RIFFE

Operated by BURK ROYALTY CO., LTD. (P-5 108799) in the CECILIA (MARMATON) field. Every figure below is a volume the Railroad Commission published, multiplied by a monthly price you can check.

Oil lease lease 6491District 10Field 16526500NGPA filingOilCasinghead gasSaveExport
Value, all time
$3.1 M
Jan 1993 – May 2026
Value, last 12 filed months
$79 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 8 leases and 9 wells, and the rule below applies to all of them.

Discovered
1987-04-01
as the register files it
Field class
Oil and gas
the register's own label
Between wells
933 ft
minimum
From a lease line
467 ft
minimum

A drilling unit in this field needs at least 40 acres. The field rule took effect on 1989-03-01.

The Commission's schedule remark for this field reads: REVIEW HEARING AUGUST 1990

Severance-tax incentive filings

Applications the operator filed to have this lease's gas taxed at a reduced state rate. A filing is an application, and this page never calls one a reduction that was granted.

ProgrammeFilingsWith an approval dateDatedDocket
NGPA2none

This says nothing about a royalty. A severance tax is charged to the operator. Whether a reduced rate reaches a royalty owner depends on the wording of the lease instrument, which is a private contract this site does not hold.

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
OilDisposition49,416 bbl$2,406,190
Casinghead gasProduction139,096 Mcf$667,422
Total$3,073,612

9,525 Mcf of this lease's gas, across 48 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 (2)

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 36.3169, -101.7421. A lease has no coordinate of its own — that point is the mean of its wells, and they span 0.3 miles.

36.31686, -101.74213 · 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
50.0%
1 of 2 wells
With a plug date
50.0%
1 of 2 wells
Median depth
5,831 ft
2 wells filed one
Completion to plug
no well filed both dates

What the state filed about each well

On the RRC proration schedule
150.0%
A plug date is filed
150.0%
BothOn the schedule and plugged. Neither fact cancels the other.
150.0%
NeitherNo plug date, and not on the schedule.
150.0%

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 5,811 and 5,850 ft, median 5,831 ft, over the 2 wells that filed a depth.

Completions filed
Oct 1987
1 of 2 wells; 1 filed none
Plug dates filed
Apr 1995
1 of 2 wells; 1 filed none

2 wells

42-4213041345,850 ftApr 1995Yes
42-4213039635,811 ftOct 1987

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 202617152898.932.87$18,432
Mar 2026054689.753.15$1,720
Feb 202618049463.503.75$13,283
Jan 202618552259.138.00$15,114
Dec 2025031456.664.41$1,386
Nov 202518761658.593.93$13,375
Oct 2025016559.383.30$545
Sep 2025017562.743.08$538
Aug 2025012163.933.01$365
Jul 2025018266.743.32$603
Jun 202518347066.483.13$13,636
May 2025044260.553.23$1,429
Apr 2025052162.363.54$1,846
Mar 202517952167.704.27$14,342
Feb 2025047170.884.34$2,045
Jan 202518628174.324.28$15,026
Dec 202404968.993.12$153
Nov 2024014369.052.20$314
Oct 20241831071.372.28$13,084
Sep 20240069.612.36$0
Aug 20240075.632.06$0
Jul 2024179079.932.15$14,307
Jun 20240078.082.63$0
May 2024177078.812.20$13,949
Apr 202403684.451.66$60
Mar 2024037280.301.55$575
Feb 202417124776.091.78$13,452
Jan 2024028873.023.30$950
Dec 2023040871.262.61$1,065
Nov 202318149277.892.81$15,479
Oct 2023056885.443.09$1,754
Sep 2023046389.042.74$1,266
Aug 202317756080.522.67$15,749
Jul 2023046574.852.64$1,228
Jun 202317856668.962.26$13,553
May 2023058770.622.23$1,307
Apr 202316947278.122.24$14,259
Mar 202318139872.852.39$14,138
Feb 2023040875.112.47$1,006
Jan 2023039576.533.39$1,338
Dec 2022048876.415.73$2,796
Nov 202218153485.005.65$18,400
Oct 2022058787.185.86$3,442
Sep 2022057784.888.16$4,710
Aug 202218360294.529.13$22,792
Jul 20220599101.587.54$4,518
Jun 2022182574115.097.98$25,525
May 20220584109.378.43$4,925
Apr 2022183568104.226.84$22,956
Mar 20220575108.885.08$2,919
Feb 202218243491.054.86$18,680
Jan 2022055281.844.54$2,505
Dec 202117946071.323.90$14,560
Nov 202118567877.435.24$17,875
Oct 2021010079.795.71$571
Sep 2021010469.865.35$557
Aug 2021024866.024.22$1,047
Jul 202118124770.783.98$13,795
Jun 2021024169.493.38$815
May 202117629663.483.02$12,066
Apr 2021056660.362.76$1,561
Mar 2021056961.302.72$1,546
Feb 202136839457.805.55$23,456
Jan 20213856750.412.81$3,509
Dec 2020057444.642.68$1,536
Nov 2020056838.772.71$1,537
Oct 202017661536.972.48$8,031
Sep 20202026137.091.99$1,261
Aug 202018221639.982.39$7,792
Jul 2020022938.371.83$418
Jun 2020024134.901.69$407
May 202017624916.921.81$3,430
Apr 20202320414.751.80$707
Mar 202018120030.341.86$5,863
Feb 202016318649.881.98$8,499
Jan 2020012457.252.09$260
Dec 201917716759.012.30$10,830
Nov 2019017855.302.75$490
Oct 201922125253.472.42$12,426
Sep 2019027155.052.66$720
Aug 2019178053.112.30$9,454
Jul 2019024456.272.46$600
Jun 201901952.782.49$47
May 201919619758.482.74$12,002
Apr 2019020662.632.75$567
Mar 201917715956.803.06$10,540
Feb 2019018150.852.79$505
Jan 201922817346.033.23$11,053
Dec 2018023646.594.19$988
Nov 2018018952.934.24$801
Oct 201818222861.443.40$11,957
Sep 2018022859.543.11$709
Aug 201818024059.403.07$11,428
Jul 2018024365.142.93$712
Jun 201818823260.183.08$12,028
May 2018024465.382.90$708
Apr 201817823763.842.90$12,051
Mar 201817624661.222.79$11,460
Feb 2018022561.782.77$622
Jan 201817725162.874.01$12,134
Dec 2017025357.272.92$739
Nov 201716023855.423.12$9,609
Oct 2017024749.292.98$737
Sep 201716729947.523.09$8,859
Aug 2017026045.373.00$781
Jul 201714125643.873.09$6,976
Jun 2017021542.493.09$664
May 201717925545.373.26$8,953
Apr 201716526347.933.21$8,753
Mar 2017023246.772.98$692
Feb 201714323050.452.95$7,893
Jan 201716623149.413.42$8,992
Dec 2016025548.763.72$949
Nov 2016029042.492.64$767
Oct 201616722946.193.09$8,421
Sep 2016017141.553.10$530
Aug 201616015141.442.92$7,072
Jul 201615914641.622.92$7,045
Jun 2016017645.352.69$473
May 201615623542.521.99$7,101
Apr 2016028836.561.99$573
Mar 201616830933.011.79$6,100
Feb 2016027126.472.06$559
Jan 201619129727.352.36$5,926
Dec 2015029532.362.00$590
Nov 2015031338.792.17$678
Oct 201516633643.552.43$8,045
Sep 2015029642.992.76$816
Aug 201517524240.162.87$7,723
Jul 2015023448.152.95$689
Jun 201516324956.152.88$9,870
May 201515929455.212.96$9,647
Apr 2015026349.822.71$712
Mar 201517225542.892.93$8,125
Feb 201517422844.662.98$8,449
Jan 2015024643.433.10$763
Dec 201416428654.693.59$9,996
Nov 2014025370.464.25$1,076
Oct 201417225178.303.90$14,447
Sep 201413019686.164.05$11,994
Aug 2014011589.394.04$464
Jul 201417010196.564.18$16,837
Jun 2014013698.164.74$644
May 201412723494.734.73$13,137
Apr 201417826495.944.81$18,347
Mar 201415427295.895.06$16,143
Feb 2014025097.406.19$1,548
Jan 201418129190.404.86$17,777
Dec 2013028291.824.35$1,228
Nov 201311326988.853.74$11,046
Oct 201312527397.423.78$13,209
Sep 2013163217104.113.72$17,777
Aug 2013178216104.253.52$19,317
Jul 20130231102.523.72$859
Jun 201317626294.403.93$17,645
May 201318131194.834.15$18,455
Apr 201317729393.964.28$17,886
Mar 2013030593.623.91$1,193
Feb 201317626291.233.42$16,953
Jan 2013033691.603.42$1,149
Dec 201217430786.773.42$16,148
Nov 2012031386.953.62$1,135
Oct 201216432389.383.40$15,756
Sep 2012027794.672.92$808
Aug 201216923492.662.91$16,340
Jul 201216626685.133.02$14,935
Jun 2012029079.822.52$731
May 201216434491.612.49$15,880
Apr 2012181300101.652.00$18,998
Mar 2012171281105.052.22$18,588
Feb 2012153310101.102.57$16,265
Jan 2012010698.092.73$290
Dec 201118526596.873.24$18,779
Nov 2011028095.723.31$927
Oct 201116034284.983.65$14,845
Sep 2011032083.623.99$1,275
Aug 201117630783.404.15$15,952
Jul 201118535194.144.52$19,001
Jun 2011033692.904.64$1,559
May 201134333298.134.40$35,121
Apr 20110334105.964.33$1,447
Mar 201113333996.364.06$14,191
Feb 201116629385.644.18$15,441
Jan 201117134486.504.59$16,370
Dec 201017337885.734.35$16,475
Nov 201018742080.843.80$16,711
Oct 201016566378.103.51$15,213
Sep 2010023072.633.98$915
Aug 20100073.684.42$0
Jul 20100072.554.74$0
Jun 20100070.364.91$0
May 201019326771.124.24$14,857
Apr 201015442881.694.12$14,345
Mar 201016742878.394.39$14,969
Feb 2010037473.585.44$2,035
Jan 201016140674.365.96$14,393
Dec 200913241271.445.48$11,689
Nov 2009044474.593.75$1,666
Oct 200915747472.544.11$13,337
Sep 200917246865.543.06$12,707
Aug 200912836667.423.22$9,808
Jul 200918249161.133.46$12,827
Jun 200913551066.163.90$10,918
May 200917148954.743.93$11,280
Apr 200914046446.773.59$8,212
Mar 2009048442.144.06$1,965
Feb 200914443532.814.63$6,740
Jan 200916348035.865.37$8,423
Dec 200814850037.105.98$8,479
Nov 200818551355.496.86$13,785
Oct 200811153475.246.92$12,048
Sep 2008178540101.767.88$22,367
Aug 2008194551114.228.48$26,833
Jul 20080307131.0811.39$3,497
Jun 2008154538131.3313.03$27,236
May 20080561123.1711.57$6,493
Apr 2008177557110.3110.45$25,348
Mar 2008157568101.909.66$21,487
Feb 200819652492.538.77$22,732
Jan 200817956690.388.21$20,822
Dec 2007056388.337.30$4,111
Nov 200716955591.677.29$19,539
Oct 200716360982.856.92$17,720
Sep 200717660775.846.24$17,138
Aug 200719665369.066.39$17,707
Jul 200715462870.906.39$14,930
Jun 2007062362.007.55$4,703
May 200719763158.747.85$16,523
Apr 200719760859.617.81$16,489
Mar 200736268956.927.30$25,636
Feb 2007040055.108.22$3,286
Jan 2007051550.306.73$3,464
Dec 200614264356.656.92$12,493
Nov 200621965654.207.62$16,867
Oct 200619064454.906.01$14,304
Sep 2006065460.085.04$3,294
Aug 200618669068.717.34$17,845
Jul 200618670469.376.34$17,368
Jun 200619269566.286.38$17,163
May 200618671666.016.42$16,878
Apr 200620368564.397.36$18,113
Mar 200618070956.707.08$15,228
Feb 2006063657.597.75$4,930
Jan 200635571460.598.93$27,888
Dec 200516671854.9413.42$18,752
Nov 200517765954.6910.59$16,658
Oct 20056755658.3413.80$11,579
Sep 200511677361.4512.08$16,465
Aug 200533081561.519.80$28,283
Jul 200518879855.697.84$16,729
Jun 200519174852.337.38$15,516
May 200519278045.226.65$13,870
Apr 200518981649.207.36$15,305
Mar 200517665950.377.15$13,580
Feb 200519274945.226.31$13,410
Jan 200517784043.166.32$12,950
Dec 200417985539.866.75$12,907
Nov 200418486945.286.33$13,833
Oct 200441495749.706.52$26,811
Sep 200419290043.245.28$13,058
Aug 200419199542.375.55$13,616
Jul 200418898238.286.08$13,171
Jun 200418793336.106.43$12,753
May 20041441,05337.486.49$12,236
Apr 200427196034.475.86$14,965
Mar 20043471,11134.365.53$18,067
Feb 20041851,04032.455.51$11,733
Jan 20041451,13232.036.30$11,776
Dec 20033721,16530.266.30$18,598
Nov 20031791,15828.804.60$10,476
Oct 20031901,23628.174.76$11,235
Sep 20033821,22826.314.75$15,883
Aug 20031911,30229.765.13$12,363
Jul 20033801,31829.415.17$17,991
Jun 20033801,27928.565.98$18,505
May 20035681,38226.595.97$23,357
Apr 20033611,39526.675.41$17,171
Mar 20037361,49431.146.10$32,027
Feb 20035341,57033.487.93$30,322
Jan 20039461,72330.315.58$38,291
Dec 20027531,20026.914.85$26,088
Nov 200215221324.664.14$4,629
Oct 20020026.464.23$0
Sep 20020027.443.64$0
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 20020017.172.38$0
Dec 20010016.932.36$0
Nov 2001194018.072.41$3,506
Oct 20010019.782.53$0
Sep 2001197024.262.25$4,779
Aug 20010024.873.05$0
Jul 2001181023.933.20$4,331
Jun 2001191024.563.82$4,691
May 20010025.524.31$0
Apr 2001198024.685.34$4,887
Mar 2001201024.545.38$4,933
Feb 2001180027.755.77$4,995
Jan 20010027.478.40$0
Dec 2000193026.889.12$5,188
Nov 2000196032.215.66$6,313
Oct 2000195031.235.15$6,090
Sep 2000196031.875.19$6,247
Aug 2000202029.644.54$5,987
Jul 2000183028.534.09$5,221
Jun 2000188029.304.40$5,508
May 2000560027.263.68$15,266
Apr 20000024.513.12$0
Mar 20000028.422.86$0
Feb 20000027.622.73$0
Jan 20000025.272.48$0
Dec 19990024.282.42$0
Nov 19990023.192.43$0
Oct 19990020.982.80$0
Sep 1999137021.752.62$2,980
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 199802309.201.77$408
Nov 199818228910.892.19$2,614
Oct 1998028912.421.97$569
Sep 199818923912.592.08$2,877
Aug 1998023811.301.91$454
Jul 199826330011.742.24$3,759
Jun 199818623511.242.24$2,616
May 1998019712.622.21$435
Apr 199818922013.042.51$3,016
Mar 199818720912.802.31$2,876
Feb 199803613.952.30$83
Jan 199818921914.702.15$3,250
Dec 199718131716.322.41$3,718
Nov 1997019618.193.09$605
Oct 199717929519.253.15$4,375
Sep 199718716617.742.95$3,808
Aug 199701817.862.55$46
Jul 199716724617.582.25$3,489
Jun 199736225117.242.26$6,807
May 1997026318.972.31$607
Apr 199718927317.882.08$3,948
Mar 199719127918.951.94$4,160
Feb 1997024420.492.21$538
Jan 199719326323.483.54$5,463
Dec 199618726123.32$4,361
Nov 199618924721.97$4,152
Oct 199618725523.31$4,359
Sep 1996018922.22$0
Aug 199618719120.26$3,789
Jul 199618720419.55$3,656
Jun 199617411718.73$3,259
May 199618917219.43$3,672
Apr 199619014921.51$4,087
Mar 199618816919.38$3,643
Feb 199654934216.98$9,322
Jan 199602317.07$0
Dec 199503017.19$0
Nov 199513916.00$16
Oct 1995011515.43$0
Sep 199518812816.18$3,042
Aug 199515117415.92$2,404
Jul 199518922515.24$2,880
Jun 199518915616.41$3,101
May 1995019717.56$0
Apr 199533118117.73$5,869
Mar 199519018616.44$3,124
Feb 1995017116.58$0
Jan 199519019715.92$3,025
Dec 199419020115.03$2,856
Nov 199418419915.90$2,926
Oct 199418413915.58$2,867
Sep 199418413015.29$2,813
Aug 1994010716.13$0
Jul 199418720617.56$3,284
Jun 199418518817.09$3,162
May 199419219215.88$3,049
Apr 199417722114.14$2,503
Mar 199419422012.46$2,417
Feb 199418719512.50$2,338
Jan 1994026212.66$0
Dec 199319026312.33$2,343
Nov 199319217414.49$2,782
Oct 199319217915.85$3,043
Sep 199318630215.03$2,796
Aug 199315426515.66$2,412
Jul 19933781,33615.46$5,844
Jun 19931874916.79$3,140
May 199301717.68$0
Apr 199307418.05$0
Mar 199318716818.14$3,392
Feb 1993014717.90$0
Jan 199319517316.93$3,301

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                  171 bbl  × $ 98.93 =    $16,917
Casinghead gas       528 Mcf  × $  2.87 =     $1,515

────────────────────────────────────────────────────
Month total                                  $18,432

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. 10/O/6491 is the state's own key, not one this site invented.