1. Seismic Stratigraphy – identifying the seismic sequence
Objectives for the Day
Seismic Stratigraphy – identifying the seismic sequence
Describing the seismic sequence
Basic seismic sequence identification exercise
Tom Wilson, Department of Geology and Geography

2. Seismic Stratigraphy
Seismic stratigraphy allows us to gain more accurate insights into sediment succession.
Facies association rather than lithostratigraphy forms the basic architectural element. In the fluvial system we are interpreting at Stratton, the reflection events and the entire Frio interval represents a collection depositional environments including not only the channel sands (B48, C36, F11, etc.) but levee, overbank, flood sand sheets, …
These intervals are simultaneously deposited and the reflection events do not represent lithologically distinct sedimentary packages.
These genetically related packages of sediment are often separated by unconformities of one sort or another, and the identification of these unconformities in the seismic section forms the basis of seismic stratigraphy.

3. Sequence identification is based on Boundary Relationships
Mitchum et al. (1976)

4. .. and internal configuration: parallel to sub parallel and prograding clinoforms

5. Seismic Sequence Characterizationb. c. d.

6. Sequence mapping

7. Identifying Seismic Sequences
Mitchum et al. (1976)

8. Chronostratigraphic Representations
Generalized stratigraphic section of a sequence
The depositional sequence - Genetically related strata bounded above and below by unconformities or correlative conformaties
Generalized chronostratigraphic section of a sequence
Mitchum et al. (1976)

9. Stratigraphic Sequences / Log Correlation
Mitchum et al. (1976)

10. Sequence Deposition During Sea Level Rise
Shoreline position during sea level rise is tied to terrigenous influx
Vail et al. (1976)

11. Gradual vs Rapid Fall
Mitchum and Vail . (1976)

13. Relative Sea Level Change
Sea level variations appear throughout the range of temporal scales
Vail et al. (1976)

14. Island Platform, Deep Water, Southern Bahamas

15. Baltimore Canyon, East Coast, US

16. National Petroleum Reserve, Alaska

17. Central Atlantic Shelf, near the Baltimore Canyon

18. to do's
to be updated …