The Anadarko Basin is a stacked-pay province, and that stacking is exactly what complicates a formal valuation file.
Few basins in the Lower 48 carry as many separately completed zones under one tract as the Anadarko. A single quarter section in the Oklahoma or Texas Panhandle counties may have Mississippi Lime, Woodford, Cleveland, Marmaton, and Granite Wash production stacked across seventy years of drilling, each interval held by a different operator at a different point in the lease history. Reconstructing an appraisal record here means separating current production from legacy production, and legacy production is where most of the older abstracts get thin.
A documentation-first approach starts with the division order file, not the current royalty check. The check tells you what one operator paid last month for one zone. The abstract, the recorded assignments, and the OTC production history tell you what the interest is actually attached to.
In a single-zone play, an appraiser pulls the current operator's production history and calls it done. In the Anadarko, that same pull can miss two or three producing intervals held by prior assignees who never released the deeper rights. We start with the county clerk's assignment index rather than the pumper's report, because the assignment index shows every entity that has ever held a piece of the bundle, not just the one cutting checks now.
Granite Wash and Cleveland completions in Roger Mills, Custer, and Washita counties tend to be the newest activity; Woodford and Mississippi Lime are often the older, quieter producers underneath. A file that only reflects the newest completion undercounts the interest.
A large share of Anadarko acreage has been held by production since the 1970s and 1980s under leases with royalty language that predates modern deduction clauses. Whether post-production costs are being netted out of a current check depends on that original lease form, not on current operator policy, so the appraisal file should include the operative lease or, where the original is lost, the recorded memorandum of lease.
Where multiple zones sit under one original lease, a pooling or unitization order for each zone should be matched to the corresponding production record. Mismatches between the unit description and the tract description are common enough in this basin that they are worth checking before a number goes into a filing.
For a date-of-death or IRS valuation, the record needs to show what was producing, from which formation, at what net revenue interest, as of the relevant date, supported by division order decimals and the assignment chain that establishes the decedent's or grantor's percentage. Anadarko royalty statements typically break production out by well and, increasingly, by formation, which helps.
Where a tract has both an actively producing zone and a shut-in or plugged zone with residual salvage value, both should be documented separately rather than folded into one blended figure, since an examiner reviewing the file will want to see the basis for each component.
Resolve these questions so the appraisal conclusion can be traced to a defined interest, date, method, and evidence set.
Not necessarily. Different formations under the same tract are sometimes operated by different companies under separate pooling orders, so more than one check, or none, can be normal depending on which zones are currently producing.
The county clerk's office typically holds a recorded copy or a memorandum of lease even when the original document has been lost by the family, and that recorded version is usually sufficient for a documentation file.
They are usually separate completions with separate division orders and separate decline profiles, so each should be sourced and documented on its own rather than combined into a single royalty history.
No. We are not licensed appraisers or title attorneys; a formal valuation for estate, IRS, or divorce purposes should be paired with your attorney or CPA's review of the underlying legal work.
A zone can be shut in for mechanical or economic reasons for years while remaining legally held by production, which is why documentation should distinguish current cash flow from the interest's underlying production history.
Carry the same effective date, interest definition, evidence hierarchy, and limitations into these related appraisal procedures.
Oklahoma's SCOOP and STACK plays rely heavily on forced pooling orders. See how OCC spacing and pooling documentation shapes a formal appraisal file.
