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While fluid percolates through porous media in infinitesimal volume 

LaTeX Math Inline
body\delta V
 generates the noise of the power
LaTeX Math Inline
body\delta N
 in a wide frequency range:

LaTeX Math Block
anchorN
alignmentleft
\delta N = A(f) \cdot {\bf u} \cdot \nabla p \cdot \delta V 

where

LaTeX Math Inline
body--uriencoded--%7B\bf u%7D

flow velocity

LaTeX Math Inline
bodyp

fluid pressure


LaTeX Math Inline
bodyA(f)

normalised noise spectrum, 

LaTeX Math Inline
body--uriencoded--\displaystyle \int_0%5e\infty A(f) \, df = 1



See also

...

Reservoir Noise