Dip Resolver, Analog with well log input

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Item Dip Resolver, Analog with well log input
Item code
Description Interpret borehole dipmeter results
Location Houston Geoscience Center
Serial number
Taxonomy GSH546

Humble Oil’s version of the Carter device. It was used to determine dips relative to the borehole and has three scales whose indices were set according to the radii of the points measured and posted on the paper log. Three other scales had indices for the vertical displacements of those points. The compass rose was set according to the indexed direction of Arm No. 1. Those index settings were then used to position the vertical rods relative to each other and relative to the compass rose north. Then the metal plate was positioned to rest on the rods. Once that was done, the magnitude and direction of down-dip could be read from graduated scales: dip magnitude was graduated by single degrees and dip direction by five degrees. Dips up to 60 degrees could be computed. Borehole inclination and its direction could be obtained by special nomograms which required five representative distances measured from the proper traces on the paper log. Using pairs of distances, one could calculate angles from the nomogram of: the direction of Arm No. 1, the direction of hole inclination, and the magnitude of hole inclination. A polar chart could then be used to convert dip relative to the borehole to dip relative to true horizontal