Abstract
This paper describes the mathematics used in an algorithm for the automatic computation of dips derived from the dipmeter log. The key idea of the paper is the planarity of bedding surfaces crossing the borehole. Planarity imposes a constraint on the crosscorrelation of the four dipmeter traces which is used to good advantage in computing a correlation surface. This surface is searched locally for a maximum in such a manner that eliminates a search angle restriction which occurs in older programs. The location of the maximum correlation coefficient determines the dip and azimuth of a bedding plane which is displayed in a tadpole plot. The tadpole plot results of this algorithm are compared with several Schlumberger algorithms.
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