郯庐断裂带苏鲁界地应力积累特征及地震危险性研究  

Stress accumulation characteristics and seismic hazard study in the junction of Jiangsu and Shandong Provinces of the Tanlu fault zone

作　　者：邱君[1,3] 吴满路 范桃园[1,2] 张重远 王连山[1,3] QIU Jun;WU Manlu;FAN Taoyuan;ZHANG Chongyuan;WANG Lianshan(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing,100081;Key Laboratory of Active Tectonics and Crustal Stability Assessment,Beijing,100081;The First Monitoring and Application Center,CEA,Tianjin,300180)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国地震局第一监测中心,天津300180 [3]活动构造与地壳稳定性评价重点实验室,北京100081

出　　处：《地质学报》2019年第12期3249-3258,共10页Acta Geologica Sinica

基　　金：中国地质调查局项目（编号DD20160270）;中国地震局第一监测中心主任基金项目（编号FMC2018008）资助成果

摘　　要：郯庐断裂带是中国东部重要的地质构造带和地震活动带,苏、鲁交界部位的地震活动性和强震危险性一直引人瞩目,1668年发生过郯城8.5级大地震。为了解郯庐断裂带苏鲁界现今地应力环境与地震发展趋势,应用水压致裂法在该区开展了一个钻孔的原地应力测量工作,同时参考前人利用钻孔崩落法与声发射法获取的中国大陆科学钻探(CCSD)主孔301~5047m深度范围内的地应力数据,揭示了研究区地应力状态。利用库伦破裂准则、Byerlee定律以及断层摩擦参数μ_m分析研究该地区的地应力积累水平,评估断层发生滑动的可能性。结果表明:水压致裂法测点在75.74~191.04m深度范围内最小水平主应力的量值为3.68~13.15MPa,最大水平主应力的量值为4.02~19.40MPa。CCSD主孔在1269~5047m深度范围内最小水平主应力的量值为25.3~122.0MPa,最大水平主应力的量值为41.4~166.4MPa;分析地应力结构,发现自地表至660m的范围内,σ_H>σ_h>σ_v,为逆断层地应力状态,660m以下表现为σ_H>σ_v>σ_h,为走滑断层地应力状态。综合分析断层摩擦参数μ_m,郯庐断裂带苏鲁交界处尚未达到断层失稳的临界地应力状态。The Tanlu fault zone is an important geotectonic belt and seismic activity belt in eastern China. The seismic activity and the risk of strong earthquakes at the junction of Jiangsu and Shandong provinces have been drawing much attention. The occurrence of tectonic earthquakes mainly lies in the geological tectonic movement, which is the contradiction between the in situ stress caused by this movement in the rock formation and the rock resistance. The earthquake is the result of the intensification of this contradiction. Applying the hydraulic fracturing method, a borehole in-situ stress measurement was carried out in this area. At the same time, referring to the data of in-situ stress in the depth of 301~5047 m of the main hole of the Chinese scientific drilling obtained by the predecessors using the method of borehole caving and acoustic emission, the in-situ stress state in the study area is revealed. Coulomb Criterion and Byerlee’s law and the fault friction parameters were used to analyze the accumulation of in situ stress and the possibility of fault slip in this area. In the preliminary results, hydraulic fracturing method is used to obtain the measuring points of Xinwangzhuang village in donghai county, jiangsu province that the magnitude of the measured maximum horizontal principal stress and minimum horizontal principal stress are 4.02~19.40 MPa and 3.68~13.51 MPa respectively in the depth range of 75.74~191.04 m. The measured value of the minimum horizontal principal stress at Maozhuang Village, Donghai County, Jiangsu Province, obtained by the method of borehole caving, is 25.3~122.0 MPa and the maximum horizontal principal stress is 41.4~166.4 MPa at the depth of 1069~5047 m. σ_H>σ_h>σ_v is the stress state of reverse fault in the range of 660 meters above the earth’s surface, and σ_H>σ_v>σ_h below 660 meters, which is the state of earth stress of strike-slip fault. Comprehensive analysis shows that the accumulation of in-situ stress in the study area is not high, and the fault slip is unlik

关 键 词：郯庐断裂带 地应力 应力场 断层滑动 地震危险性 

分 类 号：P31[天文地球—固体地球物理学]