Seismic and Geologic Insights from the Ultra-Deep Resistivity Data of the New Successful Bittern Field Producer

Bittern producer 29/1b-B1 was shut-in since 2019 due to very high water cut. When drilled in 2000, the reservoir upper interval was in the gas cap and not perforated. With production, oil had migrated into the gas cap and the reservoir upper interval became an infill opportunity.

29/1b-B6 was drilled in 2024 as a horizontal producer utilising Logging While Drilling (LWD) and Ultra-Deep Resistivity (UDR) to optimise reservoir landing, ensure stand-off from the moved oil-water contact, and avoid exiting the reservoir into the unstable overlying shale of the Sele Formation. Seismic data quality is poor due to a gas cloud distorting the shape and positioning of the reservoir boundaries.

29/1b-B6 found the reservoir approx. 30 ft. deeper than estimated but encountered a 40 ft. thick oil interval equivalent to prognosis, ensuring the well was a success. The 2D and 3D images from UDR indicated that an overlying injected sand was influencing the seismic interpretation of the top reservoir. UDR real-time interpretation of the injectite influenced the decisions to cure the losses encountered at its boundary and continue searching for the reservoir. 29/1b-B6 initially produced dry oil at a constrained rate of approx. 6,000 b/d.