Method and apparatus for deriving compensated measurements in a

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging

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367 28, 367911, 181102, G01V 140

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active

043464602

ABSTRACT:
A technique for producing measurements of physical characteristics of subsurface media near a borehole penetrating the earth is disclosed that uses multiple transducers positioned along a borehole tool. A number of transducers of a first type, such as transmitters, are separated from each other along the tool by a preselected separation, and a number of transducers of a second type, such as receivers, are separated from each other by the same separation and are positioned on the tool at a preselected distance from the transducers of the first type. The technique contemplates the use of appropriate circuitry for producing measurements, using different combinations of transducers, of physical characteristics of the subsurface media at different positions along the borehole.
Furthermore, different combinations of measurements produced at different borehole positions may be compared or combined to produce improved measurements that are compensated for borehole effects and other errors.

REFERENCES:
patent: 3900824 (1975-08-01), Trouiller et al.
patent: 3978939 (1976-09-01), Trouiller
patent: 4040001 (1977-08-01), Vivet et al.
patent: 4042907 (1977-08-01), Trouiller et al.

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