Well
Logs: Stacking Patterns of Clastic Parasequences
(Van Wagoner et al., 1990)
Progradational
Parasequence Sets
Successively younger parasequences are deposited farther basinward
when the rate of deposition is greater than the rate of accommodation
(regression).
Retrogradational
Parasequence Sets
Successively younger parasequences are deposited farther landward
in backstepping pattern when the rate of deposition is less than
the rate of accommodation (transgression).
Aggradational
Parasequence Sets
Successively younger parasequences are deposited above one
another with no significant lateral shifts when the rate of accommodation
approximates the rate of deposition.
Analysis Pitfalls
Progradational
Parasequence Sets of the Lowstand System Tract
Stacking patterns and trajectories of progressively younger
parasequences which are deposited farther basinward when
the rate of deposition is greater than the rate of accommodation
(regression) during a fall in base level. Click on image below
to access a larger version of this diagram and view grain size
distribution and clastic geometries within deepwater fans.
