Preliminary report on solid bitumens in Eocene rocks of Piceance Creek basin, northwestern Colorado

O'Sullivan, R. B.; Ging, Tom

doi:10.3133/ofr87478

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“…or gilsonite because of its resemblance to the solid hydrocarbon of that name found in the Green River Formation in Utah (Carman and Bayes, 1961, p. 28-29). The solid hydrocarbon in the core strikingly resembles a black hydrocarbon present at the surface in nearby areas of the Piceance Creek basin, which on analyses is found to be unlike any previously described hydrocarbon (O'Sullivan and Ging, 1987). Chemical analysis of the solid black hydrocarbon described in the core may show that it is not gilsonite.…”

Section: Introductionmentioning

confidence: 58%

Core description and related data from Atlantic Richfield Company Core Hole 2B Federal drilled in Eocene Green River Formation, Piceance Creek basin, northwestern Colorado

O'Sullivan¹,

Cashion²

1988

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Oil shale, brown to gray, varved, graded fair Tuff, tan, calc, irr top and base Oil slinle, brown to dk gray, varved, graib mod Tuff, tan extremely irr Interbedded mar Is Lone and tuff, abundant contorted bed Oil shale, dk brown to dk gray, grade mod. abundant thin numerous bods of tuff, contorted bedding, many dikes Oil shale, tan to dk gray, grade fair to mod, contorted bedding, numerous tuff beds (est. 40%), lower 5' contains less contorted beds than above, 1/8" siltston at base, dk brown, spotted white, very even top and bottom. Oil shale, tan to dk brown, grade fair to mod, slightly less than above, contain numerous tuff laminae, some irr bedding, tuff bed -top at 1112.1 (1/8" thick)tuff dk brown spotted white, even top and slightly irr base core msg 1113.4-1114.0

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Section: Introductionmentioning

confidence: 58%