ZEMANEK-WOLF UNIT

Name: ZEMANEK-WOLF UNIT lease production and value, Jan 1993 onwards
Creator: Railroad Commission of Texas
License: https://www.rrc.texas.gov/site-policies/

Operated by APACHE CORPORATION (P-5 27200) in the GIDDINGS (AUSTIN CHALK-3) field. Every figure below is a volume the Railroad Commission published, multiplied by a monthly price you can check.

Oil lease lease 21635District 03Field 34733500OilCasinghead gasSave Export

Value, all time

$1.0 M

Jan 1993 – Jul 2009

Value, last 12 filed months

$2 k

at the published price for each month

Months reported

199

no gaps in the span

Streams

oil, casinghead gas

The GIDDINGS (AUSTIN CHALK-3) field

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 5,900 leases and 6,985 wells, and the rule below applies to all of them.

Discovered

1960-10-29

as the register files it

Field class

Oil and gas

the register's own label

Between wells

0 ft

minimum

From a lease line

330 ft

minimum

A drilling unit in this field needs at least 80 acres. The field rule took effect on 2025-09-30.

The Commission's schedule remark for this field reads: “DKT OG-25-00028011: UFT FIELD, ALLOCATION FORMULA SUSPENDED”

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	37,629 bbl	$762,316
Casinghead gas	Production	127,053 Mcf	$238,727
Total			$1,001,043

79,512 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 (1)

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 30.6771, -96.4820. A lease has no coordinate of its own — that point is the mean of its wells, and they span 0.0 miles.

30.67711, -96.48203 · centre of the wells drawn, derived⌘ or Ctrl + scroll to zoom

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

100.0%

1 of 1 wells

With a plug date

100.0%

1 of 1 wells

Median depth

10,131 ft

1 wells filed one

Completion to plug

16.8 years

median over 1 well

What the state filed about each well

On the RRC proration schedule

1100.0%

A plug date is filed

1100.0%

BothOn the schedule and plugged. Neither fact cancels the other.

1100.0%

NeitherNo plug date, and not on the schedule.

00.0%

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

The one well that filed a depth was drilled to 10,131 ft.

Completions filed

Jun 1992

1 of 1 wells

Plug dates filed

Apr 2009

1 of 1 wells

Last completion to plug: a median of 16.8 years across the 1 well that filed both dates, with the middle half between 16.8 years and 16.8 years. The gap is the distance between two filed dates. It is not a statement of how long the well produced.

1 well


42-04131421	1H	10,131 ft	Jun 1992	Apr 2009	Yes

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 (199)

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

199 months


Jul 2009	0	0	61.13	3.46	$0
Jun 2009	0	0	66.16	3.90	$0
May 2009	0	0	54.74	3.93	$0
Apr 2009	0	0	46.77	3.59	$0
Mar 2009	0	0	42.14	4.06	$0
Feb 2009	52	0	32.81	4.63	$1,706
Jan 2009	0	0	35.86	5.37	$0
Dec 2008	0	0	37.10	5.98	$0
Nov 2008	0	0	55.49	6.86	$0
Oct 2008	0	0	75.24	6.92	$0
Sep 2008	0	0	101.76	7.88	$0
Aug 2008	0	0	114.22	8.48	$0
Jul 2008	0	0	131.08	11.39	$0
Jun 2008	0	0	131.33	13.03	$0
May 2008	0	0	123.17	11.57	$0
Apr 2008	0	0	110.31	10.45	$0
Mar 2008	0	0	101.90	9.66	$0
Feb 2008	0	0	92.53	8.77	$0
Jan 2008	173	0	90.38	8.21	$15,636
Dec 2007	0	303	88.33	7.30	$2,213
Nov 2007	0	68	91.67	7.29	$496
Oct 2007	0	175	82.85	6.92	$1,211
Sep 2007	0	2	75.84	6.24	$12
Aug 2007	0	0	69.06	6.39	$0
Jul 2007	0	0	70.90	6.39	$0
Jun 2007	0	0	62.00	7.55	$0
May 2007	0	49	58.74	7.85	$384
Apr 2007	175	69	59.61	7.81	$10,970
Mar 2007	0	96	56.92	7.30	$701
Feb 2007	0	57	55.10	8.22	$468
Jan 2007	0	70	50.30	6.73	$471
Dec 2006	0	52	56.65	6.92	$360
Nov 2006	0	86	54.20	7.62	$655
Oct 2006	160	62	54.90	6.01	$9,157
Sep 2006	0	61	60.08	5.04	$307
Aug 2006	0	68	68.71	7.34	$499
Jul 2006	0	103	69.37	6.34	$653
Jun 2006	155	197	66.28	6.38	$11,531
May 2006	0	63	66.01	6.42	$405
Apr 2006	0	518	64.39	7.36	$3,813
Mar 2006	0	208	56.70	7.08	$1,473
Feb 2006	0	48	57.59	7.75	$372
Jan 2006	0	119	60.59	8.93	$1,063
Dec 2005	186	439	54.94	13.42	$16,108
Nov 2005	0	805	54.69	10.59	$8,524
Oct 2005	0	1,397	58.34	13.80	$19,273
Sep 2005	173	1,169	61.45	12.08	$24,751
Aug 2005	185	1,074	61.51	9.80	$21,901
Jul 2005	0	188	55.69	7.84	$1,475
Jun 2005	0	154	52.33	7.38	$1,137
May 2005	139	58	45.22	6.65	$6,671
Apr 2005	0	4	49.20	7.36	$29
Mar 2005	0	11	50.37	7.15	$79
Feb 2005	0	3	45.22	6.31	$19
Jan 2005	166	295	43.16	6.32	$9,030
Dec 2004	0	170	39.86	6.75	$1,148
Nov 2004	0	308	45.28	6.33	$1,950
Oct 2004	179	377	49.70	6.52	$11,352
Sep 2004	0	468	43.24	5.28	$2,473
Aug 2004	167	484	42.37	5.55	$9,762
Jul 2004	0	535	38.28	6.08	$3,255
Jun 2004	184	454	36.10	6.43	$9,563
May 2004	184	0	37.48	6.49	$6,896
Apr 2004	184	684	34.47	5.86	$10,350
Mar 2004	0	494	34.36	5.53	$2,732
Feb 2004	0	291	32.45	5.51	$1,603
Jan 2004	0	166	32.03	6.30	$1,046
Dec 2003	105	359	30.26	6.30	$5,440
Nov 2003	0	361	28.80	4.60	$1,659
Oct 2003	180	428	28.17	4.76	$7,108
Sep 2003	0	421	26.31	4.75	$1,999
Aug 2003	0	532	29.76	5.13	$2,729
Jul 2003	152	469	29.41	5.17	$6,895
Jun 2003	65	480	28.56	5.98	$4,728
May 2003	188	455	26.59	5.97	$7,716
Apr 2003	0	424	26.67	5.41	$2,293
Mar 2003	178	414	31.14	6.10	$8,067
Feb 2003	1	367	33.48	7.93	$2,942
Jan 2003	187	488	30.31	5.58	$8,392
Dec 2002	105	563	26.91	4.85	$5,558
Nov 2002	189	371	24.66	4.14	$6,196
Oct 2002	0	417	26.46	4.23	$1,764
Sep 2002	137	462	27.44	3.64	$5,439
Aug 2002	164	462	25.96	3.16	$5,719
Jul 2002	178	513	24.58	3.06	$5,946
Jun 2002	185	484	23.73	3.34	$6,006
May 2002	1	579	24.66	3.58	$2,100
Apr 2002	178	530	23.65	3.51	$6,071
Mar 2002	182	460	22.00	3.10	$5,431
Feb 2002	181	498	18.22	2.38	$4,481
Jan 2002	0	564	17.17	2.38	$1,340
Dec 2001	86	525	16.93	2.36	$2,697
Nov 2001	182	536	18.07	2.41	$4,578
Oct 2001	0	600	19.78	2.53	$1,517
Sep 2001	178	743	24.26	2.25	$5,991
Aug 2001	0	634	24.87	3.05	$1,936
Jul 2001	165	740	23.93	3.20	$6,314
Jun 2001	180	764	24.56	3.82	$7,342
May 2001	0	794	25.52	4.31	$3,420
Apr 2001	183	691	24.68	5.34	$8,203
Mar 2001	0	204	24.54	5.38	$1,097
Feb 2001	147	490	27.75	5.77	$6,905
Jan 2001	175	572	27.47	8.40	$9,611
Dec 2000	3	558	26.88	9.12	$5,171
Nov 2000	177	798	32.21	5.66	$10,216
Oct 2000	353	791	31.23	5.15	$15,094
Sep 2000	0	0	31.87	5.19	$0
Aug 2000	0	8	29.64	4.54	$36
Jul 2000	0	264	28.53	4.09	$1,080
Jun 2000	0	1,079	29.30	4.40	$4,745
May 2000	178	1,229	27.26	3.68	$9,375
Apr 2000	359	1,108	24.51	3.12	$12,252
Mar 2000	179	460	28.42	2.86	$6,403
Feb 2000	0	131	27.62	2.73	$357
Jan 2000	0	367	25.27	2.48	$910
Dec 1999	180	175	24.28	2.42	$4,795
Nov 1999	0	200	23.19	2.43	$487
Oct 1999	0	319	20.98	2.80	$894
Sep 1999	178	258	21.75	2.62	$4,547
Aug 1999	0	212	19.26	2.88	$610
Jul 1999	0	214	17.89	2.37	$508
Jun 1999	184	222	15.94	2.36	$3,457
May 1999	0	260	15.79	2.32	$603
Apr 1999	179	223	15.10	2.21	$3,195
Mar 1999	0	296	12.47	1.84	$544
Feb 1999	0	293	9.98	1.82	$533
Jan 1999	180	327	10.38	1.90	$2,490
Dec 1998	0	284	9.20	1.77	$504
Nov 1998	177	259	10.89	2.19	$2,494
Oct 1998	182	245	12.42	1.97	$2,743
Sep 1998	0	181	12.59	2.08	$377
Aug 1998	177	220	11.30	1.91	$2,420
Jul 1998	0	205	11.74	2.24	$459
Jun 1998	177	169	11.24	2.24	$2,368
May 1998	0	225	12.62	2.21	$496
Apr 1998	0	243	13.04	2.51	$609
Mar 1998	0	189	12.80	2.31	$436
Feb 1998	179	186	13.95	2.30	$2,925
Jan 1998	0	251	14.70	2.15	$541
Dec 1997	185	217	16.32	2.41	$3,542
Nov 1997	0	216	18.19	3.09	$667
Oct 1997	180	205	19.25	3.15	$4,111
Sep 1997	0	281	17.74	2.95	$830
Aug 1997	181	242	17.86	2.55	$3,851
Jul 1997	0	251	17.58	2.25	$564
Jun 1997	354	323	17.24	2.26	$6,832
May 1997	0	351	18.97	2.31	$810
Apr 1997	0	350	17.88	2.08	$729
Mar 1997	184	642	18.95	1.94	$4,732
Feb 1997	190	594	20.49	2.21	$5,203
Jan 1997	195	524	23.48	3.54	$6,433
Dec 1996	0	550	23.32	—	$0
Nov 1996	181	595	21.97	—	$3,977
Oct 1996	197	601	23.31	—	$4,592
Sep 1996	186	615	22.22	—	$4,133
Aug 1996	189	647	20.26	—	$3,829
Jul 1996	0	660	19.55	—	$0
Jun 1996	183	629	18.73	—	$3,428
May 1996	186	571	19.43	—	$3,614
Apr 1996	197	596	21.51	—	$4,237
Mar 1996	114	591	19.38	—	$2,209
Feb 1996	185	686	16.98	—	$3,141
Jan 1996	186	752	17.07	—	$3,175
Dec 1995	183	918	17.19	—	$3,146
Nov 1995	0	220	16.00	—	$0
Oct 1995	188	786	15.43	—	$2,901
Sep 1995	374	1,114	16.18	—	$6,051
Aug 1995	184	951	15.92	—	$2,929
Jul 1995	179	945	15.24	—	$2,728
Jun 1995	193	1,051	16.41	—	$3,167
May 1995	176	745	17.56	—	$3,091
Apr 1995	166	1,210	17.73	—	$2,943
Mar 1995	368	864	16.44	—	$6,050
Feb 1995	364	917	16.58	—	$6,035
Jan 1995	365	1,416	15.92	—	$5,811
Dec 1994	178	1,071	15.03	—	$2,675
Nov 1994	360	1,437	15.90	—	$5,724
Oct 1994	544	1,804	15.58	—	$8,476
Sep 1994	363	1,804	15.29	—	$5,550
Aug 1994	459	1,906	16.13	—	$7,404
Jul 1994	635	2,414	17.56	—	$11,151
Jun 1994	532	2,615	17.09	—	$9,092
May 1994	712	2,403	15.88	—	$11,307
Apr 1994	367	2,235	14.14	—	$5,189
Mar 1994	526	1,984	12.46	—	$6,554
Feb 1994	350	1,916	12.50	—	$4,375
Jan 1994	702	2,639	12.66	—	$8,887
Dec 1993	686	3,261	12.33	—	$8,458
Nov 1993	1,023	3,303	14.49	—	$14,823
Oct 1993	698	3,324	15.85	—	$11,063
Sep 1993	877	3,440	15.03	—	$13,181
Aug 1993	1,023	3,612	15.66	—	$16,020
Jul 1993	1,001	2,693	15.46	—	$15,475
Jun 1993	1,220	4,447	16.79	—	$20,484
May 1993	2,079	1,701	17.68	—	$36,757
Apr 1993	1,761	3,403	18.05	—	$31,786
Mar 1993	3,318	3,302	18.14	—	$60,189
Feb 1993	2,846	4,060	17.90	—	$50,943
Jan 1993	0	108	16.93	—	$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.

Feb 2009 — as filed, then multipliedworked

Oil                   52 bbl  × $ 32.81 =     $1,706
Casinghead gas         0 Mcf  × $  4.63 =         $0

────────────────────────────────────────────────────
Month total                                   $1,706

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. 03/O/21635 is the state's own key, not one this site invented.