In which of these scenarios is an unconformity causing the oil and gas to collect in a reservoir rock?
1) When the reservoir rock is tilted and eroded, creating a gap where oil and gas can accumulate.
2) When the reservoir rock is folded and faulted, allowing oil and gas to pool in the folds and fractures.
3) When the reservoir rock is composed of porous and permeable rock layers, allowing oil and gas to flow and collect.
4) When the reservoir rock is overlain by impermeable rock layers, trapping oil and gas beneath.
