地应力作用下鸭绿江断裂带活动对丹东五龙背地热温泉的影响初析  

Preliminary analysis of the influence of the activity in the Yalu River fault zone on the Wulongbei geothermal hot springs in Dandong under the action of crustal stress

作　　者：毛佳睿 马秀敏[1,2,3,4] 孙尧 姜景捷[1,2,3] 张文汇 MAO Jiarui;MA Xiumin;SUN Yao;JIANG Jingjie;ZHANG Wenhui(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Observation and Research Station of Crustal Stress and Strain in Beijing,Ministry of Natural Resources,Beijing 100081,China;Key Laboratory of In-situ Stress Measurement and Monitoring,China Geological Survey,Beijing 100081,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]自然资源部北京地壳应力应变野外科学观测研究站,北京100081 [3]自然资源部活动构造与地质安全重点实验室,北京100081 [4]北京科技大学土木与资源工程学院,北京100083 [5]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《地质力学学报》2023年第3期402-416,共15页Journal of Geomechanics

基　　金：中国地质调查局项目(DD20230249,DD20230014,DD20190546);中国地质科学院地质力学研究所基本科研业务费(DZLXJK202106)。

摘　　要：鸭绿江断裂带为郯庐断裂系的重要分支,现今构造活动强烈,沿断裂带出露温泉60余处,地热资源丰富。为查明断裂带南段五龙背地区的现今地应力状态和断层的活动性,研究断裂活动对温泉地热水体的控制作用和远期影响,采用水压致裂法对该区开展了12个测段的原位地应力测量。测量结果显示,在测段深度36.80~215.50 m范围内,最大、最小水平主应力及垂直主应力值(SH、Sh、Sv)分别为6.00~13.52 MPa、3.18~7.26 MPa和0.97~5.7 MPa,总体而言,3个主应力值呈现随深度的增加而逐渐增大的趋势,最大水平主应力方向以北东向为主;断裂带中段(198.60~207.80 m),主应力关系为SH>Sv>Sh,有利于走滑型活动,具有一定潜力的富水导水条件,断裂带上段(36.80~196.63 m)及下段(215.50 m),SH>Sh>Sv,有利于逆断层活动,热流通道纵向连续性欠佳,导水条件较差;根据现今应力场特征与断裂活动的关系推演,五龙背地区温泉水位下降可能是因为断裂在压应力作用下活动,导水系统空间受挤压逐渐缩小,其他方向径流排泄增多,导致温泉水源供给减少;基于库仑摩擦失稳理论,断裂带36.80~113.20 m深度范围内的地应力值达到了其活动需要的应力临界值下限,将来有可能发生错断活动,温泉地热水体的补给通道可能受到断裂活动的影响而发生改变。研究成果在断裂对温泉地热水体控制作用研究方面具有一定的理论意义,并积极探索了断裂带附近地应力测量在地热研究领域中的应用思路。The Yalu River fault zone is an essential branch of the Tanlu fault system with intense present-day tectonic activity.Over 60 hot springs are exposed along the fault zone with abundant geothermal resources.In order to find out the present-day crustal stress state and fault activity in the Wulongbei area of the southern section of the fault zone and to study the control and long-term influence of the fault activity on the geothermal water bodies of hot springs,in-situ stress measurements of 12 sections were carried out in the area by hydraulic fracturing method.The results showed that the maximum and minimum horizontal principal stresses(SH and Sh)range from 6.00 to 13.52 MPa and 3.18 to 7.26 MPa,respectively,in the depth range of 36.80–215.50 meters.In general,the three principal stresses showed an increasing trend with depth;in the middle section of the fracture zone(198.60–207.80 m),the three principal stress values meet the relation of SH>Sv>Sh,which is favorable to the strike-slip activity and has some potential for water-rich hydraulic conductivity,while the three principal stress values of the upper section(36.80–196.63 m)and lower section(215.50 m)accord with SH>Sh>Sv,which is favorable to the reverse fault activity,with poor longitudinal continuity of heat flow channels and poor hydraulic conductivity.Based on the present-day relationship between stress field characteristics and fault activity,it is deduced that the decline of the hot spring level in the Wulongbei area may be due to the fault activity under compressive stress,which gradually reduced the space of the hydraulic conductivity system by extrusion,causing the increase of discharge of runoff in other directions and the reduction of hot spring water supply.Based on the Coulomb frictional instability theory,the in-situ stress value in the depth range of 36.80–113.20 m in the fault zone reaches the lower limit of the critical stress value required for its activity.There is a possibility of dislocation in the future,and the fault activity ma

关 键 词：鸭绿江断裂带 水压致裂地应力测量 地应力状态 地热温泉 断层活动性 

分 类 号：P315.727[天文地球—地震学]