RE:RE:Stacked @DirkIt's a thought experiment..visualize the source rock heating up hydrocarbons rising through a layer of sedimentary rock passing through a permeable layer and then accumulation occurs then some compaction causing a layer within that geological age that had some composition variation to compact now becoming impermeable and then hydrocarbons get caught below it giving two distinct zones in one geological age with no slip faults etc resulting in stacking ..thoughts ljmorin?