刘云鹤,,
殷长春,
邱长凯,
王青,
李金峰
吉林大学地球探测科学与技术学院, 长春 130026
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
详细信息
作者简介: 张洁, 女, 1995年生, 硕士, 主要从事海洋电磁方法技术研究.E-mail:jiez17@mails.jlu.edu.cn
通讯作者: 刘云鹤, 男, 1982年生, 副教授, 主要从事电磁法勘探理论模拟与应用研究.E-mail:lyh19820131@163.com
中图分类号: P631收稿日期:2018-05-28
修回日期:2019-09-04
上线日期:2019-11-05
Three-dimensional regularized inversion of marine controlled-source EM data based on unstructured tetrahedral meshes
ZHANG Jie,LIU YunHe,,
YIN ChangChun,
QIU ChangKai,
WANG Qing,
LI JinFeng
College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China
More Information
Corresponding author: LIU YunHe,E-mail:lyh19820131@163.com
MSC: P631--> Received Date: 28 May 2018
Revised Date: 04 September 2019
Available Online: 05 November 2019
摘要
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.
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
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.
Key words:MCSEM/
Topographic seafloor/
3D inversion/
Unstructured grids/
Regularized inversion
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http://www.geophy.cn/data/article/export-pdf?id=dqwlxb_15241
