Date of Award
4-1991
Degree Name
Master of Science
Department
Geological and Environmental Sciences
First Advisor
Dr. William Harrison III
Second Advisor
Dr. David Barnes
Third Advisor
Dr. John Grace
Access Setting
Masters Thesis-Open Access
Abstract
The prolific Antrim Formation natural gas reservoir in Otsego County, Michigan, has been examined using core descriptions, X-ray diffraction, petrographic, and geochemical analyses. New stratigraphy nomenclature is proposed for the Antrim and Ellsworth Shales. The Antrim Shale contains two distinctive lithofacies: (1) a fractured, non-bioturbated, silica-rich, organicrich black shale lithofacies; and (2) sparsely fractured, bioturbated, carbonaterich, organic-poor gray-green shale. Gas production comes from the Black shale facies.
Rock-Eval analysis demonstrates that the organic matter is a mixture of types I and II material. Low Tmax (435°C) and vitrinite reflectance (0.41-0.46%) values indicate a submature thermal maturation level. Del 13 carbon isotope analysis of produced gas samples demonstrates that the thermal maturation of the gas and the Antrim source beds are correlative. High SI values (8.25 milligrams free oil /gram of rock) and physical observations of oil staining demonstrate that Antrim oil has been generated.
Recommended Citation
Dellapenna, Timothy M., "Sedimentological, Structural, and Organic Geochemical Controls on Natural Gas Occurrence in the Antrim Formation in Otsego County, Michigan" (1991). Masters Theses. 975.
https://scholarworks.wmich.edu/masters_theses/975