Abstract The Healdton field, in western Carter County, Oklahoma, is largely confined to the northeast half of T4S, R3W, but extends into adjacent townships. The townsite of Healdton lies within the field's limits. Oil production is principally from the Hoxbar Group (Missourian) of Pennsylvanian age and the Arbuckle Group (Canadian) of Ordovician age. Production was first established in 1913 with subsequent field development resulting in oil production from four shallow Pennsylvanian sandstone bodies—the Healdton sandstones. All of them can be recognized over most of the field with some local discontinuities. Approximately 2,600 wells had been drilled by 1955, covering a production area of more than 7,100 acres. Several of the earlier development wells were drilled into the pre-Pennsylvanian section where minor amounts of Ordovician oil was found. In 1960, the discovery of a commercial reservoir within the Arbuckle brought renewed importance to this already prolific field. The new production is from three dolomite zones—Wade, Bray, and Brown. These zones are restricted to the upper 1,600 ft of a 5,000-ft carbonate section. The Brown zone, the lowermost, has proved to be the only zone of significance. It is crystalline dolomite, approximately 600 ft thick, with good intercrystalline porosity and excellent permeability caused by a highly developed fracture system. The Arbuckle produces from 43 wells within an area of 1,800 acres. Entrapment of hydrocarbons is attributed to a northwest-southeast structural trend which originated in Early Pennsylvanian time and was again activated during Late Pennsylvanian. The Healdton area was subjected to intense uplift and faulting in Morrowan time by the Wichita orogeny. Associated high-angle faulting with displacement of 10,000 ft placed Pennsylvanian shales and sandstones in juxtaposition with Ordovician carbonates. These younger sediments are believed to be the source and means of migration for most, if not all, Arbuckle oil in the Healdton structure. Following an extensive period of erosion, Hoxbar sandstones and shales were laid down over truncated pre-Pennsylvanian rocks, and later folded by the Arbuckle orogeny. Owing to the magnitude of forces affecting pre- Pennsylvanian stratp, the Arbuckle producing structure has closure in excess of 1,500 ft whereas the overlying Pennsylvanian closure is approximately 600 ft. Hoxbar sandstones, from an average depth of 1,000 ft, have yielded about 250 million bbl of oil, and secondary recovery methods are now being employed. The Arbuckle produces from an average depth of 3,900 ft and had a cumulative in excess of 3 million bbl to January 1968.

Abstract The South Palacine field, located in Sees. 16, 21, 22, 23, 26, 27, 28, and 34, T. 2 S., R. 6 W., Stephens County, Oklahoma, was discovered in May 1049. Principal production comes from several sandstone zones in the Hoxbar sequence of upper Pennsylvanian age. Structurally the field is associated with the Wichita Mountains-Criner Hills trend of folding. The Hoxbar group of the Pennsylvanian System rests upon an eroded pre-Pennsylvanian surface, underlain by rocks of Ordovician age and older. Cumulative production to December 1956 was 9,104,605 barrels of oil, with daily production at that time averaging about 1,600 barrels.

Abstract Three-dimensional Stratigraphic analysis of cratonic-basin margins has demonstrated complex genetic interrelations between shelf, shelf-edge, and basinal facies. Application of seismic Stratigraphic modeling has proved useful in analyzing the geometry of platform-margin deposits of the Pennsylvanian Hoxbar Group (Missourian) in the eastern Anadarko basin in Oklahoma. Seismic modeling requires four principal steps: (1) tabulation of petrophysical parameters of the lithologies included in the model; (2) construction of a series of model Stratigraphic sequences along a line of section; (3) generation of synthetic seismograms for each model sequence; and (4) comparison of the synthetic traces with corresponding field traces. Results of such a model study, combined with subsurface geologic data, suggest an interpretation of Hoxbar platform evolution incorporating two outbuilding or progradational depositional episodes separated by an upbuilding depositional episode.

Abstract The North Wildcat Jim field is important because it exhibits conditions under which more shallow production should be found on the flanks of the Arbuckle Mountains. The primary structure is a stratigraphic wedge beneath an unconformity separating beds of Permian age from more steeply dipping beds of the Hoxbar and Deese groups. Secondary structural features include a series of small northwest trending folds and several normal faults. Oil is produced from zones in the Cisco, lower Hoxbar, and lower Deese groups. These zones are mostly lenticular, and may change from sandstone to limestone or may pass into shale in short distances.

Abstract The Carter-Knox gas field is in the southeastern end of the Anadarko basin in southeastern Grady County and northeastern Stephens County, Oklahoma. It produces oil with associated gas from rocks of the Permian System, and from the Hoxbar, Deese, and Springer Groups. A significant gas reserve was discovered in 1956 by deeper drilling which first tested the pre-Pennsylvanian formations. Gas- condensate production is from the Simpson Group, and the Bromide Formation is the most important zone. The Permian strata form an elongate, faulted anticline with shallow dips. The Pennsylvanian strata are eroded deeply beneath the Permian unconformity and form a very steeply dipping, faulted anticline. The pre-Pennsylvanian structure is an anticline parallel with the shallower features but approximately 1 mi west. The Carter-Knox gas field covers an area of approximately 11 sq mi, 1 mi wide and 11 mi long. First full-scale gas deliveries began on December 17, 1959, with approximately 32 million cu ft of gas a day. Gas production previously had been limited to local sales on a temporary contract of 2-10 million cu ft of gas a day. As of January 1, 1960, the Carter-Knox gas field had produced 878,314 bbls of condensate with 6,710,778,000 cu ft of gas.

Abstract The Carter-Knox oil field, located in the southeastern end of the Anadarko basin in southeastern Grady County and northeastern Stephens County, Oklahoma, covers an area of approximately 16.5 square miles, 1.5 miles wide and 11 miles long. The structure is a very steeply dipping, faulted anticline, which was first mapped on the surface in 1916. It produces from the rocks of the Permian System, and the Hoxbar, Deese, Springer, and Simpson groups. The first oil well was completed in 1923. Since the discovery of oil in the Permian, the field has undergone several drilling cycles, the latest being the development of gas-condensate production in the Simpson group which began with a Bromide sand discovery in 1956. As of January 1958, the Carter-Knox field had produced a total of 33,581,015 barrels of oil; and on the same date was producing 3,370 barrels of oil per day from 407 wells, from all zones.

Abstract The North Alma field is located in Secs. 3, 4, 5, 9, 10, 15, and 16, T. 1 S., R. 4 W., Stephens County, Oklahoma. It is near the center of one of Oklahoma’s most prolific oil-producing areas. The field was discovered in 1946 by the Skelly Oil Company and Sun Oil Company No. 1 Williams, located in the SE¼SW¼NE¼ Sec. 16, T. 1 S., R. 4 W. This well was productive from the Sims sandstone of Pennsylvanian age. Production June 1, 1953, was approximately 2,100 barrels per day from 106 producing wells. The total productive area is about 1,700 acres. The field had produced 3,720,000 barrels of oil to June 1, 1953. The structure on the top of the Sims sandstone is a gently folded anticline elongated in a north-south direction with approximately 300 feet of closure. The structure of the Oölitic limestone, the Tussy limestone, and the Pickens sandstone is that of a northwest plunging anticline on which there is about 50 feet of closure. The North Alma structure was formed during the time of the Wichita Mountains and Arbuckle Mountains orogenies. A part of the Springer section is missing over the structure owing to truncation. Faulting has been recognized in some of the wells of the pool. Production is from formations of the Hoxbar, Deese, and Springer groups of the Pennsylvanian System.