"Under the low-carbon fuel standard, refiners and petroleum marketers will be required to track their supplies back to the wellhead."

How is it possible to track supplies back to the wellhead?

"This means marketers will have to provide an assessment of the carbon intensity of the fuel, based on guidelines being produced by staff at the Air Resources Board."

Are they referring to content of the final product, or the process that created the product? If it's the process, I would think Connacher would be in a preferred position.