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|a E 1.99:834452
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|a SEISMIC ATTENUATION FOR RESERVOIR CHARACTERIZATION.
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|a Pittsburgh, Pa. ;
|a Morgantown, W.Va. :
|b National Energy Technology Laboratory (U.S.) ;
|a Oak Ridge, Tenn. :
|b Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
|c 2002.
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| 300 |
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|a 12 pages.
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| 336 |
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|a text
|b txt
|2 rdacontent
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|a computer
|b c
|2 rdamedia
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|a online resource
|b cr
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|a Published through the Information Bridge: DOE Scientific and Technical Information.
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| 500 |
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|c 07/01/2002.
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|a M.T. Taner; Jack Dvorkin; Gary Mavko; Joel Walls.
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|a Rock Solid Images (US)
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|a (US)
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|a In fully-saturated rock and at ultrasonic frequencies, the microscopic squirt flow induced between the stiff and soft parts of the pore space by an elastic wave is responsible for velocity-frequency dispersion and attenuation. In the seismic frequency range, it is the macroscopic cross-flow between the stiffer and softer parts of the rock. We use the latter hypothesis to introduce simple approximate equations for velocity-frequency dispersion and attenuation in a fully water saturated reservoir. The equations are based on the assumption that in heterogeneous rock and at a very low frequency, the effective elastic modulus of the fully-saturated rock can be estimated by applying a fluid substitution procedure to the averaged (upscaled) dry frame whose effective porosity is the mean porosity and the effective elastic modulus is the Backus-average (geometric mean) of the individual dry-frame elastic moduli of parts of the rock. At a higher frequency, the effective elastic modulus of the saturated rock is the Backus-average of the individual fully-saturated-rock elastic moduli of parts of the rock. The difference between the effective elastic modulus calculated separately by these two methods determines the velocity-frequency dispersion. The corresponding attenuation is calculated from this dispersion by using (e.g.) the standard linear solid attenuation model.
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| 538 |
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|a Available via the World Wide Web.
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| 500 |
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|a Electronic resource.
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| 650 |
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4 |
|a Ultrasonic Waves.
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| 650 |
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4 |
|a Attenuation.
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| 650 |
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4 |
|a Frequency Range.
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| 650 |
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|a Porosity.
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| 650 |
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|a Reservoir Rock.
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| 650 |
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|a Calculation Methods.
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| 650 |
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|a Water Saturation.
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| 650 |
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|a Earth sciences.
|0 http://id.loc.gov/authorities/subjects/sh85040468
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| 710 |
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|a National Energy Technology Laboratory (U.S.)
|0 http://id.loc.gov/authorities/names/n00008417
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| 710 |
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information.
|0 http://id.loc.gov/authorities/names/n84003987
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| 856 |
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|u http://www.osti.gov/servlets/purl/834452-OfRPu2/native/
|z Connect to online resource - All users
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|p Non-Circulating
|a Michigan State University-Library of Michigan
|b Michigan State University
|c MSU Online Resource
|d MSU Government Documents Online Resource
|t 0
|e E 1.99:834452
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|j Online
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|
