A Texas petroleum drilling company announced Tuesday it has made a large-scale oil discovery off Alaska's North Slope.

Dallas-based Caelus Energy Alaska LLC announced a find of 6 billion barrels of light oil on its state leases in the Arctic Ocean waters of Smith Bay about 450 miles northwest of Fairbanks.

Chief Operating Officer Jim Musselman called the discovery exciting for the state, which receives a majority of its revenue from the oil industry.

"It has the size and scale to play a meaningful role in sustaining the Alaskan oil business over the next three or four decades," Musselman said of the discovery in a prepared statement.

The Smith Bay development could deliver 200,000 barrels per day of light oil to the trans-Alaska pipeline, increasing volume and reducing the average viscosity of oil, which would help extend its viability, the company said.

The discovery is based on 126 square miles of three-dimensional seismic data and a pair of wells drilled this year from ice pads.

The company did not have time to flow test either well. The tests detect flow rates and pressure and help assess the capacity of a field.