In the News/Activism forum, on a thread titled Technology draws bead on hydraulic fracturing, thackney wrote:
Do you understand what a sedimentary basin is? And that all commercial oil production is sourced from a sedimentary basin?
Do you understand the difference between fossil and biotic ? Didn’t know T Rexes were found several thousands of feet down but oil has. Some oil make come from “fossil” decomposition but not todays oil. We still don’t know the processes involved. But there is a hint, where radon gas is pleantiful we also find natural gas and oil.
I'll go back to the first question again. A Sedimentary Basin can be tens of thousands of feet deep. It is material laid down from the surface involving lakes or oceans. The world didn't always look like it did today. Depositing a couple of centimeters of sediment every thousand of years adds up to quite a bit over a few hundred million years.
The T-Rex joke is for cartoons and very young children. We get oil today from squeezing fresh algae. Trap algae, plankton and the like in an oxygen depleted environment, warm and pressurize for millions of years, oil and gas.
We still don’t know the processes involved.
Perhaps you didn't, but plenty of others involved in finding and producing these energy sources do.
You might try to answer the questions how multiple layers of oil/gas exist in the same vertical formation sealed by multiple layers of impermeable cap rock exist if brought up from the bottom instead of laid down from the top with the same sediment.