青海共和盆地干热岩勘查进展及开发技术探讨

我国干热岩勘查及开发利用仍处于起步阶段，亟待解决勘查程度底、热源机制不清、高温钻井成本高、换热效率低和压裂时有诱发地震风险等问题。在分析国内外干热岩勘查开发历程和青海共和盆地干热岩地质特征与勘查现状的基础上，探讨和研究了干热岩找矿标志建立、井内测温及地温梯度计算相关注意事项和共和盆地放射性生热对干热岩热源的贡献，初步分析对比了增强型地热系统与单井换热的各自特点及难点，分析了压裂井网技术存在的问题及压裂与诱发地震的关系，并对开发试验示范基地建设提出了相应的建议。研究结果为共和盆地干热岩勘查开发提供了理论依据。 

Progress in Hot Dry Rock Exploration and a Discussion on Development Technology in the Gonghe Basin of Qinghai

Due to the fact that exploration, development and utilization of hot dry rock for geothermal energy in China are still in their initial stage, it is necessary to overcome problems such as low levels of exploration, unclear heat source mechanism, the high cost of high-temperature drilling, the low efficiency of heat transfer technology and risks of induced earthquakes, etc. On the basis of analyzing the exploration and development history of hot dry rock at home and abroad, the geological features and current exploration situation of hot dry rock in the Gonghe Basin, this paper discusses and studies establishes the prospecting indicators of dry hot rock. This paper takes into consideration well temperature measurement and geothermal gradient calculation, and the contribution of radioactive heat generation to the dry hot rock heat source in the Gonghe Basin. It then preliminarily analyzes and compares the features and difficulties of enhanced geothermal system (EGS) and single well heat transfer. It also analyzes the problems in fracturing well pattern technology and the relationship between fracturing and induced earthquake, and puts forward some suggestions for the construction of development test demonstration base. The result has provided a theoretical basis for exploration and development of hot dry rock in the Gonghe Basin.