基于不同稳定泛函约束的大地电磁极值边界反演研究及其在高放废物处置库选址中的应用*

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摘要通常基于不同稳定泛函的反演对目标体边界的刻画存在着差异，尤其对复杂地质构造。为此，本文提出了面向电性边界识别的基于不同稳定泛函的极值边界反演算法。首先选择最平滑、最小支撑两种稳定泛函研究自适应正则化反演算法对不同稳定泛函的适用性，然后通过引入极值边界反演算法，研发基于不同稳定泛函的电性边界识别技术。研究结果表明：自适应正则化反演方法适用于不同的稳定泛函，而且对初始模型的依赖性较低；极值边界反演算法得到的光滑和聚焦上下界并集的比值可以作为划分电性界面的有效依据。在此基础上，本文以内蒙古塔木素地区高放废物粘土岩处置库场址预选为例，将本文提出的反演算法应用于该区的大地电磁测深(MT)数据反演，利用光滑反演了解区域构造，利用聚焦反演了解局部细节，并结合地表地质和钻孔资料，基于地下地质体的电性边界的识别，圈定了目标层的厚度，得到的目标层的厚度满足高放废物处置库选址的要求。

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关键词：大地电磁测深自适应正则化反演模型稳定泛函极值边界反演高放废物处置库塔木素

Abstract： Geophysical inversion under different stabilizers has different descriptions of the target body boundary, especially in complex geological structures. In this paper, we present an extremum boundary inversion algorithm based on different stabilizers for electrical interface recognition. Firstly, we use the smoothest and minimum-support stabilizing functional to study the applicability of adaptive regularization inversion algorithm. Then, an electrical interface recognition method based on different stabilizers is developed by introducing extremum boundary inversion algorithm. The testing shows that the adaptive regularization inversion method does work for different stabilizers and has a low dependence on the initial models. The ratio of the smooth and focusing upper and lower boundaries obtained using the extremum boundary inversion algorithm can clearly demarcate electrical interfaces. We apply the inversion algorithm to the magnetotelluric (MT) data collected from a preselected area of a high-level-waste clay-rock repository site in the Tamusu area. We recognized regional structures with smooth inversion and the local details with focusing inversion and determined the thickness of the target layer combined with the geological and drilling information, which meets the requirement for the site of the high-level waste clay-rock repository.

Key words： magnetotelluric adaptive regularization inversion stabilizer extremum boundary inversion high-level waste repository Tamusu

收稿日期: 2018-04-30;

基金资助:

本研究由国家自然科学基金课题（No. 41604104、41674077、41404057）、国防科工局高放废物地质处置项目（科工二司[2014]1578 号）、同济大学海洋地质国家重点实验室开放基金（MGK1704）、江西省青年科学基金（No. 20171BAB213031）和东华理工大学博士科研启动基金（DHBK201403）联合资助。

通讯作者: 邓居智(E-mail：jzhdeng@ecut.edu.cn) E-mail: jzhdeng@ecut.edu.cn

作者简介: 黄贤阳，东华理工大学在读硕士，2016 年本科毕业于东华理工大学地球物理学专业，目前主要从事地球物理电磁法正反演及应用研究。E-mail：xianyanghuang1995@hotmail.com

引用本文:

. 基于不同稳定泛函约束的大地电磁极值边界反演研究及其在高放废物处置库选址中的应用*[J]. 应用地球物理, 2019, 16(3): 367-377.

. Magnetotelluric extremum boundary inversion based on different stabilizers and its application in a high radioactive waste repository site selection*[J]. APPLIED GEOPHYSICS, 2019, 16(3): 367-377.