Great stuff, Stu...captures in many ways the duality of Mars from our perspective...Earth-like dunes encroaching on a Moon-like crater...
Ustrax, man, gotta play skeptic here. That "oil seep" looks a lot like most of the other purported water streaks, although interesting how it seemed to mud up that crater on the bottom of the gully. The Olympus Mons feature to me looks like a possible microclimate artifact; perhaps the wind is selectively removing less massive light-colored material and darker, heavier stuff is staying behind.
To quote Carl (hope I get it right): "Extraordinary claims require extraordinary evidence". Petroleum on Mars would be
beyond extraordinary, but I won't believe it unless some future rover lands on one of these things and gets an oil change!
Cool thought, though.