For a polarity reversal to occur, the shale has to have a lower acoustic impedance than the water sand and both are required to have a higher acoustic impedance than the oil / gas sand.
42.
For a polarity reversal to occur, the shale has to have a lower acoustic impedance than the water sand and both are required to have a higher acoustic impedance than the oil / gas sand.
43.
However, due to the general equality in acoustic impedance for many types of structures in the breast ultrasound imaging detects many abnormalities or potential sites that are false positives and this limits its usefulness.
44.
Likewise, a microphone can be buried in the ground, or immersed in water if it is put in a waterproof container, but will give similarly poor performance due to the similarly bad acoustic impedance match.
45.
This is due to the ease with which low frequency sound passes from water into a body, but not into any pockets of gas in the body, which reflect the sound due to mismatched acoustic impedance.
46.
"' Acoustic impedance "'and "'specific acoustic impedance "'are measures of the opposition that a system presents to the acoustic flow resulting of an acoustic pressure applied to the system.
47.
"' Acoustic impedance "'and "'specific acoustic impedance "'are measures of the opposition that a system presents to the acoustic flow resulting of an acoustic pressure applied to the system.
48.
In a viscous medium, there will be a phase difference between the pressure and velocity, so the specific acoustic impedance \ underline { Z } will be different from the characteristic acoustic impedance { Z _ 0 }.
49.
In a viscous medium, there will be a phase difference between the pressure and velocity, so the specific acoustic impedance \ underline { Z } will be different from the characteristic acoustic impedance { Z _ 0 }.
50.
A good ( CSSI ) algorithm will produce four high-quality acoustic impedance volumes from full or post-stack seismic data : full-bandwidth impedance, bandlimited Impedance, reflectivity model, and low-frequency component.
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