Greater Sierra (oil field)
Greater Sierra is a large oil and gas field in northeastern British Columbia, Canada.
It is located east and north from the town of Fort Nelson, extending to the Alberta and Northwest Territories borders.
Drilling activity takes place largely during the winter months, when the otherwise soft muskeg and boreal forest can be crossed on winter roads. Infrastructure is funded by a combination of private and public funds.
Major projects tap in the large gas reservoirs hosted in Mississippian and Devonian limestones such as the Jean Marie Member of the Redknife Formation.
Recent projects extract gas from the Muskwa Formation and Horn River Formation. Horizontal drilling and fracturing techniques are used to extract the gas from the low permeability shales.
Due to the large extent, the field is served by several airstrips.Companies
Companies with large interests in the area include Devon Energy, Encana Corporation, Canadian Natural Resources and Petro-Canada.
