Global oil discovery in 2019 estimated to be 20 billion barrels

I think there may be some confusion here.

According to various sources, including the United States Energy Information Administration (EIA) and the International Energy Agency (IEA), the global oil discovery in 2019 was not estimated to be 20 billion barrels.

In fact, the EIA reported that in 2019, the world's oil discoveries totaled around 4.5 billion barrels of oil equivalent (BOE), which includes both crude oil and natural gas liquids. This is a relatively modest increase from the previous year's discoveries.

It's worth noting that oil discovery rates have been declining in recent years, partly due to the increasing difficulty and cost of finding new oil reserves, as well as the shift towards more challenging and complex exploration areas.

If you have any specific sources or references that suggest a global oil discovery of 20 billion barrels in 2019, I'd be happy to take a closer look and provide more context.