Journal of Jilin University(Earth Science Edition) ›› 2022, Vol. 52 ›› Issue (3): 754-765.doi: 10.13278/j.cnki.jjuese.20210242

Previous Articles     Next Articles

Three-Dimensional Forward Modeling of Long-Offset Transient Electromagnetic Method over Topography

Wang Xinyu1, 2, Yan Liangjun1, 2, Mao Yurong1, 2, Huang Xin1, 2, Xie Xingbing1, 2, Zhou Lei1, 2   

  1. 1.  Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education, Wuhan 430100, China

    2. Cooperative Innovation Center of Unconventional Oil and Gas, Wuhan 430100, China

  • Online:2022-05-26 Published:2024-01-03
  • Supported by:
    Supported by the National Natural Science Foundation of China (42030805, 41774082) and the Science and Technology Research Program of Hubei Provincial Department of Education (Q20201311)

PDF (PC)

415

Abstract:

The topography of geophysical exploration areas is often undulating and complex, and the traditional long-offset transient electromagnetic method (LOTEM) 3D forward modeling generally does not consider the influence of topography. However, the topographic factors seriously affect the reasonable interpretation of LOTEM data. The 3D forward modeling of LOTEM under real topography by the unstructured edge finite element method is developed in this study. Firstly, the 3D modeling software Blender is used to accurately build a complex geoelectric model, and the unstructured tetrahedral mesh is used to finely describe the real topography. Secondly, the dipole discrete field source processing technique is used to separate the long conductor source into several electric dipoles, and the second-order backward-Euler scheme is used to complete the time discretization. In this way, fast and high precision 3D forward modeling of LOTEM can be realized. The transient electromagnetic field response characteristics of the complex geological model under real topography conditions are simulated on the premise of guaranteed computational accuracy. The results demonstrate that due to the influence of topography, the LOTEM electromagnetic field response is severely “distorted”, which can weaken or even completely “cover up” the transient electromagnetic field response of underground targets, and it seriously affects the effective detection of underground targets.

Key words: long-offset transient electromagnetic method, topography, unstructured edge finite element method, Blender, second-order backward-Euler scheme, 3D forward modeling

CLC Number: 

  • P631
[1] Jiang Tao, Jiang Xiao , Guo Jinyun, Zhang Zhonghui.  Review on Research Progress of Recovering Bathymetry from Satellite Altimetry-Derived Data [J]. Journal of Jilin University(Earth Science Edition), 2023, 53(6): 2029-2044.
[2] Qi Yanfu, Li Xiu, Sun Naiquan, Qi Zhipeng, Zhou Jianmei, Zhang Mingjing, Xing Tao . Analysis of Influence Characteristics of Topography on GroundedSource ShortOffset Transient Electromagnetic Responses [J]. Journal of Jilin University(Earth Science Edition), 2022, 52(1): 247-.
[3] Wei Wei, Zhou Yunxuan, Tian Bo, Qian Weiwei, Zhan Yujian, Huang Gaixian. Topography Retrieval on Typical Salt Marsh of Coastal Zone Based on Terrestrial Laser Scanning [J]. Journal of Jilin University(Earth Science Edition), 2018, 48(6): 1889-1897.
[4] Guo Zhenbo, Li Zhenchun. Acoustic Wave Modeling in Frequency-Spatial Domain with Surface Topography [J]. Journal of Jilin University(Earth Science Edition), 2014, 44(2): 683-693.
[5] SUN Zhang-qing, SUN Jian-guo, ZHANG Dong-liang. 2.5-D DC Electric Field Numerical Modeling Including Surface Topography Based on Coordinate Transformation Method [J]. J4, 2010, 40(2): 425-431.
[6] SUN Zhang-qiang, SUN Jian-guo, ZHANG Dong-liang. 2D DC Electric Field Numerical Modeling Including Surface Topography Using Coordinate Transformation Method [J]. J4, 2009, 39(3): 528-534.
[7] FANG Shi,LIU Zhao-jun，HUANG Xiang-tong，GUO Wei，LIU Zhi-qiang. Uplift and Topography Evolution Research at FT in Cenozoic of South-Eastern Slope of Daxing’anling Mountains [J]. J4, 2008, 38(5): 771-0776.
[8] JING Jian-en, WEI Wen-bo,MEI Zhong-wu. Discussion on Development Regularities of Karst Cave on Top of the Ordovician of Tahe Oilfield and Relation in OilGas [J]. J4, 2005, 35(05): 622-625.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] Wu Yuankun, Liu Chenglin, Yu Chunyong.. Main Controlling Factors and Accumulation Mode of Deep Oil in Shuangcheng Fault Depression of Songliao Basin[J]. Journal of Jilin University(Earth Science Edition), 2024, 54(5): 1443 -1456 .
[2] Ma Rong, Shi Jiansheng, Liu Jichao. Application of Artificial Endocrine Network Model in Studying of Hydrogeology Parameter[J]. Journal of Jilin University(Earth Science Edition), 2013, 43(3): 914 -921 .
[3] Li Ning, Wang Chengwen. Formation and Evolution of Jiamusi-Mongolia Block and Contact Relationship of Late Paleozoic Strata in Northeast China and Adjacent Region[J]. Journal of Jilin University(Earth Science Edition), 2017, 47(5): 1331 -1340 .
[4] HU Da-qian, CHU Feng-you, YAO Jie. The Mineral Composition and Element Geochimestry of CoEnriched Crust from the YJA Sea Mount in the Central Pacific Ocean[J]. J4, 2006, 36(01): 32 -0037 .
[5] JIANG Xue, CHENG Ri-hui, YU Min-feng. Climate and Tectonic Controls on the Rift Stratigraphy:Analysis of Zscape Model and its Application in the BeianFaulting Depression of the Songliao Basin[J]. J4, 2006, 36(01): 54 -0059 .
[6] LI Chun-bai，ZHANG Xin-tao，LIU Li，REN Yan-guang,MENG Peng. The Thermal Fluid Activities and Their Modification on Volcaniclastic Rock in Budate Group-An Example from the Beier Sag of Hailaer Basin[J]. J4, 2006, 36(02): 221 -0226 .
[7] Meng Xiangang, Bo Wanju, Liu Zhiguang, LiuYong, Chang Liu, Li Chaozhu, Wang Ziping. Activity in the Middle East of Bayan Har Block with Lushan MS 7.0 Earthquake[J]. Journal of Jilin University(Earth Science Edition), 2014, 44(5): 1705 -1711 .
[8] Chen Huanqing, Liang Shuxian, Shu Zhirui, Deng Xiaojuan, Peng Shouchang. Characteristics of Conglomerate Reservoir Architecture of Alluvial Fan and Its Controlling Effects to Reservoir Development:Taking Alluvial Fan Reservoir in Some Area of Northwest Margin of Junggar Basin as an Example[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(1): 13 -24 .
[9] JIA Dacheng, XING Lixin, PAN Jun, M. J. van Bergen, H. van Roermund. Geochemical Characteristics of the AluminumEnriched Spinels in Xenoliths from the Upper Mantle Shear Belt in Yitong，Northeastern China[J]. J4, 2006, 36(04): 497 -502 .
[10] XIE Zhong-lei, YANG Bai-ling, BAO Guo-zhang,DONG De-ming. Fractionation and Its Affecting Factors of Nickel in Tea Garden Soils[J]. J4, 2006, 36(04): 599 -604 .
Copyright © Journal of Jilin University(Earth Science Edition), All Rights Reserved.
Tel: +86-431-88502374；13756165364　E-mail: xuebao1956@jlu.edu.cn
Powered by Beijing Magtech Co. Ltd