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School of Earth and Environment University of Leeds. Rob Butler and Bill McCaffrey. Outline STRUCT-STRAT The linked study of deformation and depositional processes on submarine slopes VIRTUAL SEISMIC ATLAS Knowledge Transfer community initiative. Please pass comments back to:

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Rob butler and bill mccaffrey

School of Earth and Environment

University of Leeds

Rob Butler and Bill McCaffrey

Outline

STRUCT-STRAT

The linked study of deformation and depositional processes on submarine slopes

VIRTUAL SEISMIC ATLAS

Knowledge Transfer community initiative

Please pass comments back to:

butler@earth.leeds.ac.uk

mccaffrey@earth.leeds.ac.uk

http://earth.leeds.ac.uk/struc-strat/project-descriptions


Rob butler and bill mccaffrey

CONFIDENTIAL

A NEW RESEARCH PROGRAM

STRUCT-STRAT

The linked study of deformation and depositional processes on submarine slopes

Rob Butler and Bill McCaffrey with Martin Casey

Outline

Background – research at Leeds

Outline the scientific challenges

Research Program

Pathfinder project

Consortium project

Please pass comments back to:

butler@earth.leeds.ac.uk

mccaffrey@earth.leeds.ac.uk

http://earth.leeds.ac.uk/struc-strat/project-descriptions


Rob butler and bill mccaffrey

Leeds Research Environment

School of Earth and Environment (SEE)

One of the largest geoscience groups in the UK.

Long history of academic and applied research

Large research-student community (40+)

Unique range of industry-focused taught Masters courses

(Geophysics, Structural Geology, Engineering Geology)

Links to industry through consortium research and spin-off companies (e.g. RDR)


Rob butler and bill mccaffrey

  • Turbidites Research Group (TRG) 12 years deep marine clastics research

    • Bill McCaffrey plus Rob Butler, Jaco Baas,

    • Jeff Peakall + 8 PhD students + externals

  • Rock Deformation Research (RDR)

  • Leading structural consultancy and applied research group.

    • Rob Knipe et al.

  • Geophysics Group

  • Greg Houseman, Lykke Gemmer and students.

    • Numerical modeling of lithosphere deformation

    • Graham Stuart, Roger Clark et al.

    • Seismics: MSc Geophysics

  • Engineering Geology Group etc

  • Bill Murphy, Lucy Phillip: geotechnical studies,

    • mass wasting. PhD and MSc students – linking

    • with Civil Engineering groups in Leeds

  • + external collaborator: Scott Bowman, President of PetroDynamics Development of PHIL Stratigraphic Modelling package


  • Rob butler and bill mccaffrey

    Leeds Research Environment – investigators

    Outlines of the key research personnel in the Struct-Strat project. Collectively

    we have published over 150 research papers and supervised >40 research students.

    Rob Butler

    25 years experience in the structural geometry and evolution of thrust systems.

    Research has developed to use high resolution stratigraphy to investigate thrust-fold

    kinematics. Founding director of MSc Structural Geology with Geophysics.

    Bill McCaffrey

    Currently Director of TRG. Over 15 years experience of deep marine clastics and

    application of research to industry.

    Martin Casey

    Co-investigator. 30 years experience of numerical structural geology, particularly

    the use of finite element methods to investigate deformations. Latterly has applied

    soil mechanical approach to study deformation in poorly consolidated sediments.

    + External collaborator: Scott Bowman, President of PetroDynamics


    Rob butler and bill mccaffrey

    A NEW RESEARCH PROGRAM

    STRUCT-STRAT

    The linked study of deformation and depositional processes on submarine slopes

    Rob Butler and Bill McCaffrey with Martin Casey and Scott Bowman

    OutlineUPDATE – FROM POTENTIAL SPONSORS

    Outline the scientific challenges

    Research Program

    Pathfinder project

    Consortium project

    http://earth.leeds.ac.uk/struc-strat


    Rob butler and bill mccaffrey

    UPDATE – April 2005.

    • Following discussions with possible sponsors we would like to draw out

    • the following key themes:

    • Regional aspects – a main driver here is to develop predictions of slope geometries in the past – using these to predict possible sites of preferential sand accumulation. Beneficial for evaluating new prospects within known slope systems – say when seismic data are poor and the system is subsequently deformed, or to examine consequences.

    • Prospect scale – Understanding links between fold-thrust development and nature of strat template may reduce risk in poorly imaged fore-limb areas.

    • All scales – feedbacks between rates of deformation and deposition could have large control on scales/timing/distribution of remobilisation.

    • 4. Relationship with proprietary data. Data are needed – the Pathfinder phase will need to establish nature of release/confidentiality of proprietary data within the consortium (and for publication).


    Rob butler and bill mccaffrey

    External controls on deep water clastic systems

    The bathymetric influence on sediment deposition

    e.g. TRG

    Sediment patterns on slopes.

    Multi-disciplinary

    project

    geometry

    mechanics

    Structural evolution

    Why?

    Sed load drives/modifies slope structure

    Sed style impacts wedge rheology

    Sed architecture impacts on fault zone evolution

    Consortium

    Pathfinder

    Establish workflows

    Focus deliverables

    Develop partnerships


    Rob butler and bill mccaffrey

    OUTLINE OF RESEARCH CHALLENGES

    Sedimentation and deformation on submarine slopes

    Deposition/strat architectures

    deformation styles

    Scales…

    The slope system (wedge dynamics)

    Individual/groups of folds/thrusts

    Evolution of fold-thrusts and fault zone architecture


    Rob butler and bill mccaffrey

    Slope grading processes

    different stable (“equilibrium”) slopes…

    Shallow-detachedMTCs

    Deposition of turbidites

    Whole prism creep

    Controls

    1 – tectonic subsidence (thermal, inversion etc)

    2 – sediment load (flexural isostatic)

    3 – sediment input (timing, flux, nature)

    4 – gravity spreading deformation


    Rob butler and bill mccaffrey

    Evolution of active submarine slopes:

    sediment load drives deformation, deformation impacts on sediment distribution.

    Predict slope-dip and rugosity

    create synthetic slopes – input to facies distribution models

    Probabilistic prediction of the distribution and characteristic architectures of sand bodies on deformed submarine slopes.

    before

    after


    Rob butler and bill mccaffrey

    A 2-D finite element model of the system geometry,

    populated with rheological properties.

    Differential sediment loading and associated surface slope modification

    A diffusion-based sediment dispersal model,

    or proprietary strat-modelling packages.

    viscous

    plastic

    SEDIMENT

    WEDGE

    e.g. salt

    DETACHMENT

    e.g. mud (rate-dependent)


    Rob butler and bill mccaffrey

    Strat model

    deformation model

    A key target is to investigate sensitivities in both model elements to choices of time increments, rheological properties, deposition rules and the spatial resolution


    Rob butler and bill mccaffrey

    Multiple scenarios

    Strat model

    PetroDynamics PHIL simulator.

    deposition

    flexural

    subsidence

    compaction

    Build wedge geometry

    Impose a vector deformation field onto the strat model, (which entails modification of the seabed profile)

    thermal

    subsidence

    Finite element

    deformation model

    Rheological

    properties

    Refine

    wedge

    geometry

    A key target is to investigate sensitivities in both model elements to choices of time increments, rheological properties, deposition rules and the spatial resolution

    Gravitational

    deformation

    Multiple scenarios


    Rob butler and bill mccaffrey

    Sedimentation and deformation in deepwater fold-thrust belts

    Deposition/strat architectures

    deformation styles

    Scales…

    The slope system (wedge dynamics)

    Individual/groups of folds/thrusts

    Evolution of fold-thrusts and fault zone architecture


    Rob butler and bill mccaffrey

    Styles of contraction at toe of slope?

    thrusting

    strain

    Tectonic compaction….

    folding


    Rob butler and bill mccaffrey

    Sedimentation

    during

    thrusting

    Spaced anticlines,

    Little overlap

    Little syn-thrusting

    sedimentation

    Stacked with overlap


    Rob butler and bill mccaffrey

    Sediment loading conditions influences mechanics of folding and faulting…

    Structural activity influences mini-basin evolution


    Rob butler and bill mccaffrey

    Stratigraphic controls on and faulting…

    fault zone/forelimb architecture

    Sedimentation and deformation in deepwater fold-thrust belts

    Deposition/strat architectures

    deformation styles

    Scales…

    The slope system (wedge dynamics)

    Individual/groups of folds/thrusts

    Evolution of fold-thrusts and fault zone architecture


    Rob butler and bill mccaffrey

    WNW and faulting…

    ESE

    (Example case study: Butler & McCaffrey 2004, Mar Petrol Geol)



    Rob butler and bill mccaffrey

    WNW and faulting…

    ESE


    Rob butler and bill mccaffrey

    Substrate carbonates and faulting…


    Rob butler and bill mccaffrey

    ESE and faulting…

    WNW


    Rob butler and bill mccaffrey

    • Interaction between and faulting…

    • distributed deformation

    • BUCKLING – and

    • thrust faulting…

    Mechanical behaviour of multilayer influences thrust-fold zone evolution –

    and hence final architecture


    Rob butler and bill mccaffrey

    Sedimentation and deformation in deepwater fold-thrust belts and faulting…

    Deposition/strat architectures

    deformation styles

    Scales…

    The slope system (wedge dynamics)

    Individual/groups of folds/thrusts

    Evolution of fold-thrusts and fault zone architecture


    Rob butler and bill mccaffrey

    STRUCT STRAT ISSUES and faulting…

    modelling

    observations

    Large-scale slope evolution

    Numerical modellingDatabase of depositional/structural styles on modern slopes

    Deep-water fold-thrust belts

    Quantify structural architectural elements and relate to deposition

    Model sediment loading on fold-thrust arrays

    Fold-fault zone evolution

    Numerical modelling of multilayers

    Exceptional outcrop analogues - quantified

    Data provision


    Rob butler and bill mccaffrey

    External controls on deep water clastic systems and faulting…

    The bathymetric influence on sediment deposition

    e.g. TRG

    Sediment patterns on slopes.

    Multi-disciplinary

    project

    geometry

    mechanics

    Structural evolution

    Why?

    Sed load drives/modifies slope structure

    Sed style impacts wedge rheology

    Sed architecture impacts on fault zone evolution

    Consortium

    Pathfinder

    Establish workflows

    Focus deliverables

    Develop partnerships


    Rob butler and bill mccaffrey

    Program and faulting…

    Pathfinder: mid-late 2005

    Main consortium: Sept 2006 - 2009

    Costs:

    Pathfinder £26k ($50k) per sponsor

    Early access to results

    Better alignment of research results to sponsor needs

    Discounted participation of consortium

    Main Struct-Strat consortium (3 years)

    £30k per sponsor/year

    Discounted to £27k for Pathfinder or TRG Phase 5 sponsors

    Discounted to £24k for sponsors of both of the above.

    Priorities driven by pathfinder sponsors – activities depend on number of sponsors

    http://earth.leeds.ac.uk/struc-strat/project-descriptions