Not to conflict with Mr. Hutchinson in any way, just to clarify, the 2560 spacing is far from the end of pooling, the operator could request to downspace in the future to 40-80-160 acre spacings if they use/recomplete the verticle part of a depleted Bakken long lateral well for a short lateral or verticle completion.
I agree with Gary that anything is possible when it comes to royalty distribution between sections, in my opinion though, North Dakota long ago went for convenience and as close as they could get to equality of outcome, on an acre per acre basis, whether merited or not, for all mineral owners in a legal drill spacing. That is why by law any acre is the equal of any other acre in a legal spacing whether each acre has a well on it or not or whether it's being drained or not. Once the state embarked on this path of being unfair to all mineral owners, fair, or more than fair to the operators with allowing them to hold small fields, and not to mention that the state wanted the huge amount of taxes that can exceed the amount of your royalty that you get to keep from your drilled lease. I don't believe that they will change their unfair to all mineral owner stance, because the state has too much invested in it and I would expect literal murder to be done if they tried to change it now.
Pugh clause language in North Dakota [ and possibly anywhere ] should not contain formation language, which is too vague and subject to interpretation, especially since the Oil and Gas regulators can at will declare that from the top of the Bakken to the lowest bench of the Three Forks are a common source of supply, never minding that there may be a impermeable layer of Dolomite between them. You can't depend on vague language for pugh/depth severance clauses. I would use the perforations, highest and lowest, and give them xxx feet above and below because the perforations locations are determinable fact, reported in the well logs, and if the operator wants to hold a formation hundreds of feet lower he had better drill and produce it or expect to have to pay you again for rights to that formation later on.
Gary is absolutely correct about pooling, which I am not expert on but I know enough to at least see which direction trouble is coming from. You want to be included in the pool, it's how they decide who gets paid and how much. It's about the only action I think you would likely prevail in against the operator in North Dakota because the legislature handed the mineral owners over to the oil companies but tried to set things up so nobody could be excluded. If an operator wanted to exclude you through pooling in ND, I think he would have to have a very compelling reason, whether you signed a lease or not, as long as you didn't sign a lease with a pooling clause that gives the operator carte blanche.
Do pay close attention to the pooling clause, something as simple as giving the operator the right to pool during the primary term of the lease, without giving them the recurring right to pool however they please, without permission or hindrance decades into the future could be vital to receiving your share of production. If the operator wants to assign some formation that is not in production to some other operator but you would have to ratify pooling, you will be a player in that future deal, instead of standing on the sideline and wathching your operator collect a fat check for your minerals he never developed.