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<p>Metamorphic buried hill reservoirs possess complex pore structures, making the evaluation of their effectiveness particularly challenging. This study explores the influence of lithology and stress conditions on fracture development in such reservoirs, aiming to improve predictions of effective storage spaces. Three representative metamorphic rocks from the Bohai Bay Basin: plagioclase amphibolite, gneissic granite, and monzogranite were subjected to mechanical testing under compressive and tensile stresses. Acoustic emission (AE) monitoring was used to track energy release and the spatiotemporal evolution of microfractures during deformation, complemented by thin-section analysis of post-failure samples to examine microfracture morphology and density. The results show that tensile stress more readily induces rock failure but typically produces narrow, localized damage zones, whereas compressive stress promotes the development of broader, more interconnected fracture networks. Under tensile loading, all three lithologies exhibit similar axial splitting behavior, with granitic rocks forming slightly wider fracture zones than amphibolite. Under compressive loading, distinct macroscopic failure modes are observed among the lithologies. Analysis of microfracture parameters and spatial distributions reveals that monzogranite exhibits extensive microfracture activity and wide fracture zones, indicating a higher potential for forming interconnected secondary porosity and making it the most favorable reservoir lithology among those tested. This study provides detailed insights into fracture evolution across different lithologies under varying stress conditions and offers experimental evidence to support improved predictions of effective reservoirs in deep metamorphic settings.</p>

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Fracture Characteristics and Reservoir Potential of Metamorphic Rocks in the Bohai Bay Basin Under Different Stress Conditions

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Wei Tao,
  • Lingli Guo,
  • Sanzhong Li,
  • Yuhua Wang,
  • Jingjing Zhang,
  • Shujuan Zhao

摘要

Metamorphic buried hill reservoirs possess complex pore structures, making the evaluation of their effectiveness particularly challenging. This study explores the influence of lithology and stress conditions on fracture development in such reservoirs, aiming to improve predictions of effective storage spaces. Three representative metamorphic rocks from the Bohai Bay Basin: plagioclase amphibolite, gneissic granite, and monzogranite were subjected to mechanical testing under compressive and tensile stresses. Acoustic emission (AE) monitoring was used to track energy release and the spatiotemporal evolution of microfractures during deformation, complemented by thin-section analysis of post-failure samples to examine microfracture morphology and density. The results show that tensile stress more readily induces rock failure but typically produces narrow, localized damage zones, whereas compressive stress promotes the development of broader, more interconnected fracture networks. Under tensile loading, all three lithologies exhibit similar axial splitting behavior, with granitic rocks forming slightly wider fracture zones than amphibolite. Under compressive loading, distinct macroscopic failure modes are observed among the lithologies. Analysis of microfracture parameters and spatial distributions reveals that monzogranite exhibits extensive microfracture activity and wide fracture zones, indicating a higher potential for forming interconnected secondary porosity and making it the most favorable reservoir lithology among those tested. This study provides detailed insights into fracture evolution across different lithologies under varying stress conditions and offers experimental evidence to support improved predictions of effective reservoirs in deep metamorphic settings.