| 基于非结构网格剖分的海洋可控源电磁三维正则化反演研究 |
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| 引用本文： | 张洁,刘云鹤,殷长春,邱长凯,王青,李金峰.基于非结构网格剖分的海洋可控源电磁三维正则化反演研究[J].地球物理学报,2019,62(11):4451-4461. |
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| 作者姓名： | 张洁 刘云鹤 殷长春 邱长凯 王青 李金峰 |
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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： | 国家自然科学基金项目（41530320，41774125），国家重点研发计划（2017YFC0601900，2016YFC0303100）和中国科学院先导专项（XDA14020102）联合资助，吉林大学高层次科技创新团队建设项目（JLUSTIRT）和中央高校基本科研业务费专项资金资助. |
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| 摘 要： | 为更好地处理与解释复杂海底地形条件下测得的海洋可控源电磁数据，本文提出了一种基于非结构网格剖分的频率域海洋可控源电磁数据三维正则化反演方法.该方法首先对海洋地电模型以非结构四面体单元进行离散，然后基于矢量有限元方法获得海洋可控源电磁响应和灵敏度信息，最后采用共轭梯度法求解高斯-牛顿反演方程计算模型修正量.为提高反演的稳定性，通过在反演过程中采用对数转换方法实现反演模型参数的上下限约束.本文分别测试了单测线水平海底地形反演算例和面积性测量的起伏海底地形反演算例.反演结果表明，本文提出的频率域海洋可控源电磁三维反演能够准确地恢复高阻储油层的位置和电阻率信息，且计算效率较高，可用于实测海洋电磁资料的处理与解释.
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| 关 键 词： | 海洋可控源电磁法 复杂地形 三维反演 非结构网格 正则化 |
| 收稿时间： | 2018-05-28 |
Three-dimensional regularized inversion of marine controlled-source EM data based on unstructured tetrahedral meshes |
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| ZHANG Jie,LIU YunHe,YIN ChangChun,QIU ChangKai,WANG Qing,LI JinFeng.Three-dimensional regularized inversion of marine controlled-source EM data based on unstructured tetrahedral meshes[J].Chinese Journal of Geophysics,2019,62(11):4451-4461. |
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| Authors: | ZHANG Jie LIU YunHe YIN ChangChun QIU ChangKai WANG Qing LI JinFeng |
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| Institution: | College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China |
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| Abstract: | In order to better interpret controlled-source electromagnetic (EM) data over a topographic seafloor, we propose a 3D regularized inversion method for frequency-domain marine controlled-source electromagnetic (MCSEM) survey based on unstructured grids. We first discretize the model domain by unstructured tetrahedral elements and calculate the MCSEM responses and sensitivity using the edge-based finite-element method (EB-FEM). Then, we use the Gaussian-Newton method to solve the inverse problem. To improve the stability, we use a logarithmic transformation method to achieve the upper and lower constraints for model parameters in the inversion process. We test the effectiveness of our algorithm by inverting synthetic data both for a flat seafloor with a single survey line and an undulating seafloor with multiple survey lines. The inversion results show that our 3D inversion method can well reconstruct the location and resistivity information of the resistive oil reservoirs under the seafloor with high efficiency. |
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| Keywords: | MCSEM Topographic seafloor 3D inversion Unstructured grids Regularized inversion |
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