Abstract: Application of Iodine and Soil Gas Surface Geochemical Methods as Specifically Applied to Dolomite Chimneys
Steven A. Tedesco
The use of surface geochemical methods in the last 10 yr for petroleum exploration has become more accepted and widely used. Iodine and soil gas methods especially have been successful in delineating and finding petroleum-filled dolomite chimneys found in the Michigan and Appalachian basins and along the Cincinnati arch in central-northern Tennessee and south-central Kentucky. Specifically, the use of surface geochemistry integrated with seismic data led to the discovery of the Stoney Point field (8.4 million bbl to date) that lay undiscovered for 26 yr three to six miles east of the Albion-Scipio field in southern Michigan. More recently, surface geochemical methods have been successful in the mini-oil boom occurring along the Cincinnati arch in Tennessee and Kentucky. Numerous chimn ys have been found in Middle Ordovician rocks and typically have initial potential of 200 to 6000 bbl a day. These chimneys have been pursued by a variety of surface geochemical methods but the most consistent and successful are iodine and soil gas. The pursuit of dolomite chimneys by surface geochemical methods requires an understanding of adequate sampling density, soil conditions, integration with other methods, and limitation of the methods themselves. Surface geochemical case histories will be presented from southern Michigan, southwestern Ontario, central Tennessee, and Kentucky that specifically targeted and found dolomite chimneys.
AAPG Search and Discovery Article #90984©1994 AAPG Annual Convention, East Lansing, Michigan, September 18-20, 1994