频率域电磁法超深管道探测的应用及探讨

Application and Discussion of Frequency Domain Electromagnetic Method on Ultra Deep Pipe Exploration

随着非开挖管线施工技术的广泛应用,地下管道埋设深度越来越大,超深管道的探测逐渐成为城市物探的一个热点和难点。结合澳门某海底航油管道探测的实例,对频率域电磁法超深管道探测进行了分析探讨。本项目数据采集和拟合反演过程中有不少值得深入探讨的问题,如数据采集时为什么应该采集基本场的水平分量,采用拟合反演进行管道定深有什么步骤、要遵循什么原则才能取得可靠的成果等。针对本项目的特殊情况,探测过程中先后采用了感应激发法、单端充电法等不同激发方式,对采集到的数据进行拟合反演,最终成功实现了对目标管道的定位定深。

With the extensive application of the construction technology of the trenchless pipeline,the depth of underground pipelines is becoming larger and larger,and the detection of the ultra deep pipelines has gradually become a hot and difficult point in the urban geophysical exploration.Combined with an example of a submarine oil pipeline exploration in Macao,the frequency domain electromagnetic method for deep pipe detection is analyzed and discussed.There are many problems that are worthy of deeply discussing in the process of data acquisition and fitting inversion in this project,such as why we should collect the horizontal component of the basic field,what steps are there while adopting fitting inversion to measure the depth of pipeline,and what principles should be followed to gain reliable results.In view of the special situation of this project,different shooting modes such as induction excitation and single-ended charging are adopted in the detection process.After conducting fitting inversion of the collected data,the positioning depth of the target pipeline is finally achieved.