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7/27/2019 Mud Logging and Well Site Geology
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Presented by: Kathleen Neset
Wellsite Geology and Mudlogging
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North Dakota Stratigraphic Column
Bakken Formation~360 Million Years OldPaleozoic EraMississippian/Devonian Period
~110 thick
Three Forks/Sanish~370 Million Years OldPaleozoic EraDevonian Period~240 thick
Bakken
Three Forks
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Stratigraphy
Three Forks Formation
Bakken Formation
Lodgepole Formation
lower
middle
upper
Pelmatozoan limestone
False Bakken
Devonia
n
Missi
ssippian
Sanish
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GR Res
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Lithofacies 7 - Siltstone
Lithofacies 4 Interbedded Dark Grey
Shale and Buff Silty Sandstone
Lithofacies 3 - Sandstone
Lithofacies 2
Interbedded Dark Grey Shaleand Buff Silty Sandstone
Lithofacies 1 - Siltstone
(From LeFever and others, 1991)Lower Shale
Upper Shale
Lithofacies of the Middle Member
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DrillpipeNon-magnetic
Drill Collar
Bent SubMud Motor
Rotating
Sub
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HS (0)
90R90L
45R45L
135R135L
180 (LS)
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Upper SS
Gamma 60-80 API
ROP 30-60 ft/hrLithology Sandstone
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Middle
Stringer
Gamma 90-100+ API
ROP 50 ft/hr
Lithology Shale
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Target
Gamma 30-50 API
ROP 70 ft/hr
Lithology Sandstone
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Base Target
Gamma 60-90 API
ROP 25-40 ft/hr
Lithology Sandstone/
Siltstone
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ThreeForks
Gamma 100+ API
ROP 20-30 ft/hr
Lithology Shale
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ND Research study in currently drilling wellsto determine fracture stimulation growth
continued research frac methods.
Very early in learning Bakken/Sanish.
Bottineau County Spearfish & Three Forks.
Request update study by USGS.
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Widespread Bakken deposits
Phase I initial drilling define limits of pay
Phase II development drilling hold leases
Phase III infill drilling multipad drilling
Phase IV secondary & tertiary recovery
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Phase I
Phase III
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