1. Vurdering av seismisk AVO-respons i slumpområder
Classification: Statoil internal Status: Draft
I5B-segmentet
Vurdering av seismisk AVO-respons i slumpområder

2. Top Cook depth map.
Seismic profiles indicated as red lines
L2881

3. Increasing amplitudes with offset indicates oilfilled reservoir
Line 2881, I4 segment
1999 full stack
mid
near
far
Increasing amplitudes with offset indicates oilfilled reservoir
Top Brent
Top Cook
Top Statfjord
Yellow/red represents a decrease in acoustic impedance
Base Crt.

4. Randomline, I4 segment 1999 full stack mid far near
Note the opposite avo response due to the pressure effect (blue arrow) and oilfilled reservoir (red arrow)
Top Brent
Top Cook
Top Statfjord
Yellow/red represents a decrease in acoustic impedance
Base Crt.

5. Top Cook depth map. Seismic profile indicated as red line L2995
Top Brent
Top Cook
Top Statfjord
Yellow/red represents a decrease in acoustic impedance
Base Crt.

6. Line 2995, I5B segment (prospect)
1985
1996
1996
1999
Top Brent
Top Cook
Top Statfjord
Yellow/red represents a decrease in acoustic impedance
Base Crt.

7. Line 2995, I5B segment (prospect), offset stacks
1985, full stack
mid
near
far
Top Brent
Top Cook
Top Statfjord
Yellow/red represents a decrease in acoustic impedance
Base Crt.

8. Classification: Statoil internal Status: Draft
Cook-2 and Cook-3
How much does geological setting affect seismic response?
Model the seismic response in a three-layer setting with varying thicknesses and fluids

9. How much does geological setting affect seismic response?
Cook-2 and Cook-3 are very different reservoirs, both in a geological sense and from a production point of view
Cook-2 is meters thick, while Cook-3 is meters thick, both thinning towards north
In the east the formation is eroded by the BCU.
We know that we can observe pressure build-up in Cook on 4D seismic
We want to predict how water flooding will appear in the 4D seismic, but our model has probably been to coarse, mixing Cook-2 and Cook-3 properties

10. How much does geological setting affect seismic response?
Cook-2
Cook-3
BCU
Drake
Shetland
Interfaces
Uneroded: Drake->Cook-3
“Uneroded”: Shetland->Cook-3
Eroded: Shetland->Cook-3
Eroded: Shetland->Cook-2
Fluids
Brine, oil, gas
Thickness variations
Cook-2: 0-60 meters
Cook-3: 0-50 meters
Task: Determine the seismic response in a 3-layer model with varying thicknesses and fluids
Get parameters from geomodel!