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<p>The Ordovician to Devonian strata of the Setul Group in the northern region of Peninsular Malaysia represents medium- to thick-bedded, white to grayish limestone rich in biota components. A detailed study of microfacies analysis and diagenetic investigation revealed eleven microfacies and five diagenetic histories. The recognized microfacies include two mudstone, two wackestone, two packestone, three grainstone, chert and carbonaceous shale. The microfacies and their associations represent a homoclinal ramp depositional setting designated on the basis of the rock components. The Setul Group has undergone extensive diagenetic change as a result of numerous occurrences that affected the primary and secondary porosities. Micritization, cementation, neomorphism, compaction, and dolomitization are examples of acknowledged diagenetic changes. The petrographic features reveals that the carbonate rock is modified in phreatic zones and&#xa0;involves early to late diagenetic evolution. The microfacies and diagenetic alterations indicated that the Setul Group developed in a shallow marine to deep oceanic setting. The process commenced with siliciclastic rocks originating from terrestrial sources and progressed to carbonate sediments in the abyssal plain. Collectively, these diagenetic processes play a crucial role in determining the reservoir quality of carbonate formations by influencing both primary and secondary porosity characteristics. Understanding these relationships is vital for effective reservoir characterization and management.</p>

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Microfacies characterization and diagenetic pathways of the Ordovician to Devonian Setul Group carbonates: implications for homoclinal ramp depositional dynamics in Northern Peninsular Malaysia

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • Nurul Afifah Mohd Radzir,
  • Mohammad Ezanie Abu Samah,
  • Che Aziz Ali,
  • Kamal Roslan Mohamed

摘要

The Ordovician to Devonian strata of the Setul Group in the northern region of Peninsular Malaysia represents medium- to thick-bedded, white to grayish limestone rich in biota components. A detailed study of microfacies analysis and diagenetic investigation revealed eleven microfacies and five diagenetic histories. The recognized microfacies include two mudstone, two wackestone, two packestone, three grainstone, chert and carbonaceous shale. The microfacies and their associations represent a homoclinal ramp depositional setting designated on the basis of the rock components. The Setul Group has undergone extensive diagenetic change as a result of numerous occurrences that affected the primary and secondary porosities. Micritization, cementation, neomorphism, compaction, and dolomitization are examples of acknowledged diagenetic changes. The petrographic features reveals that the carbonate rock is modified in phreatic zones and involves early to late diagenetic evolution. The microfacies and diagenetic alterations indicated that the Setul Group developed in a shallow marine to deep oceanic setting. The process commenced with siliciclastic rocks originating from terrestrial sources and progressed to carbonate sediments in the abyssal plain. Collectively, these diagenetic processes play a crucial role in determining the reservoir quality of carbonate formations by influencing both primary and secondary porosity characteristics. Understanding these relationships is vital for effective reservoir characterization and management.