Blake Ridge Hydrates 3D
General
| Country: | USA |
| Location: | Offshore, South Carolina |
| ODP Leg: | 164 |
| Coordinates: | N 31 49′ 03″ / W 74° 43′ 18″ view in Google Earth |
| Year: | 2000 |
| Data Summary | 3D Seismic Data, PSTM and PSDM |
| Size: | 1.94 GB (uncompressed), 914 MB (download) |
| License: | Original data is in public domain, NFS award 99190966. Interpretations and derived volumes: © dGB Earth Sciences, released under Creative Commons Attribution-ShareAlike 3.0 Unported License. |
Contributor
- Dr. W. Steven Holbrook, University of Wyoming, PI of the NSF project that acquired these data.
- dGB Earth Sciences contributed with minor cleanup of the data as well as derived volumes.
Geological Features
The Blake Ridge is one of the best-studied methane hydrate systems on
Earth. Here a fine-grained sediment drift deposit hosts a significant
quantity of methane hydrate and methane gas. In this data volume, a clear
bottom-simulating reflection (BSR) marks the hydrate/gas phase boundary, and
numerous bright spots beneath the BSR indicate a thick, complex free gas
zone. In addition, this volume displays the interactions between the
hydrate/gas system and the compaction normal faulting and sediment waves
that characterize the sediments.
Applicable Techniques
Attributes
- Energy
- Similarity
Plugins
- Dip-Steering
- Neural Networks
- SSIS
- Spectral Blueing
- Coloured Inversion
Equipment
This data was acquired using a single, 4-km-long streamer, with
streamer feathering used to fill in the 3D bins. The source was a small
array of two 105/105 cu. in. GI guns.
Survey parameters
| Inline Range | 1 | 95 | step 1 |
| Crossline Range | 1 | 1306 | step 1 |
| Bin size (m) [inl/xl] | 75 | 37.5 | |
| Z Range (ms) | 2502 | 5998 | step 2 |
| Z Range (m) | 0 | 5998 | step 2 |
| Size (km) | ~126 x 112 |
Available Data
Seismic Data:
PSTM stack Detailed Steering volume Background Steering Volume
References
Hornbach, M. J., D. M. Saffer, W. S. Holbrook, H. J. A. Van Avendonk, and A. R. Gorman (2008), Three-dimensional seismic imaging of the Blake Ridge methane hydrate province: Evidence for large, concentrated zones of gas hydrate and morphologically driven advection, J. Geophys. Res.-Solid Earth, 113(B7), 15.
Hornbach, M. J., D. M. Saffer, and W. S. Holbrook (2004), Critically pressured free-gas reservoirs below gas-hydrate provinces, Nature, 427(6970), 142–144.
Gorman, A. R., W. S. Holbrook, M. J. Hornbach, K. L. Hackwith, D. Lizarralde, and I. A. Pecher (2002), Migration of methane gas through the hydrate stability zone in a low-flux hydrate province, Geology, 30, 327330.
Holbrook, W. S., A. R. Gorman, M. J. Hornbach, K. L. Hackwith, J. W. Nealon, D. Lizarralde, and I. A. Pecher (2002), Seismic detection of marine methane hydrate, The Leading Edge, 21, 686 689.
Holbrook, W. S., D. Lizarralde, I. A. Pecher, A. R. Gorman, K. L. Hackwith, M. Hornbach, and D. Saffer (2002), Escape of methane gas through sediment waves in a large methane hydrate province, Geology, 30, 467 470.
Hornbach, M. J., W. S. Holbrook, A. R. Gorman, K. L. Hackwith, D. Lizarralde, and I. A. Pecher (2003), Direct seismic detection of methane hydrate on the Blake Ridge, Geophysics, 68, 92 100.