The document provides information about wellsite geology and mudlogging operations in the Bakken formation in North Dakota. It discusses the roles of geologists and mudloggers who work 12-hour shifts monitoring wells. It also outlines the stratigraphy of the Bakken and Three Forks formations, lithofacies, common logging measurements, drilling phases, and historical drilling results in the area.

1. Presented by: Kathleen Neset Wellsite Geology and Mudlogging

8. Divide McKenzie Williams Burke Mountrail Ward Bottineau Renville McHenry McLean Dunn Stark Billings Oliver Northern Play Southern Play Bakken Areas of Interest

9. Bakken Formation Middle Member Contour Interval 5 ft

11. Stratigraphy Three Forks Formation Bakken Formation Lodgepole Formation lower middle upper Pelmatozoan limestone “ False Bakken” Devonian Mississippian “ Sanish”

12. GR Res

13. Lithofacies 7 - Siltstone Lithofacies 4 – Interbedded Dark Grey Shale and Buff Silty Sandstone Lithofacies 3 - Sandstone Lithofacies 2 – Interbedded Dark Grey Shale and Buff Silty Sandstone Lithofacies 1 - Siltstone (From LeFever and others, 1991) Lower Shale Upper Shale Lithofacies of the Middle Member

14. Hot Gamma ROP Increase Gas Increase Density – Neutron Crossover ROP Increase Gas Increase Clean Gamma ROP Increase Hot Gamma

17. Drillpipe Non-magnetic Drill Collar Bent Sub Mud Motor Rotating Sub

19. HS (0) 90R 90L 45R 45L 135R 135L 180 (LS)

22. Target Upper SS Middle Stringer Base Target Lower Bakken Shale Three Forks

23. Upper SS Gamma 60-80 API ROP 30-60 ft/hr Lithology Sandstone

24. Middle Stringer Gamma 90-100+ API ROP 50 ft/hr Lithology Shale

25. Target Gamma 30-50 API ROP 70 ft/hr Lithology Sandstone

26. Base Target Gamma 60-90 API ROP 25-40 ft/hr Lithology Sandstone/Siltstone

27. Three Forks Gamma 100+ API ROP 20-30 ft/hr Lithology Shale

33. N742 EN Will Trust C

36. Phase I Phase III

45. Paving $1,000,000 / mile Graveling $3600 /mile Rebuild Gravel Road $300,000/mile