Ann: Oil Search acquisition in Alaska - Presentation, page-22

"...But you guys can do the math, you can pull your calculator out and you can see 40 miles long by two and a half miles wide with about 120 feet of average pay at 640 acres per section. Multiply that by about a 325 barrels per acre foot and you can see that's about a three billion barrel field. "

My calc':
40 miles X 2.5 miles = 100 sq.miles
100 sq.m. X 640 acres per sq.mile = 64,000 acres
64,000 acres X 120 feet = 7,680,000 acre/feet
7,680,000 X 325 barrels per acre/feet = 2,496,000,000 barrels of oil
So that's about a 2.5 billion barrel field.