Dynamic modeling of rock springs oil shale using a homogeneous equivalent maxwell model

Munson, D.E.; Young, Elizabeth G. Stallings

doi:10.1016/0148-9062(77)90739-2

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Colorado Oil Shale1

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1980

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“…Since the velocities show no rapid changes at low pressures and the Q values are constant, one may assume that these properties are not controlled by microcracks. The presence of kerogen, on the other hand, seems to play an important role in determining both the elastic and anelastic response of the oil shale [Munson and Young, 1977]. A possible mechanism to explain the oil shale data will be discussed in the next section.…”

Section: Colorado Oil Shalementioning

confidence: 99%

Ultrasonic P and S wave attenuation in dry and saturated rocks under pressure

Johnston¹,

Toksöz²

1980

J. Geophys. Res.

172

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Ultrasonic P and S wave Q values as functions of hydrostatic pressure are presented for the Berea and Navajo sandstones, Bedford limestone, and Colorado oil shale. In most cases the attenuation was obtained for both dry and water‐saturated samples. Q is determined by measuring the attenuation of the rock sample relative to a high Q standard of identical geometry using Fourier spectral ratios. The data show that Q increases with pressure, the rate of increase being dependent on rock type and crack density and distribution. Qs is about equal to or larger than Qp for dry rocks and less than Qp for saturated rocks. In all cases, Q for saturated rocks are lower than for dry samples. The attenuation in the oil shale shows extreme anisotropy.

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Section: Colorado Oil Shalementioning

confidence: 99%