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<p>This study evaluates the application of the Nanoindentation Test Method (NTM) for assessing the mechanical properties of rocks in the Southern Perth Basin, specifically utilizing crushed cuttings from the GSWA HW-1 well. Given the challenges associated with traditional laboratory testing, such as the need for intact core samples and the time-consuming nature of such methods, NTM provides a viable alternative for characterizing the elastic modulus and other mechanical properties of fine-grained and heterogeneous lithologies. Our findings demonstrate a strong correlation between elastic moduli derived from NTM and those obtained through uniaxial compressive strength (UCS) tests, validating the reliability of NTM in scenarios where high-quality core samples are unavailable. Five sandstone samples, from depths between 901.75 and 2514.7&#xa0;m, exhibited Young’s moduli (Y) ranging from 4.16 to 35.82&#xa0;GPa. These values showed excellent concordance with calibrated well-log-derived static elastic moduli, ranging from 8.68 to 32.1&#xa0;GPa, thereby indicating minimal deviations. By integrating NTM results with well log data and conventional laboratory rock mechanical characterization (LRMC), a comprehensive Rock Mechanical Model (RMM) was developed to accurately reflect subsurface conditions. Additionally, the integration of NTM with borehole image log data enhances the precision of geomechanical assessments, allowing for targeted applications of mechanical properties to specific geological units. This approach not only improves the calibration of RMM in complex subsurface porous media but also contributes to a deeper understanding of stress regimes and mechanical behavior in fractured and heterogeneous lithologies.</p>

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Calibration of Rock Mechanical Models Using Nanoindentation and Borehole Image Logs: A Case Study from the Southern Perth Basin, Western Australia

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Najmeh Jafarzadeh,
  • Alireza Rezagholilou,
  • Ali Kadkhodaie,
  • Ayub Elyasi,
  • David A. Wood,
  • Esmael Makarian,
  • Bahman Soleimani

摘要

This study evaluates the application of the Nanoindentation Test Method (NTM) for assessing the mechanical properties of rocks in the Southern Perth Basin, specifically utilizing crushed cuttings from the GSWA HW-1 well. Given the challenges associated with traditional laboratory testing, such as the need for intact core samples and the time-consuming nature of such methods, NTM provides a viable alternative for characterizing the elastic modulus and other mechanical properties of fine-grained and heterogeneous lithologies. Our findings demonstrate a strong correlation between elastic moduli derived from NTM and those obtained through uniaxial compressive strength (UCS) tests, validating the reliability of NTM in scenarios where high-quality core samples are unavailable. Five sandstone samples, from depths between 901.75 and 2514.7 m, exhibited Young’s moduli (Y) ranging from 4.16 to 35.82 GPa. These values showed excellent concordance with calibrated well-log-derived static elastic moduli, ranging from 8.68 to 32.1 GPa, thereby indicating minimal deviations. By integrating NTM results with well log data and conventional laboratory rock mechanical characterization (LRMC), a comprehensive Rock Mechanical Model (RMM) was developed to accurately reflect subsurface conditions. Additionally, the integration of NTM with borehole image log data enhances the precision of geomechanical assessments, allowing for targeted applications of mechanical properties to specific geological units. This approach not only improves the calibration of RMM in complex subsurface porous media but also contributes to a deeper understanding of stress regimes and mechanical behavior in fractured and heterogeneous lithologies.