Gas hydrate and free gas detection using seismic quality factor estimates from high-resolution P-cable 3D seismic data

• DOI: 10.1190/int-2015-0023.1
• Publication Date: 2015-09-23T11:15:27Z
• Authors: Sunny Singhroha; Stefan Bünz; Andreia Plaza-Fav...; Shyam Chand
• Keywords: Anelastic attenuation factor; Centroid; Vertical seismic profile; Clathrate hydrate; Coda

We have estimated the seismic attenuation in gas hydrate and free-gas-bearing sediments from high-resolution P-cable 3D data Vestnesa Ridge on Arctic continental margin of Svalbard. a broad bandwidth (20–300 Hz), which is extremely advantageous estimating medium. The quality factor (Q), inverse attenuation, set using centroid frequency shift spectral ratio (SR) methods. method establishes relationship between change an amplitude spectrum Q value SR estimates medium by studying differential decay different frequencies. short offset characteristics are useful to continuously map for layers throughout volume. found be relatively more stable than method. values these two methods concordance with each other. document anomalies stability zone above bottom-simulating reflection (BSR) free below. Changes correlate small-scale fault systems suggesting strong structural control distribution hydrates region. argued that high spatially limited layer BSR indicate presence marine this setting. Hence, our workflow analyze large could potential technique detect directly sediments.