<p>Due to the challenge of determining promising locations for drilling in hydrocarbon reservoirs, especially in complex geological areas, accurate assessment of reservoir quality and geomechanical properties is essential to reduce drilling risk and increase productivity. In this study, to find the optimal well placement in the Nahr-Umr Formation and reduce geological uncertainties, three-dimensional seismic data were integrated with three wellbore logs. Geomechanical parameters were extracted through pre-stack inversion and then analyzed. The parameters were normalized using the minimum–maximum method and were integrated modeling and transformed into a comprehensive index known as the total petro-geomechanical index (TPG), from which a reservoir quality map was created. Additionally, an integrated attribute was developed to predict hydrocarbon potential, which, when combined with a reservoir thickness map and a three-dimensional structural model, provided a comprehensive framework for drilling site selection. The final drilling location was located at the crest of an anticline, in an area with good reservoir quality, high hydrocarbon potential, and acceptable mechanical balance. At the selected drilling location, quantitative geomechanical analysis confirms this balance: the average Young’s modulus is 36.9 GPa, indicating sufficient rock stiffness, while the UCS value of 81.19&#xa0;MPa demonstrates moderate compressive strength. The rock density of 2.44&#xa0;g/cc falls within a stable range, and the relatively low Poisson’s ratio (0.28) reflects controlled brittleness, which under proper drilling pressure management enhances both wellbore stability and fracturing potential.</p>

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Optimal well placement in the Nahr-Umr formation using geomechanical parameter analysis from seismic data, Southwestern Iran

  • Peyman Azizi Shoshbulag,
  • Ali Kadkhodaie

摘要

Due to the challenge of determining promising locations for drilling in hydrocarbon reservoirs, especially in complex geological areas, accurate assessment of reservoir quality and geomechanical properties is essential to reduce drilling risk and increase productivity. In this study, to find the optimal well placement in the Nahr-Umr Formation and reduce geological uncertainties, three-dimensional seismic data were integrated with three wellbore logs. Geomechanical parameters were extracted through pre-stack inversion and then analyzed. The parameters were normalized using the minimum–maximum method and were integrated modeling and transformed into a comprehensive index known as the total petro-geomechanical index (TPG), from which a reservoir quality map was created. Additionally, an integrated attribute was developed to predict hydrocarbon potential, which, when combined with a reservoir thickness map and a three-dimensional structural model, provided a comprehensive framework for drilling site selection. The final drilling location was located at the crest of an anticline, in an area with good reservoir quality, high hydrocarbon potential, and acceptable mechanical balance. At the selected drilling location, quantitative geomechanical analysis confirms this balance: the average Young’s modulus is 36.9 GPa, indicating sufficient rock stiffness, while the UCS value of 81.19 MPa demonstrates moderate compressive strength. The rock density of 2.44 g/cc falls within a stable range, and the relatively low Poisson’s ratio (0.28) reflects controlled brittleness, which under proper drilling pressure management enhances both wellbore stability and fracturing potential.