Shallow Well DepthsThe most likely reason the wells were not drilled deeper is that they encountered basement rock, i.e., granite or granite like rock.
The most likely reason this basin has been passed over by the majors for the past 60yrs or so is that this is a shallow basn and does not contian the deep, pressured shales which are the source rock for oil/gas deposits in the shallower resrvoir rocks.
JMO