Data processing and interpretation schemes for a deep-towed high-frequency seismic system for gas and hydrate exploration

摘要: Abstract The deep-towed Autonomous Cable Seismic (ACS) system is a high-resolution acoustic survey designed for use in deep-water environments. This uses high-frequency source and multichannel receiver cable. A common problem the analysis of ACS data unstable positioning receivers due to ocean currents seafloor bathymetry. Since acquisition using with source–receiver positions causes destructive interference on final stack profile, correction source-receiver crucial issue. In this study, we propose method solve position thus construct an accurate profile. We used acquired Joetsu Basin Niigata, Japan, where hydrocarbon features form gas chimneys, hydrate, free have been observed. Because sidelobes signature defocus wavelet decrease bandwidth frequency content, filter focus signature. Our proposed approach considerably improved quality Even though depth information was not available all receivers, velocity spectra were well focused. Furthermore, shaping increased applied seismic attribute post-stack profile identify distributions hydrate. analyses demonstrated that accumulations are characterized by low reflection amplitude component, hydrate close can be identified its high amplitude.