Abstract

Recent methods of dipmeter interpretation utilizing as many as 20 dip computations per 100 feet of section (average is 7 or 8) can be used to define structural and stratigraphic anomalies. All dips are used because individual dips often provide the basis for identification of anomalies. This departs from previous methods where average dip was obtained for a zone and often led to values in excess of true structural dip. Dips are plotted by amount and direction on a vertical scale corresponding to the basic resistivity log permitting natural grouping of dip patterns. Three patterns develop in addition to random dips attributed to crossbedding: relatively constant dip amount and direction corresponds to structural dip; increasing dip with depth is associated with faults, channels, bars, and reefs; and decreasing dip with depth is associated with forest beds and unconformities.

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