复杂城区地层结构及周边隐伏断层探测研究——以东湖高新区为例  

Detection of Stratigraphic Structure and Surrounding Buried Faults in Complex Urban Areas:Case Study of East Lake High-tech Zone

作　　者：常坤 邓小虎 程邈 CHANG Kun;DENG Xiaohu;CHENG Miao(China Oilfield Services Ltd.Geophysical Research Institute,Tianjin 30045,China;Wuhan Institute of Earthquake Engineering Co.,Ltd.,Wuhan 430071,China)

机构地区：[1]中海油田服务股份有限公司物探事业部物探研究院,天津300459 [2]武汉地震工程研究院有限公司,武汉430060

出　　处：《CT理论与应用研究(中英文)》2025年第2期217-224,共8页Computerized Tomography Theory and Applications

摘　　要：复杂城区地层结构特征、隐伏断层位置、几何特征以及覆盖层厚度等地质信息对于轻轨、城际列车等重大工程建设显得极其重要。利用浅层地震反射波法可初步查明隐伏断裂走向、倾向、上断点埋深等几何特征,并可精细划分地层,获取覆盖层厚度等信息,但在城区部分区域无法采用可控震源车实施地震勘探作业,因此无法实现复杂城区地层结构及隐伏断层的探测研究。针对复杂城区面临的现实难题,本文将地震反射和微动探测两种方法引入城市隐伏断层和地层结构探测。在反射地震勘探盲区利用微动探测获取的速度结构实现城区地下空间结构的透视,帮助判断覆盖层厚度、强风化及中风化基岩埋深等信息,并结合钻孔资料对目标区覆盖层厚度、隐伏断裂和地层结构进行分析,有效避免城市探测盲区,实现全区域、多手段联合探测。该技术组合为类似城市开展复杂城区地球物理工作提供新思路,具有较好的科学意义和推广价值。Geological information such as stratigraphic structure characteristics,location of hidden faults,geometric characteristics,and overburden thickness in complex urban areas is extremely important for major engineering constructions such as light rail and intercity trains.The shallow seismic reflection method can identify the geometric features of concealed faults,including their strike as well as the dip and buried depth of the upper breakpoint;additionally,it can finely delineate strata and obtain information regarding the overburden thickness.However,using vibroseis vehicles for seismic exploration in urban areas is unfeasible,thus rendering it impossible to investigate the detection of complex urban stratum structures and concealed faults.To address the practical challenges encountered in complex urban environments,seismic reflection is used and microtremor detection is performed in this study to investigate concealed faults and stratum structures in cities.By utilizing the velocity structure obtained from microtremor detection in the blind spots of seismic exploration,we can obtain insights into the underground spatial structure of urban areas,thus facilitating the assessment of the overburden thickness,the depth of highly weathered and moderately weathered bedrock,and other information.Additionally,by combining drilling data,we analyze the overburden thickness,concealed faults,and stratum structures in the target area,thus effectively avoiding urban detection blind spots and realizing entire-region and multimeans detection.This combination of technologies provides new ideas for conducting geophysical work in similar cities,thus offering scientific significance and promotional value.

关 键 词：地震反射 微动探测 地层结构 隐伏断裂 东湖高新区 

分 类 号：P315[天文地球—地震学] P65[天文地球—固体地球物理学] P631[天文地球—地球物理学]