Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1991-06-21
1993-03-23
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 30, 367 73, G01V 140
Patent
active
051970384
ABSTRACT:
Methods are provided which utilize a sonic tool for quantitatively determining parameters of a velocity profile of an altered zone in a rock formation traversed by a borehole. Synthetic amplitude information for the formation is generated by a computer model, by providing the computer with a proposed velocity profile for the formation, including values for parameters such as the radius of the altered zone and the acoustic velocities in the altered zone. The synthetic amplitude information is then compared with amplitude information (e.g. peak or total energy) of a compressional headwave as measured by the array sonic tool. If the comparison provides differences exceeding predetermined thresholds, the values for the parameters of the model are adjusted according to a least squares fit procedure until suitable values are found. The suitable values are then taken as the parameter values.
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Chang Shu K.
Gouilloud Michel
Foodman Marc D.
Gordon David P.
Lobo Ian J.
Schlumberger Technology Corporation
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