Chevron’s appraisal of the Anchor discovery proved successful oil pay in the Lower Tertiary Wilcox Trend, in the US Gulf of Mexico that the company says indicates a significant discovery of potentially hub class scale.
Chevron's Lower Tertiary Trend map. From Chevron.
The original Anchor discovery well is located in Green Canyon Block 807, approximately 140mi (225km) off the coast of Louisiana in 5180ft (1579m water depth.
Chevron began drilling at the appraisal well in June 2015 and encountered 694ft (211m) of net oil pay.
According to the company, a hydrocarbon column of at least 1800ft (549m) in the Lower Tertiary Wilcox reservoirs at Anchor was confirmed. Complete appraisal of the field will require further delineation wells and technical studies.
The original discovery well was drilled in late 2014 to a depth of 33,750ft (10,287m), and encountered 690ft (210m) of net oil pay.
“After the success of the discovery well announced earlier this year, we have pursued appraisal work to further evaluate the results and assess development alternatives to optimize value creation,” Jeff Shellebarger, president, Chevron North America E&P said.
Chevron subsidiary Chevron U.S.A. Inc. is the operator of the Anchor prospect with 55% interest. Partners include Cobalt International Energy (20%), Samson Offshore Anchor (12.5%), and Venari Resources (12.5%).
Chevron has several deepwater projects in the Gulf of Mexico including: Tahiti, Blind Faith, Big Foot and Jack/St. Malo.
Blind Faith and Jack/St. Malo are the company's deepest operated offshore production facilities with water depths of 7000ft (2134m).
Jack/St. Malo began oil production in December 2014.
At Chevron's Big Foot, several setbacks have set first oil back about two and a half years to 2018. The company originally expected first oil in late 2015.