Abstract
The presence of fluids in the pore space of rocks causes wave attenuation and dispersion by the mechanism broadly known as wave-induced fluid flow (WIFF). WIFF occurs as a seismic wave that creates pressure gradients within the fluid phase, and the resulting oscillatory movement of the fluid relative to the solid is accompanied with internal friction until the fluid pressure is equilibrated. If two immiscible pore fluids with substantially different bulk moduli – such as water and gas – form patches, significant wave attenuation, and dispersion result. Their frequency dependence is controlled by the size, shape, and spatial distribution of fluid patches. We focus on the so-called mesoscopic patches referring to a length scale much larger than typical pore size and yet much smaller than the seismic wavelength.
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