Eastern Section Meeting

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An Integrated Geochemical Model Using Sulfur and Organic Carbon for the Late Devonian Antrim Shale, Michigan Basin, USA

Abstract

The late Devonian Antrim Shale, Michigan Basin, United States has been a main producing unconventional shale reservoir in the Michigan Basin for the past 35 years. More than 3.4 trillion cubic feet of natural gas have been produced although production is now declining. In order to quantify distribution of hydrocarbons and source rock potential for continued production in the Antrim Shale, additional techniques must be utilized. Antrim Shale deposits containing depleted levels of 34S may be correlated to areas with increased abundance of organic carbon and total sulfur. The 34S in pyrite, organic carbon and total sulfur will be assessed in two wells from the central basin and the northern margin, in an attempt to reconstruct depositional environments and diagenetic alterations. Organic carbon (TOC) vs. sulfur scatter-plots will be created in order to establish non-marine vs. marine depositional environments within the Michigan Basin in comparison to regional depocenters such as the Appalachian Basin, Williston Basin, and Illinois Basin. Increased levels of sulfur and TOC may classify the amount of restriction the Michigan Basin experienced during the Late Devonian. Mapping organic rich, isotopically depleted 34S sedimentary layers within the Michigan Basin may provide useful data of Devonian sedimentary environments and petroleum source rocks. This study will attempt to correlate relationships across the Michigan Basin in a sequence stratigraphic model that outlines depositional environment redox conditions, and source rock potential.