Top Mesozoic unconformity subcrop map, Cook Inlet basin, Alaska
Dates
Publication Date
2016
Start Date
2010
End Date
2016
File Modification Date
2016-07-18 18:28:00
Citation
Gregersen, L.S., and Shellenbaum, D.P., 2016, Top Mesozoic unconformity subcrop map, Cook Inlet basin, Alaska: Alaska Division of Geological & Geophysical Surveys, http://dx.doi.org/10.14509/29658.
Summary
This map shows the subcrop pattern of the Mesozoic rock units present at the top Mesozoic unconformity (also commonly referred to as the base Tertiary unconformity) in Cook Inlet basin, Alaska. The subcrop is projected onto the top Mesozoic unconformity depth surface of Cook Inlet basin, Alaska, published by Shellenbaum and others (2010). Publicly available geologic and geophysical data from multiple sources were collected, interpreted, and integrated into the subcrop map. Formation picks at the top Mesozoic unconformity were determined for 109 wells. Mesozoic horizons from two regional marine two-dimensional (2-D) seismic datasets (approximately 3,300 miles) were interpreted. Eight map units were established for the Mesozoic subcrop [...]
Summary
This map shows the subcrop pattern of the Mesozoic rock units present at the top Mesozoic unconformity (also commonly referred to as the base Tertiary unconformity) in Cook Inlet basin, Alaska. The subcrop is projected onto the top Mesozoic unconformity depth surface of Cook Inlet basin, Alaska, published by Shellenbaum and others (2010). Publicly available geologic and geophysical data from multiple sources were collected, interpreted, and integrated into the subcrop map. Formation picks at the top Mesozoic unconformity were determined for 109 wells. Mesozoic horizons from two regional marine two-dimensional (2-D) seismic datasets (approximately 3,300 miles) were interpreted. Eight map units were established for the Mesozoic subcrop map: Kaguyak-Matanuska Formations, undivided; Naknek Formation; Chinitna Formation-Tuxedni Group, undivided; Talkeetna Formation; Talkeetna-Border Ranges ultramafic and mafic complex (BRUMC), undivided; Pogibshi-Port Graham formations, undivided; plutonic rocks, undivided; and metamorphic rocks, undivided. This map was prepared as part of a multi-year effort by the Alaska Department of Natural Resources.
Oil in Cook Inlet basin is primarily sourced out of the Middle Jurassic Tuxedni Group, thus the subcrop trends of the Middle Jurassic oil source rock and other potential Mesozoic-age reservoirs are an important consideration in oil exploration in the inlet. This map was prepared as part of a multi-year effort by the Alaska Department of Natural Resources to provide the public with the most accurate information possible on the geologic framework of this economically important area.
