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<p>The geological characteristics of a hydrocarbon reservoir, specifically, its depositional and diagenetic facies, are the primary determinants of reservoir quality. Consequently, developing an accurate geological model of the reservoir is paramount to mitigating risks in petroleum exploration. However, achieving comprehensive reservoir characterization and constructing a robust model remain challenging, largely due to data scarcity and the difficulty of integrating diverse datasets. This study integrates seismic sequence stratigraphy and structural interpretation to better delineate higher-quality reservoir sands and identify subtle hydrocarbon-bearing zones in the “Turu” Field, offshore Niger Delta. The analysis identified three complete depositional sequences: DS_1, DS_2, and DS_3, inferred from delineated system tracts: lowstand, transgressive, and highstand. Key depositional environments, such as channel sands, barrier bars, tidal flats, and shoreface sands, were successfully delineated as quality hydrocarbon-bearing zones. Spectral decomposition analysis was used to reveal features invisible on conventional seismic data. The most significant finding was the identification of a distinct, meandering channel with a NW–SE orientation, which is interpreted as a high-quality, sand-filled stratigraphic trap. This technique also helped delineate subtle faults that form part of the field's trapping mechanism. The integration of seismic sequence stratigraphy and spectral decomposition enabled the identification of subtle stratigraphic features beyond the resolution of conventional seismic interpretation. In particular, a laterally continuous, NW–SE-trending meandering channel system was delineated and interpreted as a high-quality, sand-filled stratigraphic reservoir that was previously unrecognized in the field. By benchmarking these results against established geological settings and evaluating the conditions under which the workflow is transferable, this study places the “Turu” Field within a broader context, while noting that adaptation may be required in structurally complex or data-limited environments.</p>

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Seismic Sequence Stratigraphy and Spectral Decomposition Analysis for Subtle Reservoir Delineation of “Turu” Field, Offshore Niger Delta

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • O. J. Egbokhare,
  • J. O. Amigun,
  • Haylay Tsegab Gebretsadik,
  • Olatunbosun A. Alao,
  • John Oluwadamilola Olutoki

摘要

The geological characteristics of a hydrocarbon reservoir, specifically, its depositional and diagenetic facies, are the primary determinants of reservoir quality. Consequently, developing an accurate geological model of the reservoir is paramount to mitigating risks in petroleum exploration. However, achieving comprehensive reservoir characterization and constructing a robust model remain challenging, largely due to data scarcity and the difficulty of integrating diverse datasets. This study integrates seismic sequence stratigraphy and structural interpretation to better delineate higher-quality reservoir sands and identify subtle hydrocarbon-bearing zones in the “Turu” Field, offshore Niger Delta. The analysis identified three complete depositional sequences: DS_1, DS_2, and DS_3, inferred from delineated system tracts: lowstand, transgressive, and highstand. Key depositional environments, such as channel sands, barrier bars, tidal flats, and shoreface sands, were successfully delineated as quality hydrocarbon-bearing zones. Spectral decomposition analysis was used to reveal features invisible on conventional seismic data. The most significant finding was the identification of a distinct, meandering channel with a NW–SE orientation, which is interpreted as a high-quality, sand-filled stratigraphic trap. This technique also helped delineate subtle faults that form part of the field's trapping mechanism. The integration of seismic sequence stratigraphy and spectral decomposition enabled the identification of subtle stratigraphic features beyond the resolution of conventional seismic interpretation. In particular, a laterally continuous, NW–SE-trending meandering channel system was delineated and interpreted as a high-quality, sand-filled stratigraphic reservoir that was previously unrecognized in the field. By benchmarking these results against established geological settings and evaluating the conditions under which the workflow is transferable, this study places the “Turu” Field within a broader context, while noting that adaptation may be required in structurally complex or data-limited environments.