On and after the effective date of the Natural Gas Market Sharing Act,¹ an owner of a well producing natural gas or casinghead gas may produce from the well that amount of gas which may be lawfully produced therefrom; however, the foregoing shall not diminish the rights of each owner against an overproduced owner by reason of such production, such as the right to an accounting as among co-owners and the right to balance in cash or in kind, as those rights may otherwise be established by law or contract.