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Project Blake Ridge Hydrates 3D

General

Country:

USA

Location:

Offshore, South Carolina

Blocks:

164

Coordinates:

N 31° 49' 03” / W 74° 43' 18”

Acquisition:

2000

(Re)processing:

2000

Value added Products:

2015

Data summary:

OpendTect project with 3D Seismic Data and PSTM.

Size:

1.94 GB (uncompressed), 914 MB (download)

License:

Creative Commons

Download:

Contributors

Original seismic:

Dr. W. Steven Holbrook, University of Wyoming, PI of the NSF project that acquired these data.

Value added products:

dGB Earth Sciences created the OpendTect project and computed the dip-steering volumes.

Survey Parameters

Survey type:

Only 3D

Inline range and step:

1, 95, 1

Crossline range and step:

1, 1306, 1

Z range and step:

3.4, 5.998, 0.002 Time

Inline bin size (m/line):

75

Crossline bin size (m/line):

37.5

Area (sq km):

348.93

More Info

NOTE: Derived Attributes are released under the Creative Commons license but original seismic data is released under:

NFS award 99190966

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.

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.

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, 327-330.
  • 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.
  • Available Data

    Seismic:

    • PSTM stack
    • Detailed Steering Cube
    • Background Steering Cube

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