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Closing: This interest will be sold with a 14-day closing.
This is for minerals only; no surface rights!
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SAN ANDRES-CLEARFORK, CENTRAL BASIN PLATFORM, AND OZONA ARCH PLAY
The definitive characteristics of this play are: (1) a setting on the Central Basin Platform, (2) dolomitized shallow-water carbonate platform facies with an admixture of silicate sands, and (3) very effective seals provided by evaporite facies. The major drawback for future exploration success of this play is its extensive drilling history.
The play includes oil and subordinate gas accumulations in stratigraphic/structural and structural traps in a platform sequence of carbonate and, to a lesser extent, fine-grained silicate reservoirs of Permian age. The play area is approximately 200 mi long and 110 mi wide and covers all of the Central Basin Platform and the Ozona Arch; it is bounded on the west and south by the Delaware-Val Verde Basins, and on the east by the Midland Basin. Maximum thickness of Permian sedimentary rocks is less than 10,000 ft.
Reservoirs: Reservoir rocks consist of porous and permeable dolomitized carbonates, limestone and fine-grained sandstone. They include skeletal grainstones, dolomite, limestone, calcareous and silty sandstones, sponge and algal dolomitized limestone, dolomitized mud and wackestone, and vuggy to cavernous carbonate beds. Carbonate rocks were deposited in open to restricted platforms and platform margins associated with sea-level fluctuations, shelf-margin reef development, evaporites, and sabkha deposits. Reservoir quality is enhanced by selective dolomitization, dissolution, fracturing, and leaching. Reservoirs are contained in the Permian Guadalupian San Andres, Grayburg, Queen, Seven Rivers, and Yates Formations; they also occur in the Clear Fork and Wolfcamp Formations. Individual reservoir thicknesses may range up to hundreds of feet; overall porosities average 12 percent and permeabilities average 18 mD. Drilling depths vary from 1,000 to 10,000 ft.
Source rocks: Source rocks include indigenous organic-rich calcareous shale and shaly limestone of Wolfcampian and Leonardian age. Important additional source contributors are the Late Devonian Woodford Shale and organic-rich Pennsylvanian and Permian shales in basins adjacent of the Central Basin Platform. Hydrocarbon generation from adjacent organic-rich source rocks probably occurred during Upper Permian time. Fluids migrated laterally and upward into the present reservoirs.
Timing and migration: The combined stratigraphic/structural traps containing the hydrocarbons of this play were all in existence by the end of Permian Guadalupean time. Mature source rocks were present in the adjacent Delaware, Val Verde, and Midland Basins at this time. It seems likely that these hydrocarbons traveled upward along a combination of faults, unconformities, and permeable stratigraphic horizons into the Permian reservoirs of this play from the time of their inception. Secondary migration into and out of these traps may well continue to the present day.
Traps: Primary trapping mechanisms are generally a combination of structural and stratigraphic features such as anticlinal noses and domes, that are associated with stratigraphic depositional and diagenetic facies changes. Large, simple anticlinal closures also are present. Seals consist of impervious dolomite, shaly carbonate, anhydrite, and other evaporite facies. Structurally and stratigraphically trapped hydrocarbons occur at depths of 1,000-10,000 ft and average 4,500 ft.
Exploration Status: Through 1990, cumulative production from this play was 11.6 BBO, 26.7 TCFG, and 1.7 BBNGL, making the play the most important producer in the Permian Basin Province. The largest oil field, Yates, discovered in 1926, has produced more than 2 BBO. Eunice Area, discovered in 1929, has produced 850 MBO and 8.8 TCFG. Most of the major discoveries in this play occurred prior to 1950.
SW/4 SW/4 Section 17, Block 178, Certificate #1439, T&C RR Co Survey, Pecos County, Texas
1320′ x 1320′
At closing, Buyer will pay a $299 document preparation fee, which includes postage and recording fees.