Stratigraphic Architecture Influence on Kh Variability Guelph, Ontario

Views:
 
     
 

Presentation Description

Presented October 29, 2015, at the International Association of Hydrogeologists meeting, this presentation illustrates the the influence of stratigraphic architecture on Kh (hydraulic conductivity) variability in the Guelph Region, Ontario. Key findings: a) Lithofacies changes are a key control on Kh distribution when they are associated with changes in permeability; and b) Sequence stratigraphy matters: Time breaks between rock packages often result in changes in lithology that tend to become solution enhanced if water has access….

Comments

Presentation Transcript

Evaluating the Influence of Stratigraphic Architecture on Kh Variability in the Guelph Region, ON :

Evaluating the Influence of Stratigraphic Architecture on Kh V ariability in the Guelph Region, ON Elizabeth Priebe (OGS), Christopher Neville (SSPA), Frank Brunton (OGS) September 29, 2015

Presentation Overview:

Presentation Overview Study area: Location, Geology Project Objectives Methods: Creation of 2 data sets Trends: Horizontal Hydraulic Conductivity ( Kh ) with stratigraphy and geographical distribution Application of Findings

Study Area: 600 km2, comprising the City of Guelph and surrounding area. :

Study Area: 600 km 2 , comprising the City of Guelph and surrounding area.

Slide4:

Geology : Early Silurian carbonates within the Michigan Basin Lockport Group Just west of the Niagara Escarpment Cuesta

Study Area: Bedrock Geology:

Study Area : Bedrock Geology

A History of Collaboration: the OGS and Guelph :

A History of Collaboration: the OGS and Guelph About the City of Guelph…… The City of Guelph has a population of about 110,000 people Guelph relies on the local carbonate bedrock aquifers for a water taking of more than 40 million litres per day . The OGS-City of Guelph Collaboration was founded on: Overlapping Initiatives starting in 2005: Guelph: 50 year water supply master Plan OGS: 3D mapping of bedrock groundwater in Lockport Group rocks A Shared View By improving our understanding of the local bedrock sequence stratigraphy, we will gain insight into the distribution and character of groundwater resources

Project Objectives:

Project Objectives Integrate horizontal hydraulic conductivity estimates ( Kh ) with geological characterization from various collaborative studies. Evaluate the influence of rock character and stratigraphic architecture on Kh variability.

Slide8:

Approach: Create 2 Data Sets High quality stratigraphic logs, Short-interval single hole hydraulic test analyses, Integrate and Evaluate Data S ets

Short-interval single hole hydraulic test analyses: Creating the Kh Data Set :

Short-interval single hole hydraulic test analyses : Creating the Kh Data Set 32 locations Discrete interval testing ~150 hydraulic tests, by a many different practitioners Test types : Slug tests, pumping tests and both conducted within packers

Hydraulic Test Analyses: Pumping and Slug Tests:

Hydraulic Test Analyses: Pumping and Slug Tests Hydraulic Conductivity estimates: a consistent approach to analysis for a level data set

Conceptual model of flow zone occurences:

Conceptual model of flow zone occurences (modified from Brunton and Britnell 2011)

Slide12:

Blue Area = ~ 10 -4 m/s Brown Area = ~ 10 -6 m/s

Slide13:

3x10 -4 5x10 -5 3x10 -4 Elevation ( masl ) Formation/Member Kh (m/s)

Slide14:

4x10 -6 3x10 -4 Elevation ( masl ) Formation-Member Kh (m/s)

Slide15:

Blue Area = ~ 10 -4 m/s Brown Area = ~ 10 -6 m/s

3 Major Geological Controls on Kh :

3 Major Geological Controls on Kh Lithofacies changes are a key control on Kh distribution when they are associated with changes in permeability Sequence stratigraphy matters: Time breaks between rock packages often result in changes in lithology that tend to become solution enhanced if water has access….

Slide18:

3. Location Where meteoric water has access to rock for chemical erosion is a key control. Re-entrants Joints Preferential erosion of overlying units

Application of Results:

Application of Results Advertisement for the value of integrating discrete hydraulic testing with sequence stratigraphic and lithofacies characterization to support water exploration. Many cities that rely on groundwater for municipal supply have these types of data buried in individual reports through time. By mining these data and creating a level data set, we can begin to understand the geologic controls on hydraulic conductivity distribution and use this information to support water supply exploration .

Acknowledgements:

Acknowledgements Peter Busatto and Dave Belanger ; City of Guelph John Piersol , Golder Associates Dr. Beth Parker and Dr. Pat Quinn , G360 Michelle Fraser , Stantec

References:

References Bouwer , H. and Rice, R.C. 1976. A slug test for determining hydraulic conductivity of unconfined aquifer with completely or partially penetrating wells; Water Resources Research, v.12, p.423. Brunton, F.R. and Brintnell , C. 2011. Final Update of Early Silurian Stratigraphy of the Niagara Escarpment and Correlation with Subsurface Units Across Southwestern Ontario and the Great Lakes Basin; in Summary of Field Work and Other Activities 2011, Ontario Geological Survey, Open File Report 6270, p.30-1 to 30-11. Butler, J.J. Jr. 1998. The Design, Performance and Analysis of Slug Tests: Lewis Publishers, A CRC Press Company, Boca Raton, Florida, 252p. Cooper, H.H., Bredehoeft , J.D., and Papadopulos , I.S. 1967. Response of a finite-diameter well to an instantaneous charge of water; Water Resources Research, v. 3, p. 263. Di Biase , S., Donald, S., Cichocki , A. and Petrie, J. 2006. Additional Groundwater Supplies for the City of Guelph, The Guelph Lime Project; unpublished report, Golder Associates Ltd., 74p. Funk, G. 2009. Arkell Spring Grounds Hydrogeological Study; unpublished report, AECOM Canada Ltd., 102p. Piersol , J. and Petrie, J. 2011. City of Guelph Tier III Assessment Characterization and Final Report, Appendix A.; unpublished report, Golder Associates Ltd. 66p. Quackenbush , P. and Gemin , J. 2014. The Corporation of the City of Guelph Water Supply Master Plan Update ( draft final report); unpublished report, AECOM Canada Ltd., and Golder Associates Ltd ., 183p . Yungwirth , G., Boonstra , G., Di Biase , S. and Petrie, J. 2008. Guelph Waterworks Groundwater Monitoring System ; unpublished report, Golder Associates Ltd, 7p.

authorStream Live Help