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Peter Schaubs - GeoLena November 11, 2015


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Peter Schaubs (CSIRO) presents 'GeoLena' synthetic modelling platform for benchmarking geodata analytical techniques and for testing process modelling

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Peter Schaubs - GeoLena November 11, 2015

  1. 1. reactive transport modelling geostatistical simulation Real World How to synthesize? geologist’s interpretation + interpolation deformation and fluid flow modelling
  2. 2. Why use numerical models? • Serves two purposes: • Creates a synthetic data model based in part on drill hole data and using geologic processes – Can be used to test or compare other algorithms/geostatistics • Through the process of creating the numerical model we are using input data more robustly – Creating better numerical models – Comparing with drill hole data directly Presentation title | Presenter name2 |
  3. 3. Issues • Data density/mesh resolution • Have we modelled the correct geologic processes Presentation title | Presenter name3 |
  4. 4. Types of Numerical Models • Reactive Transport modelling • Numerical simulations which integrate chemical reactions with transport of fluids through the Earth‘s crust – -heat transport – -fluid transport – -chemical reactions • Deformation – fluid flow modelling • No heat or chemistry
  5. 5. Reactive Transport Modelling Gold > 0.1 g/t Spatial mineral maps … … model the Geophysics
  6. 6. Reactive Transport modelling? • What can we use to compare models and data • Presence or absence of minerals • Alteration assemblages • Changes in element abundance • Do we have the capability?
  7. 7. Deformation – fluid flow modelling? • What can we use to compare models and data • Relative amounts of strain • Stress and/or vein orientations • Vein density • Distribution of alteration based on integrated fluid flux – very much a proxy. Presentation title | Presenter name7 |
  8. 8. Workflows Defining the question Pre-processing Meshing and model setup Running the models Post-processing Visualisation and interpretation
  9. 9. Mine-scale numerical model – cutaway
  10. 10. Dilation (positive volume strain) Integrated fluid flux (cumulative fluid flow) Dilation – volume strain
  11. 11. Principal stress orientations – vein orientations σ3 σ1 σ3 σ1 N-S folding model Cross-section of principal stress ellipsoids View to the west
  12. 12. Minimum Principal stress orientations – vein orientations