1. Seismic Facies Analysis
Seismic Sequence Analysis
Mitchum et al., 1977b
Key Stratigraphic Units Are Broken Out
AAPG©1977reprinted with permission of the AAPG whose permission is required for further use.
Seismic Facies Analysis
Geometric Relations are Captured through ABC Mapping
Other Seismic Features are Extracted as Seismic Attributes
SLIDE 4
This slide shows a 'road map' for stratigraphic analysis
First we perform seismic sequence analysis to map sequence boundaries using reflection terminations
This subdivides the sediment fill into genetically related units – depositional sequences
Second, we do seismic facies analysis, which has two elements
We use a technique to capture geometric information
We can also extract seismic attributes, any of a variety of measures of the seismic reflections
A commonly used seismic attribute is reflection amplitude, another is reflection continuity
We combine the geometric information with the seismic attributes to predict the environments of deposition (EODs) that influenced the types of deposits (e.g., a beach where clean sands may have been deposited)
On the right, we have a portion of Line C from exercise 11a
We talked about the shelf-edge carbonate build-up "reef”
Below the seismic image is a map view for the youngest Jurassic depositional sequence
The dark blue is the location of the "reef”
To the right (landward) is a carbonate shelf
To the left (basinward) is a carbonate slope
Carbonate
Shelf
Edge
Reef
Carb.
Slope
Interpretation/Prediction
Patterns are used to Interpret EODs
Lithologies / stacking are predicted
Courtesy of ExxonMobil
L 11 – Stratigraphic Analysis