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<p>Geothermal potential relies heavily on rock porosity and mineral composition, making the distinction between primary and secondary minerals crucial for reservoir characterization. This study presents a method for analyzing rocks from the Humeros geothermal site by integrating 2D optical microscopy with 3D computed tomography images. Rocks from three lithologies (HM-10, HM-24, and HM-06) were subjected to both 3D and subsequent 2D imaging. The 2D analysis revealed various minerals, including Opal, Olivine, and Pyroxenes in HM-10, Chlorite, Plagioclase, and Epidote in HM-24, and Pyrite, Quartz, and Chlorite in HM-06. These minerals were then segmented in 3D, allowing the measurement of their volume fraction, shape, orientation, distribution, and pore connectivity. The preferential distribution of each mineral provided insights into whether it formed concurrently with the rock or developed over time due to geothermal alteration. In conclusion, integrating 3D and 2D imaging techniques proves highly effective for acquiring data to estimate geothermal potential.</p> Graphic abstract <p></p>

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Coupling 2D and 3D image analyses to determine porosity and minerals of geothermal rocks

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Luis Olmos,
  • Hatziri Aileen Ojeda-Macedo,
  • Jorge Alejandro Ávila-Olivera,
  • Dante Arteaga-Martínez,
  • Boris Chako-Tchamabé

摘要

Geothermal potential relies heavily on rock porosity and mineral composition, making the distinction between primary and secondary minerals crucial for reservoir characterization. This study presents a method for analyzing rocks from the Humeros geothermal site by integrating 2D optical microscopy with 3D computed tomography images. Rocks from three lithologies (HM-10, HM-24, and HM-06) were subjected to both 3D and subsequent 2D imaging. The 2D analysis revealed various minerals, including Opal, Olivine, and Pyroxenes in HM-10, Chlorite, Plagioclase, and Epidote in HM-24, and Pyrite, Quartz, and Chlorite in HM-06. These minerals were then segmented in 3D, allowing the measurement of their volume fraction, shape, orientation, distribution, and pore connectivity. The preferential distribution of each mineral provided insights into whether it formed concurrently with the rock or developed over time due to geothermal alteration. In conclusion, integrating 3D and 2D imaging techniques proves highly effective for acquiring data to estimate geothermal potential.

Graphic abstract