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<p>This research provides a detailed petrophysical analysis of the Early Cretaceous Sarir Formation, examining data from six wells in the Sarir C-North Field, located in the southeastern region of Libya’s Sirte Basin. By integrating wireline logs (gamma ray, spectral gamma ray, density, neutron, resistivity, repeat formation tester) and core data to reveal the significant vertical heterogeneity and evaluate the reservoir intervals through advanced analysis of the provided data. It identifies lithology, clay mineralogy, shale distribution, and reservoir properties. Spectral gamma ray analysis identified chlorite, illite, and mixed-layer clays, while Thomas-Stieber plots revealed laminated-dispersed shale dominating Upper/Middle Sarir units. Reservoir parameters—including shale volume (Vsh), effective porosity (∅eff), water saturation (Sw), and net pay—were quantified using log-derived models calibrated to core measurements (R²=0.86 for porosity). The integrated analysis successfully characterized the reservoir’s key properties and fluid distribution. The Pickett plot provided a reliable measurement of formation water resistivity, which was further confirmed by drill-stem test (DST) data. Application of standardized cutoffs from core analysis clearly defined the productive net pay zones, with the Variegated Shale unit identified as the most porous interval. Strong predictive relationships between permeability and porosity were established for each reservoir unit, enabling accurate flow capacity estimates. Fluid contacts were precisely determined through pressure gradient analysis, defining the transition zones between hydrocarbons and water. Evaluation of vertical and lateral property variations revealed significant reservoir heterogeneity. The Upper Sarir unit demonstrates favorable reservoir quality, while the Middle Sarir unit shows increased water presence and reduced net pay proportion. This heterogeneity underscores the importance of unit-specific development strategies. The study improves reservoir characterization and reduces uncertainty in field development strategies.</p>

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Integrated Core-Log petrophysical evaluation of the Sarir formation reservoir Units, southeastern Sirte Basin, Libya

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月29日

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  • Hamzah S. Amir,
  • Mohamed Fathy,
  • Mohamed Reda,
  • Taher Mostafa

摘要

This research provides a detailed petrophysical analysis of the Early Cretaceous Sarir Formation, examining data from six wells in the Sarir C-North Field, located in the southeastern region of Libya’s Sirte Basin. By integrating wireline logs (gamma ray, spectral gamma ray, density, neutron, resistivity, repeat formation tester) and core data to reveal the significant vertical heterogeneity and evaluate the reservoir intervals through advanced analysis of the provided data. It identifies lithology, clay mineralogy, shale distribution, and reservoir properties. Spectral gamma ray analysis identified chlorite, illite, and mixed-layer clays, while Thomas-Stieber plots revealed laminated-dispersed shale dominating Upper/Middle Sarir units. Reservoir parameters—including shale volume (Vsh), effective porosity (∅eff), water saturation (Sw), and net pay—were quantified using log-derived models calibrated to core measurements (R²=0.86 for porosity). The integrated analysis successfully characterized the reservoir’s key properties and fluid distribution. The Pickett plot provided a reliable measurement of formation water resistivity, which was further confirmed by drill-stem test (DST) data. Application of standardized cutoffs from core analysis clearly defined the productive net pay zones, with the Variegated Shale unit identified as the most porous interval. Strong predictive relationships between permeability and porosity were established for each reservoir unit, enabling accurate flow capacity estimates. Fluid contacts were precisely determined through pressure gradient analysis, defining the transition zones between hydrocarbons and water. Evaluation of vertical and lateral property variations revealed significant reservoir heterogeneity. The Upper Sarir unit demonstrates favorable reservoir quality, while the Middle Sarir unit shows increased water presence and reduced net pay proportion. This heterogeneity underscores the importance of unit-specific development strategies. The study improves reservoir characterization and reduces uncertainty in field development strategies.