Diverse gas composition controls the Moby-Dick gas hydrate system in the Gulf of Mexico

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چکیده

Abstract In marine basins, gas hydrate systems are usually identified by a bottom simulating reflection (BSR) that parallels the seafloor and coincides with base of stability zone (GHSZ). We present newly discovered system, Moby-Dick, located in Ship Basin northern Gulf Mexico. seismic data, we observe channel-levee complex consistent phase reversal BSR extending over an area ?14.2 km2, strongly suggesting presence hydrate. contrast to classical observations, Moby-Dick abnormally shoals 150 m toward from west east, which contradicts northward-shallowing seafloor. argue likely cause shoaling is gradually changing mix across basin, containing heavier hydrocarbons transitioning methane east. Our study indicates such abnormal BSRs can be controlled gradual changes influencing shape GHSZ kilometers on basin scale.

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ژورنال

عنوان ژورنال: Geology

سال: 2021

ISSN: ['0091-7613', '1943-2682']

DOI: https://doi.org/10.1130/g49310.1