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Drill Cuttings in the Barents Sea and their Environmental Footprint. A Visual Assessment of the Seabed Condition



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Bachelor Thesis from the year 2016 in the subject Environmental Sciences, grade: 1,0, University of Kassel (Akvaplan-niva, Norway), language: English, abstract: The centre of interest for this Bachelor thesis is the visual assessment of drill cuttings at the sea floor around oil and gas drilling locations in the Barents Sea. The purpose is to detect the spatial extent of impacts on the sediments. In order to validate the reliability of visual assessments, the method is compared to the results of benthic macrofaunal analysis, which are an approved indicator of sea-floor assessments. The results of the visual assessment are also compared with Underwater Hyper-spectral Imaging (UHI), which is a tool under development for sea-floor assessments. In September 2015 six drilling sites of different age categories were investigated: recent (less than 8 weeks, post-drill), average (3 to 15 years) and old (more than 20 years). Video transects were carried out, and grab and core samples were obtained by a Remotely Operated underwater Vehicle (ROV). For sampling the UHI transects a push-broom scanner was attached to the ROV. The visual inspection of the video transects was recorded in a log file and plotted onto a geographical map. As a result of the different assessments the spatial extent of the impact of drill cuttings is for old (drilled before 1993's prohibition of discharging drill cuttings containing more than 1 % of oil) drilling sites of maximal 125 m, for average drilling sites of maximal 60 m and for recently drilled sites of maximal 250 m from the drill hole. In general, the visual assessment was mostly reliable (variance of about 10 m) to detect the spatial extent of impacts of drill cuttings. However, for locations drilled before 1993 the variance was higher, because natural sedimentation had occurred during the intervening period, and so the sediment surface did not always show the impacts which remained below the surface of the habitat. Thus visual assessments






Bachelor Thesis from the year 2016 in the subject Environmental Sciences, grade: 1,0, University of Kassel (Akvaplan-niva, Norway), language: English, abstract: The centre of interest for this Bachelor thesis is the visual assessment of drill cuttings at the sea floor around oil and gas drilling locations in the Barents Sea. The purpose is to detect the spatial extent of impacts on the sediments. In order to validate the reliability of visual assessments, the method is compared to the results of benthic macrofaunal analysis, which are an approved indicator of sea-floor assessments. The results of the visual assessment are also compared with Underwater Hyper-spectral Imaging (UHI), which is a tool under development for sea-floor assessments. In September 2015 six drilling sites of different age categories were investigated: recent (less than 8 weeks, post-drill), average (3 to 15 years) and old (more than 20 years). Video transects were carried out, and grab and core samples were obtained by a Remotely Operated underwater Vehicle (ROV). For sampling the UHI transects a push-broom scanner was attached to the ROV. The visual inspection of the video transects was recorded in a log file and plotted onto a geographical map. As a result of the different assessments the spatial extent of the impact of drill cuttings is for old (drilled before 1993's prohibition of discharging drill cuttings containing more than 1 % of oil) drilling sites of maximal 125 m, for average drilling sites of maximal 60 m and for recently drilled sites of maximal 250 m from the drill hole. In general, the visual assessment was mostly reliable (variance of about 10 m) to detect the spatial extent of impacts of drill cuttings. However, for locations drilled before 1993 the variance was higher, because natural sedimentation had occurred during the intervening period, and so the sediment surface did not always show the impacts which remained below the surface of the habitat. Thus visual assessments


Bachelor Thesis from the year 2016 in the subject Environmental Sciences grade 10 University of Kassel Akvaplanniva Norway language English abstract The centre of interest for this Bachelor thesis is the visual assessment of drill cuttings at the sea floor around oil and gas drilling locations in the Barents Sea. The goal is have consistent logs from one borehole to the next. As a result of the different assessments the spatial extent of the impact of drill cuttings is for old drilled before 1993s prohibition of discharging drill cuttings containing more than 1 of oil drilling sites of maximal 125 m for average drilling sites of maximal 60 m and for recently drilled sites of maximal 250 m from the drill hole. Environmental Impacts of the DeepWater Oil and Gas Industry A Review to .


Barents Biuro

Although the majority of material released is buoyant and rapidly disperses within the water column. The locations range from newlydrilled to around 30 years postdrilling. Frete GRÁTIS em milhares de produtos com o Amazon Prime. by A Mosbech 2007 This document is a strategic environmental impact assessment SEIA of activities related . Comprar Drill cuttings in the barents sea and their environmental footprint a visual assessment of the seabed condition grin publishing Descontos de até 30 Em . A Visual Assessment of the Seabed Condition Refit EaCoralie Amazon.com.au Books. health and safety issues and socioeconomic costbenefit assessments. The locations range from newlydrilled to around 30 years postdrilling. Additionally visual studies are done around the wells to see sea floor impact of drill cuttings. Sea otter distribution is broader covering the North Pacific and southern Bering Sea whilst marine otters are restricted to the Pacific coast of South America. Minstry of the Environment Oslo 212 In. A Visual Assessment of the Seabed Condition dla 17985 z. A Visual Assessment of the Seabed Condition. Drill Cuttings Deposition Produced Water and Storage Displacement Water Modelling.


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