肃隆起山地对流型与沉积盆地传导型地热资源的赋存特征，并对两种类型地热资源潜力进行了分析评价。结果表明，沉积盆地地热资源分布于河西、陇西及陇东盆地等，热储类型为裂隙型和孔隙型，热储层自元古宙至新生代均有发育，岩性以砂岩为主；隆起山地型地热资源主要分布于祁连山和西秦岭造山带，热储类型为断裂破碎带，岩性以花岗岩为主；通过潜力计算得知，全省热量开采系数≥0.4的仅占29.17%，表明目前甘肃地热资源开采程度较低，开采潜力较大。

Occurrence features of geothermal resources and geothermal potential assessment in Gansu Province

Gansu Province possesses rich geothermal resources, and the potential for geothermal resources development and utilization is great. In this paper, the distribution of geothermal resources in Gansu was presented, In combination with the regional geological structure, the chemical characteristics of geothermal water, and the current situation of development and utilization of geothermal resources, the authors investigated the occurrence characteristics of geothermal resources of sedimentation basin conduction type and apophysis mountain convective type, and estimated the potential of the two types of geothermal resources. The results show that sedimentation basin geothermal resources are distributed in Hexi, Longxi and Longdong basins, the thermal reservoirs are of pore-type and fissure-type, thermal reservoirs were developed from Proterozoic to Cenozoic, and the reservoirs are dominated by sandstone; the apophysis mountain geothermal resources are mainly distributed in Qilian Mountain and western Qinling orogenic belt, the thermal reservoir type is of fault ruptured zone, and the lithology mostly is granite. From the potential calculation of geothermal resource, the proportion of heat recovery coefficient of greater than 0.4 is simply 29.16% in Gansu, indicating that the geothermal resources in Gansu are in a low mining degree, and hence has great mining potential.