TARZAN UNIT 1
Operated by XTO ENERGY INC. (P-5 945936) in the SPRABERRY (TREND AREA) field. Every figure below is a volume the Railroad Commission published, multiplied by a monthly price you can check.
The Railroad Commission's own record for the field this lease produces from, including the spacing rule that governs how close together its wells may be drilled.
These are facts about the field, not about this lease. The field holds 16,587 leases and 43,997 wells, and the rule below applies to all of them.
A drilling unit in this field needs at least 80 acres. The field rule took effect on 2018-02-13.
The Commission's schedule remark for this field reads: “SPRABERRY (TREND AREA) FIELD EFFECTIVE 10/1/2019.”
What this lease produced, and what it was worth
Oil and condensate are valued on the volume the state records as disposed of; gas and casinghead gas on the volume produced. They are different columns of different files, and the difference is not cosmetic.
| Stream | Basis | Volume | Value |
|---|---|---|---|
| Oil | Disposition | 1,918,340 bbl | $130,283,649 |
| Casinghead gas | Production | 3,405,866 Mcf | $12,711,529 |
| Total | $142,995,178 | ||
Wells on this lease (9)
Every wellbore the Railroad Commission records against this lease key, with the depth, the last completion and the plug date exactly as filed. A well with no plug date is not stated to be producing — the state files no such flag.
These wells centre on 32.3443, -101.8322. A lease has no coordinate of its own — that point is the mean of its wells, and they span 0.4 miles.
What these wells add up to
Every figure below is counted over all of this lease's wells, not over the rows listed above. The Railroad Commission files two facts about a well's state — a plug date and a proration-schedule flag — and a well can carry both, so they are published as separate counts and never merged into a status.
What the state filed about each well
A plug date is the date the Commission recorded the wellbore as sealed with cement and abandoned. It is the only end-of-life fact Texas files. There is no "active" flag on a well, so this page does not print one — a well with no plug date is not stated to be producing.
How deep they were drilled
Total depth in feet, 9 of 9 wells. Median 8,649 ft, with the middle half between 8,156 and 9,106 ft; the shallowest is 8,124 ft and the deepest 10,240 ft. The median is published rather than the mean, because a single mis-keyed depth moves a mean and cannot move a median.
When they were last completed
Last completion by decade, 9 of 9 wells, Sep 2024 – Apr 2025. This is the LAST completion filed on each wellbore, not the first — a well recompleted in 2019 counts once, in the 2010s.
9 wells
| 42-31745511 | 2081NH | 10,176 ft | Apr 2025 | — | — |
| 42-31745502 | 2084NH | 10,240 ft | Mar 2025 | — | — |
| 42-31745512 | 2071JH | 8,156 ft | Dec 2024 | — | — |
| 42-31745510 | 2061DH | 8,658 ft | Dec 2024 | — | — |
| 42-31745508 | 2002BH | 9,106 ft | Dec 2024 | — | — |
| 42-31745507 | 2063DH | 8,649 ft | Oct 2024 | — | — |
| 42-31745504 | 2074JH | 8,134 ft | Oct 2024 | — | — |
| 42-31745500 | 2064DH | 8,633 ft | Oct 2024 | — | — |
| 42-31745509 | 2072JH | 8,124 ft | Sep 2024 | — | — |
The API number is the state's, prefixed 42 for Texas. A well is matched to this lease by the lease key the Commission files on the wellbore record, so a well that has moved between leases appears under each one it was filed against.
Every month this lease reported (27)
Volume × price = value, one row per cycle. The price columns are the same series published on the prices page — nothing here is modelled.
27 months
| May 2026 | 53,146 | 176,543 | 106.41 | 3.05 | $6,192,988 |
| Apr 2026 | 58,489 | 193,552 | 98.93 | 2.87 | $6,341,757 |
| Mar 2026 | 69,987 | 233,841 | 89.75 | 3.15 | $7,017,801 |
| Feb 2026 | 70,054 | 175,567 | 63.50 | 3.75 | $5,106,861 |
| Jan 2026 | 81,606 | 209,769 | 59.13 | 8.00 | $6,503,078 |
| Dec 2025 | 95,038 | 214,212 | 56.66 | 4.41 | $6,330,248 |
| Nov 2025 | 95,970 | 174,581 | 58.59 | 3.93 | $6,308,364 |
| Oct 2025 | 52,130 | 108,397 | 59.38 | 3.30 | $3,453,714 |
| Sep 2025 | 100,457 | 212,744 | 62.74 | 3.08 | $6,957,268 |
| Aug 2025 | 110,887 | 226,945 | 63.93 | 3.01 | $7,773,191 |
| Jul 2025 | 126,043 | 230,399 | 66.74 | 3.32 | $9,175,929 |
| Jun 2025 | 135,885 | 233,930 | 66.48 | 3.13 | $9,765,536 |
| May 2025 | 160,888 | 239,562 | 60.55 | 3.23 | $10,516,109 |
| Apr 2025 | 155,351 | 212,710 | 62.36 | 3.54 | $10,441,345 |
| Mar 2025 | 137,440 | 153,392 | 67.70 | 4.27 | $9,959,414 |
| Feb 2025 | 128,864 | 133,683 | 70.88 | 4.34 | $9,714,177 |
| Jan 2025 | 133,558 | 131,651 | 74.32 | 4.28 | $10,489,323 |
| Dec 2024 | 89,086 | 84,000 | 68.99 | 3.12 | $6,408,238 |
| Nov 2024 | 53,020 | 49,895 | 69.05 | 2.20 | $3,770,722 |
| Oct 2024 | 10,441 | 10,493 | 71.37 | 2.28 | $769,113 |
| Sep 2024 | 0 | 0 | 69.61 | 2.36 | $0 |
| Aug 2024 | 0 | 0 | 75.63 | 2.06 | $0 |
| Jul 2024 | 0 | 0 | 79.93 | 2.15 | $0 |
| Jun 2024 | 0 | 0 | 78.08 | 2.63 | $0 |
| May 2024 | 0 | 0 | 78.81 | 2.20 | $0 |
| Apr 2024 | 0 | 0 | 84.45 | 1.66 | $0 |
| Mar 2024 | 0 | 0 | 80.30 | 1.55 | $0 |
How to read this page
The arithmetic is one multiplication per stream per month. Here it is, worked, on a real row from the table above.
Oil 53,146 bbl × $106.41 = $5,655,266 Casinghead gas 176,543 Mcf × $ 3.05 = $537,722 ──────────────────────────────────────────────────── Month total $6,192,988
The volumes are the state's, unchanged
Every barrel and every Mcf on this page is a number the Railroad Commission of Texas published in its monthly production query. Nothing is modelled, estimated or filled in.
The dollars are a multiplication, not a valuation
Volume × a published monthly price. It is not what the operator was paid: it takes no account of a contract, a differential, a transportation deduction, or the share any one owner holds.
Oil and gas are priced differently
Oil is a Texas realisation — the crude oil first purchase price. Gas is a benchmark, because no free Texas wellhead gas series exists at any date. The prices page publishes the difference rather than correcting it away.
A lease is not a well
The state reports oil on lease and gas on well, and this page is the lease grain. 08/O/61351 is the state's own key, not one this site invented.