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The general principles of determining, from a bore-hole, the dip and strike of subsurface formations by a continuous profiling method are discussed. The profiling type dipmeter is based on the principle that the softer formations erode to a greater extent than the hard formations during the drilling process. A part of a dipmeter-survey record is shown to illustrate the computation of dip by measurements taken directly from the log. The device, which makes a continuous measurement of the logging tool's orientation with respect to compass North as well as the amount and direction of the bore-hole inclination, is demonstrated. A true dip computer is discussed briefly.
Results of dipmeter surveys on drilling wells are illustrated and discussed. The results obtained with the profiling type dipmeter have been proved valuable in the study of subsurface conditions.
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