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3D STRATIGRAPHIC FORWARD MODELLING

3D STRATIGRAPHIC FORWARD MODELLING. Keyu Liu and Cedric Griffiths CSIRO Petroleum. Presentation Outline. Quantitative stratigraphic modelling Why do we need 3D modelling approach Sedsim computer program Input parameters Application examples. Computer Models. Quantitative (reproducible)

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3D STRATIGRAPHIC FORWARD MODELLING

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  1. 3D STRATIGRAPHIC FORWARD MODELLING Keyu Liu and Cedric Griffiths CSIRO Petroleum

  2. Presentation Outline • Quantitative stratigraphic modelling • Why do we need 3D modelling approach • Sedsim computer program • Input parameters • Application examples

  3. Computer Models • Quantitative(reproducible) • Intuitive(visulisation) • Interactive(instantaneous, what-if) • Comprehensive(handle multiple variables simultaneously) All models are wrong--but some are useful---George box

  4. EXXON’S Approach (Vail) Genetic Sequence Stratigraphy (Galloway) Geomorphology Approach (e.g. Miall’s Architectural Element Analysis or Posamentier’s 3D Sequence stratigraphic Models) Quantitative Sequence Stratigraphy Scale independent, method independent Various Sequence Stratigraphic Models

  5. time eustacy eustatic rate subsidence new space added relative sea level sediment accumulation water depth accommodation time facies thickness sequence geometry water depth shoreline position accommodation sediment accumulation hiatus Quantitative Analysis of Sequences

  6. Sequence Stratigraphic Principles

  7. Sequence Stratigraphic Principles

  8. Chrono Lithology 2D SFM Simulation Output Facies Sequences

  9. Sequence Stratigraphic Principles

  10. sediment supply basin geometry waves sea level Sedsim

  11. Fluid dynamics program to simulate siliciclastic basin fill Scales from metres to hundreds of kilometres 4 to 6 grain sizes Any temporal resolution Longest simulation to date 120 Ma Recent innovations: Slope Failure and Turbidites The Sedsim Model

  12. 300 km G r a i n - s i z e l e g e n d M e d i u m s a n d 200 km F i n e s a n d V e r y f i n e s a n d S i l t t o m u d After 1 Ma of deposition SEDSIM uses the quantitative 3D information concerning sediment supply and relative sea level change, together with regional data on paleoclimate, types of sedimentation etc. to replay basin development and predict reservoir

  13. 300 km G r a i n - s i z e l e g e n d M e d i u m s a n d 200 km F i n e s a n d V e r y f i n e s a n d S i l t t o m u d After 12 Ma of deposition SEDSIM has been used since 1995 on several studies for oil companies such as Shell, Mobil, Texaco, and Woodside to help in understanding the nature and causes of lateral variability in prospectivity and reservoir quality.

  14. P s e u d o - s e i s m i c l e g e n d n e x t 2 0 k a s i m u l a t i o n p e r i o d 2 0 k a s i m u l a t i o n p e r i o d G r a i n - s i z e l e g e n d M e d i u m s a n d F i n e s a n d V e r y f i n e s a n d S i l t t o m u d Well SSE NNW 134.5 Ma 136 Ma 137.5 Ma 139 Ma

  15. 3D Depositional ModelsDifferent models show the effects of input uncertainties in sediment supply rates, subsidence rates, source input locations and sea level curves Litholofical, sedimaentary facies and petrophyscical models Synthetic Seismic Sections Net : Gross & Isopach mapsDepositional phase of trap development Sedsim Outputs

  16. Net:Gross 0.0 1.0 Net:Gross and isopach maps

  17. Synthetic Seismic Sections SEDSIM output Wiggle trace conversion Variable density conversion

  18. Forward Modelling Work Flow Conceptual depositional Model Uncertainty Estimation Develop Net : Gross & Isopach Maps Conversion to Numerical Input Data Determine potential reservoirs and seals Run SFM Simulations Post Depositional Effects Compare to Seismic and Wells

  19. Stratigraphic Forward Modelling provides a 3D sediment distribution profile SFM allows for basin model hypotheses to be tested and quantified SFM allows for the physical processes which formed the petroleum system to be understood SFM allows for accurate interpolation between wells, without resorting to krigging. Summary

  20. Tarim Basin NW Shelf, Australia Gulf of Carpentaria Canning Basin, Australia Dezful Embayment, Iran Sedview demonstration SEDSIM application examples

  21. Sedview Examples and Sedview Examples

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