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Scoop-Stack Playbook 2017

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SCOOP/STACK: PRODUCTION FORECAST UGcenter.com | September 2017 | 51 publicly, from the state regulatory authority—in this case, the Oklahoma Tax Commission and Okla- homa Corporation Commission. To derive accurate EUR results at the formation level, TGS' approach only considers horizontal wells in its original dataset that report single-formation production streams. In other words, wells that report monthly volumes comingled among two or more formations are not included in the calculation of formation EUR statis- tics and averages. TGS includes the undifferentiated Mississippian as a separate EUR calculation as many wells are publically reported as such. Other wells are specifically reported as Meramec and isolating those enables accurate EUR calculations specifically for that zone. Taking these precautions and stan- dardizations with the raw data improves confidence and results in quality, accurate playwide statistics by improving and normalizing the original public data. Results in this study show the highest averge EURs are producing from Meramec, Woodford, Springer and undifferentiated Mississippi. From an oil EUR perspective, the top formations include Springer, Oswego, Meramec and undifferentiated Mississippi. The top gas EUR performance is seen from Woodford, Meramec, undifferentiated Missis- sippi and Springer. Other Pennsylvanian age reser- voirs (Cleveland, Cottage Grove, Oswego, Hoxbar and Tonkawa), which some consider part of the Scoop, are provided for additional reference. TGS is seeing horizontal well activity in these reservoirs producing economically successful EURs. Summary This article has shown numerous high level and detailed examples of forecasting and basic analytics in the Scoop/Stack. Analyzing permit counts, new well locations, drilling costs and completion techniques and calculating EURs show favorable economics with future growth opportunities. Improvements in forecasting models aided by formation assignments to individual well production streams continue to increase the vol- ume of data and quality of interpretation and results. Ongoing efforts for consistency in the assignment of production to ever more granular formation and zone designations assist our industry colleagues leveraging high powered, machine-learning tools. TGS does this through straightforward database cleanup supported with direct input from completion reports and perfora- tion data to better qualify zone assignments. The future is exciting for the Scoop/Stack play as a major U.S. pro- ducing province and the data that help us get there. n Ted Mirenda is general manager, Geological Products & Services, at TGS. James Keay is chief geologist at TGS. The authors wish to acknowledge Alexander Laws for his help in compiling the graphics used herein. FIGURE 13. Scoop/Stack Average EURs by Producing Formation

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