Goldberg, David S. et al. (2005): Velocity analysis of LWD sonic data in turbidites and hemipelagic sediments offshore Japan, ODP Sites 1173 and 808

Leg/Site/Hole:
ODP 190
ODP 196
ODP 190 1173
ODP 196 1173
ODP 131 808
ODP 196 808
Identifier:
2005-060953
georefid
10.2973/odp.proc.sr.190196.352.2005
doi
Creator:
Goldberg, David S.
Lamont-Doherty Earth Observatory, Borehole Research Group, Palisades, NY, United States
author
Cheng, Arthur
University of Tokyo, Japan
author
Gulick, Sean P. S.
University of Texas at Austin, United States
author
Blanch, Joakim
author
Byun, Joong Moo
author
Identification:
Velocity analysis of LWD sonic data in turbidites and hemipelagic sediments offshore Japan, ODP Sites 1173 and 808
2005
In: Moore, Gregory F., Taira, Asahiko, Klaus, Adam, Becker, Keir, Becker, Luann, Boeckel, Babette, Cragg, Barry A., Dean, P. Allison, Fergusson, Christopher L., Henry, Pierre, Hirano, Satoshi, Hisamitsu, Toshio, Hunze, Sabine, Kastner, Miriam, Maltman, Alex J., Morgan, Julia K., Murakami, Yuki, Saffer, Demian M., Sanchez-Gomez, Mario, Screaton, Elizabeth J., Smith, David C., Spivack, Arthur J., Steurer, Joan F., Tobin, Harold J., Ujiie, Kohtaro, Underwood, Michael B., Wilson, Moyra E. J., Mikada, Hitoshi, Moore, J. Casey, Austin, Gary L., Bangs, Nathan L. B., Bourlange, Sylvain, Broilliard, Julien, Brueckmann, Warner, Corn, Ernest Ray, Davis, Earl E., Flemings, Peter B., Goldberg, David S., Gulick, Sean P. S., Hansen, Martin Bak, Hayward, Nathan, Hills, Denise J., Ienaga, Masanori, Ishiguro, Hiroyasu, Kinoshita, Masataka, Macdonald, Robert D., McNeill, Lisa, Obana, Shinichi, Hong, Ong Swee, Peacock, Sheila, Pettigrew, Thomas L., Saito, Saneatsu, Sawa, Takao, Thaiprasert, Nophawit, Tsurumi, Hikaru, Proceedings of the Ocean Drilling Program; scientific results; deformation and fluid flow processes in the Nankai Trough accretionary prism; coring, logging while drilling and advanced CORKs covering Legs 190 to 196 of the cruises of the drilling vessel JOIDES Resolution; Sydney, Australia, to Yokohama, Japan, Sites 1173-1178, 23 May-16 July 2000; and Keelung, Taiwan, to Kochi, Japan, Sites 808-1173, 2 May-1 July 2001
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
190/196
Logging-while-drilling (LWD) sonic data collected during Ocean Drilling Program Leg 196 in low-velocity turbidites and hemipelagic sediments were analyzed to extract P-wave velocity using high-resolution dispersion analysis and appropriate tool and borehole modeling. The sonic waveform data show an overall increase in velocity with decreasing frequency. Numerical modeling indicates that velocity computations should be made in the frequency band of highest waveform energy. Estimates of velocity using this approach compare well with core data and wireline sonic logs at the reference site (Site 1173), whereas conventional semblance analysis and dispersion corrections using a look-up table tend to underestimate the velocity by as much as 10%. Synthetic seismograms computed using this approach from the LWD sonic data correlate well to seismic reflection profiles at Site 1173. At Site 808, correlation of synthetic seismograms from our LWD data analysis suggests that transverse velocity anisotropy is present in the prism sediments. High-resolution dispersion analysis is recommended for velocity analysis from LWD sonic data in similar low-velocity marine sediments.
English
Serial
Coverage:Geographic coordinates:
North:32.2111
West:134.5634East: 135.0200
South:32.1500
Oceanography; Applied geophysics; acoustical logging; acoustical methods; geophysical methods; hemipelagic environment; Leg 190; Leg 196; marine environment; marine sediments; Nankai Trough; North Pacific; Northwest Pacific; numerical models; Ocean Drilling Program; ODP Site 1173; ODP Site 808; Pacific Ocean; sediments; seismic methods; seismograms; synthetic seismograms; turbidite; waveforms; well-logging; West Pacific;
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