吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (2): 578-590.doi: 10.13278/j.cnki.jjuese.20180009

• 地球探测与信息技术 • 上一篇    下一篇

基于场延拓的海洋可控源电磁正演模拟及各向异性特征识别

张文强, 殷长春, 刘云鹤, 张博, 任秀艳   

  1. 吉林大学地球探测科学与技术学院, 长春 130026
  • 收稿日期:2018-01-15 出版日期:2019-03-26 发布日期:2019-03-28
  • 通讯作者: 任秀艳(1989-),女,博士研究生,主要从事电磁法正反演方法的研究,E-mail:jdrxy1990@163.com E-mail:jdrxy1990@163.com
  • 作者简介:张文强(1994-),男,硕士研究生,主要从事电磁法正反演方法的研究,E-mail:mrzhangwenq@163.com
  • 基金资助:
    国家重点研发计划重点专项(2018YFC0603300,2016YFC0303100,2017YFC0601903);国家自然科学基金项目(41530320,41774125);中科院先导专项(XDA14020102)

Field Continuation for MCSEM Forward Modeling and Identification of Anisotropic Media

Zhang Wenqiang, Yin Changchun, Liu Yunhe, Zhang Bo, Ren Xiuyan   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2018-01-15 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by Key Project of National Key R & D Program of China (2018YFC0603300, 2016YFC0303100, 2017YFC0601903), National Natural Science Foundation of China (41530320, 41774125), and Strategic Priority Research Program of Chinese Academy of Sciences (XDA14020102)

摘要: 海洋可控源电磁法近年来被广泛应用于海洋油气勘探之中,凭借对高阻含油储层的有效识别大大降低干井率,节约钻探成本。受沉积环境的影响,海底地层常常表现出宏观各向异性,而对海洋各向异性模拟算法进行研究可以更有效地进行海洋电磁数据解释。本文从频率域麦克斯韦方程出发,基于标量势分解理论,通过标量势函数与场的连续性条件,在波数域中将电磁场分别向海底深部和海水中延拓,并在海底耦合到发射源上完成电磁场的求解,进而利用汉克尔变换得到了空间域电磁场。通过对海底介质一维各向异性模型电磁响应特征的分析研究发现,覆盖层各向异性对电磁响应有明显的影响;然而,海底高阻层仅垂向电阻率和厚度对海洋电磁响应产生明显影响。通过极性图的方式可以对海底介质各向异性特征进行有效识别。

关键词: 海洋可控源电磁法, 电各向异性, 正演模拟, 视电阻率, 各向异性识别

Abstract: Marine controlled-source electromagnetic (MCSEM) has been widely used in offshore hydrocarbon exploration in recent years. Huge drilling cost has been saved because of its high sensitivity to resistive oil reservoirs. The ocean sedimentary environment creates strong stratification and anisotropy in submarine media. Thus, the modeling for MCSEM needs to be made for anisotropic media. In this study, we solved the problem of electromagnetic (EM) field in wavenumber domain by introducing two scalar potentials that are continued upwards and downwards based on the continuation conditions of EM field and coupled to transmitting source at the location of transmitting dipole. The EM field in the space domain was calculated by using Hankel Transform. Through the analysis of anisotropic characteristics, we found that the anisotropy has a great influence on the responses of MCSEM, and only the vertical resistivity and the thickness have an influence on the responses of MCSEM for the resistive reservoir. We set up a procedure to distinguish the earth's anisotropy from the polar plots of marine apparent resistivity. This study lays a foundation for the inversion and interpretation of marine EM data.

Key words: marine CSEM, electrical anisotropy, forward modeling, apparent resistivity, anisotropic identification

中图分类号: 

  • P631.3
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