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<p>Microbial Enhanced Oil Recovery (MEOR) is considered a promising tertiary recovery technique leveraging the metabolic activities of microorganisms to mobilize residual oil trapped in reservoirs after primary and secondary recovery. Often, it is considered more environmentally friendly and potentially cost-effective than conventional thermal or chemical EOR methods. This review delves into the fundamental mechanisms driving oil mobilization and discusses key experimental findings from laboratory studies and field trials. Furthermore, the review assesses the application of MEOR strategies for Iraqi oilfields, outlining the future directions for research and development in this interdisciplinary field. The findings show that the efficient MEOR process required conditions for the sandstone reservoirs, a limit of depth between 3030 and 3335&#xa0;m, permeability of 400–1000 mD, porosity of 20–22%, and API for oil of 34–42, while for the limestone reservoirs, the depth should be 1000 to 3500&#xa0;m, permeability 75–200 mD, porosity of 20%, and API for oil of 14–42. Dolomitic reservoirs require a depth of 1440-3050&#xa0;m, permeability of 0.1–10 mD, porosity of 8–15%, and 10–29 API for oil. An increase in Recovery Factor % (RF) by MEOR in Middle East oil fields, about 70% in Egyptian and Omani fields, and 90% in the UAE, while in the Iranian fields it was about 50, encourages the use of this method in the Iraqi fields. MEOR can be applied to the Mishrif and Zubair formations in the Rumaila and West Qurna Iraqi oil fields. However, the conditions for this application do not extend to the Mauddud formation across all southern Iraqi fields.</p>

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An in-depth insight into microbial-enhanced oil recovery: a systematic review and potential application in the Middle East and Southern Iraqi fields

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月11日

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  • Ahmed N. Al-Dujaili,
  • Zahraa Ayad Mahdi,
  • Maaly S. Asad,
  • Mohammed Thamer,
  • Arshad Noori Al-Dujaili,
  • Mays Yaseen Taher

摘要

Microbial Enhanced Oil Recovery (MEOR) is considered a promising tertiary recovery technique leveraging the metabolic activities of microorganisms to mobilize residual oil trapped in reservoirs after primary and secondary recovery. Often, it is considered more environmentally friendly and potentially cost-effective than conventional thermal or chemical EOR methods. This review delves into the fundamental mechanisms driving oil mobilization and discusses key experimental findings from laboratory studies and field trials. Furthermore, the review assesses the application of MEOR strategies for Iraqi oilfields, outlining the future directions for research and development in this interdisciplinary field. The findings show that the efficient MEOR process required conditions for the sandstone reservoirs, a limit of depth between 3030 and 3335 m, permeability of 400–1000 mD, porosity of 20–22%, and API for oil of 34–42, while for the limestone reservoirs, the depth should be 1000 to 3500 m, permeability 75–200 mD, porosity of 20%, and API for oil of 14–42. Dolomitic reservoirs require a depth of 1440-3050 m, permeability of 0.1–10 mD, porosity of 8–15%, and 10–29 API for oil. An increase in Recovery Factor % (RF) by MEOR in Middle East oil fields, about 70% in Egyptian and Omani fields, and 90% in the UAE, while in the Iranian fields it was about 50, encourages the use of this method in the Iraqi fields. MEOR can be applied to the Mishrif and Zubair formations in the Rumaila and West Qurna Iraqi oil fields. However, the conditions for this application do not extend to the Mauddud formation across all southern Iraqi fields.