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<p>Substantial hydrocarbon reserves are present in many ancient basins linked to carbonate-evaporite deposits. The hydrocarbon seals and traps for these deposits are often influenced by the stratigraphic arrangement of transitions between carbonate and evaporite facies. Thus, this study utilizes three-dimensional seismic and well data to analyze the sequence stratigraphic architecture and interpret factors controlling the development of an early Eocene dolomite-anhydrite succession formed on top of a Paleocene isolated carbonate platform in the RG Field in the tectonically complex Sirte rift basin of Libya. Three unconformity-bounded stratigraphic sequences, with a total thickness of approximately 1060 ft (323 m) and an aerial extent of at least 350 km<sup>2</sup> are delineated. Each sequence generally comprises two distinct intervals: a transgressive dolomite interval characterized by deepening upward conditions and a regressive anhydrite interval marked by shallowing upward conditions, with a maximum flooding surface separating the two. Tectonic subsidence in the Sirte Basin during the Late Cretaceous, driven by rifting, combined with repeated eustatic sea-level fluctuations to create accommodation space for the formation of dolomite-anhydrite sequences. The Paleocene isolated platform horst acted as a shallow-water antecedent topography that facilitated sediment deposition. Stratigraphic heterogeneity and sequence development of the dolomite-anhydrite succession were shaped by short-term sea-level fluctuations, likely corresponding to third-order cycles visible on the seismic scale. This research integrates evaporite sediments into sequence stratigraphy to help identify transitions between evaporite and carbonate facies, providing a comprehensive view of basin evolution. Furthermore, this research help predict hydrocarbon sources, seals, and trap configurations, thereby supporting resource exploration and exploitation efforts. The reconstructed model can act as a reference for comparable carbonate-evaporite successions worldwide.</p>

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Architectural development of early Eocene third-order dolomite-anhydrite sequences, Sirte Basin, Libya—Sequence stratigraphy and controlling factors

  • 期刊论文

  • 发表日期：

    2025年2月25日

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  • Abdalla Abdelnabi,
  • Muneer Abdalla,
  • Meeloud Abdullah,
  • Saleh Qaysi,
  • Yousf Abushalah

摘要

Substantial hydrocarbon reserves are present in many ancient basins linked to carbonate-evaporite deposits. The hydrocarbon seals and traps for these deposits are often influenced by the stratigraphic arrangement of transitions between carbonate and evaporite facies. Thus, this study utilizes three-dimensional seismic and well data to analyze the sequence stratigraphic architecture and interpret factors controlling the development of an early Eocene dolomite-anhydrite succession formed on top of a Paleocene isolated carbonate platform in the RG Field in the tectonically complex Sirte rift basin of Libya. Three unconformity-bounded stratigraphic sequences, with a total thickness of approximately 1060 ft (323 m) and an aerial extent of at least 350 km2 are delineated. Each sequence generally comprises two distinct intervals: a transgressive dolomite interval characterized by deepening upward conditions and a regressive anhydrite interval marked by shallowing upward conditions, with a maximum flooding surface separating the two. Tectonic subsidence in the Sirte Basin during the Late Cretaceous, driven by rifting, combined with repeated eustatic sea-level fluctuations to create accommodation space for the formation of dolomite-anhydrite sequences. The Paleocene isolated platform horst acted as a shallow-water antecedent topography that facilitated sediment deposition. Stratigraphic heterogeneity and sequence development of the dolomite-anhydrite succession were shaped by short-term sea-level fluctuations, likely corresponding to third-order cycles visible on the seismic scale. This research integrates evaporite sediments into sequence stratigraphy to help identify transitions between evaporite and carbonate facies, providing a comprehensive view of basin evolution. Furthermore, this research help predict hydrocarbon sources, seals, and trap configurations, thereby supporting resource exploration and exploitation efforts. The reconstructed model can act as a reference for comparable carbonate-evaporite successions worldwide.