小道距高分辨率多道地震系统在渤海海峡地层探测中的应用  

The Application of High Resolution Multichannel Seismic System With Small Group Interval to Stratigraphic Exploration in Bohai Strait

作　　者：祁晓雨 QI Xiaoyu(China Railway Design Corporation,Tianjin 300251,China)

机构地区：[1]中国铁路设计集团有限公司,天津300251

出　　处：《海洋科学进展》2024年第4期807-815,共9页Advances in Marine Science

基　　金：中国铁路设计集团有限公司科技开发课题(2023A0226406)。

摘　　要：渤海海峡横亘于山东半岛和辽东半岛之间,建设一条横跨渤海海峡的跨海通道一直是人们的梦想。为查明渤海海峡拟建桥隧通道第四系沉积层厚度和断裂分布特征,在收集区域地质资料和前人研究的基础上,以大能量等离子体震源为发射源,结合小道距高分辨率地震电缆采集系统,进行了海域多道地震反射波法探测试验。首先通过海上试验,选择合适的震源能量和地震记录接收系统参数,以提高原始地震数据质量。再通过分析噪声特点及多次波发育情况,制定了一套适合于研究区的多道地震数据处理流程,最终获得的地震剖面具有较高的信噪比,能够清晰地反映渤海海峡区域的沉积地层展布和基岩起伏特征,其理论垂向分辨率优于1.0 m。本次探测结果为后期渤海海峡跨海通道的设计提供了参考依据。The Bohai Strait is located between the Liaodong Peninsula and the Shandong Peninsula,with the shortest distance of about 106 km from north to south along the strait.The trans-strait passage project has been under discussion for many years.In order to investigate the thickness of Quaternary sediments and fault distribution of the proposed trans-strait passage area of the Bohai Strait,we performed a multi-channel seismic reflection exploration survey in the sea area.Based on the experiments of comparing different source of energy,such as 1000 J,2000 J,3000 J,4000 J and 5000 J,the field acquisition parameters were determined.The multi-channel seismic acquisition system includes an electrical sparker with a maximum energy is 5000 J,and a 24 channel seismic streamer with a group interval of 3.125 m.In order to eliminate noise and multiples,a set of seismic data processing methods suitable for the study area was determined,and a high-resolution seismic profile was obtained with a resolution better than 1.0 m.This data can provide a reference for subsequent geological interpretation and geological suggestions for the construction of the trans-strait passage project.

关 键 词：渤海海峡 跨海通道 多道地震 高分辨率 

分 类 号：P715[天文地球—海洋科学] P738