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Blake Ridge Hydrates 3D

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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 Summary3D 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.
  • More information can be found at: http://www.ig.utexas.edu/sdc/cruise.php?cruiseIn=ew0008


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 Range195step 1
Crossline Range11306step 1
Bin size (m) [inl/xl]7537.5 
Z Range (ms)25025998step 2
Z Range (m)05998step 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.