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'''Venoco, Inc.''', '''Venoco Corporation''', or '''Venoco''', is a private American oil and gas exploration and production corporation. It is predominantly active in California, where it is a large natural gas producer in the Sacramento Valley, and where it produces oil and gas both onshore and offshore of southern and central California. It has fields and prospects in Santa Barbara County, Monterey County, Kern County, San Luis Obispo County, and Ventura County. Venoco owns and operates the West Montalvo Oil Field and Santa Clara Avenue Oil Field in Ventura County as well as the South Ellwood Oil Field offshore Santa Barbara, California, the Santa Clara Offshore Oil Field and the Sockeye Oil Field in the Santa Barbara Channel west of Ventura, California. It maintains an office in Carpinteria, California, and its corporate headquarters are in Denver.<ref name="SEC">[http://phx.corporate-ir.net/External.File?item=UGFyZW50SUQ9MTI4OTU4fENoaWxkSUQ9LTF8VHlwZT0z&t=1 Venoco 2011 Form 10-K]</ref>