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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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slide1

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:

[email protected]

[email protected]

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

slide2

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:

[email protected]

[email protected]

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

slide3

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)

slide4

Leeds Research Environment – key groupings

  • Structure Group 25 years structural research in thrust belts, fold modelling etc.
          • Rob Butler, Martin Casey + 6 PhD students
          • MSc Structural Geology with Geophysics
  • 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
slide5

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

slide6

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

slide7

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).
slide8

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

slide9

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

slide10

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

slide11

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

slide12

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)

slide13

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

slide14

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

slide15

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

slide16

Styles of contraction at toe of slope?

thrusting

strain

Tectonic compaction….

folding

slide17

Sedimentation

during

thrusting

Spaced anticlines,

Little overlap

Little syn-thrusting

sedimentation

Stacked with overlap

slide18

Sediment loading conditions influences mechanics of folding and faulting…

Structural activity influences mini-basin evolution

slide19

Stratigraphic controls on

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

slide20

WNW

ESE

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

slide23

WNW

ESE

slide25

ESE

WNW

slide26

Interaction between

  • distributed deformation
  • BUCKLING – and
  • thrust faulting…

Mechanical behaviour of multilayer influences thrust-fold zone evolution –

and hence final architecture

slide27

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

slide28

STRUCT STRAT ISSUES

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

slide29

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

slide30

Program

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

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