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Comparison of offshore and onshore gas occurrences, Eel River basin, northern California

Open-File Report 98-781

By:
, , , , , , and

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Abstract

The Eel River basin of northern California is a upper Cenozoic depocenter containing more than 3,000 meters of sedimentary rock located near the Mendocino triple junction. Active tectonism has resulted in folding, faulting and rapid sedimentation. Both thermogenic and microbial hydrocarbons are known to be present in the sediments. In August 1997, we sampled two submarine gas seeps, one at a water depth of 520 m that supports a chemosynthetic-based ecosystem very near an area of previously recovered gas hydrate. Another vent site was sampled in sand covered with white bacterial mats at a water depth 41 m. We compared the hydrocarbon gas composition and methane isotopic composition of these seeps with land-based gas occurrences that include: 1) a gas seep and 2) gas from a 2360 m-deep gas well.

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Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Comparison of offshore and onshore gas occurrences, Eel River basin, northern California
Series title:
Open-File Report
Series number:
98-781
Year Published:
1998
Language:
English
Publisher:
U.S. Geological Survey
Description:
1 Sheet: 60.0 x 36.0 inches
Country:
United States
State:
California
Other Geospatial:
Eel River Basin
Online Only (Y/N):
N
Additional Online Files (Y/N):
N