Petroleum Science - a SpringerOpen journal

"Petroleum Science is a peer-reviewed open access journal published under the brand SpringerOpen. It is a journal on petroleum science and technology in the English edition, sponsored by China University of Petroleum, enjoys the assistance of the Science & Technology Department of CNPC and three research institutes under the three major oil corporations, CNPC, Sinopec and CNOOC....Petroleum Science became open access in 2015. All articles published by then are freely available online...."