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ABSTRACT: Petroleum Exploration in Ontario: Targets and Activity

Terry R. Carter, Robert A. Trevail

There are five principal targets for oil and gas exploration in Ontario: Devonian sandstones and fractured carbonates, Silurian reefs and dolomitized zones in associated limestones, Silurian sandstones, dolomitized faults and fractures in Ordovician limestones, and Cambrian sandstones. Ordovician oil reservoirs have been the main focus of exploration interest in Ontario since the discovery of the prolific Hillman and Dover 7-5-V E pools in 1983. Production from new Ordovician pools has resulted in a tripling of annual oil production in Ontario since 1983, with Ordovician pools now accounting for over 60% of annual production compared to only 8% in 1983. Exploration for Devonian targets and Silurian sandstone targets is declining, while exploration for Cambrian sandstone r servoirs has remained steady and exploration for Silurian reefs has recently increased after a downturn in 1986. Drilling of Ordovician targets is expected to dominate exploration activity in Ontario for the near future, with a gradual

increase in Cambrian exploration as geological models for this important target are improved.

AAPG Search and Discovery Article #90998 AAPG Eastern Section Meeting, London, Ontario, Canada, September 10-12, 1990