Seismic Data

The seismic data used for this study come from a marine dataset recorded at the Blake Outer Ridge, offshore from Florida and Georgia. This dataset consists of 1024 CMP gathers with a spacing, after interpolation, of 25 m. Figure 1 is a stack section of the data after migration, which shows two interesting reflectors of opposite polarity: a bottom simulating reflector (BSR) and a flat reflector. The BSR is a characteristic seismic horizon associated with the base of a methane-hydrate stability zone. Ecker 1998 has shown that this reflector marks the transition from hydrated to gas-saturated sediments. Her analysis also suggests that the flat reflector beneath the BSR marks the transition from gas-saturated to brine-saturated sediments.

 

Stack-gas-ann
Figure 1 Stack section of the data after migration