Project: Biostratigraphy and correlation of the Triassic Montney and Doig formations, subsurface British Columbia
The Montney and Doig formations occur in the subsurface of northeastern British Columbia, and contain large reserves of natural gas, making up 37% of the total reserves for the province. They were deposited in the Western Canada Sedimentary Basin during the Lower and Middle Triassic. The basal unit of the Doig Formation, the Doig Phosphate Zone, is an important stratigraphic marker as well as a source rock for a number of reservoirs in both the Montney and Doig formations. The age of this unit is poorly constrained, with estimates ranging from the Smithian (upper Lower Triassic) to the Ladinian (upper Middle Triassic). It is not known whether this unit is diachronous. In order to constrain the age of the Doig Phosphate Zone and to elaborate on its relationship with the underlying Montney Formation, samples will be collected from drill core in the Trutch (NTS 94G), Fort Nelson (NTS 94J) and Maxhamish (NTS 94O) map areas. These samples will then be processed for conodonts, to allow the biostratigraphic framework of the two formations to be determined. This will build on previous work funded by Geoscience B.C. which investigated the conodont biostratigraphy of subsurface sections in the Halfway River (NTS 94B), Charlie Lake (NTS 94A) and Dawson Creek (NTS 93P) map areas, as well as surface outcrop in the Halfway River and Tuchodi Lakes (NTS 94K) map areas. Understanding the biostratigraphic framework of the Montney and Doig formations will allow correlation of the hydrocarbon producing parts of these units, and will also provide insight into the evolution of the Western Canada Sedimentary Basin. These outcomes will in turn facilitate hydrocarbon exploration in B.C.