Induction logging and apparatus utilizing skew signal measuremen

Selective cutting (e.g. – punching) – With means to impose randomly actuated control of... – Embodying means to detect indicium in work or pattern

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324343, G01V 328, G01V 338

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049806432

ABSTRACT:
A second receiver coil system (45a,45b) at right angles to the primary receiver coil system (40) in an induction logging tool (10) detects the skewness in the logging tool field pattern caused by the presence of assymmetrical formation structures (30). This skew signal, which provides a composite measure of the asymmetry of the formation structures (30), can be used to correct for horns produced in formation conductivity logs when the logging tool sonde (14) traverses interfaces between dipping beds. The skew signal can also be used to determine the dip and strike angles between such dipping beds.

REFERENCES:
patent: 3187252 (1965-06-01), Hungerford
patent: 3510757 (1970-05-01), Huston
patent: 3609521 (1971-09-01), Desbrandes
patent: 3808520 (1974-04-01), Runge
Gianzero, S., Lin Y--Y, "Inversion of Induction Logging Data Using the Least Squares Techniques", Paper AA, SPWLA 25th Annual Logging Symposium, Jun. 10-13, 1984.
Gianzero, S., Lin Y., Su, S., "A New High-Speed Hybrid Technique for Simulation and Inversion of Resistivity Logs", SPE 14189, Sep. 22-25, 1985.
Minerbo, G., "Inversion of Induction Logs in dipping Beds", Progress in Electromagnetics Research Symposium, Session XIX, Jul. 25-26, 1989.
Moran, J. H., Gianzero, S., Effects of Formation Anisotropy on Resistivity-Logging Measurements, Geophysics, vol. 44, No. 7, Jul. 1979, pp. 1266-1286.
Gianzero, Stanley C. "Effect of Sonde Eccentricity . . . Induction-Logging Tools, " IEEE Trans. on Geoscience Electronics, vol. GE-16, No. 4, Oct. 1978, pp. 332-339.

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