SOTEM野外数据采集中的关键参数分析

Analysis of critical parameters in the field acquisition ofshort-offset transient electromagnetic data

电性源短偏移距瞬变电磁法(SOTEM)在野外数据采集中涉及诸多参数,它们的选择与实测数据的信号质量、探测灵敏度等密切相关。本文依据中国地球物理学会团体标准《电性源短偏移距瞬变电磁法勘探技术规程》(T/CGS 002—2021)中的相关规定,并结合一些数值模拟和实际案例,对发射源长度、发射基频、偏移距、装置类型、观测分量等关键参数的选取依据进行了分析与阐述,获得的相关认识对指导SOTEM野外施工、发挥SOTEM探测性能具有重要意义。

The grounded-source short-offset transient electromagnetic(SOTEM)method involves many parameters in field data acquisition.The selection of these parameters is closely associated with the signal quality and detection sensitivity of measured data.Based on the relevant provisions in the organization standard,Technical specification for grounded-source short-offset transient electromagnetic method(T/CGS 002—2021),issued by the Chinese Geophysical Society,numerical emulations,and practical cases,this study analyzed and expounded the selection criteria of critical parameters like transmitting source length,transmitting fundamental frequency,offset,device type,and observation component.The insights obtained in this study are significant for guiding the field construction of the SOTEM device and leveraging its detection performance.