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<p>This study focuses on delineating the basement depth and subsurface structures, with a particular emphasis on lithology identification, within the context of the expanding New Aswan City. The integration of Magnetic and Time-Domain Electromagnetic (TDEM) datasets were used, serves as the foundation for this investigation. Magnetic data, processed through different techniques, offer insights into the depth of the basement, subsurface structures, and lithology identification. Initial estimates suggest depths ranging from 1000 to 1600&#xa0;m for deep sources and 130–200&#xa0;m for shallow sources. TDEM data, collected from an extensive network of stations arranged in both east–west and north–south orientations, reveal the presence of three distinct geoelectric layers. The surface layer is characterized by alluvial deposits with varying resistivity values (53–3651&#xa0;Ω.m) and thicknesses (10–25&#xa0;m). The second layer comprises silty sandstone, exhibiting lower resistivity values (2.50–52&#xa0;Ω.m) and thicknesses (15–145&#xa0;m). Finally, the third layer predominantly consists of shale and clay, displaying very low resistivity values (&lt;1 to 19&#xa0;Ω.m) and the thickness of this layer could not be determined in the current geoelectric survey as it extends beyond the depth that was explored. Structurally, the encountered elements predominantly trend in the NE–SW, NW–SE, NNW–SSE, and E–W directions. Through the comprehensive analysis of geophysical data, this study contributes to the understanding of subsurface characteristics and geological features vital for urban planning and development in the region.</p>

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Integration of geophysical methods for investigating subsurface geology and basement depth in the western extension of New Aswan City, Egypt

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Ahmed M Meneisy,
  • Ayman Taha,
  • Ahmed Hamed,
  • Mohamed El Bohoty,
  • Essam Ghamry,
  • Mohamed Khalifa

摘要

This study focuses on delineating the basement depth and subsurface structures, with a particular emphasis on lithology identification, within the context of the expanding New Aswan City. The integration of Magnetic and Time-Domain Electromagnetic (TDEM) datasets were used, serves as the foundation for this investigation. Magnetic data, processed through different techniques, offer insights into the depth of the basement, subsurface structures, and lithology identification. Initial estimates suggest depths ranging from 1000 to 1600 m for deep sources and 130–200 m for shallow sources. TDEM data, collected from an extensive network of stations arranged in both east–west and north–south orientations, reveal the presence of three distinct geoelectric layers. The surface layer is characterized by alluvial deposits with varying resistivity values (53–3651 Ω.m) and thicknesses (10–25 m). The second layer comprises silty sandstone, exhibiting lower resistivity values (2.50–52 Ω.m) and thicknesses (15–145 m). Finally, the third layer predominantly consists of shale and clay, displaying very low resistivity values (<1 to 19 Ω.m) and the thickness of this layer could not be determined in the current geoelectric survey as it extends beyond the depth that was explored. Structurally, the encountered elements predominantly trend in the NE–SW, NW–SE, NNW–SSE, and E–W directions. Through the comprehensive analysis of geophysical data, this study contributes to the understanding of subsurface characteristics and geological features vital for urban planning and development in the region.