Integrated Interpretation and First Arrival Tomography of Reflection Surveys in Nechako Basin

Key Researcher(s):  A. J. Calvert

Project ID:  2007-005

Key Research Organization(s):  Simon Fraser University

Project Location:  Cariboo

Focus Area:  Energy-Oil and Gas

Summary



The Nechako Basin, which is located in the interior plateau of British Columbia between the Coast Mountains and the Rocky Mountains, has seen very little exploration for hydrocarbons, in marked contrast to the western Canadian sedimentary basin. The structure and hydrocarbon potential of the basin is poorly understood. Project area

As part of a previous Geoscience BC project at Simon Fraser University, 1650 km of seismic data acquired in the Nechako basin by Canadian Hunter have been interpreted and integrated with magnetic and gravity data. In addition, shallow (<1000 m depth) P wave velocity models have been derived along the linear survey profiles using tomographic inversion of first arrival travel times.

This new project extends the current work to the new seismic survey that will be acquired by Geoscience BC in Nechako basin in 2008. The new survey will provide a regional context to the older, more focussed seismic surveys, including a better defined relation between the sedimentary sub-basins and the evolution of the underlying igneous crust, which should be better imaged. The longer recording spreads of the 2008 survey, which will have offsets up to 14.4 km, should also allow discrimination of sedimentary lithologies from igneous rocks to depths of approximately 2 km, complementing the interpretation of the reflection images. With integration of the 1980s and 2008 seismic data with existing gravity/magnetic data, the along-strike extent of the prospective NNW-trending Cretaceous rocks exposed in the Nazko river valley, and drilled by Canadian Hunter, should be better defined.

As part of a previous Geoscience BC project at Simon Fraser University, 1650 km of seismic data acquired in the Nechako basin by Canadian Hunter have been interpreted and integrated with magnetic and gravity data. In addition, shallow (<1000 m depth) P wave velocity models have been derived along the linear survey profiles using tomographic inversion of first arrival travel times.

 

Deliverables