Comparative Analysis of Wave Spectral Bandwidths Across Major Offshore Oil and Gas Regions

Abstract

Wave spectral bandwidth is a critical parameter in offshore engineering, influencing the dynamic responses of floating structures, moorings, and risers in oil and gas exploration regions. This study presents a comparative analysis of wave spectral bandwidths across major offshore regions including the North Sea, West Africa, the Gulf of Mexico, Brazil, and the Timor Sea. Using representative 100-year return period storm data, spectral parameters were analyzed to determine spectral moments (m0, m2, m4) and corresponding bandwidths. Results reveal significant regional differences: North Sea spectra are broad-banded, resulting in multi- frequency excitation of floating production systems, while Brazilian seas exhibit relatively narrow spectra due to swell dominance. West African and Gulf of Mexico conditions show intermediate bandwidth characteristics, affecting the predictability of structural responses. The study highlights the importance of regional spectral characterization in FPSO design, offshore structural safety, and operational planning, with implications for risk-based design in harsh environments.

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