Stacking Patterns

 Well Logs: stacking patterns of clastic parasequences

After Van Wagoner et al., 1990

progradational parasequence sets
As in figure below each successively younger parasequence is deposited farther basinward when the rate of deposition is greater than the rate of accommodation (regression).



retrogradational parasequence sets
In figure below each successively younger parasequence is deposited farther landward in backstepping pattern when the rate of deposition is less than the rate of accommodation and a transgression of sea occurs.

 

aggradational parasequence sets
Note that below each successively younger parasequence is deposited above one another with no significant lateral shifts when the rate of accommodation approximates the rate of deposition.




progradational parasequence sets of the lowstand systems tract

In figure below stacking patterns and trajectories of progressively younger parasequences 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.



 

Note the proximal distal fan toe of slope, and mid fan and  mid slope channels

 

 

 

retrogradational parasequence sets of the transgressive systems tract
stacking patterns and trajectories of progressively younger parasequences which are deposited farther landward when the rate of deposition is less than the rate of accommodation (regression) during a rise 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.

aggradational progradational parasequence sets of the highstand systems tract
stacking patterns and trajectories of progressively younger parasequences which are deposited farther seaward when the rate of deposition exceeds the rate of accommodation (progradation) during a still stand 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.

 

Monday, February 25, 2013
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