> But how long it take to evolve precisely the right conditions to create this reservoir-building machine? I dont understand the nature of your question. A pla

> But how long it take to evolve precisely the right conditions to create this reservoir-building machine? I dont understand the nature of your question. A planet with carbon based life is a reservoir building machine. If you take environmentally available carbon and transform it into fantastically complex molecules through the miracle of biology, these molecules will eventually be buried and break down into a sludge of simpler molecules. The answer to your question here on earth is that as long as there is carbon based life, hydrocarbons in the geology are inevitable.