[thackney]

Since non-sedimentary layers are mostly impervious; basalt, granite, marble, etc. and sedimentary are porous; would not oil vapors coming up from the core settle in the pervious layers?

As you understand the basement (granite) rock to be impervious, how do imagine vapors are passing through it?

[bestintxas]

“As you understand the basement (granite) rock to be impervious, how do imagine vapors are passing through it? “

Easy. Fracturing.

Relook at what I sent you, Yemen fields produce in fractured granitics. That makes them permeable.