Reservoir drainage workflow new


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Reservoir drainage workflow new

  1. 1. Reservoir Drainage Workflow using three ESRI ArcGIS extensions Andrew Zolnai Petroleum GIS Training September 2007 1
  2. 2. Original idea • Presentation over 10 years ago to model reservoir depletion using stock ARC/INFO tools • invert a reservoir GRID, model the flow in ARC/INFO, and drape the flow lines on the original GRID • This exercise will do the same with current ESRI extensions • AAPG Search and Discovery CD-ROM Series #1: The Whittier Fault Trend 2
  3. 3. Spatial Analyst work flow • Go to: • ArcGIS Desktop Help > Spatial Analyst > Hydrologic tools • We will use Hydrologic Tools to: • Formation top as a DEM • That will provide the elevation data • Apply Flow Direction and the Flow Accumulation tool • The direction in which water would flow out of each cell is determined • Apply a Conditional filter • All cells with more than 100 cells flowing into them will be part of the stream network • Order, link and create a stream vector • These steps will create a shape file defining the stream network system 3
  4. 4. Petroleum work flow • Stream flow modelling is common in ArcGIS • Water flowing down a DEM • Spatial Analyst extension tools • Subsurface flow is the reverse • Hydrostatic recharge replaces gravity • Formation top replaces topography • Simply inverse stream flow modelling • • • • Invert the topography....................... Run stream flow work flow.............. Build the flow vector network........... Drape it over the original surface • Tools used • Spatial Analyst extension • ArcToolbox for the tools • Model Builder to link all tools 4
  5. 5. Model Builder • ArcToolbox • • • • • • Open it by clicking the red toolbox icon Right-click on ArcToolbox Click on New Toolbox Select the new toolbox just created Right click on it and select New Select Model and a window opens • This is the canvas onto which the various modules will be dragged • Basically it asks for • an input file • a function • an output file • It provides a means to test and edit the routines iteratively 5
  6. 6. Elevation data • Go to the Model subfolder • Get the raster formation top from the exercise data set • Multiply the raster by -1 to invert the elevations • In ArcToolbox, go to Spatial • Analyst Tools then to Math • Likewise click, drag and drop Negate tool into the Model Builder • Double-click on the yellow box & fill in the input and output boxes • Note: if you have a polygon formation top, rasterise it first • Do the same as above first: • ArcToolbox  Conversion tools  To Raster  Feature to Raster 6
  7. 7. Raster flow analysis • The formation top is now like regular slope in ArcMap, and Spatial Analyst tools will be used to study the flow • In ArcToolbox go to Spatial Analyst then Hydrology • Drag Flow Direction onto the Model Builder canvas • Use the previous raster as input • Select an output raster • Keep the rest as defaults • Do the same with Flow Accumulation • Return to Spatial Analyst then Conditional tools • Do the same with Con • Input 0 and 1 as False and True values • This thins the output into a network • Over 100 similar cells form a flow network 7
  8. 8. Vector flow analysis • The conditional tool set a threshold of rasters to create a flow net, which will now be ordered, linked and vaporised into a flow network • Return to the Hydrology tools in Spatial Analyst on ArcToolbox • Do the same as before with Stream Order • Repeat with Stream Link and Stream to Feature • Use file names indicated below 8
  9. 9. Run the model • Click on the black arrow to run it • The tool being run turns red in the canvas • A screen will track its progress and give any errors • If there are any errors • The boxes will show as clear • Double-click on them and look for alarm logos 9
  10. 10. Subsurface flow model • What did we do? • Took a formation top and converted it into a raster slope • Modelled surface water flow as an analog to subsurface petroleum flow • Used • Spatial Analyst extension to process rasters • 3D Analyst extension to display vectors • Model Builder tool canvas to tie it altogether • Caveat Emptor • This is a surface flow model adapted to subsurface flow • Flow will diverge not converge, and create many vertices • To be further refined with additional surficial factors • Further resources • Groundwater flow models in Spatial Analyst • Online help and other industry resources: 10