Character and distribution of Trentonian and Blackriverian reservoirs in eastern North America - implications for reservoir quality and exploration
Four different types of reservoirs occur in the Upper Ordovician carbonates of eastern North America. Type I reservoirs are the only ones that have limestone matrix porosity. They are found where localized shoals developed in a predominantly low-energy carbonate environment where the Cincinnati arch crosses the Tennessee-Kentucky border in the center of the Lexington platform. Type I reservoirs are also found in southern Illinois where depositional porosity was preserved on a part of the Galena platform. Type II are tectonic fracture-controlled reservoirs found in westernmost Virginia associated with thrusting along the east edge of the Lexington platform and in central New York along local structural features on the Trenton shelf. Type III reservoirs are related to regional dolomitization in east-central Indiana and northwestern Ohio on the Galena shelf. Type IV reservoirs developed because of localized dolomitization and solution along linear structural features in northwestern Ohio, southern Michigan, and southwestern Ontario. Type IV reservoirs are the highest quality, having individual wells that commonly produce 100,000 bbl or more of oil. Type I reservoir wells typically produce 10,000 bbl or more of oil. Type II and type III reservoirs are the lowest quality having wells that produce only a few thousand barrels of oil or a few million cubic feet of gas. Exploration for type II and type IV reservoirs is not limited by primary facies, but by tectonic framework. Exploration for type I reservoirs involves a detailed knowledge of facies and the depositional environment. Type III reservoirs require prediction of diagenetic facies.
- Research Organization:
- Indiana Geological Survey, Bloomington
- OSTI ID:
- 7053596
- Report Number(s):
- CONF-8610158-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 70:8; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
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