1. General review seismic stratigraphy exercises
Objectives for the Day
General review seismic stratigraphy exercises
Discussion of problems 3 and 4
Begin working with Kingdom
Tom Wilson, Department of Geology and Geography
Tom Wilson, Department of Geology and Geography

2. Problem 3 Problems 3 and 4 from last week’s handout
Tom Wilson, Department of Geology and Geography

3. Problem 4
Tom Wilson, Department of Geology and Geography

4. Island Platform, Deep Water, Southern Bahamas
Platform to the left. Appears simple with wedge of sediments dipping down to the right which is in turn onlapped by flatter lying sediments 1)
Tom Wilson, Department of Geology and Geography

5. some comments on the preceding section
In the preceding section, the platform lies to the left. The prominent seismic sequence to the right appears as a simple wedge of sediments dipping down to the right which is in turn onlapped by flatter lying sediments.
Closer inspection reveals several distinct intervals of onlap belonging to at least three different sequences.
The section reveals an earlier prograding sequence that was extensively eroded and itself followed by additional onlap against the escarpment to the left.
Subtle downlap and onlap mark locations of smaller sequences within the latest package that extends to the water bottom.
The pattern suggests presence of an earlier high stand system followed by significant sea level drop and then by gradual and relatively steady sea level rise
Tom Wilson, Department of Geology and Geography

6. Prograding clinoforms/oblique
Baltimore Canyon, East Coast, US
Prograding clinoforms/oblique
Erosional Truncation
A combination of prograding clinoforms followed by sealevel drop and coastal onlap (3 and above) overlie a thick sequence characterized by predominantly parallel reflection events with some local onlap (1) above a deeper erosional inconformity
Tom Wilson, Department of Geology and Geography

7. National Petroleum Reserve, Alaska
Sigmoid clinoforms
Tom Wilson, Department of Geology and Geography

8. National Petroleum Reserve, Alaska
Sigmoid clinoforms
Some questions to contemplate:
What was the bathymetric relief between the top and base of the prograding wedge?
Was the wedge building upward, outward, or a combination of the two?
What caused the reflectors on the left (4) to become hump shaped?
Tom Wilson, Department of Geology and Geography

9. Prograding clastic wedge
Central Atlantic Shelf, near the Baltimore Canyon
Prograding clastic wedge
The reflectors to the right of 1) build both out and up. The internal configuration is oblique (left) to sigmoid (near 1) and then oblique again. The environment is prograding shelf margin.
Tom Wilson, Department of Geology and Geography

10. Let’s see how things stand with the Kingdom exercise.
Tom Wilson, Department of Geology and Geography

11. Today Hand in the initial seismic sequence interpretations
Be prepared to ask final questions on problems 3 and 4 next Monday.
Problems 3 and 4 due next Wednesday
Be prepared to show completed fault interpretation exercise or equivalent progress on your 3D seismic interpretations next Monday.
Tom Wilson, Department of Geology and Geography
Tom Wilson, Department of Geology and Geography