Peregrino Environmental Monitoringof Calcareous Algae – PEMCA

• Presentation

• Introduction and Background

• Carachteristics

• Objectives

• Partners

• Results and Discussion

• Conclusions

• Contributions from the Project

Agenda

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• Developed by Statoil through R&D clause established by Concession Agreement for Peregrino Field;

• Implemented as part of the Environmental Monitoring Programme (“PMA”) from drilling activities;

• Main activities:

• Laboratory studies on the taxonomy and effects from exposure to drill cuttings.

• Development of new tecnologies for monitoring the potential impact from drill cuttings discharge.

Presentation

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• Presence of a calcareous algae bank in Peregrino field;

• Models did not show pile of cuttings over the calcareous algae bank;

• Gaps in scientific knowledge on calcareous algae in Brazil;

Introduction and Background

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• February/2010 to september/2013

• Challenges for monitoring the

rodoliths bank on Peregrino Field;

• Lack of technology developed to

test in laboratory the effects of drill

cuttings discharge over calcareous

algae

BackgroundPrevious experience on deep sea corals (Lophelia pertusa) monitoring along NCS

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Peregrino Field

Calcareous Algae (rodoliths)

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• Red algae – calcite crystals that form crusts

• Live surface – reddish X internal part – dead and colourless

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• Identify relevant species on Peregrino subsea environments (water column and

sediments);

• Establish a methodology for calcareous algae laboratory culture and its associated

fauna;

• Establish limit levels for both acute and chronic toxicity of the drilling cuttings

detritus regarding calcareous algae and its associated species;

• Develop and test a real time technology for the environmental monitoring of the

calcareous algae and its associated fauna.

Objectives

• Jardim Botânico do Rio de Janeiro (JBRJ)

• LABTOX

• Instituto de Biodiversidade Marinha

• Instituto de Estudos do Mar Almirante

Paulo Moreira (IEAPM)

• Universidade de São Paulo (USP)

• Universidade de Bielelfeld - GER

• Prooceano

• SINTEF

• METAS

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Partners

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Results and Discussion

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Taxonomy:

• Over 200 species identified

• 2 new species to science

• Digital catalogue published

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Results and Discussion

Long term tests:

• light reduction x water flow X sediment coverage

• Mesoscale flow system

• Results show effect on algae are caused by burial; and

• Type of sediment and toxic compounds have minor importance

Results and Discussion

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Long term tests:

• Regression Multivariate models

• Highest contribution to fluorescence reduction sediment added

• Non-linear relation

• Water flow and light – minor impact

• Tendency to recovery of fluorescence adaptation to reduced light

Results and Discussion

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Cobertura sedimentar (%) kg.m-2

mm

5 4,0 3,8

10 8,0 7,5

20 10,1 9,5

30 11,1 10,4

50 13,0 12,2

Accumulated sedimentation on the Field is of aproximately 0,1 kg.m-2 in 3 months, hence below reference. Most of the suspension material is from natural sedimentation.

Long term tests:

• Environmental relevance related to fluorescence as a function of sediment coverage

• Establishment of limits and impact categories for env. monitoring

4 campaigns to retrieve andlaunch the lander for data

collection

In situ Monitoring: Lander

LanderSeafloor Structure

Radius Ø: 2,5 m Height: 2,5 mWeight: 3 ton

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Several sensor systems for:

• Turbidity• Light intensity• Temperature• Salinity• Ocean currents on different layers• Particle concentration• Composing and movement• Visual observation of the habitat

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In situ Monitoring: Lander

Main results:

• Images registered that rodoliths can “move” (rolling movements)

• Probably responsible for removing the particulate over the calcareous algae

• Quantification of movement – significant for risk analysis

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Desenvolvimento de tecnologia:

• New lander model: 70% lighter(800kg) and

ROV independent.

• 1st launch in 2013.

• Other projects:

o Kristin Field - Norway

o Troll Field - Norway

o Abu Dhabi

Results Lander

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In situ Monitoring: Sand traps

3 traps originally – monitoring of natural sedimentation and potential imput from particulate discharges

Sampling for:Volume and particle size analysisC and NHydrocarbons (n-alcans and PAHs)Barium contents (presence of barite?)

12 weeks on seabed20 samples every 3 to 5 days7 cruises performed for launching and recovery

No significant variation observed among sand traps and cruises, except for barium drilling activities?

Inputs for the modelling of first 2 years of discharge:

• Daily discharges from Peregrino A and B

• Current data from 2 years

Output:

Maps showing deposition on seabed as a function of time.

Two main goals:

• Correlation of the sediment distribution from drilling particulates from the modelling with

observations from Lander and Sand traps;

• Study of the general distribution and environmental risk of drilling particulates of Peregrino

activities.

DREAM Model

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Results from DREAM Model

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Modelling Results from pre-Drilling phase

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Peregrino BPeregrino A

Risk Analysis

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Categories for impact assessment:

None: 0-10% coverageMinor: 10-30 % coverage

Moderate: 30-50% coverageSevere: >50% coverage

Categorias de impacto Cobertura sedimentar (%) kg.m-2

mm

Nenhum 0 – 10 0 – 8 0 - 7,5

Menor (amarelo) 10 – 30 8 – 11 7,5 – 10,4

Médio (laranja) 30 – 50 11 – 13 10,4 – 12,2

Grave (vermelho) ˃50 ˃13 >12,2

Correspondence Table

Risk analysis

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Conservative approach

Categories for impact assessment:

None: 0-10% coverageMinor: 10-30 % coverage

Moderate: 30-50% coverageSevere: >50% coverage

• The calcareous algae bank represents a rich biological habitat of high

biodiversity.

• Calcareous algae are relatively robust species considering resistance to

sedimentation.

• Calcareous algae have a self-cleaning capacity using its rolling movements by

the currents to continuously clean itself from sediment.

• No evidence of contribution from the drilling activities could be found both in

sediment traps and lander.

• The technology developed and delivered by PEMCA project enables calcareous

algae monitoring in similar situations.

Conclusions

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• Technology delivered for laboratory testing

• Technology improved for subsea monitoring

• Over 10 studentship supports by the project

• Over 20 scientific publications and others under analysis

• A technical group was established by the Brazilian Environmental Ministry

(MMA) and the Brazilian Institute for Petroleoum, Gas and Biofuels (IBP) a

technical group to work on the topic. Statoil is currently leading this work group by

IBP side based on our experience with PEMCA project.

• Publication of “Digital Catalogue of the Benthic Marine Life in Peregrino Field,

Campos Basin, Brazil”.

Contributions of the Project

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Ana Paula B. PintoDPI SSU BRA SERabpi@statoil.comTel: +55 21 34791580

www.statoil.com

2014-12-1026