Bell Creek Test Site - Initial Analysis of Extended PNL Campaign Data Completed
Pulsed-neutron logging (PNL) provides data important in understanding the subsurface environment during CO2 injection. PNLs have been acquired with Schlumbergers Reservoir Saturation Tool in the Bell Creek oil field for the purposes of 1) providing baseline characterization data (lithology/mineralogy, porosity, and water and oil saturations) for the Muddy Formation reservoir interval and overlying strata; 2) monitoring for time-lapse changes in fluid saturations (water, oil, and CO2) both within the reservoir and in the overlying strata; and 3) providing an evaluation of the utility of PNLs as a commercially viable monitoring, verification, and accounting technology. PNL acquisition began in June 2013 in Bell Creek Phases 1 and 2. The PNL campaign was extended into Bell Creek Phases 3 and 4 in October 2015 to 1) monitor CO2 saturation response in two geologically compartmentalized regions of the field (not hydraulically linked to existing injection in Phases 1 and 2) in which CO2 injection was beginning and 2) expand monitoring of overlying zones to additional development areas. The extended PNL campaign also included the acquisition of 13 repeat/monitor PNLs in Bell Creek Phase 1 in continuation of monitoring activities and assessment of near-wellbore saturation response to water-alternating-gas injection.View/Download Document