南海天然气水合物远景区海洋可控源电磁探测试验

发布时间：2018-04-30 00:41

本文选题：海洋可控源电磁法 + 天然气水合物　；参考：《地球物理学报》2016年07期

【摘要】：为了测试我国自主设计与研发的海洋可控源电磁仪器性能及其在水合物探测中的适用性,本文从海洋可控源电磁法基本原理出发,首先根据试验海域水合物地质特征,建立简化地电模型开展理论研究,确定海洋可控源电磁试验的技术方案;利用研发的海洋可控源电磁仪器,在南海天然气水合物远景区开展探测试验,首次获得了我国深水海域的海洋可控源电磁数据.通过对采集数据进行处理与反演,获得了试验剖面的海底电性结构模型,揭示了4号测点下方存在一个50m厚的高阻层,其电阻率为25Ωm、顶部埋深为181m,为该区天然气水合物调查提供了有价值的电性参考资料.研究结果表明,自主研发的海洋可控源电磁仪器性能达到了预期的设计指标,这标志着我国海洋可控源电磁探测技术向实用化进程迈出了重要一步.
[Abstract]:In order to test the performance of marine controllable source electromagnetic instrument designed and developed independently in China and its applicability in hydrate detection, this paper, based on the basic principle of ocean controlled source electromagnetic method, first of all, according to the geological characteristics of hydrate in the experimental sea area. To establish a simplified geoelectric model for theoretical research, to determine the technical scheme for electromagnetic test of marine controllable sources, and to carry out exploration tests in the South China Sea gas hydrate area by using the developed marine controllable source electromagnetic instruments, For the first time, the electromagnetic data of ocean controllable sources in the deep water of China are obtained for the first time. By processing and retrieving the collected data, a submarine electrical structure model of the test section is obtained, and it is revealed that there is a 50m thick high resistivity layer below the test point 4. The resistivity is 25 惟 m and the top buried depth is 181 m, which provides valuable electrical reference for gas hydrate investigation in this area. The results show that the performance of the independently developed marine controllable source electromagnetic instrument has reached the expected design target, which marks an important step towards the practical application of marine controllable source electromagnetic detection technology in China.
【作者单位】：中国地质大学(北京)地球物理与信息技术学院;地下信息探测技术与仪器教育部重点实验室和地质过程与矿产资源国家重点实验室;中国地质调查局广州海洋地质调查局;
【基金】：中国地质调查局项目(201100307) 国家自然科学基金重点项目(61531001) 国家科技部"863"课题(2009AA09A201,2012AA09A201)资助
【分类号】：P631.325

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