Spreading of drill cuttings and sediment recovery of three exploration wells of different ages, SW Barents Sea, Norway

• Published in: Marine Pollution Bulletin
• Main Authors: Junttila, Juho, Dijkstra, Noortje, Sørensen, Steffen Aagaard
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2018
• Subjects: VDP::Mathematics and natural science: 400::Geosciences: 450; VDP::Matematikk og Naturvitenskap: 400::Geofag: 450; Oil/gas exploration drilling; Drill cuttings; Grain size; Marine sediments; Heavy metals; SW Barents Sea; Barents Sea; Norway
• Online Access: https://hdl.handle.net/10037/14477; https://doi.org/10.1016/j.marpolbul.2018.06.064

Accepted manuscript version, licensed CC BY-NC-ND 4.0. Published version available at https://doi.org/10.1016/j.marpolbul.2018.06.064. Five stations (≤250 m from the well heads) from three exploration wells of different ages from the SW Barents Sea were studied to investigate the spreading of drill cuttings and sediment quality. Two of the wells were drilled before the restriction of use of oil-based drilling fluids (1993). Elevated concentrations of Ba were found in sediments near all the wells with the highest concentrations at ≤60 m from the well head. The thickness of drill cutting layers was between > 20 cm (well head) and 2 cm (250 m from the well head). The sediment quality varied from very bad (oldest well) to background (normal) (newer wells). Regulations led to better sediment quality. Metal concentrations from the oldest well suggested that the top 4 cm of the core represents sediment recovery. However, Ba concentrations of the top sediment layer at all the stations of the three wells indicate no physical recovery