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Seismic Frequency Variations of a Reservoir: Lessons from a Spring

Robert W. Wiley*, Peter Wilson, and Scott Peters
Apex Spectral Technology, USA
*[email protected]

In studying wave propagation and attenuation in the Earth, it is often convenient to use simplified models. One of these models is a mass, spring and dashpot to model oscillation and attenuation. By analyzing the motion of a spring Previous HitusingNext Hit different forced oscillations, we studied the effect of the Previous HitsystemNext Hit’s characteristics on the transmitted frequency. In particular, we observed that if the forced oscillations are above the Previous HitsystemNext Hit response, the predominant output will be at the Previous HitsystemNext Hit characteristic. For lithologic layers, the Previous HitsystemNext Hit characteristics depend, in part, upon the Poisson’s ratio, matrix and the fluid velocities. With reservoirs having different fluid velocities and often different Poisson’s ratios from the surrounding rock; this implies that hydrocarbon reservoirs could have a measurable spectral character based upon their unique Previous HitsystemTop or rock properties and that these characteristics could be estimated with seismic data.

 

AAPG Search and Discovery Article #90077©2008 GEO 2008 Middle East Conference and Exhibition, Manama, Bahrain