Tectonic development and hydrocarbon potential offshore Troms, northern Norway
Conference
·
· Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:6161878
The study area, offshore Troms, is located from 16 to 25/sup 0/E long. and 70 to 72/sup 0/N lat. The geologic border between continental and oceanic crust is defined by a dramatic increase in water depth in the western part of the area. Thinned continental crust under the Troms basin is covered with more than a 15 km (9.3 mi) thick sedimentary sequence of Paleozoic and younger rocks. Early Permian evaporites have formed a few large diapiric structures. The main rifting phase in the Troms basin occurred during Late Jurassic-Early Cretaceous. During early Tertiary, a second rifting phase resulted in sea floor spreading west of the studied area. The north-south-oriented Ringvassoy-Loppa fault complex separates the Troms from the Hammerfest basin. All discoveries have been made in Early to Middle Jurassic sandstones. Rocks of Triassic and Permian age will be increasingly important toward the east and north. In the Troms basin, these sub-Cretaceous rocks are deeply buried, so younger reservoir zones have been drilled. Jurassic and younger rocks will be the main targets in the virgin Harstad basin. The gas has been generated from Lower Jurassic coals and shales. These, and Upper Jurassic shales with oil source potential, will probably also be the source for most hydrocarbons to be discovered in the future. The hydrocarbon potential of the relatively well-known Troms and Hammerfest basins is considered low and moderate, respectively. More promising today are Paleozoic structures on the Loppa high and structures in the Harstad basin.
- Research Organization:
- Statoil, Stavanger, Norway
- OSTI ID:
- 6161878
- Report Number(s):
- CONF-8410143-
- Conference Information:
- Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 68:9
- Country of Publication:
- United States
- Language:
- English
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