Research on Seismic Wave Attenuation in Gas Hydrates Layer Using Vertical Cable Seismic Data

Estimation of Seismic Attenuation and Gas Hydrate Concentration From Surface Seismic Data at Hydrate Ridge, Cascadia Margin

“…The Q values of the fine‐grained clay‐dominated sediments in our study are in the range of 20–80 (Figure 10a; Figures S1–S3 in Supporting Information S1), which are comparable with those at the Vestnesa Ridge in Svalbard (Singhroha et al., 2016), and the Shenhu area of South China Sea (X. Wang et al., 2018), but are lower than those in the Blake Ridge in America (Wood et al., 2000) and the Krishna‐Godavari Basin in India (e.g., Dewangan et al., 2014). Different mineralogy, sediment compaction and porosity between these regions could all contribute to this difference.…”

“…Conversely, attenuation was suppressed due to the gas hydrate presences in the Blake Ridge in America (Wood et al, 2000), the Svalbard site of Norway (Rossi et al, 2007;Westbrook et al, 2008), the Krishna-Godavari Basin in India (Dewangan et al, 2014;Jaiswal et al, 2012;Jyothi et al, 2017), the Vestnesa Ridge in Svalbard (Singhroha et al, 2016), and the Shenhu area in the South China Sea (X. Wang et al, 2018). By examining these field studies, Liu et al (2022) suggested that the different gas hydrate morphologies are the major causes of the diverse attenuation anomalies.…”

“…Heightened attenuation in the GHBS has been reported from laboratory experiments (Best et al., 2013; Priest et al., 2006), and field data in the Mallik site in Canada and the Nankai Trough in Japan (Bellefleur et al., 2007; Guerin & Goldberg, 2002; Matsushima, 2005; Pratt et al., 2005). Conversely, attenuation was suppressed due to the gas hydrate presences in the Blake Ridge in America (Wood et al., 2000), the Svalbard site of Norway (Rossi et al., 2007; Westbrook et al., 2008), the Krishna‐Godavari Basin in India (Dewangan et al., 2014; Jaiswal et al., 2012; Jyothi et al., 2017), the Vestnesa Ridge in Svalbard (Singhroha et al., 2016), and the Shenhu area in the South China Sea (X. Wang et al., 2018). By examining these field studies, Liu et al.…”

Hydrate-Bearing Sediment Imaging of Ghost Reflection in Vertical Cable Seismic Data Using Seismic Interferometry

“…Derived from defence research, the VCS method was successfully applied to conduct offshore seismic survey, for highquality subsalt imaging [3,7], for low-angle fault scarp imag-ing and assessment of remaining exploration potential [8], for hydrothermal deposit exploration [5], for seafloor massive sulphide survey [9][10][11][12], and for natural gas hydrate exploration [4,[13][14][15]. All these applications reveal that the VCS technique is an effective approach to exploiting and developing the complex offshore oil and gas fields, which can provide superior seismic image compared with conventional marine seismic method.…”