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BSRs and Associated Reflections as an Indicator of Gas Hydrate and Free Gas Accumulation: An Example of Accretionary Prism and Forearc Basin System along the Nankai Trough, off Central Japan
Kei Baba, Yasuhiro Yamada

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Gas hydrates and free gas accumulation in the Nankai Trough were studied using seismic data. Gas migrates to the BSRs in the accretionary prism and forearc basins, with most having migration origins. BSRs are more developed in larger prisms, indicating tectonic control. In the forearc basins, BSRs are found at topographic highs and basin margins due to structural control. BSR distribution is influenced by permeable sand layers and time for gas accumulation, showing sedimentary and time controls. The study suggests that structural, tectonic, sedimentary, and time factors determine BSR distribution in the Nankai Trough.