This makes me wonder: which methods of resource extraction lead to the complete destruction of evidence that resource existed, and which methods lead to a prese

This makes me wonder: which methods of resource extraction lead to the complete destruction of evidence that resource existed, and which methods lead to a preservation of evidence? If you insert a deep well into a fossil water aquifer, and only use 10% of it, will it all have evaporated after 5 million years due to exposure to the elements?