For the purposes of this Act, a person is taken to have held an interest in, or in relation to, a retention lease at a particular time if the person was, at that time, entitled to receive receipts from the sale of petroleum, or marketable petroleum commodities produced from petroleum, recovered from:
(a) if the time is a time after the retention lease was granted--the retention lease area; or
(b) if the time is a time before the retention lease was granted--the exploration permit area of the exploration permit to which the retention lease is related.