Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1997-05-21
1998-07-21
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 32, 364422, 16625002, 7315205, G01V 140, E21B 4900
Patent
active
057843333
ABSTRACT:
A method for determining the permeability of earth formations penetrated by a wellbore from acoustic signals measured by an acoustic wellbore logging instrument. The method includes separating components from the measured acoustic signals which represent Stoneley waves propagating through the earth formations. Signals representing Stoneley waves propagating through the same earth formations are synthesized. The separated acoustic signal components and the synthesized Stoneley wave signals are compared. The permeability is determined from differences between the synthesized Stoneley wave signals and the separated acoustic signal components. In a preferred embodiment, the step of calculating the permeability includes inversion processing a wave center frequency shift and a wave travel time delay with respect to the permeability of the earth formations.
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Cheng Arthur C. H.
Chunduru Raghu K.
Gelinsky Stephan
Tang Xiaoming
Fagin Richard A.
Moskowitz Nelson
Western Atlas International Inc.
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