This Title All WIREs
How to cite this WIREs title:
WIREs Water
Impact Factor: 6.139

Mechanisms leading to potential impacts of shale gas development on groundwater quality

Full article on Wiley Online Library:   HTML PDF

Can't access this content? Tell your librarian.

The development of shale gas resources was made possible by the combination of horizontal drilling and high‐volume hydraulic fracturing (fracking). Environmental concerns have been raised relative to shale gas production, especially potential impacts on groundwater. Fluids related to unconventional oil and gas (O&G) operations contain chemical compounds that can impact groundwater quality. Such impacts can occur due to (1) the infiltration of surface contaminant releases, (2) failures of the integrity of O&G wells, and (3) upward fluid migration from a shale/tight reservoir along preferential paths that can be natural (faults or fracture zone) or man‐made (O&G wells). Surface releases represent the most probable mechanism leading to groundwater contamination. Improvements in O&G drilling operations under stringent regulations can minimize this risk. Experts identify O&G well integrity as the most challenging issue that may lead to groundwater contamination. Failure of casing and cement can lead to upward fluid flow within or outside O&G wells, especially of methane. Integrity failures leading to fluid migration to shallow fresh water aquifers or to the surface are well understood and can be detected and repaired, but this can be complex and costly. A few regulators now impose groundwater monitoring to detect impacts from integrity failures. Occurrences of communication with existing O&G wells from fracking operations have also led some regulators to impose rules aiming to avoid such potential fluid migration paths. There is an ongoing scientific debate regarding the potential for fluids to migrate upward from exploited shale gas units to aquifers through natural preferential paths. WIREs Water 2017, 4:e1188. doi: 10.1002/wat2.1188 This article is categorized under: Engineering Water > Sustainable Engineering of Water Science of Water > Water Quality
Schematic diagram of an oil & gas production well (A) and exploration well (B) (installations of O&G wells and typical depths after several sources). See Dussault and Jackson (2014) or EPA (2015) for typical horizontal well installations.
[ Normal View | Magnified View ]
Potential groundwater contamination mechanisms related to shale gas production (after CCA, 2014).
[ Normal View | Magnified View ]

Related Articles

Water, food, and energy security: scrambling for resources or solutions?
Political ecology of water conflicts
The Doomsday Equation and 50 years beyond: new perspectives on the human‐water system

Browse by Topic

Science of Water > Water Quality
Engineering Water > Sustainable Engineering of Water

Access to this WIREs title is by subscription only.

Recommend to Your
Librarian Now!

The latest WIREs articles in your inbox

Sign Up for Article Alerts