Unraveling Intra-Zechstein Structuration and Understanding the Relationship with Geo- Drilling Hazards: By means of detailed seismic mapping in the Dutch Eastern Offshore (2019)
MSc thesis by former intern Ward Teertstra.
In this study 154 wells that observed thickened stringers (i.e. > 60-meter of ZEZ3A), were investigated for Zechstein geodrilling events. Wells with thickened stringers showed significantly lower percentages of kicks in the stringer, compared to kicks encountered in “normal thickness” stringers as described a previous study done by P. Schilder (2019, EBN internship). By combining the results of seismic mapping and well analyses, a new geological explanation for the thickened stringers is proposed. Planning and drilling new well trajectories might benefit from the improved understanding of stringer thickness variability based on this research.