The leader of the Green part in England and Wales Zack Polanski said approving Jackdaw and Rosebank would be “a dereliction of duty”.
He said: “Whatever weasel words are used on drilling within new or existing licences, one of the new prime minister’s first significant decisions would be to break Labour’s manifesto pledge.
“Jackdaw’s owner have themselves said that only 27 direct full time jobs would be created if given the go ahead.
“This has nothing to do with boosting the economy for the people of this country and far more to do with boosting obscene profits for fossil fuel companies and their shareholders.
“I made clear in my press conference last week, this needs to be treated for the serious crisis it is, with financial support for homes to keep cool and for fossil fuel giants to pay the costs of extreme weather adaptation.”
A government spokesperson said: “The North Sea remains a vital national asset, supporting jobs, growth and the UK’s energy security.
“We are clear that oil and gas will continue to play an important role in our energy system for decades to come, alongside renewables, nuclear and other low-carbon technologies.
“Our focus is on providing stability and supporting North Sea workers and communities as they continue to make a vital contribution to the UK’s economy.”