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Grande Prairie

EDMONT ON

BRITIS H COLUMBIA

T p 100

T p 95

T p 90

T p 85

T p 80

T p 75

T p 70

T p 65

T p 60

T p 55

T p 50

A

A'

B

B'

In s u f f i c i e n t d a t a

Alberta Geological S urveywww.ags.aer.caPublished 2021IS BN 978-1-4601-4933-1

T OTAL DIS S OLVED S OLIDSMONT NEY HS U

ReferencesAlberta Geological S urvey (2019a): 3D Provincial Geological Framework Model of Alberta, version 2; Alberta Energy R egulator / AlbertaGeological S urvey, AER /AGS Model 2018-02, UR L <https://ags.aer.ca/publication/3d-pgf-model-v2.html> [November 2020].Alberta Geological S urvey (2019b): Alberta T able of Formations; Alberta Energy R egulator,UR L <https://ags.aer.ca/publications/T able_of_Formations_2019.html> [October 2019].Brinsk y, J. (2021): Distribution of hy draulic head in the Montney hy drostratigraphic unit; Alberta Energy R egulator / Alberta GeologicalS urvey, AER /AGS Map 614, scale 1:1 250 000.J ensen, G.K.S ., R ostron, B., Palombi, D. and Melnik , A. (2013): S ask atchewan Phanerozoic Fluids and Petroleum S y stems project:hy drogeological mapping framework;in S ummary of investigations 2013, v.1, S ask atchewan Geological S urvey, S ask atchewan Ministryof the Economy, Miscellaneous R eport 2013-4.1, Paper A-5,10 p.Natural R esources Canada (2012): CanVec digital topographic data; Natural R esources Canada, Earth S ciences S ector.<https://open.canada.ca/data/en/dataset/8ba2aa2a-7bb9-4448-b4d7-f164409fe056>> [May 2021].S ingh, A., Palombi, D., Nak evsk a, N., J ensen, G. and R ostron, B. (2017): An efficient approach for characterizing basin-scalehy drody namics; Marine and Petroleum Geology, p. 332–340, UR L <http://dx.doi.org/10.1016/j.marpetgeo.2017.02.015>.

SYMBOL LEGEND

"

"

E

L

M

D

E

L

M

D

E

L

M

H

I

P

A

I

P

A

H

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P

G

J

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B

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J

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J

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C

F

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N

C

F

K

N

E

L

M

D

M

73

7484

H

E

110°

110°112°

112°114°

120°60° 60°

52°

56°56°

52°

Edmonton

Calgary

49°

L

83

7282

T his map depicts the distribution of total dissolved solids (T DS ) in groundwater in the Montney hy drostratigraphic unit (HS U).T he horizontal and vertical extent of the unit was adopted from the 3D Provincial Geological Framework Model of Alberta,Version 2 (Alberta Geological S urvey, 2019a). T he relationship of the Montney HS U with the units above and below as wellas its geometry can be seen in Figures 1 and 2.MethodologyT he T DS distribution map is a result of an empirical Bay esian k riging technique using publicly available data from 189 waterchemistry analy ses from oil and gas wells. A screening process modified from J ensen et al. (2013) was used to ensure thatonly representative formation water chemistries were used. Measured T DS values range from 31 909 mg/L to 167 563 mg/L.T he final gridded map surface was clipped based on the spatial distribution of representative data. R esidual values areplotted at each location (Figure 3) to indicate where underprediction or overprediction occurs compared to measured T DSvalues.Additional formation-scale hy drogeological maps of the Montney HS U are presented in Figures 4 and 5. Figure 4 shows thedistribution of hy draulic head in the Montney HS U, with hy draulic heads calculated using fresh water density. Figure 5 showsthe water driving force (W DF) vector map for the Montney HS U. T he W DF vector map allows identification of areas wherethe buoy ancy effect of formation water density has the potential to change the inferred magnitude and direction ofgroundwater flow (S ingh et al., 2017). Buoy ancy appears to have some influence in the western and southern portion of themapped Montney HS U.

5900

000m

.N60

0000

0m.N

6100

000m

.N62

0000

0m.N

6300

000m

.N64

0000

0m.N

T p 60

T p 55

T p 50

T p 65

T p 70

AcknowledgementsData processing support by S . S tewart. Base data from the Atlas of Canada (Natural R esources Canada, 2012) and S patial DataW arehouse, Ltd. W ater driving force vector map created by A. S ingh.Recommended Reference FormatBrinsk y, J. (2021): Distribution of total dissolved solids in the Montney hy drostratigraphic unit; Alberta Energy R egulator / AlbertaGeological S urvey, AER /AGS Map 615, scale 1:1 250 000.

DisclaimerT he Alberta Geological S urvey and its employ ees and contractors mak e no warranty, guarantee or representation, express orimplied, or assume any legal liability regarding the correctness, accuracy, completeness, or reliability of the publication. W hen usinginformation from this publication in other publications or presentations, due ack nowledgement should be given to the Alberta EnergyR egulator / Alberta Geological S urvey.

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Figure 3. Calculated residuals between the modelled distributionof T DS and measured values. S y mbol classes are based on thestandard deviation of the calculated residuals.

Figure 4. Distribution of hy draulic head in the Montney HS U(Brinsk y, 2021). T he map extent is based on the spatial distributionof hy draulic head data and differs from the extent of the main map.

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R esidual (mg/L)

-12 499 to -4200-20 800 to -12 500

4101 to 12 500-4199 to 4100

16 501 to 25 00012 501 to 16 500

6200000m.N6300000m.N

6400000m.N5900000m.N

6000000m.N6100000m.N

Figure 1. R egional lithostratigraphy and hy drostratigraphy (based on Alberta Geological S urvey, 2019b). S olid teal lines highlight theMontney Formation. Dashed white lines depict the Montney HS U within the regional hy drostratigraphy. S trata above the FernieFormation are not shown.

Figure 5. W ater driving force vector map of the Montney HS U. T hemap covers only the area where the hy draulic head and T DSgridded surfaces overlap.

0 - 3031 - 6061 - 9091 - 180

Angle between water driving forceand hy draulic head vectors (degrees)

W ater driving force vector (x10-4)

D 0.6 -11

D 12 - 22

D 23 - 45

Figure 2. S chematic cross-sections identify ing the geometry and variable thick ness of the Montney HS U (not to scale). Permian andCarboniferous strata up to the Banff and Exshaw are not subdivided at the scale of these cross-sections.

T p 75

T p 80

T p 85

T p 90

T p 95

T p 100

R g 20 R g 15 R g 10 R g 5R g 1W 6R g 5R g 10600000m.E200000m.E 300000m.E 400000m.E 500000m.E

114°W116°W118°W120°W R g 1W 4 R g 20

R g 20 R g 15 R g 10 R g 5R g 25R g 1W 6R g 5600000m.E200000m.E 300000m.E 400000m.E 500000m.E.

114°W116°W118°W120°W R g 1W 5 R g 25

58°N

56°N

56°N

54°N

54°N

Projection: 10 Degree T ransverse Mercator Datum: North American Datum, 1983

S cale 1:1 250 00025 0 25 50 75 10012.5

k ilometres20 0 20 4010

miles

Hydrogeology by: J. Brinsky

Distribution of Total Dissolved Solids in the Montney Hydrostratigraphic Unit

Map 615

Hy draulic head (m asl)450 - 500501 - 550551 - 600601 - 650651 - 682

Hy drostratigraphic unit extentEastern limit of main Cordilleran deformationCross-section lineInsufficient data

A A'

Total Dissolved S olids (mg/L)30 000 - 50 00050 001 - 80 00080 001 - 110 000110 001 - 140 000140 001 - 160 000

!W ell data point