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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