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

MARINE POLLUTION BULLETIN

卷:135

Article

Junttila, Juho¹  Dijkstra, Noortje¹  Aagaard-Sorensen, Steffen¹ 

[1] UiT Arctic Univ Norway Tromso, Dept Geosci, Postboks 6050 Langnes, N-9037 Tromso, Norway

关键词: Oil/gas exploration drilling;    Drill cuttings;    Grain size;    Marine sediments;    Heavy metals;    SW Barents Sea;   

DOI  :  10.1016/j.marpolbul.2018.06.064

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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