Random Look At Zavanna's Tomahawk Wells In East Fork Oil Field -- March 2, 2016

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.