摘要
干热岩是潜力巨大的可再生能源,通过建立EGS试验场地开展干热岩资源开发示范工程是我国开发深部地热的前沿性、基础性工作。地壳深部温度是干热岩开发选址中首先考虑的因素,在重新编制中国大地热流图、居里面深度图的基础上,建立了东南沿海地区和青藏铁路沿线地区2个典型干热岩资源潜力区三维温度场模型,在不考虑热对流的情况下,模拟结果显示东南沿海4km深处的最高温度能达到165℃,青藏铁路沿线地区4km深处最高温度可达到380℃。同时,对比模拟结果和前人实测数据,分析了2个研究区不同的热成因机制,东南沿海地区以壳源产热为主,漳州地热田放射性集中层厚度10km,幔源热流所占比例为39.6%,青藏铁路沿线地区以幔源传导热为主,羊八井地热田放射性集中层厚度为6km,幔源热流所占比例为53.7%。通过与文献结果对比分析了模拟结果的合理性,模拟结果能够为我国干热岩靶区选址提供参考。
Hot dry rock as a new kind of alternative resources which can be developed based on the establishment of enhanced geothermal system（EGS）has been confirmed to be tremendous in total amount.The demonstration project is urgent both for our forefront and basic work.As in all of the other EGS projects,geothermal reservoir temperature should be considered before any other factors.The three dimensional temperature models were established in target demonstration area based on the new terrestrial heat flow and depth of Curie interface map.The result shows at the depth of 4km,165℃ can be reached in the southeast coast of China and 380℃ could be reached at the same depth in the area nearby Qinghai-Tibet Railway.The simulation results and measured data were compared to illustrate the different heat formation mechanisms of the two areas.Zhangzhou in the southeast coast of China presents the major crust heat production with the thickness of radioactive concentration layer reaching 10 km,and mantle heat occupying 39.6%in the total heat flow.In contrast,Yangbajing which lies nearby the Qinghai-Tibet Railway shows more mantle heat flow which could occupy 53.7%in the whole heat flow with the thickness of radioactive concentration layer reaching 6km.The result of the model has a higher consistency with the historical testing and so the data could be used as the reference of EGS project site selection.
出处
《地质科技情报》
CAS
CSCD
北大核心
2015年第6期176-181,共6页
Geological Science and Technology Information
基金
中国地质科学院水文地质环境地质研究所项目(SK201212)
中国地质调查局地质调查项目(12120113077900)
关键词
干热岩
热结构
居里面
大地热流
hot dry rock
geothermal structure
depth of Curie interface
terrestrial heat flow
