| 海洋可控源电磁法发射源姿态影响研究 |
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| 引用本文： | 刘云鹤,殷长春,翁爱华,贾定宇.海洋可控源电磁法发射源姿态影响研究[J].地球物理学报,2012,55(8):2757-2768. |
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| 作者姓名： | 刘云鹤 殷长春 翁爱华 贾定宇 |
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| 作者单位： | 吉林大学地球探测科学与技术学院,长春 130026 |
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| 基金项目： | 国家自然科学基金(40874050);国家863重大项目(2012AA09A20103)资助 |
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| 摘 要： | 海洋电磁理论是建立在水平发射偶极的基础上.然而,由于海底洋流作用海洋可控源发射偶极可能产生水平摆动、倾斜和水平旋转,造成测量数据与理想状态的水平电偶极子的电磁响应有较大的偏差.为了研究发射源姿态变化对场的影响,本文提出利用欧拉旋转将发射偶极由源坐标系转换到地球坐标系,进而分析发射源姿态变化造成海洋电磁观测数据的误差分布...
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| 关 键 词： | 电磁法 海洋可控源电磁法 发射源姿态 水平发射偶极 |
| 收稿时间： | 2011-11-02 |
Attitude effect for marine CSEM system |
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| LIU Yun-He
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YIN Chang-Chun
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WENG Ai-Hua
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JIA Ding-Yu.Attitude effect for marine CSEM system[J].Chinese Journal of Geophysics,2012,55(8):2757-2768. |
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| Authors: | LIU Yun-He YIN Chang-Chun WENG Ai-Hua JIA Ding-Yu |
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| Institution: | College of Geoexploration Science and Technology, Jilin University, Changchun 130026,China |
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| Abstract: | The marine controlled source electromagnetic (MCSEM) theory is based on the assumption of a horizontal electrical dipole (HED). In actual practice, the transmitter exhibits roll, pitch, and yaw rotation due to the turbulence at the ocean bottom. This makes the survey data quite different from those of an ideal HED. In order to study the transmitter attitude effect on the observed data, we use the Euler rotation to transform the transmitter coordinate system back to the earth coordinate system to obtain the equivalent components from the dipole transmitter. Theoretical investigation shows that the errors resulted from transmitter pitch and yaw rotation depend on receiver’s position. Taking 1Hz of transmitting frequency as example, the two horizontal electric fields Ex from two equivalent electric dipole components in the earth coordinate system, transformed from a unit dipole in the transmitter coordinate system, have a phase difference of almost 360 degrees in the broadside zone, so the observed field is the sum of the fields from two equivalent dipoles. However, in the inline zone, the phase difference of fields from the two equivalent dipoles is roughly 180 degrees, leading to the observed signal being the difference of the two dipole fields. At the junction area of two regions, the transmitter attitude has the largest effect on observed data. Compared with pitch and yaw rotation, the roll rotation only affects the signal of small transmitter-receiver offsets because it only changes the transmitter location but not the characteristics of transmitter. Our research can help determine the parameters for MCSEM transmitting system design and provide theoretical basis for the analysis and correction of MCSEM data. |
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| Keywords: | Electromagnetic method Marine CSEM Attitude HED |
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