172

Notes on the Jurassic-Cretaceous Petroleum-Producing Zones in the Wapella-Moosomin Area, Southeastem Saskatchewan

by L.K. Kreis

Kreis. L.K. (1985): Notes on the Jurassic-Cretaceous petroleum-producing zones in the Wapella-Moosomin area; in Summary of Investigations 1985. Saskatchewan Geological Survey; Saskatchewan Energy and Mines. Miscellaneous Report 85-4.

The petroleum possibilities of the Wapella area were discussed in an unpublished internal report by Hutt and Schmid (1964). Well information collected since then is used in this report to upgrade their structure contour maps in the Wapella field and produce several new cross­sections in the Wapella area. In addition, stratigraphically related recent (1984) discoveries in the Moosomin and Red Jacket areas are compared. The relevant areas are shown in Fig. 1. A comprehensive bibliography is included.

" "" 2 I i

Well Information Subsequent to the study by Hutt and Schmid (February, 1964), 81 new wells have been drilled (26 field and 55 wildcat) as of January 1, 1985. T his g ives a grand total o f 145 wells in their study area (Fig. 1).

Ten of these new wells have core over at least some of the zone of interest (Jurassic-Cretaceous). This gives a sum total of 51 cores in their study area as of January 1, 1985.

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' I-- _..-+-+~+-+-+--+--f--1--lf--lf--lf-'--I .

Figure f - Location map.

-+--+--l--l~t--t-,1 - -- .L-.1.L-- '---~ ~ I , ·,

Generally, these newer holes have much better core recovery than was attainable from the earlier wireline types. Most of the cores are loc~ted at or near the known producing zones, especially those within the pool boundaries where producing zones are better defined. They also tend to be less than 20 m long, a fact which limits their usefulness to relatively short Jurassic or Cretaceous intervals.

Producing Zones Hutt and Schmid (1964) listed five producing zones. These were, in descending stratigraphic order, the Upper Blairmore, Wapella Sand, 16-33, 15-34 and 4-3 zones. The producing zone in the Upper Blairmore (now termed the Upper Mannvitle) was not adequately defined. As it was only present in one well, the Imperial-Tidewater Wapella No. 6-33-14-1 , it is hereby named the 6-33 zone, following Hutt and Schmid's naming convention. Their relative positions are shown in Fig. 2, CNW Wapella 10-35, though it must be noted that no one well in the area produces from all five zones. Recent drilling has discovered two additional producers in the equivalent of the 6-33 zone in the Wapella field (10-35-14-1W2 and 8-35-14-1W2). Cross­section D-0' (Fig. 14) shows the producing zone in these wells.

173

A miscellaneous basal Mannville(?) producer 7-17-15-1W2 (Figs. 3 and 4) was discovered in 1984. This zone is here

N CHW WAPELLA 10-35 1C- 35- 14-lW2

KB : 593 . lm

SP RES

s

AAN~V ILLE

5· 33 ZOOE

WA PELLA SANO

15-34 ZONE

4·3 ZCH,

UPt'flit WATROUS

Figure 2 - Geophysical log section showing relative positions of petroleum-producing zones in the Wapella area.

WAPELL A POOL

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" ::

D ' . • • " " " " " "

" " I 7 - 17· 1!H W2 N ORTH *APELJ....A

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" ~ . . . • . • . " " " " • • " . " "

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p

0 Rs,unJ 3 - Detailed location map showing well status, Wapella area.

CNS PCP WAPELLA 7-17 7-17- 15-1\12

SP

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7S2.5tn == UPPER liATROUS --= ~

--=.

Figure 4 - Geophysical log section showing basal Mannville producmg zone.

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kl : 583. bo,

SP RlS

JURASSIC

_ _ _ JURASSIC SHALE KA.RK[R

16·33 ,ON[

UPPER W..TROUS

Figure 6 - Geophysical log section showing 16-33 zone (Jurassic) in the Red Jacket discovery well (5-4-14-32W1 ).

174

r~t (.[ ST r: <L MOC SC'H I~ 1- 19 1-29-1'-31<1

SP R[S

Figure 5 - Geophysical log section showing 16-33 zone (Jurassic) in the Moosomin discovery well (1-29-14-31W1 ).

TR ico· Cl Al M():j'S~ I H 4-28 .:-t6 · 14 · JHI:

SP RES

Figure 7- Geophysical log section showing 4-3 zone (Jurassic) in the Moosomin discovery well 4-28-14-31W1.

designated the 7-17 zone. It is probably correlative with the 6-33 zone described above.

The majority of the increase in oil production in the study area comes from several zones in the Jurassic, such as are found in the wells in section 36 of township 14. Some miscellaneous Jurassic production just outside the Wapella Field boundary and production from the 16-33 zone in the North Wapella area (Figs. 2, 3 and 15) have also contributed. Fig. 3 shows the well status in the oil­producing portion of the study area on January 1, 1985.

New discoveries in the Moosomin and Red Jacket localities (Fig. 1) appear to be producing from two of the zones discussed above. In particular, the 16-33 zone, which occurs just below the Jurassic shale marker as in the Wapella Field and North Wapella area, is a producing

175

zone at both Moosomin and Red Jacket (Figs. 5 and 6). In addition. new production from what appears to be the equivalent of the 4-3 zone in the Wapella area is found in the Moosomin locality. The first production of this zone came from the 4-28-14-31W1 well, which was off­confidential as of May 18, 1985 (Fig. 7).

Structure and Stratigraphic Correlation The post-1964 data support the conclusion of Hutt and Schmid (1964) that the key to Wapella Sand deposition was the existence of an east-trending ridge, 30 m or more in height, through the Wapella Field (Fig. 8). However, correlations of the Wapella Sand employing new wells 1n the eastern half of the field are less certain. See Fig. 9 for the locations of these and other cross-sect ions.

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J.J,ASSIC r ROSIONAL SJRFACE

ZERO EOGE OF

WAPEL LA SAND

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0

Figure 8 - Structure conto ur map on the Jurassic erosional surface, Wapella area.

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176

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Figure 9 - Location map of structural-stratigraphic cross-sections, Wapella area.

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TOP OF WAPELLA SAND

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Figure 10 - Structure contour map on the top of Wapella Sand, Wapella area.

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177

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, A

kB: 594.1111 .:a S96 .8.m

------'-'------"-------"'""'--S---D.401un-----"--!--='-----

Figure 11 - Structural-stratigraphic cross-section A-A' .

Section A-A' (Fig. 11) is an east-west cross-section through an area of the field where the Wapella Sand was originally described and has proven to be productive. Section B-B' (Fig. 12) is a north-south cross-section through the same productive Wapella Sand reservoir. These two sections appear to be accurate in their correlation of Wapella Sand. The area shaded in Figs. 8 and 10 shows where the Wapella Sand is productive.

However, correlation further east is suspect because the shaly interval above the Wapella Sand in the west becomes silty or sandy in the east, thereby coalescing with sandy intervals above and forming one continuous sandy zone. This makes it difficult to recognize the

w.A.PElLA :Sili.'-0

JUR.A.S S>C.

continuity of the Wapella Sand as a separate entity in cross-sections constructed purely from geophysical logs. Section C-C' (Fig. 13) is an east-west section while D-D' (Fig. 14) is a north-south section in the area east of where the Wapella Sand is productive. The structure contours on the top of the Wapella Sand in this part of the Wapella Field (Fig. 10) are similarly suspect.

No detailed geological study of the area has been done, and such a study was beyond the scope of this report. However, the recent Jurassic discoveries in the Moosomin and Red Jacket areas show the region to have greater production potential than previously believed and a detailed study could prove rewarding.

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178

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Figure 12 • Structural-stratigraphic cross-section B-B'.

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7-3S-14-IW2

Figure 13 • Structural-stratigraphic cross-section C-C' .

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Figure 14 - Structural-stratigraph1c cross-section 0-0'

E

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Figure 15 - Structural-stratigraphic cross-section E-E'

Bibliography

Hutt, R.B. and Schmid, A.P (1964): Petroleum possibilities of the Wapella Area; unpubl. internal Sask. Energy Mines report.

Paterson, D.F. (1968): Jurassic megafossils of Saskatchewan with a note on Charophytes; Sask. Dep. Miner. Resour., Rep. 120, 135p.

Saskatchewan Department of Mineral Resources (1966): Reflection seismograph survey, Wapella area; Sask. Dep. Miner. Resour., Rep. 128.

179

CHM ""PHLA 9-35 8-35-1~-lWZ

r.J!: S9l. 7m

JA'.-t.:.Cl. N ~A ~Ul:\ ! ~-13 15 - l j- 15 -11.'?

SASWl l .... PELLA I-JS 1-J5-14-IW2

IC! 598.()111

NJ:.. ,1, ~.;H"H ~ ~~l l-li 16 -l.l i t - lJ-; 5- 11,~'

~

D

~NH_.ILLE

JURASSIC

~

E

UF"Pl:. it i.:A TRoC'..

Schmid, A.P. (1970): Some notes on Wapella area cores; in Mesozoic Core Seminar; Sask. Geol. Soc. and Sask. Dep. Miner. Resour., Oct. 29-30, 1970, Regina.

van Delinder, D.G. (1984): Source of oils in Cretaceous fields of southern Saskatchewan; in Oil and Gas in Saskatchewan; Sask. Geol. Soc., Spec. Publ. 7, p113-118.