摘要
地热资源在未来的能源结构中具有重要地位,为分析云南省洱源县地热资源分布的构造控制因素,文章通过野外地质调查对县域内多条重点断裂进行了野外露头观测和分析,对不同断裂类型两盘受力情况进行计算和分析,并通过三维立体图形对县域内断裂与地热分布进行了展示,结果表明:洱源县域内发育多条大型断裂带,走向以NW−SE向为主,具有多期构造活动,具“压扭性”或“张扭性”特征,并被后期张性断层切割改造;正断层下盘及逆断层上盘具有更大的正应力值和剪应力值,多发育牵引背斜,更容易发育裂缝;断裂构造对温泉的控制作用明显,其中大型走滑断裂可沟通深部热源,温泉热水可沿后期张性断裂发生地下径流,然后可在断裂附近的裂缝发育带、断裂交汇处以及断层尖灭处聚集区,在海拔及第四系等多因素综合影响下,热水出露地表形成温泉。
As a kind of green and clean energy,geothermal resources are new and renewable and play an important role in the future energy frame.Due to the unique tectonic location and intense fault activities,there exist favorable geological conditions for the formation and flow of geothermal water in Yunnan Province,especially in its western area,so geothermal resources are very rich.In order to analyze the structural factors of the distribution of geothermal resources in Eryuan county,Yunnan Province,this study focuses on two basic topics of the structural characteristics and fracture development mechanism of the key fault zones in Eryuan county,and selects several hot springs as research objects in Sanying town,etc.Through field geological surveys,this study calculates the stress-strain properties of different faults and predicts the fracture distribution under the background of different faults and multiple fault combinations,based on which a three-dimensional spatial model of the fault structures and hot springs in the study area has been established,showing the spatial relationship between the faults and geothermal energy in the county.The study results on the faults show that there are many large fault zones developed in Eryuan county,mainly including Weixi-Qiaohou fault,Longpan-Qiaohou fault,Luopingshan fault,Heqing-Eryuan fault,Nandaping fault,Beipai-Zhengshengcun fault,etc.The fault trend is mainly NW-SE,with characteristics of multi-stage tectonic activity.Many scratches,steps and structural breccia can be found in the field,with obvious"compression-torsional"or"tension-torsional"characteristics.Several faults are cut and transformed by late tensile faults,and have typical"flower structure"on the cross sections.On the plane,the tectonic deformation in the west of the Beipai-Zhengshengcun fault is mainly ductile-brittle deformation in early tectonic uplift period.The area to the east of this fault is mainly brittle deformation,and the Neo-tectonic movement is manifested by obvious tectonic performance.The theoreti
作者
金文正
JIN Wenzheng(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering,Beijing 100083,China)
出处
《中国岩溶》
CAS
CSCD
北大核心
2024年第1期57-71,共15页
Carsologica Sinica
基金
云南省科技计划项目“云南省中深层地热能开发利用关键技术研究”(202302AF080001)
国家自然科学基金项目“龙门山冲断带构造分段变形机制研究”(41002072)。
关键词
断裂
裂缝
应力
地热
洱源
fault
fracture
stress
geothermy
Eryuan county
