地震CT探测技术在岩溶勘察中的测试应用  

Test and Application of Seismic CT Detection Technology in Karst Survey

作　　者：潘乐荀 董亚 任川 PAN Le-xun;DONG Ya;REN Chuan(Anhui Huizhou Geology Security Institute Co.,Ltd.,Hefei 230000,Anhui,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221000,Jiangsu,China)

机构地区：[1]安徽惠洲地质安全研究院股份有限公司,安徽合肥230000 [2]中国矿业大学资源与地球科学学院,江苏徐州221000

出　　处：《承德石油高等专科学校学报》2023年第3期56-61,76,共7页Journal of Chengde Petroleum College

摘　　要：为准确掌握工区范围内岩溶的发育情况及其速度响应特征。现场采用地震CT探测技术对某研究区内的地质体开展一孔激发、多孔接收的地震CT剖面的快速扫描,进一步对实测数据进行反演层析成像,最后通过孔间CT层析成像结果结合钻孔资料对测试成果进行综合地质分析与解释。结果表明:研究区浅部覆盖层及岩溶或溶蚀裂隙与下伏基岩之间存在明显的速度差异,其中浅部覆盖层及岩溶发育区速度值约在800~2 000 m/s,而下伏基岩速度普遍在3 000 m/s以上;通过采用一孔激发、多孔同时接收的观测系统,可大大降低现场施工时间,并可同步获取多组剖面数据并提高探测精度。基于一孔激发、多孔接收的地震CT探测技术在实际工程中具有一定的应用和参考价值。In order to accurately grasp the development of karst in the work area and its speed response characteristics,on-site seismic CT detection technology is used to scan the seismic CT profile of a geological body in a certain research area,and the measured data is further studied to get tomographic inversion.Finally,comprehensive geological analysis and interpretation of the test results are made by combining the cross-hole CT tomography results with borehole data.The results show that there are obvious velocity differences between shallow overburden,karst or dissolution fissures and underlying bedrock in the study area,among which the velocity values of shallow overburden and karst development area are about 800~2000 m/s,while the velocity of underlying bedrock is generally above 3000 m/s.By using the observation system of one hole excitation and multiple holes simultaneous reception,the site construction time can be greatly reduced,and multiple groups of profile data can be obtained synchronously,thus the detection accuracy is improved.Seismic CT detection technology based on one-hole excitation and multi-hole reception has certain application and reference value in practical engineering.

关 键 词：地震CT 岩溶勘察 一发多收 测试应用 

分 类 号：P631[天文地球—地质矿产勘探]