TY - JOUR T1 - Fine-scale gas distribution in marine sediments assessed from deep-towed seismic data A1 - Ker,Stephan A1 - Le Gonidec,Y. A1 - Marsset,Bruno A1 - Westbrook,Graham A1 - Gibert,D. A1 - Minshull,T. A. AD - IFREMER, Ctr Brest, F-29280 Plouzane, France. AD - Univ Rennes 1, CNRS, UMR 6118, F-35042 Rennes, France. AD - Univ Southampton, Natl Oceanog Ctr Southampton, Southampton SO14 3ZH, Hants, England. AD - Sorbonne Paris Cite, CNRS, UMR 7154, Inst Phys Globe Paris, F-75238 Paris, France. UR - https://archimer.ifremer.fr/doc/00175/28602/ DO - 10.1093/gji/ggt497 KW - Wavelet transform KW - Gas and hydrate systems KW - Wave propagation KW - Acoustic properties KW - Arctic region N2 - In the context of seismic imaging of gas/gas-hydrate systems, the fine-scale structure of subseabed gas-related reflections is assessed by taking advantage of the source signature of the deep-towed high-resolution SYSIF seismic device. We demonstrate the value of an original wavelet-based method and associated multiscale seismic attributes, applied to seismic data recently acquired on the western margin of the Arctic archipelago of Svalbard. From analysis in the wavelet domain, we recognize two types of gas-related reflections associated with submetre-scale distribution of gas. We identify a thin gas-charged layer associated with an apparent normal polarity reflection, and we detect gas patches associated with a reverse-polarity bright spot with frequency-dependent elastic properties at small seismic wavelengths. The results provide valuable information on the scale of features through which gas migrates and resolve ambiguities in the interpretation of the seismic data. Y1 - 2014/03 PB - Oxford Univ Press JF - Geophysical Journal International SN - 0956-540X VL - 196 IS - 3 SP - 1466 EP - 1470 ID - 28602 ER -