海底节点式时频双域电磁采集系统及试验

Benthic nodal time-frequency dual-domain electromagnetic acquisition system and test

国家"十三·五"科技创新规划明确要求建立保障国家能源安全和战略利益的技术体系,加强"深海、深地、深空、深蓝"等领域的战略高技术部署,研发海洋可控源电磁系统、加快深海探测技术研发具有重要意义。首先介绍海底节点时频双域电磁采集系统工作原理,然后详细阐述了该系统的电磁传感器、数据采集站、声学系统及框架设计,并对整体采集性能进行分析;最后通过测试验证了该系统的投放、信号采集、海底释放、回收等重要环节的性能特征。实际试验剖面解释结果与已知海底含气储层信息吻合,表明该系统具有实用性,初步达到了工业化应用水平,为推动中国海洋电磁勘探技术的工业化应用奠定了基础。

The 13th Five-Year Plan for scientific and technological innovation clearly requires the establishment of a technical system to safeguard national energy security and strategic interests,and the strengthening of strategic high-tech deployment in such fields as "Deep Sea,Deep Earth,Deep Space and Deep Blue".Also it is of great significance to research and develop controllable source electromagnetic system for accelerating the research and development of offshore exploration technology.This paper introduces the working principle of the time-frequency dual-domain electromagnetic acquisition system with seabed nodes,describes the electromagnetic sensor,data acquisition station,acoustic unit and framework,analyzes the overall acquisition performance of the system,and finally demonstrates the performances and characteristics of the key links,such as data delivery,signal acquisition,release and recovery of seabed nodes.The interpretation result of the test section is consistent with the transverse change of the electrical property of the known gas-bearing reservoir,proving the system applicable.The system is suitable for industrial application and lays a foundation for promoting the industrial application of marine electromagnetic exploration technology in China.