COP pays 9.5 billion for 200k barrels from ShellATH is 400 mill for 34,000. COP buys 200,000 bpd divided by ATH 34,000 bpd is 5.8. Round to 5 for easy calculation. Round 9.5 billion to 10 billion. 10 billion divided by 5 is 2 billion for 34,000 bpd.
Divided that by 2 because Canadian oil and equals 1 billion. Divide that by 2 because of Canadian oil again and it equals 500 million. Shows how ridiculously cheap ATH is when pipelines come into play.