Some of the methods used at the present time for the determination of the angle and of the azimuth of the dip of the formations traversed by a bore hole are based on the correlations between three curves recording certain electrical characteristics of the formations, such as SP or resistivity, along the wall of the bore hole in three equally spaced azimuths. With the conventional equipment used for the application of these methods, the measurements are made over separate intervals of depth.

In the present paper, a new improved instrument called microlog continuous dipmeter is described, wherein the three curves used for the determination of the dip are obtained with three microlog devices, and wherein these three dipmeter curves,--and furthermore the orientation of the instrument and the inclination of the bore hole--are simultaneously and continuously recorded.

It is shown that, with the help of this instrument, more numerous dip determinations can be made in a given well, with a higher accuracy and a greater recording speed.

The paper is illustrated with field examples.

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