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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
Volume:
Issue:
First Page:
Last Page:
Title: Structural
and Stratigraphic
Cross
Sections
: ABSTRACT
Author(s):
Article Type:
Abstract:
Dip profiles are graphs that show apparent dip as a function of distance along selected horizontal, vertical, or inclined lines on cross
sections
. Such profiles not only serve to integrate
structural
control of all kinds (surface dips, dipmeter dips, and dips derived from contour
maps
and migrated seismic
sections
) into a single numerical package, but they also provide a foundation for sophisticated geometric constructions based on the concepts of curvature trajectories and dip isogons. A curvature trajectory is a smooth line that connects points on a
cross
section where the bedding curvature has a distinctive property not shared by points on either side. (The trace of an axial plane is a familiar example.) Eight kinds of curvature trajectories (of which two relate to dip
slip faults) occur in nature. Each kind is distinguished on dip profiles by a specific, mathematically-defined special point. A dip isogon is a smooth line that connects points of equal apparent dip on those parts of a
cross
section where the bedding is curved. (The trace of a crestal plane is a familiar example.) Reliable procedures for extrapolating and interpolating curvature trajectories and dip isogons (based on the known or deduced tectonic style) can be used to establish a network of primary and secondary dip profiles--thereby insuring
structural
and stratigraphic interpretations that are statistically and
End_Page 898------------------------------
geometrically consistent with all observed data. The methods described are especially useful for resolving sparse or erratic data and predicting subtle traps and deep structures from shallow control.
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