Geological Setting of North Slope Oil Fields, Alaska: ABSTRACT

Edrich, Steven P.

doi:10.1306/ad462619-16f7-11d7-8645000102c1865d

Cited by 1 publication

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“…The trapping nlechanism of the field is a southwest-dip underneath a Lower Cretaceous unconformity (LCu). This southwest dip is most likely due to extension prior to the LCu, with additional tilting during the Tertiary (Jamison and others, 1980;Edrich, 1987). Production from the Lisburne field is strongly influenced by two sets of naturally-occurring fractures that parallel the fault trends in the field: an east-northeast striking set and a north-northwest striking set.…”

Section: Reyional Geoloyic Settingmentioning

confidence: 99%

Mechanical stratigraphy of the Lisburne Group, eastern Sadlerochit Mountains: A preliminary report of field results

Hanks¹,

Lorenz²,

Krumhardt³

1994

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The Carboniferous Lisburne Group is an important naturally-fractured reservoir in the subsurface of the North Slope of Alaska. The closest exposed section of Lisburne is in the northern part of the northeastern Brooks Range fold-and-thrust belt, approximately 75 miles to the southeast. Lisburne carbonates of the 'Sunset Pass' section of the eastern Sadlerochit Mountains have two donlinant sets of fractures: an early, through-going set striking NNW and a later, more restricted set striking ENE. Both sets of fractures are calcite filled. In general, fracture density increases in calcareous mudstones and/or dolon~itic horizons. There is no obvioiis correlation between fracture density ancl bed thickness.Although the stnlct~lral setting of the Lisburne Group exposed in the northeastern Brooks Range and that of the Lisburne in the subsu~face to the northwest are very different, they both share the NNW striiking fracture set. This suggests that both sections of Lisbilrne fractiired under siillilar (possibly the same) NNW compressional stresses, probably related to NNW-directed thrusting. In both the surface and subs~rface, the ENE stsiking set is most likely related to local structures. This similarity in fracture pattern between the Lisburne of exposed in the Sadlerochit Mountains and the Lisburne in the subsurface suggests that fracture patterns in surface exposures of the Lisburne Group can be used to study subsurface fracture characteristics.

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Section: Reyional Geoloyic Settingmentioning

confidence: 99%