| MCSEM电磁场能流密度分布特征研究 |
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| 引用本文： | 邓明,景建恩,郭林燕,罗贤虎,黄建宇,陈凯,王猛,史心语.MCSEM电磁场能流密度分布特征研究[J].地球物理学报,2017,60(11):4149-4159. |
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| 作者姓名： | 邓明 景建恩 郭林燕 罗贤虎 黄建宇 陈凯 王猛 史心语 |
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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： | 十三五国家重点研发计划项目（2016YFC0303100），国家自然科学基金（61531001，41504138），中国地质调查局水合物专项（GZH201100307）联合资助. |
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| 摘 要： | 采用海洋可控源电磁方法进行海底油气和水合物的勘查,需事先在海底布放接收机阵列,而后用一艘携带深拖缆的科考船将大功率电磁发射机牵引至海底,沿预设路线慢速走航,并将大功率电磁场导入海底.海底的人工电磁场中,空气波和直达波对提取勘探目标体的异常信息不做贡献.只有当折射波经过被测目标体时,产生电磁感应,海底的接收机对此感应信号进行数据采集,经数据处理,揭示被测目标体的几何大小和物理属性.异常体的有用信息与导入海底电磁场的能流密度(坡印廷矢量)有着密切的关系,以致于后者决定了前者的有效探测范围、有效带宽以及尽可能达到的最佳测量精度.能流密度在海底的分布情况十分复杂,但在均匀全空间中可较清楚地认识其分布特征,可为复杂地质条件的情况作理论铺垫.以此推广,在水平层状介质的地电条件下,建立能流密度的数理模型,利用海洋生产作业中的典型物性与几何参数,对海底以下有覆盖层的高阻体(可模拟油气或天然气水合物)进行正演,建立电磁场能流密度分布特征与数据采集技术的有机联系,为海洋可控源电磁发射机和接收机的优化改进提供理论依据.
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| 关 键 词： | 海洋可控源电磁法 坡印廷矢量 探测仪器 递推公式 异常探测范围 收发距 测量精度 |
| 收稿时间： | 2017-02-18 |
The distribution characteristics of the energy flow density of MCSEM |
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| DENG Ming,JING Jian-En,GUO Lin-Yan,LUO Xian-Hu,HUANG Jian-Yu,CHEN Kai,WANG Meng,SHI Xin-Yu.The distribution characteristics of the energy flow density of MCSEM[J].Chinese Journal of Geophysics,2017,60(11):4149-4159. |
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| Authors: | DENG Ming JING Jian-En GUO Lin-Yan LUO Xian-Hu HUANG Jian-Yu CHEN Kai WANG Meng SHI Xin-Yu |
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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 controlled source electromagnetic (MCSEM) can be used for the exploration of undersea oil, gas and gas hydrates. In this process, receiving array should be placed on the seabed firstly. Next, a scientific research ship tows the designed high power electromagnetic transmitter above the seafloor and then sails slowly along pre-designed route. At the same time, the transmitter delivers high power electromagnetic field into the seafloor. In this man-made submarine electromagnetic field, air wave and direct wave can be ignored because they don't make any contribution on the extraction of abnormal information of exploration targets. When the refraction wave travels through the target, electromagnetic induction occurs, recorder array can acquire the induced signal. After subsequent data processing, it can reveal abnormal information of the measured target, such as geometrical parameters and physical properties. Besides, these useful information has a close relationship with the electromagnetic energy flow density (the Poynting vector). The latter determines the effective detection range, effective bandwidth and precision of the former. But the distribution of energy flow density here is very complex. Hence, based on the calculation of energy flow density distribution characteristics in homogeneous whole space, mathematical model of distribution characteristics can also be set up in horizontal layered media. Using typical physical properties and geometric parameters, forward modeling of high resistance body, such as oil, gas or natural gas hydrates, with covering layer can be proceeded. It can provide the relationship between electromagnetic field energy flow density distribution characteristics and data acquisition. Furthermore, it can also provide theory basis for the optimization of improvement of MCSEM transmitter and receiver. |
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| Keywords: | Marine controlled source electromagnetic (MCSEM) Poynting vector Detection instrument Recursive formula Abnormal detection range Offset Measurement accuracy |
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