Onshore
Gillis, Robert J.1, Rocky R.
Reifenstuhl1, Paul L. Decker2, Andrea L. Strauch1,
Kenneth L. Helmold2 (1) Alaska Division of Geological &
Geophysical Surveys, Fairbanks, AK (2) Alaska Division of Oil & Gas,
Anchorage, AK
In 2005 the State of
Results of 2006 field work in the Port
Moller area show potential reservoir rocks occur within the Late Cretaceous
Chignik and early Tertiary Stepovak Formations. Reservoir quality varies from
moderate to good with porosities of 14.16 to 23.06 percent and Klinkenberg
permeabilities of 1.16 to 3.33 md. Capillary pressure data for the Early
Cretaceous Staniukovich Formation suggest it can provide a seal for gas columns
ranging from 200 to 1,000 ft in height. Additional seal capacity and source
rock data are pending for the Miocene Bear Lake Formation, but previous results
identify the early Mesozoic Kamishak and Kialavgvik Formations as potential
source rocks. Geologic mapping reveals dominantly NE and NW structural trends
characterized by large folds and high-angle faults with strike-slip and normal
separation. Megascopic shear sense indicators that include low-angle striations
on fault surfaces reflect predominantly strike-slip motion.
The data suggest all the components of a
petroleum system are present in the Port Moller area, but further work is
required to determine the existence and extent of economically viable
resources. These results may provide insights into the offshore petroleum
system of
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California