1. Formation Water Property Interpolation and Mapping from Wireline Logs for the Table Rock Field in the Greater Green River Basin Patrick Fortson Hunt, Wallace and Associates LLC December 2, 2004

2. Purpose Produce map of Table Rock field displaying location relative to political boundaries Produce map of Table Rock field displaying location relative to political boundaries Combine township/range map with field map Combine township/range map with field map Interpolate formation properties between wells for areas where no data is available Interpolate formation properties between wells for areas where no data is available

3. Overall Goal Determine if water saturated formations can be used as water injection zones for disposal of produced water Determine if water saturated formations can be used as water injection zones for disposal of produced water

4. Southwestern Wyoming Wastelandish and proud of it Wastelandish and proud of it

5. Still beautiful despite its emptiness

6. People are strange, when you’re a stranger People are strange, when you’re a stranger

7. Meteorites abound Meteorites abound

8. Data Sources Wyoming Oil and Gas Conservation Commission Wyoming Oil and Gas Conservation Commission Wyoming Geographical Information Sciences Center Wyoming Geographical Information Sciences Center

9. Southwestern Wyoming Biggest city is Rock Springs – Pop. 23016

10. Well Files from WOGCC Data Available: Production History Production History Well Logs Well Logs Formation Tops Formation Tops Gas/Water Analysis Gas/Water Analysis Perforation Intervals Perforation Intervals

11. Well Records

12. Lack of Data Virtually no water analysis data Virtually no water analysis data

13. Table Rock Field

14. Table Rock Formations Wasatch Wasatch Fort Union Fort Union Lance Lance Fox Hills Fox Hills Lewis Lewis Almond Almond Water Present

15. Wireline Logs Gamma Ray, SP, and Resistivity Log for Fox Hills Water Sand Gamma Ray, SP, and Resistivity Log for Fox Hills Water Sand Other logs give density and neutron porosity, sonic Other logs give density and neutron porosity, sonic SP Deflection Deep Resistivity

16. Static Spontaneous Potential for Determining Water Resistivity and Salinity Rmf to Rmfeq using formation temperature Rmf to Rmfeq using formation temperature

17. SP deflection to Rmfeq/Rweq ratio using formation temperature SP deflection to Rmfeq/Rweq ratio using formation temperature Ratio with Rmfeq to get Rweq Ratio with Rmfeq to get Rweq SSP-Rweq Nomograph

18. Rweq to Rw Rweq to Rw

19. Rw to formation temperature Rw to formation temperature Follow curve to NaCl concentration in ppm Follow curve to NaCl concentration in ppm

20. Problems with Salinity Special software needed for viewing large raster images of logs Special software needed for viewing large raster images of logs Only four wells have enough viewable data to determine salinity Only four wells have enough viewable data to determine salinity Not enough points for good analysis Not enough points for good analysis Geostatistical Analyst will not run with fewer than 10 data points Geostatistical Analyst will not run with fewer than 10 data points

21. Depth to Formation Top and Thickness Depth useful for determining general structure of formation and degree of folding Depth useful for determining general structure of formation and degree of folding Thickness gives idea of pinchouts and volume estimations Thickness gives idea of pinchouts and volume estimations Only Fox Hills and Lewis Formations had data for good interpolation Only Fox Hills and Lewis Formations had data for good interpolation

22. Spatial Analyst Analysis Mask sets boundary of interpolation Analysis Mask sets boundary of interpolation Problems with Kriging Problems with Kriging Inverse Distance Weighted includes Null data points Inverse Distance Weighted includes Null data points

23. Geostatistical Analyst

24. Same general shape as Fox Hills Same general shape as Fox Hills

25. Possible bad data at bottom Possible bad data at bottom

26. Thickens towards top Thickens towards top

27. More Work… Use ArcScene to develop 3D geologic models of formations Use ArcScene to develop 3D geologic models of formations Try to find more data to acquire salinity Try to find more data to acquire salinity

28. Conclusions GIS illuminated well placement and field location GIS illuminated well placement and field location Geostatistical Analyst provides insight into formation property trends Geostatistical Analyst provides insight into formation property trends Free data is good but not good enough Free data is good but not good enough