Hydrocarbon Resource Assessment of the Trenton-Black River Hydrothermal Dolomite Play in Ontario


The role of the Southern Ontario Hydrocarbon Project is to create a modern synthesis of fully accessible digital forms of data fundamental to oil and gas exploration, resulting in consistent stratigraphic correlation and an updated assessment of energy potential. The last full assessment of Ontario’s hydrocarbon resources was completed in the early 1980’s: since that time over 3000 petroleum wells have been completed and new targets identified. Understanding the stratigraphic framework of the Paleozoic succession is essential for promoting the continued development of these resources. In addition, underground storage of gas in depleted reservoirs is critical to Ontario’s economy each year. Digitized, easily-manipulated and publicly-accessible data in GISbased formats will initiate new evaluation of various targets areas and stratigraphic horizons, leading to renewed exploration and major economic impact.

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An Updated Guide to the Subsurface Paleozoic Stratigraphy of Southern Ontario - 2006 (OFR-6191)

Now updated in hardcopy format:
The Subsurface Paleozoic Stratigraphy of Southern Ontario - Ontario Geological Survey Special Volume 7


In 1967 the Ontario Department of Energy and Resources Management published Paper 67-2, “Guide to the Subsurface Palaeozoic Stratigraphy of Southern Ontario” (Beards 1967). The guide consisted of 2 key elements: regional geological structural cross-sections based on gamma-ray and neutron logs and lithological characteristics of subsurface Paleozoic bedrock strata encountered in a selection of deep petroleum wells; and description of standardized criteria for identification of Paleozoic geological formations in drill cuttings and gamma-ray logs. The publication was intended to be a practical guide for the working petroleum geologist and was widely adopted and used for this purpose. However, it was not adopted by geologists in other disciplines, such as aggregates and environmental studies, who rely on more traditional field-based studies of surface exposures of bedrock in outcrops and quarries, and core from shallow diamond-drill holes. This has led, in some cases, to development and use of conflicting stratigraphic definitions and terminology, in particular for Middle and Upper Ordovician strata. In the almost 40 years since Paper 67-2 was published, over 5000 petroleum wells have been drilled in Ontario, including 450 to Precambrian basement and at least a dozen continuously cored holes. Geophysical logging technology has improved, new depositional models and methods of interpretation (e.g., sequence stratigraphy) have been developed, and revisions made to stratigraphic nomenclature. In addition, digitization of subsurface data has enhanced their management and analysis.

To purchase this publication (OFR-6191) please contact:

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