SUN MARK EXPLORATION

Operated by CASTILLO OIL COMPANY LLC (P-5 139634) in the SALT FLAT, WEST field. Every figure below is a volume the Railroad Commission published, multiplied by a monthly price you can check.

Oil lease lease 7875District 01Field 79912100Hydrogen sulphide fieldOilCasinghead gasSaveExport
Value, all time
$1.3 M
Jan 1993 – May 2026
Value, last 12 filed months
$26 k
at the published price for each month
Months reported
401
no gaps in the span
Streams
2
oil, casinghead gas

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 141 leases and 399 wells, and the rule below applies to all of them.

Discovered
1981-03-01
as the register files it
Field class
Oil
the register's own label
Between wells
300 ft
minimum
From a lease line
150 ft
minimum

A drilling unit in this field needs at least 2.06 acres.

The register flags this field for hydrogen sulphide. That is a poisonous gas that occurs naturally in some formations. The flag is a property of the field as the Commission records it. It is not a measurement taken at this lease, and it is not a statement that gas is escaping anywhere.

The Commission's schedule remark for this field reads: 2.06 OP ACRES - 500' DIAG

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.

StreamBasisVolumeValue
OilDisposition21,013 bbl$1,191,751
Casinghead gasProduction24,552 Mcf$70,468
Total$1,262,218

8,281 Mcf of this lease's gas, across 47 months, carries no value here. No free Texas wellhead gas price exists before 1997, so those months are left out of the total rather than valued at zero. The total above is therefore a floor, not an estimate.

Wells on this lease (6)

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 29.7064, -97.6579. A lease has no coordinate of its own — that point is the mean of its wells, and they span 0.3 miles.

29.70623, -97.65778 · centre of the wells drawn, derived

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.

On the schedule
33.3%
2 of 6 wells
With a plug date
0.0%
0 of 6 wells
Median depth
2,688 ft
6 wells filed one
Completion to plug
no well filed both dates

What the state filed about each well

On the RRC proration schedule
233.3%
A plug date is filed
00.0%
BothOn the schedule and plugged. Neither fact cancels the other.
00.0%
NeitherNo plug date, and not on the schedule.
466.7%

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

Between 2,670 and 2,715 ft, median 2,688 ft, over the 6 wells that filed a depth.

Completions filed
Nov 1981 – Feb 1982
6 of 6 wells

6 wells

42-055322682C2,710 ftFeb 1982
42-055322691C2,715 ftFeb 1982
42-055322702B2,685 ftJan 1982
42-055322711B2,690 ftJan 1982
42-0553227222,680 ftNov 1981Yes
42-0553227312,670 ftNov 1981Yes

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 (401)

Volume × price = value, one row per cycle. The price columns are the same series published on the prices page — nothing here is modelled.

401 months

May 202600106.413.05$0
Apr 2026160098.932.87$15,829
Mar 20260089.753.15$0
Feb 20260063.503.75$0
Jan 20260059.138.00$0
Dec 20250056.664.41$0
Nov 20250058.593.93$0
Oct 20250059.383.30$0
Sep 2025162062.743.08$10,164
Aug 20250063.933.01$0
Jul 20250066.743.32$0
Jun 20250066.483.13$0
May 20250060.553.23$0
Apr 2025174062.363.54$10,851
Mar 20250067.704.27$0
Feb 20250070.884.34$0
Jan 20250074.324.28$0
Dec 20240068.993.12$0
Nov 2024161069.052.20$11,117
Oct 20240071.372.28$0
Sep 20240069.612.36$0
Aug 20240075.632.06$0
Jul 20240079.932.15$0
Jun 2024174078.082.63$13,586
May 20240078.812.20$0
Apr 20240084.451.66$0
Mar 20240080.301.55$0
Feb 2024171076.091.78$13,011
Jan 20240073.023.30$0
Dec 20230071.262.61$0
Nov 2023172077.892.81$13,397
Oct 20230085.443.09$0
Sep 20230089.042.74$0
Aug 20230080.522.67$0
Jul 20230074.852.64$0
Jun 20230068.962.26$0
May 20230070.622.23$0
Apr 2023170078.122.24$13,280
Mar 20230072.852.39$0
Feb 20230075.112.47$0
Jan 20230076.533.39$0
Dec 20220076.415.73$0
Nov 2022130085.005.65$11,050
Oct 20220087.185.86$0
Sep 202289084.888.16$7,554
Aug 20220094.529.13$0
Jul 20221370101.587.54$13,916
Jun 202200115.097.98$0
May 202200109.378.43$0
Apr 20221610104.226.84$16,779
Mar 202200108.885.08$0
Feb 2022170091.054.86$15,479
Jan 20220081.844.54$0
Dec 20210071.323.90$0
Nov 20210077.435.24$0
Oct 20210079.795.71$0
Sep 20210069.865.35$0
Aug 20210066.024.22$0
Jul 202199070.783.98$7,007
Jun 20210069.493.38$0
May 20210063.483.02$0
Apr 20210060.362.76$0
Mar 20210061.302.72$0
Feb 20210057.805.55$0
Jan 20210050.412.81$0
Dec 20200044.642.68$0
Nov 20200038.772.71$0
Oct 20200036.972.48$0
Sep 20200037.091.99$0
Aug 2020168039.982.39$6,717
Jul 20200038.371.83$0
Jun 20200034.901.69$0
May 20200016.921.81$0
Apr 20200014.751.80$0
Mar 20200030.341.86$0
Feb 20200049.881.98$0
Jan 20200057.252.09$0
Dec 20190059.012.30$0
Nov 20190055.302.75$0
Oct 20190053.472.42$0
Sep 20190055.052.66$0
Aug 20190053.112.30$0
Jul 20190056.272.46$0
Jun 20190052.782.49$0
May 20190058.482.74$0
Apr 20190062.632.75$0
Mar 20190056.803.06$0
Feb 20190050.852.79$0
Jan 2019162046.033.23$7,457
Dec 20180046.594.19$0
Nov 20180052.934.24$0
Oct 20180061.443.40$0
Sep 20180059.543.11$0
Aug 20180059.403.07$0
Jul 20180065.142.93$0
Jun 20180060.183.08$0
May 2018168065.382.90$10,984
Apr 20180063.842.90$0
Mar 20180061.222.79$0
Feb 20180061.782.77$0
Jan 20180062.874.01$0
Dec 20170057.272.92$0
Nov 20170055.423.12$0
Oct 20170049.292.98$0
Sep 20170047.523.09$0
Aug 2017163045.373.00$7,395
Jul 20170043.873.09$0
Jun 20170042.493.09$0
May 20170045.373.26$0
Apr 20170047.933.21$0
Mar 201716310246.772.98$7,928
Feb 20170550.452.95$15
Jan 20170049.413.42$0
Dec 20160048.763.72$0
Nov 20160042.492.64$0
Oct 20160046.193.09$0
Sep 20160041.553.10$0
Aug 201617310741.442.92$7,482
Jul 2016010141.622.92$295
Jun 20160045.352.69$0
May 2016010442.521.99$207
Apr 2016012136.561.99$241
Mar 20161668833.011.79$5,638
Feb 2016010026.472.06$206
Jan 2016012027.352.36$284
Dec 201508632.362.00$172
Nov 201507638.792.17$165
Oct 20151639243.552.43$7,322
Sep 201506342.992.76$174
Aug 2015011840.162.87$339
Jul 2015018448.152.95$542
Jun 201503356.152.88$95
May 201516311755.212.96$9,345
Apr 2015020049.822.71$541
Mar 2015020842.892.93$610
Feb 2015016744.662.98$497
Jan 201516513343.433.10$7,578
Dec 2014010754.693.59$384
Nov 2014012370.464.25$523
Oct 2014166078.303.90$12,998
Sep 2014011786.164.05$473
Aug 2014011589.394.04$464
Jul 201416610296.564.18$16,455
Jun 2014010098.164.74$474
May 201409994.734.73$468
Apr 2014012595.944.81$601
Mar 201416712395.895.06$16,636
Feb 2014013997.406.19$861
Jan 2014011390.404.86$549
Dec 201317114191.824.35$16,315
Nov 2013012588.853.74$467
Oct 2013011597.423.78$435
Sep 2013167160104.113.72$17,981
Aug 20130128104.253.52$451
Jul 20130116102.523.72$431
Jun 20131638194.403.93$15,706
May 201309694.834.15$398
Apr 201307493.964.28$317
Mar 20131635293.623.91$15,464
Feb 2013014291.233.42$486
Jan 201317114391.603.42$16,153
Dec 2012015286.773.42$520
Nov 2012016486.953.62$594
Oct 201216614689.383.40$15,333
Sep 2012017294.672.92$502
Aug 2012019492.662.91$564
Jul 201217013985.133.02$14,892
Jun 2012011079.822.52$277
May 201217212791.612.49$16,073
Apr 20120139101.652.00$278
Mar 2012167145105.052.22$17,866
Feb 20120168101.102.57$432
Jan 201217115398.092.73$17,192
Dec 2011019796.873.24$638
Nov 2011010895.723.31$358
Oct 201117019084.983.65$15,140
Sep 2011025683.623.99$1,020
Aug 2011023783.404.15$983
Jul 201116720794.144.52$16,656
Jun 2011018092.904.64$835
May 2011163098.134.40$15,995
Apr 20110414105.964.33$1,794
Mar 20111611396.364.06$15,567
Feb 201102185.644.18$88
Jan 2011165586.504.59$14,295
Dec 201001885.734.35$78
Nov 20101652080.843.80$13,415
Oct 201008478.103.51$295
Sep 2010165772.633.98$12,012
Aug 2010013973.684.42$614
Jul 201016620172.554.74$12,995
Jun 2010023370.364.91$1,144
May 201016620571.124.24$12,674
Apr 201016413881.694.12$13,966
Mar 201016413978.394.39$13,466
Feb 2010011273.585.44$610
Jan 201016510874.365.96$12,914
Dec 200916714471.445.48$12,720
Nov 2009021774.593.75$814
Oct 200916519072.544.11$12,750
Sep 200916422465.543.06$11,435
Aug 200916618367.423.22$11,781
Jul 2009020761.133.46$717
Jun 200916518666.163.90$11,641
May 2009021454.743.93$840
Apr 200915818346.773.59$8,046
Mar 200916615942.144.06$7,641
Feb 2009015732.814.63$727
Jan 200916316435.865.37$6,726
Dec 200816514837.105.98$7,006
Nov 200816519855.496.86$10,514
Oct 2008021875.246.92$1,509
Sep 2008162160101.767.88$17,745
Aug 2008161215114.228.48$20,213
Jul 2008163256131.0811.39$24,282
Jun 200800131.3313.03$0
May 2008167290123.1711.57$23,926
Apr 2008166283110.3110.45$21,270
Mar 2008166254101.909.66$19,370
Feb 200816619792.538.77$17,088
Jan 2008165090.388.21$14,913
Dec 200732816388.337.30$30,162
Nov 2007272091.677.29$24,934
Oct 20070082.856.92$0
Sep 2007154075.846.24$11,679
Aug 20070069.066.39$0
Jul 20070070.906.39$0
Jun 20070062.007.55$0
May 2007165058.747.85$9,692
Apr 20070059.617.81$0
Mar 20070056.927.30$0
Feb 20070055.108.22$0
Jan 20070050.306.73$0
Dec 200664056.656.92$3,626
Nov 2006134054.207.62$7,263
Oct 200636054.906.01$1,976
Sep 20060060.085.04$0
Aug 20060068.717.34$0
Jul 2006173069.376.34$12,001
Jun 20060066.286.38$0
May 20060066.016.42$0
Apr 20060064.397.36$0
Mar 2006165056.707.08$9,356
Feb 20060057.597.75$0
Jan 20060060.598.93$0
Dec 200581054.9413.42$4,450
Nov 200539054.6910.59$2,133
Oct 200571058.3413.80$4,142
Sep 20050061.4512.08$0
Aug 2005155061.519.80$9,534
Jul 20050055.697.84$0
Jun 200545052.337.38$2,355
May 200554045.226.65$2,442
Apr 2005122049.207.36$6,002
Mar 200559050.377.15$2,972
Feb 200546045.226.31$2,080
Jan 20050043.166.32$0
Dec 2004101039.866.75$4,026
Nov 20040045.286.33$0
Oct 2004110049.706.52$5,467
Sep 20040043.245.28$0
Aug 2004171042.375.55$7,245
Jul 20040038.286.08$0
Jun 2004168036.106.43$6,065
May 20040037.486.49$0
Apr 2004168034.475.86$5,791
Mar 20040034.365.53$0
Feb 20040032.455.51$0
Jan 2004180032.036.30$5,765
Dec 2003169030.266.30$5,114
Nov 20030028.804.60$0
Oct 20030028.174.76$0
Sep 2003180026.314.75$4,736
Aug 20030029.765.13$0
Jul 2003175029.415.17$5,147
Jun 20030028.565.98$0
May 2003162026.595.97$4,308
Apr 2003169026.675.41$4,507
Mar 20030031.146.10$0
Feb 20030033.487.93$0
Jan 2003153030.315.58$4,637
Dec 2002151026.914.85$4,063
Nov 20020024.664.14$0
Oct 200262026.464.23$1,641
Sep 2002133027.443.64$3,650
Aug 20020025.963.16$0
Jul 20020024.583.06$0
Jun 20020023.733.34$0
May 20020024.663.58$0
Apr 20020023.653.51$0
Mar 20020022.003.10$0
Feb 20020018.222.38$0
Jan 200293017.172.38$1,597
Dec 2001119016.932.36$2,015
Nov 20010018.072.41$0
Oct 200170019.782.53$1,385
Sep 20010024.262.25$0
Aug 20010024.873.05$0
Jul 20010023.933.20$0
Jun 2001133024.563.82$3,266
May 20010025.524.31$0
Apr 2001157024.685.34$3,875
Mar 200187024.545.38$2,135
Feb 2001126027.755.77$3,497
Jan 2001115027.478.40$3,159
Dec 200082026.889.12$2,204
Nov 2000313032.215.66$10,082
Oct 200043031.235.15$1,343
Sep 2000146031.875.19$4,653
Aug 20000129.644.54$5
Jul 2000107128.534.09$3,057
Jun 2000273129.304.40$8,003
May 2000103127.263.68$2,811
Apr 2000222124.513.12$5,444
Mar 2000146128.422.86$4,152
Feb 20000127.622.73$3
Jan 2000156125.272.48$3,945
Dec 1999100324.282.42$2,435
Nov 1999343523.192.43$7,966
Oct 19990520.982.80$14
Sep 199901121.752.62$29
Aug 19990019.262.88$0
Jul 19990017.892.37$0
Jun 19990015.942.36$0
May 19990015.792.32$0
Apr 19990015.102.21$0
Mar 19990012.471.84$0
Feb 1999009.981.82$0
Jan 19990010.381.90$0
Dec 19980309.201.77$53
Nov 199806010.892.19$131
Oct 199806412.421.97$126
Sep 199807912.592.08$165
Aug 199807911.301.91$151
Jul 199807911.742.24$177
Jun 199807911.242.24$177
May 199807912.622.21$174
Apr 199807913.042.51$198
Mar 199807912.802.31$182
Feb 199807913.952.30$182
Jan 19980014.702.15$0
Dec 19970116.322.41$2
Nov 199707918.193.09$244
Oct 199707919.253.15$249
Sep 199707917.742.95$233
Aug 199707917.862.55$202
Jul 199707917.582.25$178
Jun 199707917.242.26$178
May 199706318.972.31$145
Apr 199706317.882.08$131
Mar 1997937918.951.94$1,916
Feb 1997011620.492.21$256
Jan 199704523.483.54$159
Dec 199604723.32$0
Nov 1996377921.97$813
Oct 1996427923.31$979
Sep 199607922.22$0
Aug 199607920.26$0
Jul 19961207319.55$2,346
Jun 19960018.73$0
May 1996697819.43$1,341
Apr 1996487321.51$1,032
Mar 1996696119.38$1,337
Feb 19961344216.98$2,275
Jan 199605117.07$0
Dec 19950317.19$0
Nov 199501016.00$0
Oct 199501715.43$0
Sep 1995603916.18$971
Aug 19957211115.92$1,146
Jul 19959612115.24$1,463
Jun 199518011016.41$2,954
May 199509617.56$0
Apr 1995428017.73$745
Mar 199507416.44$0
Feb 199508616.58$0
Jan 1995012015.92$0
Dec 19940315.03$0
Nov 19940415.90$0
Oct 199410210415.58$1,589
Sep 1994010115.29$0
Aug 1994022816.13$0
Jul 19948619717.56$1,510
Jun 1994025317.09$0
May 19945919815.88$937
Apr 1994018414.14$0
Mar 1994928512.46$1,146
Feb 1994012612.50$0
Jan 199413033712.66$1,646
Dec 1993050012.33$0
Nov 199321115814.49$3,057
Oct 1993026515.85$0
Sep 199316353815.03$2,450
Aug 199316553815.66$2,584
Jul 199316951715.46$2,613
Jun 1993059716.79$0
May 199317533917.68$3,094
Apr 1993023718.05$0
Mar 199317837618.14$3,229
Feb 1993039917.90$0
Jan 199316738916.93$2,827

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.

Apr 2026 — as filed, then multipliedworked
Oil                  160 bbl  × $ 98.93 =    $15,829
Casinghead gas         0 Mcf  × $  2.87 =         $0

────────────────────────────────────────────────────
Month total                                  $15,829

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. 01/O/7875 is the state's own key, not one this site invented.