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  • 136-842C; 136-843A; Density, wet bulk; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg136; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Velocity, compressional wave; Velocity, shear wave  (1)
  • elastic constants
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  • 1
    Electronic Resource
    Electronic Resource
    Elastic constants and velocity surfaces of indurated anisotropic shales (1994)
    Springer
    Surveys in geophysics 15 (1994), S. 481-494 
    Details
    ISSN: 1573-0956
    Keywords: Vp ; vs ; laboratory ; anisotropy ; shales ; elastic constants ; velocity surfaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The velocities of two Devonian-Mississippian shales have been measured to confining pressures of 200 MPa in a laboratory study of anisotropy and wave propagation. Both samples were found to be transversely isotropic at elevated pressures with the main symmetry axis perpendicular to bedding. The elastic constants of the shales were used to calculate phase and group velocity surfaces as a function of angle to the bedding normal. Multiple velocity measurements in non-symmetry directions, not undertaken in previously published studies of shales, have been used to confirm features observed on calculated velocity surfaces. It is demonstrated that velocities measured in non-symmetry directions are phase velocities. Group velocities were found to be significantly lower than the corresponding phase velocities of the shales due to their high anisotropies. Shear wave splitting was found to be negligible for propagation directions within approximately 30° of the bedding normals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690171
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    Paper (German National Licenses)
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    (Table 1) Compressional- and share-wave velocieties at elevated confining pressure of ODP Holes 136-842C and 136-843A (1993)
    PANGAEA
    In:  Supplement to: Wilkens, Roy H; Christensen, Nikolas I; Collins, John A (1993): Seismic properties and reflectivity of North Pacific Ocean cherts. In: Wilkens, RH; Firth, J; Bender, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 136, 99-104, https://doi.org/10.2973/odp.proc.sr.136.210.1993
    Details
    Publication Date: 2024-01-09
    Description: Identification of a sediment/basement contact using seismic reflection recordings has proven to be extremely difficult in wide areas of the North Pacific Ocean owing to the presence of massive, highly reflective chert layers within the sediment column. Leg 136 of the Ocean Drilling Program recovered coherent pieces of chert of sufficient size for the first comprehensive laboratory measurements of the seismic properties of this material. Compressional-wave velocities of six samples at 40-MPa confining pressure averaged 5.33 km/s, whereas shear-wave velocities at the same pressure averaged 3.48 km/s. Velocities were independent of porosity, which ranged from 5% to 13%, suggesting that pores within the samples were mostly high aspect ratio vugs as opposed to low aspect ratio cracks. Back-scattered electron images made with a scanning electron microscope confirmed this observation. Acoustic impedances were calculated for the chert samples and from shipboard measurements of the red clay sediment overlying the chert layers. An extremely large compressional-wave reflection coefficient (0.73) characterized the interface between the two lithologies. A synthetic seismogram was calculated using chert and typical pelagic carbonate properties to illustrate the influence of chert layers on a marine seismic-reflection section. Compressional-wave to shear-wave velocity ratios of the chert samples (Vp/Vs =1.53) are close to that of single-crystal quartz in spite of variable porosity. Shear-wave reflection coefficients are estimated to be approximately 0.94. A compressional-wave reflection coefficient for a basement/sediment (carbonate) interface is estimated to be approximately 0.50, significantly less than that of sediment/chert.
    Keywords: 136-842C; 136-843A; Density, wet bulk; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg136; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Velocity, compressional wave; Velocity, shear wave
    Type: Dataset
    Format: text/tab-separated-values, 132 data points
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    DATA PANGAEA
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