Method and apparatus for detecting and evaluating borehole wall

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type

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367 25, 367 26, 367 33, G01V 100

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048706272

ABSTRACT:
A method and apparatus are described for generating a quick look display of an acoustic investigation of a borehole wherein a parameter of interest is derived from vertically spaced sonic receivers and displayed in a laterally continuous display log where the parameter values from respective receivers are recorded at preassigned positions. A fracture sensitive parameter is measured such as the energy in a low frequency Stoneley wave and when the parameter values are laterally recorded areas indicative of fractures become visually enhanced particularly with a laterally expanded display log. Techniques for the detection and evaluation of fractures are described.

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patent: 4607352 (1986-08-01), Seeman et al.
"Semblance Processing of Borehole Acoustic Array" Data-Geophysics vol. 49, No. 3, Mar., 1984.
"Synthetic Microseismograms: Logging in Porous Formations" Geophysics, vol. 39, No. 1, Feb., 1974.
"The Long Spaced Acoustic Logging Tool" SPWLA 25th Annual Logging Symposium, Jun. 10-13, 1984.
"Investigation of Acoustic Boundary Waves and Interference Patterns as Techniques for Detecting Fractures" Journal of Petroleum Technology, 1978.
"Permeability Profiles from Acoustic Logging" Journal of Petroleum Technology, 1977.

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