Oil and gas explorers are coming off what could be described as a successful year by some standards, particularly when it comes to high-impact drilling in parts of the world.

That, as defined by analysts at Westwood Global Energy Group, is wells targeting new plays and prospects potentially holding more than 100 million barrels of oil or 1 trillion cubic feet of natural gas.

The 27 high-impact discoveries made by wells drilled last year collectively pushed discovered commercial volumes to a level not seen since 2015—about 13 billion barrels of oil equivalent (Bboe), according to the U.K.-based energy market research and intelligence firm. The commercial success rate also hit 32%, a 10-year high.

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