high-resolution 2d seismic - ths design • water depth • type of installation • expected...

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    HIGH-RESOLUTION 2D SEISMIC

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    HIGH-RESOLUTION 2D SEISMIC

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    DATA PROCESSING

    TEST/MAIN PROCESSING

    Geometry Specification

    Deconvolution

    Sorted into CMPs

    Filtered

    Amplified

    Velocity Analysis

    NMO

    Stacked

    FINAL PROCESSING

    Migration

    EDITING

    Demultiplexed

    Edited

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    3D SEISMIC

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    3D SEISMIC

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    GEOTECHNICAL SAMPLING

    Grab Samplers

    Gravity Corers

    Vibrocorers

    Cone Penetrometers

    Boreholes

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    INTERPRETATION AND PRESENTATION

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    SEABED FEATURES CHART

    Distribution of seabed sediments Topographic features (sands waves

    etc) Rock outcrops Pockmarks Existing infrastructure; pipelines,

    cables etc Wrecks Items of debris Seabed Features Chart should

    comprise interpretation of Echo Sounder, magnetometer and side scan sonar data with seabed samples

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    Entire well assembly is supported on 30 conductor casing, which is set between 20m-40m sub-seabed

    Identify soil profile in the required depth zone

    Locate potential obstructions to installation of conductor; boulders, gravel layers etc

    Identify potential unconsolidated soils / loose sands geotechnical weak units

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    ALIGNMENT SHEET FORMAT

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    SEABED VISUALISATION

    Shaded relief

    Colour coded seabed gradient

    3D perspective

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    SITE SURVEYOPERATIONS

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    THE SURVEYORS ROLE

    Construction of Survey Programme

    Positioning of Vessel

    Positioning of Sensors

    Quality Control of Bathymetry data

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    SURVEY LINE PLAN FOR JACK-UP RIG

    Distances in metres1 km

    Plus tie line to adjacent borehole or survey area

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    SURVEY LINE PLAN FOR SEMI-SUBMERSIBLE RIG

    Distances in metres1 km

    Plus tie line to adjacent core location or site survey

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    SURVEY DESIGN

    Water Depth

    Type of Installation

    Expected Hazards

    Flexibility of Location

    Environmental Conditions

    Time and Cost

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    SURVEY DESIGN

    Dual Pass Survey

    Integrated Surveys

    Dual Streamers

    High Resolution 3D

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    THE SURVEY PLATFORM

    Vessel antenna position

    (reference point)Back deck where side scan sonar, boomer and digital

    seismic equipment is launched

    Bridge

    Instrument room

    (below water line)Living quarters

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    AUV SURVEYS

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    THE DEEP WATER SOLUTION

    Traditional survey methods have numerous drawbacks to the acquisition of geophysical data in Deep Water areas.

    Clients and subsea engineering companies are demanding more resolute and accurately positioned data which these traditional methods cannot provide.

    A significant change in the way that geophysical data is acquired was needed by the survey companies.

    The survey industrys solution:

    The Autonomous Underwater Vehicle (AUV)

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    AUV OPERATIONS

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    AUV OPERATIONS

    Fugros Echo Surveyor AUV

    Kongsberg HUGIN 3000.

    Semi-autonomous vehicle independently powered and controlled (cable free).

    Depth rated to 3000 metres.

    Aided Inertial Navigation System provides extremely accurate positioning.

    Positional accuracy of the AUV is less than 5 metres, significantly better than towed systems.

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    AUV DATA QUALITY

    So what are the improvements in data quality when using an AUV?

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    AUV DATA QUALITY

    Improved bathymetry data

    quality... compared to

    3D seismic

    Bathymetry from 3D seismic data

    AUV mounted multibeam echo sounder data

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    AUV DATA QUALITY

    1 km

    AUV mounted multibeam echo sounder data

    Vessel mounted multibeam echo sounder data

    Improved bathymetry data

    quality...compared to vessel mounted bathymetry data

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    AUV DATA QUALITY

    1km

    High quality bathymetry data

    in all water depths

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    AUV DATA QUALITY

    250 m

    Improved side scan sonar data quality...

    The AUV assures high quality data is always acquired

    Better positional accuracy in all water depths

    Higher quality sonar mosaics

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    AUV DATA QUALITY

    1 km

    Stunning images can be obtained of complex features such as this mud volcano

    This could never be achieved by traditional towfish data in Deep Water.

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    AUV DATA QUALITY

    Improved sub-bottom profiler data quality...

    2DHR Data AUV Chirp Data

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    2 km

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    WHY CARRY OUT AN AUV SURVEY?

    Improved data quality, coverage, positional accuracy.

    Greater confidence in interpretation of seabed & shallow geohazards and definition of geological conditions.

    This increased certainty over the geological conditions aids in deciding the best engineering solutions.

    Hazards are avoided.

    Over-engineering reduced.

    Field development can be completed earlier.

    Significant potential cost savings.

    HOWEVER: This can only be achieved through an integrated interpretation approach using all available data and with competent, experienced staff.

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    INTEGRATED INTERPRETATION STRATEGY

    Bring together all data types and background information together on one platform SMT Kingdom Suite

    SMT

    Multi-layer Sonar Mosaics

    Shaded Relief Bathymetry

    Chirp

    2DHR / 3D

    Contoured BathymetryCultural Data

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    INTEGRATED INTERPRETATION STRATEGY

    Many features can only be properly characterised by the use of several different data types

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    REPORT DELIVERY

    Interpretation Products

    Seabed FeaturesSMT

    Shallow Soils

    Shallow Geohazards

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    Thank You

    HYDROFEST 2008A FAMILIARISATION COURSE GEOPHYSICAL SITE SURVEYTYPES OF SURVEYSGULF OF MEXICOGULF OF MEXICOGULF OF MEXICOGULF OF MEXICONORTH SEA SHALLOW GAS BLOWOUTNORTH SEA SHALLOW GAS BLOWOUTBASIC PRINCIPLEBASIC PRINCIPLESACOUSTIC METHODSECHO SOUNDERSECHO SOUNDERSDTM FROM MULTIBEAM ECHO SOUNDERSIDE SCAN SONARSIDE SCAN SONARSIDE SCAN SONARSIDE SCAN SONARSEISMIC PRINCIPLESSEISMIC PRINCIPLESSINGLE CHANNEL METHODSSINGLE CHANNEL METHODSSINGLE CHANNEL METHODSSINGLE CHANNEL METHODSSINGLE CHANNEL METHODSSINGLE CHANNEL METHODSSINGLE CHANNEL METHODSMULTI CHANNEL METHODSMULTI CHANNEL METHODSMULTI CHANNEL METHODSMULTI CHANNEL METHODSHIGH-RESOLUTION 2D SEISMICHIGH-RESOLUTION 2D SEISMICDATA PROCESSING3D SEISMIC3D SEISMICGEOTECHNICAL SAMPLINGINTERPRETATION AND PRESENTATIONSEABED FEATURES CHARTALIGNMENT SHEET FORMATSEABED VISUALISATIONTHE SURVEYORS ROLESURVEY LINE PLAN FOR JACK-UP RIGSURVEY LINE PLAN FOR SEMI-SUBMERSIBLE RIGSURVEY DESIGNSURVEY DESIGNTHE SURVEY PLATFORMTHE DEEP WATER SOLUTIONAUV OPERATIONSAUV OPERATIONSAUV DATA QUALITYAUV DATA QUALITYAUV DATA QUALITYAUV DATA QUALITYAUV DATA QUALITYAUV DATA QUALITYAUV DATA QUALITYWHY CARRY OUT AN AUV SURVEY?INTEGRATED INTERPRETATION STRATEGYINTEGRATED INTERPRETATION STRATEGYREPORT DELIVERYThank You