Just 14 exploration wells were drilled in 2014, which was the lowest number since the beginning of the industry in the 1960s, industry body Oil & Gas UK said in its annual survey.
British finance minister George Osborne pledged to help the industry as he spoke to media ahead of the government's annual budget in March, the last one before a general election in May.
"We will do everything we can to help," said Chancellor of the Exchequer Osborne.
He added: "The oil and gas industry is a vital national asset and we have a plan to back it."
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Exploration and production companies operating on the UK Continental Shelf (UKCS) saw revenues shrink last year to just over 24 billion pounds (USD 37 billion, 33 billion euros) -- the lowest level since 1998, it added.
"The current rate of exploration drilling is the lowest since 1965 and urgent action is required to stimulate activity in the area and generate future development opportunities," the organisation said.
Activity was hit hard last year by rising costs, higher taxation and inadequate regulation, the organisation concluded in its report.
The sector needed to slash costs by 40 per cent to combat slumping oil prices and prevent the further collapse of North Sea exploration.
"This year's activity survey paints a bleak picture but also identifies this region's potential, emphasising the importance of government and industry now putting the right measures in place to secure its long-term future," said Oil & Gas UK chief Malcolm Webb.
"This is crucial not only for the energy security that domestic oil and gas production provides but also for the hundreds of thousands of highly skilled jobs, advanced technology and billions of pounds of exports which the industry underpins.
Global oil prices tumbled by around 60 per cent between June and late January owing to an oversupply in world markets, a weak global economy and a strong dollar that made oil expensive to purchase for holders of rival currencies.
That has weighed heavily on exploration investment and sparked the cancellation of many projects that are deemed unprofitable.
"To maintain the sustainability and competitiveness of producing on the UK Continental Shelf in the current price environment, there needs to be a 40 per cent reduction in unit operating costs to offset the fall in production seen since 2011," the group added.