Integration of 4D Monitor to Enhance Reservoir Management: A Case Study of Egina Field

Abstract The Egina field is one of the most recent deepwater assets in Nigeria. The Field was discovered in 2003 and production commenced in December 2018. The production plateau of 203 KBOPD was reached in May 2019. Egina field, which is TotalEnergies’ second operated deepwater asset in Nigeria, located in water depths of about 1500m, is composed of highly faulted turbiditic reservoir units. It lies within the transition zone between the extensional and compressional regime of the Nigerian deep-water basin. This paper presents the integration of time lapse (4D) seismic monitoring to enhance reservoir management of Egina field, with a focus on the application and challenges of the seismic monitoring. Egina 4D M1 Ocean bottom Nodes (OBN) seismic data, which was acquired in October 2021, provided valuable insights into the reservoir dynamics including injected & aquifer water movement, pressure evolution in the vicinity of water injectors and depletion patterns around producers. The 4D seismic data has been used as a static model validation tool, critical input for history match process in several reservoir units, support for well intervention program, optimization of well placement and completion, and the evaluation of infill drilling opportunities. Specifically, we share the successful application of 4D seismic for the identification and screening of well intervention candidates, identification of focus intervals for stimulation (Pseudo-PLT) and the result of the recent 4D guided drilling campaign. Furthermore, we also present the challenges and limitations associated with the applicability of the data.