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AAPG Bulletin, V. 84, No. 3 (March 2000), P. 399-422.
Sequence Stratigraphy of the Aux Vases Sandstone: A Major Oil
Producer in the Illinois Basin1Hannes E. Leetaru2
©Copyright 2000. The American Association of Petroleum Geologists. All rights
1Manuscript received September 30, 1998; revised manuscript received June 28,
1999; final acceptance September 3, 1999.
2Illinois State Geological Survey, Champaign, Illinois 61820-6964; e-mail: [email protected]
I thank many of my colleagues at the Illinois State Geological Survey for their
discussions and reviews of the manuscript. I also thank my advisor, John Mann, for his
help. The paper is based on my Ph.D. dissertation at the University of Illinois. I
appreciate the time taken by the two AAPG reviewers, Robert Cluff and an anonymous
reviewer. We acknowledge the support of this research by Landmark Graphics via the
Landmark University Grant Program. Publication authorized by the chief, Illinois State
The Aux Vases Sandstone (Mississippian) has contributed between 10 and 25% of all the
oil produced in Illinois. The Aux Vases is not only an important oil reservoir but is also
an important source of groundwater, quarrying stone, and fluorspar. Using sequence
stratigraphy, a more accurate stratigraphic interpretation of this economically important
formation can be discerned and thereby enable more effective exploration for the resources
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