MMS -- Minerals Management Service Home -- MMS Pacific O.C.S. RegionSearchTopic IndexAbout MMSWhat's New -- News & Updates U.S. Department of the Interior
Minerals Management Service Pacific O.C.S. Region

Skip to Main Content
Contact Information
Library
Organization
What's New

Intern Programs
Kids and Education

Environmental Info


Fisheries Biology
Rocky Intertidal Ecology
Lease Info
Boundaries/Maps
Lease -- Summary Report
Offshore Info

Annual Reserves Report

Facts & Figures
G & G Permits Online
Notices to Lessees
OCS Regulations
Platform Information
Resource Reports
Revenue Information
ROTAC
Safety Alerts
Safety Awards


Freedom of Information Act
Privacy Act/Disclaimers
Accessibility
Public Connect



Support Our Troops Logo with Eagle and Flag

Take Pride in America Flag Logo



        Questions?
   Need more information?
           Please Write:
Pacific Public Information

            Comments
     about our website?
    Contact Web Master

Submarine Oil Seep Study

Southern Santa Maria Basin and Western Santa Barbara Channel

Jointly funded by: MMS, USGS, County of Santa Barbara

 

Point Conception at sunset.

Oil seeps naturally all along the coast of California, notably in the Santa Barbara Channel near Coal Oil Point. The widespread nature of oil seeps historically is documented by early explorers and by coast-dwelling Chumash Indians.

Scientists want to know where the seeps are, especially in the less studied areas like the Southern Santa Maria Basin. We also want to know whether we can tell the difference between oil found seeping naturally from the ocean floor and oil being produced from offshore platforms. Since both the seeping oil and the oil production mostly come from the same Monterey formation, up to now, chemists haven’t been able to reliably tell them apart. But this study may let us do that.

Download a printable version of this document.
Submarine Oil Seeps off the Southern Santa Maria Basin


Our Most Recent Cruise

In October, numerous natural seeps were sampled on the ocean floor off Point Conception, off Gaviota and near Coal Oil Point.

A natural tar "volcano."

A natural tar "plate."

A natural tar seep "whip."

Tar seeps found in 100-200 feet of water offshore Point Conception exhibit heavy oil and little gas. Benthic communities common on rocky reefs colonize older portions of the tar.

Natural tar seeps cause oil sheen on ocean surface. Tar seeps visible from the surface at Gaviota come from seeps that resemble flat patties on a predominately sandy ocean floor. A natural tar "pattie."
A bubbly natural oil seep. Tar seeps in the Coal Oil Point area near the underwater seep tents are characterized by gas bubbles and a white, sulfur-eating bacteria called Beggiatoia. The bacteria Beggiatoia.
 

Sampling Seeps for Fingerprinting

Tar “whips” on the ocean floor (left) break off and float to the surface (right). USGS scientists successfully recovered a few for fingerprinting from the water’s surface. (Some photos below are screen captures from live underwater video, hence the image quality is not always consistent.)

A natural tar "whip."

A tar "whip" floats on the ocean surface.

Recovery from the ocean surface of a tar "whip." A natural tar "whip" recovered from the ocean surface. Tom Lorenson, USGS project manager, holds a newly sampled natural tar "whip."
 

Sampling with an ROV

Bringing natural tar seep samples recovered by the ROV onboard. Samples are also recovered using the ROV's (remotely operated vehicle) mechanical arm and are brought to the surface for analysis. The ROV arm places samples into a sampling bucket.

The ROV bucket serves as a container for collected samples.

A "volcano" natural tar seep coexists with the local benthic community.

The ROV arm collects a "tree stump" natural tar seep.

ROV arm collects samples.
The recovered "tree stump" sample.

For more information, contact: Mary Elaine Helix


MMS Accessibility MMS Quality of Information MMS Privacy Policy MMS Freedom of Information MMS Disclaimer

Web Master: Nollie Gildow-Owens
Page content last updated 09/20/2006
Page last published 09/20/2006