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As you don't say which version of OBIEE it's not possible to point you to the right certification matrix but you can find all of them here: http://www.oracle.com/technetwork/middleware/ias/downloads/fusion-certification-100350.html
The answer will be there inside based on your OBIEE.
I guess I remember that DB 12c is certified only with WLS 10.3.6, but double check in the certification matrix.
(Not certified doesn't mean it wont work, but if you have any issue you will not be able to ask support to Oracle as your aren't on a certified platform)
Sorry about that its OBI Standard Edition One.