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Montana – North Dakota? Middle Member Bakken Play

Montana – North Dakota? Middle Member Bakken Play. Julie A. LeFever North Dakota Geological Survey. Williston Basin. AB. SK. MB. MT. ND. SD. WY. Richland Co. McKenzie Co. ND. Study Area. MT. Bakken Formation. Geology Stratigraphy Lithology Depositional Environments/History

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Montana – North Dakota? Middle Member Bakken Play

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  1. Montana – North Dakota?Middle Member Bakken Play Julie A. LeFever North Dakota Geological Survey

  2. Williston Basin AB SK MB MT ND SD WY Richland Co. McKenzie Co. ND Study Area MT

  3. Bakken Formation • Geology • Stratigraphy • Lithology • Depositional Environments/History • Age • Source Rock Potential

  4. Stratigraphy Three Forks Formation (Devonian) Conformable & Unconformable 250 ft thick Shales, dolostones, siltstones, and sandstones “Sanish Sand” Sublittoral to supralittoral

  5. Three Forks Fm. 10608 ft. SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins

  6. Stratigraphy Bakken Formation • Nomenclature • Defined in 1953 • Amerada Petroleum - #1 H.O. Bakken • Restricted to the Subsurface • 105 ft thick • upper and lower shale • middle limestone member

  7. Isopach of the Bakken Formation

  8. Distribution of the Bakken Shale

  9. StratigraphyBakken Formation • Lithology • Lower Shale Member • 50 ft thick • Dark brown to black, fissile, non-calcareous, organic-rich shale • Quartz, pyrite • fossils - conodonts, algal spores, brachiopods, fish teeth, bones, and scales • Fractured with oil staining

  10. Isopach of theLower Bakken Shale

  11. Bakken/Three ForksContact 10604.5 ft. SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins

  12. StratigraphyBakken Formation • Middle Member • 85 ft thick • 5 different lithofacies • Calcareous siltstone to sandstone, dolostone, silty limestone, and oolitic limestone • Locally productive

  13. Isopach of theMiddle Bakken Member

  14. Lithofacies of the Middle Member Upper Shale Lithofacies 5 - Siltstone Lithofacies 4 – Interbedded Dark Grey Shale and Buff Silty Sandstone Lithofacies 3 - Sandstone Productive Lithofacies 2 – Interbedded Dark Grey Shale and Buff Silty Sandstone Productive Lithofacies 1 - Siltstone Lower Shale (From LeFever and others, 1991)

  15. Middle MemberLithofacies 2 SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins

  16. Middle MemberLithofacies 2 10585 ft. SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins

  17. Upper Shale/Middle MbrContact 10582ft SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins

  18. StratigraphyBakken Formation • Upper Member • Maximum extent of the Bakken • 23 ft thick • Conformable and Unconformable • Laminated to massive with poorly sorted beds of silt-sized material • Lag sandstone

  19. Isopach of theUpper Bakken Shale

  20. Bakken FormationUpper Shale Member 10580 ft. SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins

  21. Stratigraphy • Lodgepole Formation • Conformable • 900 ft thick • “False Bakken”; Pelmatozoan Limestone • 5 major lithofacies representing a marine transgression

  22. “False Bakken”

  23. Lodgepole Fm.False Bakken 10562 ft. SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins

  24. Lodgepole Fm.Pelmatozoan Limestone 10564 ft. SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins

  25. Bakken Formation • Depositional Environments/Age • Stratified water column offshore, marine environment • Bakken Shales • Anoxic bottom conditions • Middle Member • Aerobic marine to marginal marine conditions • Devonian/Mississippian

  26. Depositional History • Three Forks Formation • Shallow marine to terrestrial sedimentation • Bakken Formation • Transgression • Shales – anoxic conditions • Middle Member – normal, shallow marine • Non-deposition/erosion • Lodgepole Formation • Normal marine conditions

  27. Source Rock Potential • Total Organic Content – 0 to 40% • Decrease towards depositional edge • Kerogen • 70-90% amorphous • 0-20% herbaceous • 30% coaly • 5% woody • Formed in subaquatic oxygen-restricted environment

  28. Source Rock Potential • Hydrocarbon Generation • Depth of 9000 ft • 100o C • Volume of Oil Generated • Up to 413 billion barrels (ND & MT)

  29. Immature Onsetof Generation Intense Generation Source Rock Maturity Zones

  30. Richland County 80 Producing Fields1.Red River Fm2. Madison Fm 3. Bakken Fm4. Duperow Fm5. Interlake Fm 20 Fields produce(d) from the Bakken Formation

  31. Bakken FormationRichand County, MT • Historically – 46 wells have produced from the Bakken + a few commingled wells • Currently – 31 wells reported production in 2000 Total production for 2000 = 145,323 bbls oil

  32. Richland County • 555 Wells Examined inRichland County • Data Included: • Last Charles Salt • Lower Lodgepole • Bakken Formation • Porosity zone • Three Forks Formation • Devonian Prairie Salt • Combined with Existing • ND Data

  33. Extent of Data

  34. BLCS Structure Map ft Contour Interval Montana North Dakota

  35. Formation Limits Bakken Formation Upper Middle Lower Prairie Salt Edge Montana North Dakota

  36. Isopach of the Bakken Formation ft Contour Interval Montana North Dakota

  37. Isopach of the Lower MemberBakken Formation Bakken Limit ft Contour Interval Montana North Dakota

  38. Isopach of the Upper MemberBakken Formation ft Contour Interval Montana North Dakota

  39. Isopach of the Middle MemberBakken Formation ft Contour Interval Montana North Dakota

  40. Balcron Oil - #44-24 VairaSESE Sec. 24, T.24N., R.54E. GR DensityPorosity Lodgepole Fm. 10000 upper Bakken Fm. middle Three Forks Fm. Neutron Porosity

  41. Bakken Middle MemberPorosity Zone Porosity Zone Contours ft 70 65 60 55 50 45 40 Contour Interval 35 30 25 20 15 10 5 0 Montana NorthDakota

  42. Bakken Middle MemberPrairie Salt Prairie Salt Edge ft Contour Interval Montana North Dakota

  43. Bakken Middle MemberPrairie Salt PrairieSalt ft Contour Interval Montana NorthDakota

  44. Middle MemberPorosity Zone % Contour Interval McKenzie Co. Richland Co. Contour Interval: 2 ft.

  45. Bakken Middle MemberSandstone Unit ft Richland Co. McKenzie Co. Contour Interval Montana North Dakota

  46. Shell Oil Company - #12-6-44 U.S.A.SENWNW Sec. 6-T.148N.-R.104W. DensityPorosity GR Lodgepole Fm. Upper Shale Bakken Fm. 10600 MiddleMbr Neutron Porosity Three Forks Fm.

  47. Can the Bakken Play Extend into North Dakota? • YES! • Production from the same interval • Mappable log characterisitics from MT into ND • Prominent trends illustrated on Bakken maps • Other intervals within the middle member that have similar potentials

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