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Geophysics: Attenuation of Shear and Compressional Waves in Pierre Shale*

By
F. J. McDonal
F. J. McDonal
Magnolia Petroleum Company, Field Research Laboratory, Dallas, Texas.
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F. A. Angona
F. A. Angona
Magnolia Petroleum Company, Field Research Laboratory, Dallas, Texas.
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R. L. Mills
R. L. Mills
Summers and Mills, Inc., Dallas, Texas.
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R. L. Sengbush
R. L. Sengbush
Magnolia Petroleum Company, Field Research Laboratory, Dallas, Texas.
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R. G. Van Nostrand
R. G. Van Nostrand
§
Société de Prospection et Exploitations Pétrolières en Alsace, Paris, France.
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J. E. Whiter
J. E. Whiter
Ohio Oil Company, Littleton, Colorado.
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Published:
January 01, 2000

Abstract

Attenuation measurements were made near Limon, Colorado, where the Pierre shale is unusually uniform from depths of less than 100 ft to approximately 4,000 ft. Particle velocity wave forms were measured at distances up to 750 ft from explosive and mechanical sources. Explosives gave a well-defined compressional pulse which was observed along vertical and horizontal travel paths. A weight dropped on the bottom of a borehole gave a horizontally-traveling shear wave with vertical particle motion. In each case, signals from three-component clusters of geophones rigidly clamped in boreholes were amplified by a calibrated, wide-band system and recorded oscillographically. The frequency content of each wave form was obtained by Fourier analysis, and attenuation as a function of frequency was computed from these spectra.

For vertically-traveling compressional waves, an average of 6 determinations over the frequency range of 50–450 cps gives ∝=0.12 f. For horizontally-traveling shear waves with vertical motion in the frequency range 20–125 cps, the results are expressed by ∝ = 1.0 f. In each case attenuation is expressed in decibels per 1,000 ft of travel and f is frequency in cps. These measurements indicate, therefore, that the Pierre shale does not behave as a visco-elastic material.

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Contents

Society of Exploration Geophysicists Geophysics Reprint Series

Seismic Wave Propagation: Collected Works of J. E. White

J. E. White
J. E. White
Professor Emeritus, Colorado School of Mines
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Society of Exploration Geophysicists
Volume
21
ISBN electronic:
9781560802471
Publication date:
January 01, 2000

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