<p>This study introduces FTCSEM, a FORTRAN-based, parallelized one-dimensional controlled-source electromagnetic (CSEM) forward modeling and inversion software capable of accommodating arbitrary source-receiver configurations. In comparison to existing one-dimensional CSEM tools, FTCSEM incorporates several significant enhancements: it supports transmitters of diverse shapes, quantities, and spatial locations; permits receivers to be positioned flexibly on the surface, subsurface, or in the atmosphere; facilitates simulations and inversions in both frequency and time domains; integrates an adaptive regularized inversion algorithm with multiple model constraints; and leverages GPU-accelerated parallel computing to attain high computational efficiency. Validation through numerical experiments and field data inversion confirms the program’s accuracy and practical applicability. The findings indicate that FTCSEM performs robustly in complex geoelectric environments, multi-source and multi-receiver arrangements, as well as multi-component joint inversion scenarios, thereby offering a versatile and powerful tool for advancing CSEM research and applications.</p>

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FTCSEM—A FORTRAN-based parallelized 1D CSEM forward and inversion program for arbitrary source-receiver geometry

  • Wei-ying Chen,
  • Si-xu Han,
  • Wan-ting Song,
  • Yu-lian Zhu,
  • Zheng Liu

摘要

This study introduces FTCSEM, a FORTRAN-based, parallelized one-dimensional controlled-source electromagnetic (CSEM) forward modeling and inversion software capable of accommodating arbitrary source-receiver configurations. In comparison to existing one-dimensional CSEM tools, FTCSEM incorporates several significant enhancements: it supports transmitters of diverse shapes, quantities, and spatial locations; permits receivers to be positioned flexibly on the surface, subsurface, or in the atmosphere; facilitates simulations and inversions in both frequency and time domains; integrates an adaptive regularized inversion algorithm with multiple model constraints; and leverages GPU-accelerated parallel computing to attain high computational efficiency. Validation through numerical experiments and field data inversion confirms the program’s accuracy and practical applicability. The findings indicate that FTCSEM performs robustly in complex geoelectric environments, multi-source and multi-receiver arrangements, as well as multi-component joint inversion scenarios, thereby offering a versatile and powerful tool for advancing CSEM research and applications.