PBS-SEPM 2025 November Luncheon - Tiffany Stephens

"History and Highlights of the “Cherokee” Shale play in Ellis & Roger Mills Counties, Oklahoma" - Tiffany Stephens, Exploration Manager, Duncan Oil Properties, Inc.
 
Abstract
Since the start of Mewbourne’s shale play, Duncan has researched vertical cuttings, core data, production data from the major operators, mudlogs, and other geological data.  They have mapped Ellis County with different techniques, performed Delta Log R (Passey Method) calculations, and also looked at pressure and maturity data.  While this play is still being actively drilled and evaluated, Duncan will share the history of the play and what they’ve learned so far in Ellis and Roger Mills Counties, OK.  The tectonic, depositional, and stratigraphic settings will be briefly discussed along with some of the unique mineralogy present in Ellis County.  They will also share the results of their two “Cherokee” shale horizontals drilled under Cleveland/Marmaton wells in Ellis County, and their drilling issues and successes.
 
Bio
Mrs. Stephens has a J.D. in Law as well as her B.S. and M.S. in Geology from the University of Oklahoma.  She was certified with the Oklahoma Bar Association and has over 19 years of experience in the oil and gas industry.  Work experience includes research with the Sam Noble Museum of Natural History; management of the Oklahoma lease process and title work for Vernon L. Smith and Associates; and geological and legal work in the energy industry for Pioneer Natural Resources, Inc, Chaparral Energy, L.L.C., Arnold Oil Properties, L.L.C., Black Crown Energy, L.L.C., and Duncan Oil Properties, Inc., where she is currently the Exploration Manager.  Her work has focused primarily in the Anadarko Basin and Shelf.  She has worked the Cana Woodford, STACK, Cleveland, Marmaton, Red Fork, Granite Wash, Hunton, and the new “Cherokee” shale play, to name a few.