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According to this article from 2015 How much oil is left on Earth

1.5 trillion barrels of crude oil reserves were left in the world by end 2015

But how much oil was already consumed worldwide since it was started to use massively in the mid 19th century? Is it most of it or a small part of it?

PS: I'm not sure if this question is for Earth Science SE or for Economy SE, if you think it's in the wrong SE please move it.

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  • $\begingroup$ The first petroleum wells were drilled about 1890. Before that oil was accidentally found a few times when drilling water wells. So there was certainly not massive use of petroleum in the mid 19 th century $\endgroup$ – blacksmith37 Feb 6 at 1:48
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Cumulative world oil production at the end of 2017 was approximately 1.36 trillion barrels.

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