Methods and apparatus for acoustic logging in earth formations

Details Methods and apparatus for acoustic logging in earth formations Methods and apparatus for acoustic logging in earth formations

1979-11-15

1982-05-04

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 75, 367 49, 364422, G01V 140, G01V 130

Patent

active

043285678

ABSTRACT:
An acoustic well logging system is provided for measuring the speed of propagation of all acoustic wave propagation modes of earth formations penetrated by a borehole simultaneously. A linearly changing frequency swept acoustic signal is generated and received at a spaced distance apart in a borehole. The received signal is mixed in a product forming device with the transmitted signal. Mixer product signals are low pass filtered to remove high frequency components and the resultant signals spectrum analyzed. Frequency spectra components may then be interpreted directly in terms of speed of propagation of various acoustic energy wave propagation modes.

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patent: 3330375 (1967-07-01), White
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patent: 4217659 (1980-08-01), Glenn
White, "Computed Seismic Speeds . . . Saturation", 4/75, Geophysics, vol. 40, #2.
Pichett, "Acoustic Character Logs and their Applications in Formation Evaluation", 10/10/62, pp. 659-667, 37th Annual Fall Meeting of SPB, L.A., Calif.

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