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Geologic control of natural marine hydrocarbon seep emissions, Coal Oil Point seep field, California

Formation of seep bubble plumes in the Coal Oil Point seep field

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Compositional variability and air-sea flux of ethane and propane in the plume of a large, marine seep field near Coal Oil Point, CA

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Geologic control of natural marine hydrocarbon seep emissions, Coal Oil Point seep field, California

Content Provider	Springer Nature Link
Author	Leifer, Ira Kamerling, Marc J. Luyendyk, Bruce P. Wilson, Douglas S.
Copyright Year	2010
Abstract	High-resolution sonar surveys, and a detailed subsurface model constructed from 3D seismic and well data allowed investigation of the relationship between the subsurface geology and gas-phase (methane) seepage for the Coal Oil Point (COP) seep field, one of the world’s largest and best-studied marine oil and gas seep fields, located over a producing hydrocarbon reservoir near Santa Barbara, California. In general, the relationship between terrestrial gas seepage, migration pathways, and hydrocarbon reservoirs has been difficult to assess, in part because the detection and mapping of gas seepage is problematic. For marine seepage, sonar surveys are an effective tool for mapping seep gas bubbles, and thus spatial distributions. Seepage in the COP seep field occurs in an east–west-trending zone about 3–4 km offshore, and in another zone about 1–2 km from shore. The farthest offshore seeps are mostly located near the crest of a major fold, and also along the trend of major faults. Significantly, because faults observed to cut the fold do not account for all the observed seepage, seepage must occur through fracture and joint systems that are difficult to detect, including intersecting faults and fault damage zones. Inshore seeps are concentrated within the hanging wall of a major reverse fault. The subsurface model lacks the resolution to identify specific structural sources in that area. Although to first order the spatial distribution of seeps generally is related to the major structures, other factors must also control their distribution. The region is known to be critically stressed, which would enhance hydraulic conductivity of favorably oriented faults, joints, and bedding planes. We propose that this process explains much of the remaining spatial distribution.
Starting Page	331
Ending Page	338
Page Count	8
File Format	PDF
ISSN	02760460
Journal	Geo-Marine Letters
Volume Number	30
Issue Number	3-4
e-ISSN	14321157
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-03-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geology
Content Type	Text
Resource Type	Article
Subject	Environmental Science Geotechnical Engineering and Engineering Geology Oceanography

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Geologic control of natural marine hydrocarbon seep emissions, Coal Oil Point seep field, California

Compositional changes in natural gas bubble plumes: observations from the Coal Oil Point marine hydrocarbon seep field

Formation of seep bubble plumes in the Coal Oil Point seep field

Long-Term Atmospheric Emissions for the Coal Oil Point Natural Marine Hydrocarbon Seep Field, Offshore California

Compositional variability and air-sea flux of ethane and propane in the plume of a large, marine seep field near Coal Oil Point, CA

Formation of seep bubble plumes in the Coal Oil Point seep field

A Synthesis Review of Emissions and Fates for the Coal Oil Point Marine Hydrocarbon Seep Field and California Marine Seepage

Measuring Floating Thick Seep Oil from the Coal Oil Point Marine Hydrocarbon Seep Field by Quantitative Thermal Oil Slick Remote Sensing

Compositional changes in natural gas bubble plumes: observations from the Coal Oil Point marine hydrocarbon seep field

Geologic control of natural marine hydrocarbon seep emissions, Coal Oil Point seep field, California

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Geologic control of natural marine hydrocarbon seep emissions, Coal Oil Point seep field, California