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Estimating the Wet-Rock P-Wave Velocity from the Dry-Rock P-Wave Velocity for Pyroclastic Rocks
Pure and Applied Geophysics, 2017Seismic methods are widely used for the geotechnical investigations in volcanic areas or for the determination of the engineering properties of pyroclastic rocks in laboratory. Therefore, developing a relation between the wet- and dry-rock P-wave velocities will be helpful for engineers when evaluating the formation characteristics of pyroclastic rocks.
Sair Kahraman +2 more
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Impact of phase transitions on P wave velocities
Physics of the Earth and Planetary Interiors, 2010In regions where a high pressure phase is in equilibrium with a low pressure phase, the bulk modulus defined by the P-V relationship is greatly reduced. Here we evaluate the effect of such transitions on the P wave velocity. A model, where cation diffusion is the rate limiting factor, is used to project laboratory data to the conditions of a seismic ...
Donald J. Weidner, Li Li
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Estimation of the P-wave Velocity of the Near Surface Using Dispersion Analysis of the Guided P-wave
Proceedings, 2017We use the dispersion property of the guided P-wave to obtain a P-wave velocity model of the near surface. To calculate the phase velocity of the fundamental mode of the guided P-wave for any given geophone location (here called central geophone), we consider an array of geophones where the central geophone was in the middle of the array. The length of
K.F. Campbell +3 more
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Evolution of P-Wave Velocity in Settling Drilling Fluids
Volume 10: Petroleum Technology, 2021Abstract Drilling and completion fluids (muds) are complex suspensions that typically contain weight material (such as barite) to increase the density, and clay particles to increase the viscosity and provide yield stress. In a static column of fluid, barite will inevitably settle.
Mohammad Hossain Bhuiyan +2 more
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P-wave velocities in the earth's core: An interim report
Physics of the Earth and Planetary Interiors, 1974Abstract Recent observations of core phases made at conventional stations and seismograph arrays are summarized and evaluated to produce a series of conclusions concerning the P-wave velocity structure of the earth's core. Limits are suggested for allowable variations in P velocity in various parts of the core.
R.D. Adams, E.R. Engdahl
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The effects of fracture roughness on P-wave velocity
Engineering Geology, 2002Artificial fractures were created on three different rock samples by sawing. The fracture surfaces were in turn grooved in different directions by sawing to simulate the fracture roughness. Four different roughness types were created and a fracture roughness coefficient (FRC) was defined for each type.
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P‐wave stacking‐velocity tomography for VTI media
Geophysical Prospecting, 2002ABSTRACTA major complication caused by anisotropy in velocity analysis and imaging is the uncertainty in estimating the vertical velocity and depth scale of the model from surface data. For laterally homogeneous VTI (transversely isotropic with a vertical symmetry axis) media above the target reflector, P‐wave moveout has to be combined with other ...
Vladimir Grechka +2 more
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