基于MPI并行及非结构化网格的2.5维CSAMT正演研究

可控源音频大地电磁CSAMT观测数据受发射源的影响,长期以来该方法仅远区信号较弱的数据能被利用,造成近区及过渡区信号较强的资料严重浪费。为避免数据浪费,在Windows平台使用Fortran语言和MPICH2工具,开发了考虑源的CSAMT2.5D正演程序,同时采用了MPI并行技术加速计算。由于实际地下介质边界复杂,程序不同于前人矩形网格,直接采用非结构化三角网格能快速适应复杂边界。通过与一维CSAMT程序对比,验证了2.5D程序的正确性;并通过复杂模型试算,表明考虑源的2.5DCSAMT实用性,为下一步反演工作奠定了理论基础。

Research of 2.5D CSAMT forward parallel computation based on MPI and unstructured grid

The observational data of Controlled Source Audio-frequency Magnetotellurics (CSAMT ) is influenced by source which makes the far-field data can only be used and seriously waste the near-field and intermediate-field data. In order to avoid wasting data, this paper adopts Fortran language and MPICH2 tool to develop CSAMT2.5D forward program based on windows system. In addition, we use MPI parallel technology to accelerate the computation. Because the boundry of underground structure can be very complex , so this program directly adopts unstructured grid which is different from the former work and can easily adjust to the complex boundry. We validate the 2.5D program by compared with the 1D CSAMT program. Besides, we show the practicability of 2.5D CSAMT through computing complex mode and provide theoretical foundation for the next inversion research.