Abstract
Reservoirs in the Volund Field are all sandstone intrusions with wings on three sides forming the main reservoir volumes. The southern wing was the target of exploration and appraisal wells, which led to the field development. Identification of three smaller intrusions prove the southern wing is a composite intrusion, similar to outcrop analogues. Identification from core and borehole logs shows it comprises sandstone, mudstone and mudstone-rich intervals, including mudstone clast breccia. Mudstone clast breccia constitutes a significant missed pay candidate. Breccia is porous and has a sand-supported matrix, which gives it excellent reservoir quality. This may be missed pay using analysis of borehole logs. Well data, largely borehole logs, show consistently uniform sandstone porosity distribution within the intrusions, independent of depth. Significantly, at about 100m from the depth at which the wing emanates from sills, porosity has a broader spread of values. The spread of values is attributable to mudstone clast breccia and thin-bedded sandstone and mudstone. Porosity derived from borehole logs does not differentiate breccia from siltstone, but inference is possible using calibration of logs with core
| Original language | English |
|---|---|
| Pages (from-to) | 151-166 |
| Number of pages | 16 |
| Journal | Special Publication - Geological Society of London |
| Volume | 493 |
| Issue number | 1 |
| Early online date | 10 Apr 2020 |
| DOIs | |
| Publication status | Published - 2021 |
Bibliographical note
Acknowledgements Aker BP ASA and licence part- ners Lundin Norway AS are thanked for permission to pub- lish. The authors wish to thank previous development and production geoscientists and engineers who have contrib- uted to the current understanding of the Volund Field. Aker BP acknowledge the Sand Injection Research Group for their contribution to knowledge and understanding. Comments from two anonymous reviewers were valuable.Funding This research received no specific grant from any funding agency in the public, commercial, or not-for- profit sectors.