An illusion is created in attempting to portray steeply dipping seismic data by standardized geometric procedures. The offset seismic profile, although resembling the vertical geologic cross-section in appearance, may have an inherent tilt which is a function of cross-dip. Unless this tilt is accounted for during the solution of critical structural problems, serious errors can enter into the interpretation of the seismic data. Descriptive geometry procedures are applied to establish the tilt and determine its effects on fault traces, structural axes, and well ties.

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