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TitleMapping the structure of the Nechako Basin using passive source seismology
AuthorCassidy, J F; Al-Khoubbi, I; Kim, H S
SourceGeoscience BC Summary of Activities 2007; Geoscience BC, Report 2008-1, 2007 p. 115-120
Year2007
Alt SeriesEarth Sciences Sector, Contribution Series 20070361
Documentserial
Lang.English
Mediapaper
ProvinceBritish Columbia
NTS92N; 92O; 93B; 93C; 93F; 93G
Lat/Long WENS-126.0000 -122.0000 54.0000 51.0000
Subjectsstructural geology; geophysics; mineral occurrences; mineral potential; hydrocarbon potential; hydrocarbons; geophysical surveys; seismology; basins; basin geometry; basin analyses; seismic velocities; velocity surveys; Nechako Basin; tomography
Illustrationslocation maps; graphs; seismic velocity profiles; diagrams; photographs
ProgramGeoscience for Mountain Pine Beetle Response, Mountain Pine Beetle
AbstractThe key objective of this project is to map the near-surface sediments, overall crustal thickness and the basin geometry of the Nechako Basin area in central British Columbia, using passive source seismology. The Nechako Basin has been the focus of limited hydrocarbon exploration since the 1930's. Twelve exploratory wells were drilled and oil stains on drill chip samples and the presence of gas in drill stem tests attests to the presence of a hydrocarbon system. Seismic data collected in the 1980's were of generally poor quality with little energy penetrating the volcanic cover. In this study, we will utilise recordings of distant earthquakes and "background noise" to map the crustal structure of the Nechako Basin. An array of seven seismic stations was deployed in September, 2006 to sample a wide area of the basin. The results of this study will complement independent active source seismic studies that are planned for the region, by providing images using waves coming "from below", and by providing constraints on the shear wave velocity. The results of this research will also complement MT studies that are currently underway, providing critical new information on porosity, fractures, and fluids. In this article we describe the methods that will be used, the progress of the data collection to date, some preliminary results, and future work.
GEOSCAN ID224445