Byron Energy determined its South Marsh Island Block 58 G2 well, US Gulf of Mexico, is uneconomic with low hydrocarbon saturated sand.
G2 drilled through the Lower O Sand primary target section, however, no commercial hydrocarbons were logged with Log While Drilling (LWD) tools. LWD logs across the Lower O Sand section indicated presence of two sand bodies totaling 310 ft gross of true vertical thickness. Like the Lower O Sands observed on mudlogs from SM58 G1 drilled in 2019, the Lower O Sands in G2 had strong gas shows consisting of both light and heavy gasses while drilling. Non-commercial low saturation residual hydrocarbon-bearing sands and several wet sands were observed across the Lower O Sand section based on LWD logs.
Low-level residual hydrocarbon saturation of the Lower O Sand section is responsible for the bright seismic amplitude observed across the Lower O Sand trap and is indistinguishable from higher hydrocarbon saturations on seismic data. The results of G2 are indicative of a failed geologic seal for the fault trap at the depth of the Lower O Sands.
Current operations are plugging and abandoning the Lower O Sand section of the wellbore per government regulations. Subject to weather after plugging the well, a section of 9 5/8-in. casing will be cut and pulled from the wellbore and, after a cement kick off plug is set, the well will be sidetracked to Byron’s SM58 Brown Trout prospect. The SM58 G2 ST will be drilled to 8,152 ft MD (7,506 ft TVD) and will target the Upper O Sand in an attic position, updip from two wells that produced over 2 million bbl of oil from Upper O Sand with a water drive mechanism. The SM58 G2 ST well will gain 150 ft of structure to those wells.
Byron Energy is 100% owner and operator in South Marsh Island Block 58G2.
