The paper was from Bernstein Researchfrom May 2012 ( From my...

The paper was from Bernstein Research

from May 2012 ( From my research the marginal cost of production have increased since that report)

HIGHLIGHTS:
Our analysis of the 50 largest publically traded oil and gas companies (ex-FSU) shows that cost inflation continues to increase sharply within the global upstream oil and gas industry. In 2011, production costs increased by 26% while the unit cost of production increased by 21%, which was higher than longer term trends. In 2011, the marginal cost of production the same companies increased 10.8% to US$92.26/bbl............for more read the complete pdf

http://xa.yimg.com/kq/groups/18821650/766363617/name/Bernstein+Energy-+Era+of+Cheap+Oil+Over+As+Secular+Growth+in++Upstream+Cost+Inflation+Underpins+Triple+Digit+Oil+Prices_87626.p

http://peakenergy.blogspot.com.au/2012/06/marginal-oil-production-cost-nearing-92.html

www.prepareandprosper.net/oil-production-costs-heading-100-barrel/