Not sure how much help this is, but your picture looks pretty similar to this one that I took at Madang Resort Hotel (Papua New Guinea) about three weeks ago. (click on the picture for bigger view in my gallery)
It's interesting because most of the orchids at the hotel as far as I can tell are species rather than hybrids - they are usually orchids that have been brought into Madang found growing in the bush nearby somewhere by some entrepreneurial seller. So that would suggest it is possibly a New Guinea lowland species, if that is any help to you.
Phil