A closer look at the four Zavanna Tomahawk wells in the East Fork oil field. A single well (#23115) was drilled back in 2012. In 2014, a 3-well pad was drilled about 150 feet to the northeast (#28431 - #28433, inclusive).
In a long note like this there will be typographical and factual errors; if this is important to you, go to the source, NDIC and FracFocus.
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- 28431, A, Zavanna, Tomahawk 10-3 2TFH, East Fork, upper Three Forks, 28' thick; stimulated 9/11/15; 35 stages; 6 million lbs; no test date, s7/14; cum 10K over 2.5 months; stand-alone post later;
NDIC File No: 28431 API No: 33-105-03530-00-00 CTB No: 223115
Well Type: OG Well Status: A Status Date: 11/4/2015 Wellbore type: Horizontal
Location: SWSE 10-155-99 Latitude: 48.256711 Longitude: -103.397738
Current Operator: ZAVANNA, LLC
Current Well Name: TOMAHAWK 10-3 2TFH
Elevation(s): 2224 KB 2199 GR 2199 GL Total Depth: 20650 Field: EAST FORK
Spud Date(s): 7/7/2014
Completion Data
Pool: BAKKEN Perfs: 11459-20586 Comp: 11/4/2015 Status: F Date: 11/4/2015 Spacing: 2SEC
Cumulative Production Data
Pool: BAKKEN Cum Oil: 10226 Cum MCF Gas: 6568 Cum Water: 124863
Monthly Production Data:
| Pool | Date | Days | BBLS Oil | Runs | BBLS Water | MCF Prod | MCF Sold | Vent/Flare |
| BAKKEN | 1-2016 | 31 | 3482 | 3323 | 34892 | 0 | 0 | 0 |
| BAKKEN | 12-2015 | 12 | 2111 | 2064 | 15670 | 2442 | 1891 | 372 |
| BAKKEN | 11-2015 | 29 | 4633 | 4267 | 68811 | 4056 | 3608 | 16 |
| BAKKEN | 10-2015 | 2 | 0 | 0 | 5490 | 70 | 0 | 40 |
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- 28432, A, Zavanna, Tomahawk 10-3 3H, East Fork, a middle Bakken, 36 stages, 6 million lbs; no IP, stimulated 9/1/15; s7/14; cum 64K over 3 months;
NDIC File No: 28432 API No: 33-105-03531-00-00 CTB No: 223115
Well Type: OG Well Status: A Status Date: 11/5/2015 Wellbore type: Horizontal
Location: SWSE 10-155-99 Latitude: 48.256711 Longitude: -103.397615
Current Operator: ZAVANNA, LLC
Current Well Name: TOMAHAWK 10-3 3H
Elevation(s): 2224 KB 2199 GR 2199 GL Total Depth: 20790 Field: EAST FORK
Spud Date(s): 7/2/2014
Completion Data
Pool: BAKKEN Perfs: 11327-20713 Comp: 11/5/2015 Status: F Date: 11/5/2015 Spacing: 2SEC
Cumulative Production Data
Pool: BAKKEN Cum Oil: 64022 Cum MCF Gas: 38160 Cum Water: 87019
Monthly Production Data:
| Pool | Date | Days | BBLS Oil | Runs | BBLS Water | MCF Prod | MCF Sold | Vent/Flare |
| BAKKEN | 1-2016 | 29 | 27658 | 26302 | 31260 | 0 | 0 | 0 |
| BAKKEN | 12-2015 | 27 | 14846 | 14320 | 20077 | 14999 | 14282 | 315 |
| BAKKEN | 11-2015 | 26 | 21518 | 19820 | 32286 | 22851 | 17257 | 5207 |
| BAKKEN | 10-2015 | 2 | 0 | 0 | 3396 | 310 | 0 | 280 |
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- 28433, 0 (no typo), Zavanna, Tomahawk 10-3 4TFH, East Fork, a middle Bakken according to stimulaton sundry form but likely a typo since rest of file suggests a Three Forks well, 40 stages, 7.4 million lbs; stimulated 10/22/15; cum 70K over 3 months;
NDIC File No: 28433 API No: 33-105-03532-00-00 CTB No: 223115
Well Type: OG Well Status: A Status Date: 11/8/2015 Wellbore type: Horizontal
Location: SWSE 10-155-99 Latitude: 48.256711 Longitude: -103.397492
Current Operator: ZAVANNA, LLC
Current Well Name: TOMAHAWK 10-3 4TFH
Elevation(s): 2224 KB 2199 GR 2199 GL Total Depth: 21330 Field: EAST FORK
Spud Date(s): 6/30/2014
Completion Data
Pool: BAKKEN Perfs: 11440-21265 Comp: 11/8/2015 Status: GL Date: 12/2/2015 Spacing: 2SEC
Cumulative Production Data
Pool: BAKKEN Cum Oil: 70440 Cum MCF Gas: 69809 Cum Water: 77782
Production Test Data
IP Test Date: 10/22/2015 Pool: BAKKEN IP Oil: 0 IP MCF: 506 IP Water: 1396
Monthly Production Data:
| Pool | Date | Days | BBLS Oil | Runs | BBLS Water | MCF Prod | MCF Sold | Vent/Flare |
| BAKKEN | 1-2016 | 31 | 19313 | 18501 | 19714 | 0 | 0 | 0 |
| BAKKEN | 12-2015 | 31 | 29380 | 27969 | 32036 | 41880 | 33798 | 7620 |
| BAKKEN | 11-2015 | 19 | 21747 | 20031 | 22740 | 26986 | 14300 | 12403 |
| BAKKEN | 10-2015 | 4 | 0 | 0 | 3292 | 943 | 0 | 883 |
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- 23115, 773, Zavanna, Tomahawk 10-3 1H, East Fork, a middle Bakken, 35 stages, 4 million lbs; t9/12; cum 280K 1/16;
NDIC File No: 23115 API No: 33-105-02665-00-00 CTB No: 223115
Well Type: OG Well Status: A Status Date: 9/13/2012 Wellbore type: Horizontal
Location: SWSE 10-155-99 Latitude: 48.256547 Longitude: -103.398152
Current Operator: ZAVANNA, LLC
Current Well Name: TOMAHAWK 10-3 1H
Elevation(s): 2222 KB 2198 GR 2200 GL Total Depth: 20570 Field: EAST FORK
Spud Date(s): 6/25/2012
Completion Data
Pool: BAKKEN Perfs: 11313-20570 Comp: 9/13/2012 Status: GL Date: 5/30/2015 Spacing: 2SEC
Cumulative Production Data
Pool: BAKKEN Cum Oil: 279721 Cum MCF Gas: 425315 Cum Water: 252711
Production Test Data
IP Test Date: 9/24/2012 Pool: BAKKEN IP Oil: 773 IP MCF: 935 IP Water: 710
Monthly Production Data:
| Pool | Date | Days | BBLS Oil | Runs | BBLS Water | MCF Prod | MCF Sold | Vent/Flare |
| BAKKEN | 1-2016 | 31 | 6294 | 6173 | 8224 | 0 | 0 | 0 |
| BAKKEN | 12-2015 | 31 | 3376 | 3534 | 22015 | 19661 | 18700 | 499 |
| BAKKEN | 11-2015 | 13 | 3213 | 3727 | 19045 | 6133 | 6133 | 0 |
| BAKKEN | 10-2015 | 0 | 0 | 244 | 0 | 0 | 0 | 0 |
| BAKKEN | 9-2015 | 2 | 274 | 0 | 267 | 934 | 902 | 2 |
| BAKKEN | 8-2015 | 31 | 11210 | 10541 | 10264 | 41541 | 39543 | 1536 |
| BAKKEN | 7-2015 | 29 | 11650 | 11421 | 7990 | 28190 | 27410 | 348 |
| BAKKEN | 6-2015 | 23 | 17327 | 15542 | 11278 | 30462 | 29381 | 738 |
| BAKKEN | 5-2015 | 2 | 3660 | 1438 | 1940 | 3053 | 2892 | 131 |
| BAKKEN | 4-2015 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| BAKKEN | 3-2015 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| BAKKEN | 2-2015 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| BAKKEN | 1-2015 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| BAKKEN | 12-2014 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| BAKKEN | 11-2014 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| BAKKEN | 10-2014 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| BAKKEN | 9-2014 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| BAKKEN | 8-2014 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| BAKKEN | 7-2014 | 23 | 3694 | 3471 | 2288 | 4398 | 3877 | 163 |
| BAKKEN | 6-2014 | 29 | 5698 | 5706 | 4428 | 6755 | 5902 | 421 |
| BAKKEN | 5-2014 | 11 | 1769 | 1710 | 1492 | 1605 | 1156 | 285 |
| BAKKEN | 4-2014 | 21 | 3126 | 3674 | 2277 | 4391 | 3982 | 96 |
| BAKKEN | 3-2014 | 31 | 6278 | 6125 | 3981 | 6463 | 2803 | 3198 |
| BAKKEN | 2-2014 | 28 | 7804 | 7201 | 4910 | 8054 | 335 | 7302 |
| BAKKEN | 1-2014 | 31 | 6320 | 6723 | 4084 | 6398 | 3546 | 2390 |
| BAKKEN | 12-2013 | 31 | 6939 | 6466 | 4447 | 7728 | 6331 | 935 |
| BAKKEN | 11-2013 | 30 | 5713 | 6354 | 3736 | 6706 | 5037 | 1222 |
| BAKKEN | 10-2013 | 31 | 7809 | 7785 | 5009 | 8594 | 7516 | 616 |
| BAKKEN | 9-2013 | 20 | 4676 | 3399 | 4063 | 5446 | 4896 | 252 |
| BAKKEN | 8-2013 | 22 | 4738 | 5248 | 3404 | 6877 | 5707 | 827 |
| BAKKEN | 7-2013 | 27 | 8986 | 8302 | 5641 | 12948 | 11177 | 1354 |
| BAKKEN | 6-2013 | 30 | 10003 | 11008 | 6397 | 14285 | 12843 | 995 |
| BAKKEN | 5-2013 | 31 | 11187 | 10661 | 7191 | 15926 | 13679 | 1785 |
| BAKKEN | 4-2013 | 30 | 12694 | 11926 | 8335 | 18222 | 16106 | 1669 |
| BAKKEN | 3-2013 | 31 | 17965 | 18300 | 11541 | 26243 | 23245 | 2536 |
| BAKKEN | 2-2013 | 28 | 19366 | 19965 | 12445 | 27750 | 22923 | 4410 |
| BAKKEN | 1-2013 | 29 | 11833 | 11271 | 10718 | 16454 | 3261 | 12761 |
| BAKKEN | 12-2012 | 28 | 16381 | 16748 | 12386 | 23107 | 10189 | 12486 |
| BAKKEN | 11-2012 | 30 | 14953 | 14952 | 11629 | 21075 | 18536 | 2092 |
| BAKKEN | 10-2012 | 31 | 18432 | 18528 | 16145 | 24358 | 10619 | 13277 |
| BAKKEN | 9-2012 | 18 | 16353 | 15124 | 25141 | 21558 | 0 | 21275 |
Pay zones from the geologist's report, #23115:
The potential oil producing intervals logged during the vertical were from the lower Charles Formation to
the base of the Mission Canyon Formation.
They are
determined by gas data, samples, and reliable offset
well comparisons.
The
Ratcliffe Member
consists of about 100’ of interlaid deposits of dolomite,
limestone, and anhydrite. This member traditionally is t
he first interval to show a significant increase in
gas and porosity in this field.
Dark brown oil stain
was also observed in sample throughout the entire
interval.
The
Midale Member
is the basal member of Charles Formation. It generally consists of off white
to gray-brown argillaceous limestone
and dolomite with a few high-porosity zones. In general, the high
porosity zones are near the top of the member and correlate to beds of dolomite, the remainder being
limestone. Water saturation values indicate a favorable interval from 9,257’ to 9,262’.
During the curve, the primary oil-producing
zones start with the Mississippian-Devonian
Bakken
Formation. It is comprised of two black petroliferous shale members with a silty, calcite- and dolomite-
cemented sandstone middle member with some intergranular porosity.
This middle member was the
target for lateral drilling on this well.
The
Upper Bakken Shale Member
is characterized by high gamma
and consists of 20’ of black, carbon
aceous and petroliferous shale with abundant pyrite. It is considered a
source rock.
The
Middle Bakken Member
consists of three distinct lithologies, all of which are oil-
producing. A siltstone interval encountered directly below the Upper Shale Member, is generally light
brown to medium gray and shows
spotty to even brown oil stain
.
The second lithology of the
Middle
Bakken Member
is a fossiliferous limestone (packstone). It lies directly below the siltstone and is normally
about two feet thick as shown by nearby offset wells. The base of this packstone
defines the upper limit of
our target zone. Samples from this interval show
common even brown oil staining
.
The third distinct
lithology of the
Middle Bakken Member
is silty sandstone located directly below the packstone which also
contains the ideal target zone. It typically consists of silty sandstone comprised of some subangular
quartz grains which are moderately cemented with calcite and dolomite. It also contains trace amounts of
disseminated and nodular pyrite. The first 2’-3’ below the packstone within the Stony Creek field are
typified by decreasing amounts from top to
bottom of sucrosic dolomite in which
oil staining is the heaviest. However, this dolomite thinned out by the end of the well.