地震勘探技术在郯庐断裂带桐城段深部构造特征研究中的应用  

Application of Seismic Exploration Technology to Deep Structural Features of Tongcheng Section in the Tanlu Fault Zone

作　　者：熊强青 陈耀 李云峰[2] 袁兴赋 喻兵良 谭静[1] 陈杰 郭南舟 李旭东 Xiong Qiangqing;Chen Yao;Li Yunfeng;Yuan Xingfu;Yu Bingliang;Tan Jing;Chen Jie;Guo Nanzhou;Li Xudong(Geological Exploration Technology Institute of Anhui Province,Hefei Anhui 230001,China;Nanjing Geological Survey Institute,China Geological Survey,Nanjing Jiangsu 210016,China)

机构地区：[1]安徽省勘查技术院,安徽合肥230001 [2]中国地质调查局南京地质调查中心,江苏南京210016

出　　处：《工程地球物理学报》2019年第4期423-432,共10页Chinese Journal of Engineering Geophysics

摘　　要：为获取郯庐断裂带安徽桐城段构造复杂区高信噪比地震资料和高质量地震剖面,以了解其地质构造稳定性特征,通过部署20 km长的二维地震剖面,初步探索出一套适用于郯庐断裂带复杂构造地区地震资料采集的方法技术,并取得了较好的成果剖面。结果表明:在郯庐断裂带安徽桐城段丘陵地区和平原地区需采用合适的采集方法,在丘陵山地有效井深和药量分别为9~12 m和3~5 kg,在平原地带有效井深和药量分别为7~9 m和2~3 kg;测线主要穿过丘陵地区,目的层较深,反射波频率较低,采用低频(10 Hz)检波器更有利于地震波采集。从试验处理的剖面看,最终成果剖面获得预期的信噪比和分辨率,目的层地震波组特征明显,同相轴连续性好,地质现象清楚。解释成果认为郯庐断裂带桐城段中生代早期区域构造主要受挤压应力作用所控制,中生代晚期区域构造主要受拉张应力作用所控制,古近纪以来郯庐断裂带仍处于活动之中。In order to obtain high-signal-to-noise ratio seismic data and high-quality seismic profiles in the Tongcheng sector of the Tan-Lu fault zone in Anhui Province and understand the geological structural stability characteristics,by deploying a 20-kilometer-long two-dimensional seismic section,a set of method which is suitable for the seismic data acquisition in the complex tectonic area of the Tanlu fault zone has been initially explored,and a good result profile has been achieved.The results show that the appropriate collection method should be adopted in the hilly area and plain area of the Tongcheng sector.The effective well depth and the dose in the hilly area are 9~12 m and 3~5kg respectively,and the effective well depth and dose in the plain area are respectively 7~9 m and 2~3 kg;the line mainly passes through the hilly area,the target layer is deep,and the reflected wave frequency is low.The low frequency(10 Hz)detector is more conducive to seismic wave acquisition.From the cross section of the experimental treatment,the final result profile obtained the expected signal-to-noise ratio and resolution.The characteristics of the target layer seismic wave group are obvious,the continuity of the same phase axis is good,and the geological phenomenon is clear.The results of the interpretation suggest that the early Mesozoic tectonic structure of the Tongcheng sector is mainly controlled by the compressive stress.The late Mesozoic tectonic structure is mainly controlled by tensile stress,and the Tan-Lu fault zone is still active since the Paleogene.

关 键 词：郯庐断裂带 桐城 二维地震勘探 采集方法试验 构造稳定性 

分 类 号：P631.4[天文地球—地质矿产勘探]