Geochemistry's Contribution to Devon's Understanding of the Miss Frank Play
The Miss Frank play, produces hydrocarbons from the WDFD and overlying MISS carbonates. The first Devon well in the play was the Frank 1–33 SWD with both the WDFD and MISS cored. The Frank was immediately followed by the Johnson 1-33H (WDFD lateral) and Matthews 1-33H (MISS lateral). All three wells are less than 0.5 miles apart suggesting maturities are similar. Geochemical work on cores from the Frank cores showed that the WDFD is organic rich and oil prone but of low maturity (0.68% Ro). Furthermore, vitrinite is not the only data suggesting low maturity. Tmax values gave an avg. Ro equivalent of 0.71% while HI data yielded an avg. Ro equivalent of 0.64%. Our conclusion from the maturity data is that the WDFD at this location is not mature enough to have begun to generate or expel hydrocarbons- yet both the WDFD and MISS are productive! To investigate this we analyzed oils produced from the Johnson and the Matthews wells to establish their maturities. Data from these analyses show oil produced from the MISS and Woodford are nearly identical and oils maturities are significantly higher (∼0.98% Ro equivalent) than the local WDFD source (approximately 0.68% Ro). The difference in maturity between the WDFD source and the produced oils support the interpretation that hydrocarbons produced from the Johnson and Matthews wells have migrated from a deeper, more mature source.
AAPG Datapages/Search and Discovery Article #90221 © 2015 Mid-Continent Section, Tulsa, Oklahoma, October 4-6, 2015