Assuming you are thinking of using it for its fuel purposes, thick of oil and gas as just a fancy battery. The stuff in the ground is just energy built up and stored millions of years ago by living things that died. So in a way you are digging up fully charged batteries mostly ready to use, just some converson required.
Making our own requires expending energy to “store” it, like you would charge a battery. This always requires more energy to do than you end up storing. So it really not that efficient and doesn’t make much sense over just using a battery.
We do already make synthetic versions of the byproducts of oil (plastics and the like) where it makes a little nore sense to.
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