Wednesday, March 2, 2016

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:

PoolDateDaysBBLS OilRunsBBLS WaterMCF ProdMCF SoldVent/Flare
BAKKEN1-2016313482332334892000
BAKKEN12-201512211120641567024421891372
BAKKEN11-20152946334267688114056360816
BAKKEN10-2015200549070040

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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:

PoolDateDaysBBLS OilRunsBBLS WaterMCF ProdMCF SoldVent/Flare
BAKKEN1-201629276582630231260000
BAKKEN12-2015271484614320200771499914282315
BAKKEN11-20152621518198203228622851172575207
BAKKEN10-201520033963100280

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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:

PoolDateDaysBBLS OilRunsBBLS WaterMCF ProdMCF SoldVent/Flare
BAKKEN1-201631193131850119714000
BAKKEN12-20153129380279693203641880337987620
BAKKEN11-201519217472003122740269861430012403
BAKKEN10-201540032929430883

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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:

PoolDateDaysBBLS OilRunsBBLS WaterMCF ProdMCF SoldVent/Flare
BAKKEN1-201631629461738224000
BAKKEN12-20153133763534220151966118700499
BAKKEN11-2015133213372719045613361330
BAKKEN10-2015002440000
BAKKEN9-2015227402679349022
BAKKEN8-20153111210105411026441541395431536
BAKKEN7-201529116501142179902819027410348
BAKKEN6-2015231732715542112783046229381738
BAKKEN5-2015236601438194030532892131
BAKKEN4-20150000000
BAKKEN3-20150000000
BAKKEN2-20150000000
BAKKEN1-20150000000
BAKKEN12-20140000000
BAKKEN11-20140000000
BAKKEN10-20140000000
BAKKEN9-20140000000
BAKKEN8-20140000000
BAKKEN7-20142336943471228843983877163
BAKKEN6-20142956985706442867555902421
BAKKEN5-20141117691710149216051156285
BAKKEN4-2014213126367422774391398296
BAKKEN3-201431627861253981646328033198
BAKKEN2-20142878047201491080543357302
BAKKEN1-201431632067234084639835462390
BAKKEN12-20133169396466444777286331935
BAKKEN11-201330571363543736670650371222
BAKKEN10-20133178097785500985947516616
BAKKEN9-20132046763399406354464896252
BAKKEN8-20132247385248340468775707827
BAKKEN7-20132789868302564112948111771354
BAKKEN6-201330100031100863971428512843995
BAKKEN5-2013311118710661719115926136791785
BAKKEN4-2013301269411926833518222161061669
BAKKEN3-20133117965183001154126243232452536
BAKKEN2-20132819366199651244527750229234410
BAKKEN1-20132911833112711071816454326112761
BAKKEN12-201228163811674812386231071018912486
BAKKEN11-20123014953149521162921075185362092
BAKKEN10-201231184321852816145243581061913277
BAKKEN9-20121816353151242514121558021275

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.

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