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Biomarkers in Tertiary me??lange, western Olympic Peninsula, Washington, U.S.A.

Chemical Geology

By:
, , ,
DOI: 10.1016/0009-2541(91)90066-Z

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Abstract

Middle Eocene to middle Miocene me??lange and broken formations are exposed in the coastal outcrops along the west side of the Olympic Peninsula, Washington. A petroleum geochemical assessment of these geologic units has included the investigation of biomarker compounds. A comparison was made of biomarkers in an oil sample from a middle Miocene reservoir penetrated in the Medina No. 1 well with biomarkers in extracts from two samples of middle Eocene Ozette me??lange (one sample having a strong petroliferous odor, and the other sample lacking this characteristic odor). Distribution patterns of n-alkanes, tricyclic terpanes, pentacyclic triterpanes, steranes, and diasteranes are remarkably similar in the oil and rock extracts. Biomarker maturity parameters indicate higher maturity in the oil relative to the extracts. The presence of 17??(H)-23,28-bisnorlupane, 18??(H)- and 18??(H)-oleanane, and de-A-lupane and an odd-carbon-number dominance of the n-alkanes in the oil and extracts seems to tie the hydrocarbons to a common source that has a significant terrigenous component. ?? 1991.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Biomarkers in Tertiary me??lange, western Olympic Peninsula, Washington, U.S.A.
Series title:
Chemical Geology
DOI:
10.1016/0009-2541(91)90066-Z
Volume
93
Issue:
1-2
Year Published:
1991
Language:
English
Publisher:
Elsevier
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
101
Last page:
110
Number of Pages:
10