Breidablikk Field: Reducing Reservoir Uncertainties During Field Development by Improving Seismic Data Quality

The Breidablikk field, located in the North Sea, was initially considered as having insufficient resources for a viable economic development strategy. The field’s complex reservoir geometry presented significant challenges in subsurface characterisation. This paper illustrates how continuous improvement in data quality enabled a comprehensive understanding of the subsurface, leading to an effective development strategy. We implemented a structured approach in three distinct stages, contributing to enhanced seismic data quality. In the first stage, we established an interpretation strategy for the Heimdal reservoir and injectite sands using regional well data and insights from surrounding fields. The focus was on analysing variations in acoustic rock properties within the sand injectites, which influence changes in seismic responses. Then the second stage consisted of maximising the value of all available geophysical information; to do so, multi-client seismic data was reprocessed and further preconditioned for quantitative interpretation. Finally, in the third stage, a dense 3D Ocean Bottom Node (OBN) survey was acquired in 2020; all available processing technologies like Time-Lag FWI and Up-Down Deconvolution were used for structural imaging. The three-step approach enhanced confidence in the seismic interpretation of the reservoir and resulted in refined drilling targets.