Synthetic Deviation

This interpretation method, SYNDEV,  treats dips as if they were deviations (Berg, 1998).  The resulting plots are cumulative in nature and reflect overall changes in dip and azimuth. 

The displacement plot on the bottom left is the total displacement of the imaginary borehole at each depth.  This plot is analogous to the cumulative dip plot of Hurley, 1994.

The azimuth difference plot in the bottom center reflects changes in azimuth of the borehole.  

The map on the bottom right shows changes in azimuth of the imaginary borehole.  It is analogous to the commonly used dip-azimuth-vector plot.

Try different tilts and different amounts of scatter on the two models.  Since the plots are cumulative, they are not very sensitive to scatter.   They are also not very sensitive to smoothing.  Changing the structural tilt changes the shape of the curves, but generally the anomalies are still visible on one plot or another.

SYNDEV is useful in spotting subtle features and in interpreting old dip logs with large amounts of scatter.  This method has the advantage of spotting anomalies before rotation or when the tilt angles are unknown.