时频电磁与大地电磁数据联合反演

doi:10.13810/j.cnki.issn.1000-7210.2023.03.025

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石油地球物理勘探 ›› 2023, Vol. 58 ›› Issue (3) : 720-727. DOI: 10.13810/j.cnki.issn.1000-7210.2023.03.025

非地震

时频电磁与大地电磁数据联合反演

胡祖志¹, 刘雪军¹, 王志刚¹, 何展翔^2,3, 杨俊¹

作者信息 +

Joint inversion of time-frequency electromagnetic and magnetotelluric data

HU Zuzhi¹, LIU Xuejun¹, WANG Zhigang¹, HE Zhanxiang^2,3, YANG Jun¹

Author information +

文章历史 +

摘要

时频电磁法属于一种人工源电磁方法，具有抗干扰能力强、对中—浅层的电性层有较高分辨率的优点，但目前受限于最低激发频率，对深层电性层反映有限；大地电磁是一种天然场源电磁方法，具有测量频率低、探测深度大的特点。因此，这两种方法具有互补性。基于奥克姆反演算法，笔者提出新的联合加权方法，对时频电磁与大地电磁的数据进行联合反演处理。模型和实测数据试算结果表明，时频电磁与大地电磁的联合反演既可提高对浅部电性异常体的分辨率，也能提升对深部电性层的探测精度，增强了利用电磁勘探技术解决地质问题的能力。

Abstract

The time-frequency electromagnetic method is a controlled-source electromagnetic method, which has a strong anti-interference ability and a high resolution for the electrical layer in the middle and shallow layers. However, it is limited by the lowest excitation frequency and has a limited reflection of the deep layer. The magnetotelluric method is a natural source electromagnetic method, which features low measurement frequency and large detection depth. Hence, the two methods are complementary. In this paper, on the basis of Occam's inversion algorithm, a new joint weighting method is proposed for the joint inversion between time-frequency electromagnetic and magnetotelluric data. The data of model and field tests show that the joint inversion of time-frequency electromagnetic and magnetotelluric data can improve the resolution of shallow electrical anomalies, optimize the detection accuracy of deep electrical layers, and improve the ability of electromagnetic exploration to solve geological problems.

导出引用

胡祖志, 刘雪军, 王志刚, 何展翔, 杨俊. 时频电磁与大地电磁数据联合反演[J]. 石油地球物理勘探, 2023, 58(3): 720-727 https://doi.org/10.13810/j.cnki.issn.1000-7210.2023.03.025

HU Zuzhi, LIU Xuejun, WANG Zhigang, HE Zhanxiang, YANG Jun. Joint inversion of time-frequency electromagnetic and magnetotelluric data[J]. Oil Geophysical Prospecting, 2023, 58(3): 720-727 https://doi.org/10.13810/j.cnki.issn.1000-7210.2023.03.025

中图分类号： P631

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基金

本项研究受中国石油集团科学研究与技术开发项目"复杂区深层及火成岩重磁电震一体化关键技术研究"(2021DJ3706)、深圳市科技计划项目"深海深地资源探测技术系统研发"(KQTD20170810111725321)、深圳市深远海油气勘探技术重点实验室(ZDSYS20190902093007855)联合资助。