If it is leaking above your oil filter (and especially from the back), it probably isn't the oil pan. I've seen a leaking turbo oil drain drip down the back of the valley, which then typically can run down the driver's side of the block (there's a valley drain hole back there - see the attached photo).
The upper oil pan is physically lower than your oil filter, as shown in the last picture.
It is possible that the leak itself is from the oil filter housing or oil cooler. Is it possible to get some photos of the leak?