Able Oilsands Ltd. is in the early stages of prospecting for petroleum deposits in the Cold Lake region of Alberta. At this point in the prospecting process, Able estimates that deposits exist in naturally occurring accumulations. Which of the following is the CORRECT classification for Able's prospective petroleum deposits?
1) Conventional oil deposits
2) Unconventional oil deposits
3) Shale oil deposits
4) Tar sands deposits