An Electronic Analog Cross Correlator for Dip Logs

The Dip-Log Correlator is a special purpose electronic analog computer which rapidly cross correlates the three variable functions of a dip-meter well log. This cross correlator utilizes a novel derivation and application of the cross-correlation function from information theory. A prerequisite of the system is the recording of the dip-meter data on magnetic tape for computation by the cross correlator. The triple cross-correlation technique and some of the essential circuitry of the cross correlator which is in operation as a geophysical tool at the Humble Oil & Refining Company Houston Research Center are described.