浙江省区域地质背景及地热资源赋存特征

介绍了浙江省地热资源概况,结合浙江省区域地质背景探讨其地热资源赋存特征。浙江位于我国东部薄壳地带,莫霍面的起伏控制着省内大地热流值的分布趋势,省内地热井(泉)多分布于莫霍面埋深浅且热流值高的地区。省内断裂构造十分发育,为深部岩层的富水及导热创造了良好的条件。以江山-绍兴深大断裂为界,浙西北地区地热资源以沉积盆地型为主,热储岩性主要为灰岩、砂岩,热储类型为上部孔隙型下部岩溶型层状,其褶皱山区则为隆起山地型,热储类型为岩溶型层状兼带状;浙东南地区主要为大面积的丘陵山区,地热资源类型以隆起山地型为主,热储岩性主要为岩浆岩、火山岩,热储类型为裂隙型带状。浙江省热水主要为偏硅酸-氟热矿水,受赋存环境影响,浙东南地热水偏硅酸、氟、氡等含量普遍高于浙西北。

The Regional Geological Background and Occurrence Characteristics of Geothermal Resources in Zhejiang Province

The general situation of the geothermal resources has been introduced, and the occurrence characteristics of the geothermal resources also be investigated by studying on the regional geological background of Zhejiang province. Zhejiang province locates in the thin earth crust zone in east China, the Moho surface controls the distribution of the heat flow values, and the geothermal points all locate in the areas having higher heat flow value and shallower buried depth of Moho. There are many faults and structures developing in Zhejiang province, which create better conditions for the occurrence and transmitting heat for the deep groundwater. Bounded by the Jiangshan-Shaoxing deep fracture, in the Northwest Zhejiang, the geothermal resource type is mainly sedimentation basin type, thermal reservoir lithology is limestone or sandstone, the geothermal reservoir type is karst stratiform and zonal type. Furthermore, in folded mountain areas in the Northwest Zhejiang, the geothermal resources type is apophysis mountain type. As a comparison, in the Southeast Zhejiang, the geothermal resources type is mainly apophysis mountain type, thermal reservoir lithology is volcanic or magmatite, and the geothermal reservoir type is fissure zonal type. The thermal waters in Zhejiang are rich in H2SiO3 and F, influenced by the preserving environment, the thermal waters in the Southeast Zhejiang have higher H2SiO3, F, Rn etc. than which in the Northwest Zhejiang.