• 应用地球物理学Ⅱ（海洋、工程、环境、仪器等） •

基于全区视电阻率的半航空瞬变电磁法对低阻薄层的探测能力探讨

1. 1.成都理工大学地球勘探与信息技术教育部重点实验室,成都 610059
2.电子科技大学资源与环境学院,成都 610054
• 收稿日期:2020-10-21 修回日期:2021-03-01 出版日期:2021-08-20 发布日期:2021-09-15
• 作者简介:易国财,男,1993年生,在读硕士,从事半航空瞬变电磁法勘探研究.E-mail: 553319648@qq.com
• 基金资助:
国家自然科学基金项目“稳定条件突破CFL限制的显式有限差分法模拟地形模型的三维半航空瞬变电磁响应”(41974158);开放基金项目“滑坡地质调查半航空瞬变电磁勘察实验研究”资助(SKLGP2020K023)

Study on the detection capability of low resistivity thin layer by semi-aviation transient electromagnetic method based on all-time apparent resistivity

YI GuoCai1(), WANG ShiXing1, WANG XuBen1, ZHOU Jun2, ZHANG SaiMing1, ZHANG ZhenXiong1, GUO Ming1, HE Ke1

1. 1. Key Lab of Earth Exploration and Information Techniques of Ministry of Education, Chengdu University of Technology, Chengdu 610059,China
2. School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 610054, China
• Received:2020-10-21 Revised:2021-03-01 Online:2021-08-20 Published:2021-09-15

Abstract:

To solve the problem of “binarity” in defining all-time apparent resistivity by induction electromotive force, this paper uses the vertical magnetic field component corresponding to all-time apparent resistivity and binary search algorithm to calculate all-time apparent resistivity, which makes all-time apparent resistivity unique and reliable. The concept of all-time apparent resistivity is introduced into semi-aviation transient electromagnetic method, on this basis, set up by a thin layer of low resistance for the middle tier three layers of geoelectric model, draw the different conductive thin layer buried depth and thickness ratio, surrounding rock and the resistivity of low resistivity layer than the all-time apparent resistivity anomaly of the graph, and analyzes its form and change law of apparent resistivity anomaly curve. By calculating its relative error, the detection capability of the semi-aviation transient electromagnetic method to the low resistivity thin layer is analyzed and summarized. The results show that the apparent resistivity has better resolution for the low resistivity thin layer and can better reflect the ground electrical section information, which has practical guiding significance for the effective detection of the low resistivity thin layer by the semi-aviation transient electromagnetic method.