地球物理学进展 ›› 2018, Vol. 33 ›› Issue (4): 1645-1651.doi: 10.6038/pg2018BB0407

• 应用地球物理学Ⅰ(油气及金属矿产地球物理勘探) • 上一篇    下一篇

复杂条件下大地电磁资料二维反演及初始模型构建研究

张泉1,李永飞2,田靖1,郜晓勇2,孙守亮2,袁宏亮1   

  1. 1. 陕西地矿物化探队,西安 710043
    2. 中国地质调查局沈阳地质调查中心,沈阳 110034
  • 收稿日期:2017-10-31 修回日期:2018-06-11 出版日期:2018-08-20 发布日期:2018-09-14
  • 作者简介:张泉,男,1985年生,硕士研究生,工程师,主要从事电磁法勘探理论及应用研究.(E-mail: 18092233936@163.com)
  • 基金资助:
    基中国地质调查局地质调查项目“凌源—宁城盆地牛营子地区阵列电磁法测量”(121201007000150074)

Two-dimensional inversion and initial model construction of magnetotelluric data in complex conditions are studied

ZHANG Quan1,LI Yong-fei2,TIAN Jing1,GAO Xiao-yong2,SUN Shou-liang2,YUAN Hong-liang1   

  1. 1. Team of Geophysical and Geochemical Exploration, Bureau of Geology and Mineral Resources Exploration and Development of Shaanxi, Xi’an 710043,China;
    2. Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034,China;
  • Received:2017-10-31 Revised:2018-06-11 Online:2018-08-20 Published:2018-09-14

摘要:

大地电磁资料反演方法较多,但构建二维反演初始模型常规方法主要有两种:以均匀半空间为初始模型、直接以一维反演结果为初始模型.本文利用典型实测剖面资料对这两种方法进行反复试验对比,结果表明:在地形及构造复杂地区,由于实测资料存在严重的静态效应,利用常规方法构建反演初始模型进行二维反演,难以达到理想的反演效果.基于此,本文提出了一种构建二维反演初始模型与反演新的思路方法,其核心为用于反演与构建初始模型数据为同一基础数据,但对基础数据分别进行处理,得到两个处理及校正程度不同的数据,分别用于初始模型构建与二维反演输入数据,这样得到的反演结果既能较好地保留浅部至深部有用异常信息,又能够最大程度上消除实测资料中的静态效应.本文进一步对实测剖面反演结果与已知地质信息进行对比,验证了本方法的有效性和可靠性,认为此方法为地形及地质条件复杂地区大地电磁资料处理反演提供了新的思路,具有一定的参考意义和借鉴作用.

关键词: 大地电磁, 二维反演, 初始模型构建, 非线性共轭梯度反演, 凌源—宁城盆地;

Abstract:

At present,there are many methods of inversion of geomagnetic data, but there are two main methods of constructing two-dimensional inversion initial model:the uniform half-space is the initial model, and the one-dimensional inversion result is taken as the initial model. The results show that in the terrain and complex area, due to the serious static effect of the measured data, the inversion initial model is constructed by the conventional method for two-dimensional inversion, which is difficult to analyze the two methods. To achieve the desired inversion effect. On the basis of the above, two new methods and methods of constructing the initial model of two-dimensional inversion are proposed, which are used to invert and construct the initial model data. Based data,but the basic data were processed, respectively, two processing and correction of different degrees of data, respectively, for the initial model construction and two-dimensional inversion of input data, so that the inversion results to retain useful information in the shallow, and deep Guaranteed uniform electrical structure. In this paper, the results of the inversion of the measured profiles are compared with the known geological information,and the validity and reliability of the method are verified. This method provides a new idea for the geomagnetic data processing in terrain and complex geological conditions. The reference meaning and reference function.

Key words: magneto telluric, two-dimensional inversion, initial model construction, nonlinear conjugate gradient inversion, Lingyuan-Ningcheng basin

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