Geoscience BC Report 2012-13

Subsurface structure of the eastern Nechako Basin from coincident three-dimensional tomographic velocity and reflection data (Parts of NTS 093B, C, F, G)
by D.A.Talinga and A.J. Calvert (Simon Fraser University)

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Report Description
Extensive Tertiary basalt flows of the Chilcotin, Endako, and Ootsa Lake groups cover most of the Nechako Basin, and up to date, no discoveries have been made in this region. The inability to define prospects results from the lack of clear reflections in many areas due to the heterogeneous subsurface geology and the effects of near-surface volcanic rocks on seismic imaging. Basin analysis identified that petroleum systems in the area reside mainly within Jurassic and Cretaceous lithologies, which remain poorly imaged and in many instances unknown. Due to the complexity of the velocity model, post-stack time migrations of the 2008 Geoscience BC long-offset two-dimensional (2-D) seismic data show no dramatic improvement, with almost no coherent data below the basaltic lavas. However, significant progress in deciphering the complex geology can be made using 3-D tomographic imaging of velocity structures, when correlated with surface geology, seismic data, borehole information and laboratory velocity measurements. Tomographic velocity modelling suggests the existence of faults and velocity inversions, and a number of several buried intrusive bodies of various ages have been identified in the area.

Suggested Reference
Talinga, D.A. and Calvert, A.J. (2012): Subsurface structure of the eastern Nechako Basin from coincident three-dimensional tomographic velocity and reflection data (Parts of NTS 093B, C, F, G); Geoscience BC, Report 2012-13, 78 p.

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