Well, I remember an Opeth interview where Mikael said that he came from the progressive and brutal death background, while Peter contributed the "thrashier" riffs. I would guess:
"Forest of October" (3:00, 8:20).
The heavy parts of "The Moor."
Those are the only two that don't quite sound "Mikael-ish," and also, I don't have much time to type. Hope that helps. (???)