Common tank battery,common meter agreements

Does a common tank battery or common meter agreement between 2 separate,but adjacent, leases with common mineral ownership relieve the lessee from the requirement to continue to measure the oil or gas that is being produced from a lease. They are not unitized. One of the leases subject to this common tank agreement is no longer, in my opinion, commercially productive but the lessee won't release it because the other lease does have 5 wells on it. However the lessee cannot say how much production is coming from the non-productive lease, if any, because of the common tank/meter agreement. Is there an implied covenant, or regulatory requirement that would require the lessee to account for the production from each lease?