| 海底可控源电磁接收机及其水合物勘查应用 |
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| 引用本文： | 陈凯,景建恩,赵庆献,罗贤虎,涂广红,王猛.海底可控源电磁接收机及其水合物勘查应用[J].地球物理学报,2017,60(11):4262-4272. |
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| 作者姓名： | 陈凯 景建恩 赵庆献 罗贤虎 涂广红 王猛 |
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| 作者单位： | 1. 中国地质大学(北京), 北京 100083;2. 广州海洋地质调查局, 广州 510760;3. 地下信息探测技术与仪器教育部重点实验室, 北京 100083 |
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| 基金项目： | 中国地质调查局127工程项目（201100307）与十三五国家重点研发计划项目（2016YFC0303100）联合资助. |
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| 摘 要： | 海洋可控源电磁法在国外已成为海底天然气水合物调查的有效手段之一.为实现我国海域深水条件下水合物的海洋可控源电磁探测,本文从方法原理出发,采用低功耗嵌入式控制、前端低噪声斩波放大、高精度时间同步和水声通讯等技术,设计并开发了由承压舱、玻璃浮球、采集电路、电场与磁场传感器、姿态测量装置、声学释放器、USBL定位信标、测量臂、水泥块等部件组成的海底可控源电磁接收机,实现了海洋微弱电磁场信号的高精度采集.海底可控源电磁接收机具有高可靠性、低噪声、低功耗和低时漂的特点.利用研制的海底可控源电磁接收机,在琼东南海域进行水合物勘查,采集得到了可靠的人工源电磁场数据.通过数据处理及反演,获得了研究区海底的电阻率模型,结合地震资料,对高阻异常体进行推断解释,其结果为天然气水合物钻探井位布置提供了电性依据.
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| 关 键 词： | 海洋可控源电磁法 海底可控源电磁接收机 天然气水合物 琼东南盆地 |
| 收稿时间： | 2016-12-21 |
Ocean bottom EM receiver and application for gas-hydrate detection |
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| CHEN Kai,JING Jian-En,ZHAO Qing-Xian,LUO Xian-Hu,TU Guang-Hong,WANG Meng.Ocean bottom EM receiver and application for gas-hydrate detection[J].Chinese Journal of Geophysics,2017,60(11):4262-4272. |
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| Authors: | CHEN Kai JING Jian-En ZHAO Qing-Xian LUO Xian-Hu TU Guang-Hong WANG Meng |
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| Institution: | 1. China University of Geosciences, Beijing 100083, China;2. Guangzhou Marine Geological Survey, Guangzhou 510760, China;3. Key Laboratory of Geo-detection, Ministry of Education, Beijing 100083, China |
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| Abstract: | Marine CSEM (controlled source electromagnetic) method has become one of the effective methods for offshore gas-hydrate detection. In order to realize marine controlled source exploration of hydrate in deep waters of China, this paper focuses on the method principle, low-power embedded control, front-end low-noise chopping amplification, high-precision time synchronization and underwater acoustic communication which are used to design the marine controlled source EM receiver. An OBEM (ocean bottom EM) receiver is mainly composed of a pressure chamber, glass spheres, data logger, electric field and magnetic field sensor, attitude measuring device, acoustic release device, USBL positioning beacon, measuring arms, and anchor, and can achieve high-precision acquisition of marine weak electromagnetic field signal. The OBEM has high reliability, low noise, low power consumption and low time drift characteristics. The developed OBEM receivers were applied in the South China Sea area Qiongdongnan hydrate investigation task for CSEM data acquisition. Through data processing and inversion, the electrical model of the study seabed is obtained, and the seismic data are used to deduce the high impedance anomaly body, which provides electrical evidence for the drilling of the gas hydrate. |
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| Keywords: | Marine CSEM Ocean Bottom EM receiver Gas-Hydrate Qiongdongnan Basin |
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