Selected Occurrences of Overpressures
in Alaska*
By
David E. Powley1
Search and Discovery Article #60011 (2008)
Posted April 10, 2008
*Compiled from slides prepared by the
author for his numerous presentations about the subject of compartments
and pressure regimes, for which he was pioneer, advocate, and mentor.
1Deceased
October 29, 2006. Consultant after retirement from Amoco Production
Company.
uLocation map
uCook Inlet
uCopper River
uGulf of Alaska
uNorth Slope
uNavarin
uLocation map
uCook Inlet
uCopper River
uGulf of Alaska
uNorth Slope
uNavarin
uLocation map
uCook Inlet
uCopper River
uGulf of Alaska
uNorth Slope
uNavarin
uLocation map
uCook Inlet
uCopper River
uGulf of Alaska
uNorth Slope
uNavarin
|
Cook Inlet Basin
Copper River Sedimentary Province
Gulf of Alaska
North Slope Basin
Navarin Basin
![](thumbs/12.jpg)
|
Figure
12. Pressure-depth profile, Amoco Danielle No. 1, Navarin Basin,
showing top of overpressure
zone at about 8000 feet.
|
![](thumbs/13.jpg)
|
Figure
13. Pressure-depth profile, Amoco Nancy No. 1, Navarin Basin, showing
top of overpressure
zone at 7000-7300 feet.
|
![](thumbs/14.jpg)
|
Figure
14. Pressure-depth profile, Amoco George No. 1, Navarin Basin, showing
seal in interval
from approximately 7000 to 7800 feet.
|
![](thumbs/15.jpg)
|
Figure
15. Pressure-depth profile, Amoco Nicole No. 1, Navarin Basin, showing
seal in interval
from approximately 6800 to 8600 feet.
|
![](thumbs/16.jpg)
|
Figure
16. Speculative pressure-depth profile, Arco Cost well
No. 1, Navarin Basin,
from drilling mud densities from well log header.
|
![](thumbs/17.jpg)
|
Figure
17. Temperature-depth plot, Amoco Danielle No. 1, Navarin Basin, with
interpreted overall
geothermal gradient of approximately 2.1oF/100 feet.
|
![](thumbs/18.jpg)
|
Figure
18. Temperature-depth plot, Amoco Nancy No. 1, Navarin Basin, with
interpreted overall
geothermal gradient of approximately 1.9oF/100 feet.
|
![](thumbs/19.jpg)
|
Figure
19. Temperature-depth plot, Amoco Nicole No. 1, Navarin Basin, with
interpreted overall geothermal
gradient of approximately 2.0oF/100 feet.
|
![](thumbs/20.jpg)
|
Figure
20. Temperature-depth plot, Arco Cost Well No. 1, Navarin Basin, with
interpreted overall
geothermal gradient of 1.94oF/100 feet.
|
![](thumbs/21.jpg)
|
Figure
21. Temperature-depth plot, Exxon OCS-Y-0599 No. 1, Navarin Basin, with
interpreted overall
geothermal gradient of approximately 2.1oF/100 feet.
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