I'm not aware of any evidence that we are drilling

I'm not aware of any evidence that we are drilling an classic anticlinal structural trap. Where one of the layers acts as the trap once the sediments are deformed upwardly, like a large wrinke on your bed. It begins somewhere across the plane of your mattress and it ends somewhere, depending on how you threw off the bedding when you woke up.

We are dealing with marine sediments (containing the elements of natural hydrocarbon production)  that have been deformed, truncated and overlain  (causing heat and pressure at depth) with more recent marine sedimets overlying them, which contain the anhydrite salts that cap the ends of the truncated older sediments creating oiltraps here and there across the regional geology.  The regional plane or surface seperating the old marine sediments and the newer overburden is called a disconformity. Oiljob

Within the lithologic layering of the regional geology, and non porpous impermeable rock or geolgic component can act as a trap material. The oil exists in the interstitial spaces or voidal areas within the rock. The size of the voids (porosity) and the interconnectivity of the pores or voidal areas is the permeability. A rock can contain an enormous amount of oil per ton of rock and not be commercial because the permeablity is so small that the oil cannot get to your drilled hole. That is why we frack, acidize, and utilize steam to enhance the ability of oil to flow through the rock. There are no pools of oil down there unless we artifically create them. We can acidize a limestone and literally create a cavity to allow oil to pool around our casing. That is where you perforate and hopefully natural forces like and water and gas exert pressure on the oil to force it to the surface without need of a pump. But pumps are good too. Oiljob