中国东北地区地热资源及热结构分析

在我国东北地区，盆地的热流高而在山区和地台区（额尔古纳和佳木斯地台）热流较低，通过对该区的研究发现，在地壳和上地幔中莫霍面埋深，高导层埋深和热流值之间存在着密切的联系，通过对该区热流数据分析我们可以得到这样的结论：该区的地壳和上地幔的热结构引起了热流分布的变化。计算结果还表明，该区地台的地幔热流，地壳中10km以下和10km以上的热流对地表热流的贡献不同。该区松辽盆地中广泛分布着传导型中低温地热资源，对松辽盆地地热资源的开发利用有着广泛的前景。最后结合已有的地质和物探资料，还给出了长白山天池火山地区长白温泉地热系统的概念性模型。

GEOTHERMAL RESOURCE AND THERMAIL STRUCTURE IN NORTHEASTERN CHINA

In Northeastern China, the heat flow values are higher in basins but lower in mountains and old terrain like Erguna and Jiamusi Terrain. Moho depth within the crust and upper mantle, high conductivity layer depth and heat flow values have close relations. By the study of heat flow distribution in this area, it is concluded that the differences in geothermal structure of the crust and upper mantle can cause the change in heat flow distribution among the terrains in the area. According to the calculated results, it is a fact that mantle heat flow and the stratum 10km above or below in the crust in every terrain has different contributions to the surface heat flow. Geothermal resources in low-medium temperature geothermal systems of conductive type are mainly occurred in large-scale sedimentary basins, such as Songliao basin. Investigation and exploration demonstrate that Songliao basin is a most promising area for development of low-medium temperature geothermal resources. Combined with the known geological and geophysical data, the geothermal system structure model of the Changbai hot spring is established.