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Rock Physical-Property Measurements for the Nechako Basin Oil and Gas Region, Central British Columbia (Parts of NTS 093B, C, E, F, G, K, L)

The Mesozoic hydrocarbon-prospective Nechako (sedimentary) Basin in central British Columbia is buried by a variably thick and variably extensive, lithologically diverse assemblage of Cenozoic volcanic and sedimentary rocks. To assist in the interpretation of geophysical surveys, physical and geophysical properties (density, porosity, magnetic susceptibility and remanence, electrical resistivity and chargeability, and seismic velocity) have been measured on a sample suite covering the eleven stratigraphic units within, and stratigraphically above, the Nechako Basin. The eleven basic stratigraphic units are grouped into six major lithostratigraphic packages (combined on the basis of age, geography and lithology) for the purposes of comparing physical and geophysical properties. Each lithostratigraphic package is distinguishable on the basis of one or more physical or geophysical properties; for example, potential Cretaceous reservoir rocks (e.g., Jackass Mountain Group) have relatively high porosities (=17%), low resistivities and low seismic velocities. Generally, volcanic rocks are easily distinguished from sedimentary rocks , and the crys ta l l ine basement is distinguished from both. This dataset is available for incorporation into ongoing and future geophysical surveys of the Nechako Basin, and can be used retrospectively to assess previous interpretations. Such integrated datasets are necessary to provide a comprehensive geological and geophysical interpretation.