As lease forms become more complicated and longer, it is more the fashion to file a "Memorandum of Oil, Gas and Other Minerals" in the public records where the property is located, in lieu of the original document.
Why would an oil company file a lease in the first place? To impart constructive notice to innocent third party purchasers of the existence of such a lease.
But has he? It depends on the state. A Memorandum of Lease is not a contract, nor a conveyance, it is only a notice that a contract exists. In a pure race to the courthouse state, you could easily argue that if you leased the same lands covered by the Memorandum and filed it of record (the lease) you would be a winner.
To counter that, the Memorandum should contain words of grant, words of consideration, property description and a reference to another document. Now the Memorandum has met the elements of contract and conveyance.
What are the reasons to file a Memorandum of Lease?
In no particular order:
1. It's cheaper to file a 2 page Memorandum of Lease rather than a 40 page lease form. The lessee may have 100 such forms to file and at an average savings of around $150.00 per form, that adds up to some real money.
2. The Lessee would not want ANYBODY to know what lease terms and clauses it has agreed to, revealing to the general public clauses and royalty that it has a history of accepting. The filing of a Memorandum keeps those terms private.
3. The Lessor likewise would not want to place a proprietory lease of record. One that he may have paid an attorney thousands of dollars to draft for him. That would equate to just giving away what he has paid for.
The existence of a Memorandum of Lease is a quick clue that the Lessee is one that can be dealt with. Just because Original Oil and Gas Leases have been filed, does not mean that the Lessee is trading tough on his form. It could just mean that the Lessors are not talented at negotiating oil and gas leases.
Remember, the oil company has the money that you want, they have the expertise and budget to exploit your assets and the landman will negotiate more leases in one week than 10 landowners will negotiate in a lifetime.
If you have a private form oil and gas lease, do not be put off because the Lessee wants to file a Memorandum of Lease. It actually works to both parties benefit.