中文摘要：

地磁暴对油气管网、电网、高铁系统等基础设施的影响已成为关注的热点。与地磁暴对电网影响的研究相比,目前对油气管网和高铁的地磁暴侵害研究不够。地磁暴在油气管网中感应的地磁感应电流（geomagnetically induced current,GIC）和管地电位（pipe-soil potentials,PSP）与磁暴强度、大地构造、埋地管道自身结构等因素有关,不同深度大地电导率的差异影响油气管网的GIC和PSP大小。根据地磁暴在埋地油气管网产生GIC和PSP机理,以及我国岩石圈大地电性构造数据,考虑不同深度的大地电导率的差异,建立大地深层电导率分区分层模型,推导每层波阻抗递推关系式以及大地感应电场与地磁场关系式,得到基于平面波理论的大地和油气管网感应电场的算法,根据分布源传输线理论给出地下油气管网的GIC和PSP计算方法。最后,计算西气东输一线油气管网GIC和PSP水平,证明油气管网GIC和PSP效应评价方法的有效性。

英文摘要：

The effect of geomagnetic storm to national infrastructure including pipeline, power system and high-speed railway system is paid more and more concern. Compared to the study of power system, study of pipeline and high-speed railway system is insufficient at the present. Geomagnetically induced current（GIC）and pipe-soil potentials （PSP） induced in the pipeline during the geomagnetic storm is closely related to magnetic storm intensity, earth structure and network. Different earth conductivities at different depths have great influence on GIC and PSP induced in the pipeline. According to the principle of GIC and PSP induced in the buried pipeline and parameters of earth electric property of lithosphere, considering different earth conductivities at different depths, an subarea layered-earth conductivity model was constructed in this paper, recurrence relation of wave impedance in each layer and the relationship formula between earth electric field and earth magnetic field were also derived. The earth electric field and pipeline electric field based on the plane wave method were obtained, and methodology of the GIC and PSP in the pipeline based on distributed source transmission line （DSTL） theory was demonstrated. Then the GIC and PSP level in project of natural gas transmission from West to East China were calculated to illustrate availability of this method.