Hilight Field in Campbell County, Wyoming was discovered in 1969 and became one of the Powder River Basin’s most significant Lower Cretaceous Muddy sandstone accumulations. Production comes from thin sandstones at an average depth near nine thousand four hundred feet, trapped stratigraphically rather than structurally, with published work attributing more than seventy-four million barrels to those stratigraphic traps. For mineral owners the field is doubly interesting: a long-lived conventional interest that happens to sit in the part of Wyoming where horizontal drilling later transformed the economics of entirely different formations.
The 1969 discovery came during the period when Powder River Basin operators were systematically testing the Lower Cretaceous section. Hilight proved that the Muddy could hold commercial oil in stratigraphic traps rather than only on structures, and the field was developed through the 1970s across a set of sand bodies with distinct depositional origins. That distinction has practical consequences: the offshore bar sands designated A and B have consistently been more prolific producers than the underlying C and D channel sands, so well quality varies across the field in ways a map of the surface will not explain.
Development settled into conventional practice — vertical wells, pressure maintenance, and eventually waterflooding to sustain a reservoir with limited natural drive. Published reservoir descriptions record effective porosity around sixteen to seventeen percent and permeability near one hundred and fifteen millidarcies, with extensive natural fracturing improving deliverability in what would otherwise be tight sandstone. Cumulative figures cited in that literature exceed seventy-four million barrels from the stratigraphic traps, though higher totals are sometimes attributed to the field as a whole and should be treated cautiously.
The modern context around Hilight is the Powder River Basin’s horizontal era. From roughly 2010 onward, operators across Campbell County drilled long laterals into formations that had never been commercial vertically, and land positions in the area were re-leased and traded on that basis. That activity does not change how the Muddy reservoir behaves, but it does change what an unleased or deep-rights mineral position in the neighbourhood may be worth — a distinction owners of legacy Hilight royalties frequently miss.
Hilight produces from thin Lower Cretaceous Muddy Formation sandstones at an average depth of about nine thousand four hundred feet, in stratigraphic traps rather than structural closures. Two reservoir types are present: offshore bar sands, labelled A and B, which are the better producers, and underlying channel sands labelled C and D. Effective porosity runs around sixteen to seventeen percent with permeability near one hundred and fifteen millidarcies, and extensive natural fracturing helps a tight sandstone deliver at commercial rates. Reservoir quality therefore depends on which sand body underlies a given tract.
Recovery at Hilight has depended on pressure maintenance and water injection rather than on any miscible process. In thin, fracture-assisted sandstone reservoirs, waterflooding both supports pressure and sweeps oil toward producers, but the fracture network that helps deliverability can also channel injected water past the matrix it is meant to displace. That tension is why fields like this deliver long, low-rate production instead of dramatic flood responses. The result for a royalty owner is durability: small monthly amounts that have continued for decades rather than a step change in income.
Two very different values can attach to the same Campbell County tract: a legacy Muddy royalty that pays modestly and declines slowly, and deeper or shallower rights that may be attractive to horizontal operators depending on what your deed actually conveys. Owners routinely assume the old royalty is the whole of their position when the mineral estate is broader. Reading the instrument matters more here than in almost any other Wyoming county. We buy minerals and royalties in Campbell County and provide free written offers.
County-level well data, production charts, and selling guides for the counties this field spans:
Because the field contains two kinds of reservoir. The A and B offshore bar sands are consistently more prolific than the C and D channel sands beneath them, so well performance tracks which sand body a well was completed in rather than distance from the field centre.
Published work attributes more than seventy-four million barrels to the stratigraphic traps at Hilight. Larger totals are sometimes quoted for the field overall, and we would not rely on those without seeing the accounting behind them.
It depends entirely on your deed. Some Campbell County conveyances cover the full mineral estate, others were limited by depth or formation when they were made. That question usually determines whether an interest here is worth a legacy royalty price or considerably more.