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Dexter Field, Mississippi: An Analysis of the Tuscaloosa Marine Shale

Zachary B. Lukaseski
Mississippi Mineral Resources Institute (MMRI), University of Mississippi

The purpose of this study is to investigate the potential for production of oil and gas from the Tuscaloosa Marine Shale (TMS) in the Dexter Field, Walthall County, Mississippi using horizontal drilling and hydraulic fracturing. The investigation of the Dexter Field is based on analysis and interpretation of logs from previously drilled wells in archives at the Mississippi Mineral Resources Institute (MMRI) at the University of Mississippi. The Dexter Field is located within the Mississippi Interior Salt Basin and has been drilled for over 60 years targeting production from the Lower Tuscaloosa Sands, a part of the Tuscaloosa Formation. The current interest in the TMS, which lies above the lower Tuscaloosa sands, stems from a report by the Basin Research Institute (BRI) stating the TMS has potential to produce 7 billion barrels of oil. This research interpreted 147 well logs within the Dexter field focusing on the Tuscaloosa units (Upper, Marine Shale, and Lower), with emphasis on the higher resistivity sections (> 6 ohms*m) of the TMS. An isopach map of the high resistivity zones within the Dexter field shows that the thickest zones trend east to west across the field, with the thickest section ranging from 24 - 26 feet.

AAPG Search and Discovery Article #90182©2013 AAPG/SEG Student Expo, Houston, Texas, September 16-17, 2013