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Geoscience For Gis A

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Geoscience For Gis A

  1. 1. Geoscience for GIS Andrew Zolnai 1
  2. 2. Let’s use what we already have at hand • ArcMap: • Many datasets at once is the sweet spot • Simple surface and thickness trends • Model builder to implement workflows • Extensions: • Spatial Analyst (raster integration) • 3D Analyst (simple surface analysis) • Interoperability (link other datasets) • Output (ArcReader, MapBook, Schematic etc.) • Web services • ArcIMS (old but stable and widespread) • Web services (on-line community) • ArcGIS and Image servers (new and improved) • Intent here • Provide rough sketches with existing tools @ hand • As first step to further integrate with other systems 2
  3. 3. ESRI tools vs. Other tools • Upcoming release with simple • Download a script from ESRI grid/contouring in 3D Analyst • ArcScripts page • Enhance current extension with • Download / buy shareware simple industry-standard code • such as ETgeowizard • Use the 3D-, Spatial- or Geostatistical-Analyst • Buy software that extracts, transforms and loads (ETL) • Note current restriction: single ZM per XY (topologic integrity constraint) • Safesoft FME Workbench • Create multi-patches • Use existing integrator tools such as: • not easy to implement but resources • ArcView extensions by CGG, Landmark do exist or Schlumberger • Use ArcMap Model Builder to • Direct data exchange tools such as integrate other desktop • OpenSpirit grid/contouring • ESRI Data Interoperability • note that this is less evident and extension needs some scripting skills (a subset of FME Workbench) • Use ArcGIS Server SDK to integrate • Let ArcMap read web services that post other server-side grid/contouring grid/contours • note that this is not evident and • Such as Petrosys needs programming skills 3
  4. 4. ESRI tools vs. Grid/contours • Evenly spaced points • Unevenly scattered points • 2.5D topography, culture • 3D Wells, reservoirs • Use GRID or TIN directly • 2D / 3D seismic surveys • Use Spatial Analyst • Use gridding algorithm • Interpolate surface from points • To interpolate even datasets • Contour interpolated surfaces • Size / direction to reflect geology • IDW (allow barriers) • Use contouring algorithm • Spline (smooth or tension) • Similar algorithms • Krigging (geologic model) • Model the geology • Display in 3D and Spatial Analyst • Display results • Draping • 3rd party application • Shading to show structures • Read web services • Thickness and trend relationships • Read server services • Use Model Builder • Import into GIS • Link together several processes • Use grid or raster • Use canvas to mimic workflows • Think of 3rd party as pre-process • Overlay other datasets • Think of GIS as post-process • Culture, permits, parks etc. • Link to any tool at left • Satellite imagery, and • GIS is not just for mapmaking • Real-time tracking data 4 • Maps only report from database
  5. 5. Simple Thickness Workflow • ArcMap • Have two horizons as raster files • Raster Calculator is in Spatial Analyst menu • Subtract the two surface to get a thickness • ArcScene • Drape the thickness on the lower surface • Contour from 3D Analyst | Surface Analysis (more complete contouring in next section) • Drape the contours on formation top (that which is seen on logs or seismic) • Extrude them down from the top • Quick area and Volume from thickness • Mimic porosity effect by using Z value • Show simple volumes in vector space • Multi-patches for wellbore representation DATA: from EarthSoft's EQuIS website 5
  6. 6. Contouring Workflow • Three options • IDW (Inverse Distance Weighted, similar to Natural Neighbours) • Non-interpretive computation on neighbouring points • Calculates from fixed raster surrounding sample • Honours faults as polyline barriers • Spline • Force a curved surface through the raster points • Regularised: smoothest shape (stratigraphic plays) • Tension: tune the stiffness (structural plays) • No barriers but tuning parameters • Kriging • Average from a cloud of surrounding points • Can be made very complex (Geostatistical Analyst) • Can be shaped to mimic geology • E.g.: structural trend s.a. fracturing 6
  7. 7. Display Options • Viewing the data • In ArcScene • Use transparency and priority to show various datasets • Use the illumination to view trends • In ArcMap • Use the paint tool to compare overlaps • Use the same tool to verify raster (surfaces) and vector data (faults) coincide 7
  8. 8. Interpretation • How is it interpreted? • If for example thickness increases with elevation (with or without a mirror image if the entire structure is preserved), that may be an indication of thickening via fracturation atop an anticline, and therefore of structural trap and play (below left) • If however thickness decreases with elevation (below right), that may be an indication of a pinch-out and therefore of a stratigraphic trap and play (usually these also occur alone, and do not have an adjacent mirror image). • The presence of conjugate faults (two fault trends that are at a low angle to each other, below left) is often aligned with a regional fold or bend, and may also indicate a structural play. 8
  9. 9. Conclusion • What more can be done? • More factors can be taken into consideration using more Spatial or 3D Analyst and other extensions • Model Builder can be used to • concatenate several repetitive calculations and operations • thus mimic entire workflows • briefly described in next section • Note • ArcMap tools are used out-of-the-box to show what can be with GIS tools as-is • neither scripting nor programming was used here • This will not replace gridding / contouring or reservoir analysis packages • GIS is meant to work in conjunction with those packages, as noted in the opening table 9
  10. 10. Thank you http://www.zolnai.ca Course notes available 10
  11. 11. Model Builder Optional 11
  12. 12. Model Builder - 1 • A canvas allows to link together tools from ArcToolbox: • Based on input data and a process • Output data is next process’s input • Running the model steps through each process: 12
  13. 13. Model Builder - 2 • Resulting model: • Resulting surface: 13
  14. 14. Model Builder - 3 • What was done? • Inverted a formation top into a raster slope • Modelled surface water flow as an analogue to subsurface petroleum flow • Draped the result onto the original formation top • Thus approximated up-slope subsurface fluid flow • What was used? • Spatial Analyst extension to process rasters • 3D Analyst extension to display vectors • Model Builder tool canvas to tie it altogether • Only with available pop-up and drop-down tools • Caveats • 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 surface factors • Such as described in the contouring section above 14
  15. 15. Resources • Best Practices: GIS for Petroleum • ESRI 2007, online PDF • Visualizing integrated three-dimensional datasets (multipatches) • Ford, A • ArcUser (ESRI), January - March 2007 • Introduction to GIS for the Petroleum Industry • Gaddy, D.E. • PennWell, 2003 • Geographic Information Systems in Petroleum Exploration and Development • Coburn, T.C. and J.M. Yarus • AAPG, 2000 • Contouring Geologic Surfaces with the Computer • Jones, T.A., D.E. Hamilton, and C.R. Johnson • Van Nostrand Reinhold, 1986 15

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