天然气水合物垂直缆地震系统关键技术与试验

垂直缆地震（VCS）是构成天然气水合物立体化地震观测系统的观测手段之一。本文从天然气水合物调查及仪器设计角度出发，概述了国内外垂直缆地震发展动态，综合分析了天然气水合物垂直缆地震系统的关键技术，详细叙述了使用海底地震仪（OBS）模拟垂直缆地震系统的设计方式及海上采集试验。通过试验获取了天然气水合物立体探测地震数据，验证了应用超短基线技术（USBL）进行垂直缆水下定位的可行性，数据结果体现出了垂直缆地震相较于常规地震在数据质量上的优点，为垂直缆仪器研发、野外施工方法、数据采集等积累了经验。

Key Techniques and Experimental Study of Vertical Cable Seismic System for Gas Hydrate

Vertical cable seismic (VCS) is one of the acquisition methods that make up the multi-dimensional seismic exploration system for gas hydrate. In this paper, with the perspective of gas hydrate survey and instrument design, the development trends of VCS at home and abroad were summarized, a comprehensive analysis of the key technologies in the development of VCS system for gas hydrate was made, and the design methods for simulated VCS system by using ocean bottom seismographs (OBSs) as well as the offshore acquisition experiment were explained in detail. Based on the experiment, the multi-dimensional seismic data for gas hydrate was achieved and the feasibility of the application of ultra-short base line (USBL) in VCS positioning underwater was confirmed. The results indicate that the VCS method embodies the advantage in data quality compared with the conventional seismic acquisition methods. Based on this work a number of experiences for VCS system development, field operation and vertical cable data acquisition have been accumulated.