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Drilling Industry News

New Study Shows No Evidence of Ground Water Contamination from Hydraulic Fracturing

February 20, 2012

  Hydraulic fracturing of shale formations to extract natural gas has no direct connection to reports of ground water contamination, based on evidence reviewed in a study recently released by the Energy Institute at The University of Texas at Austin.

The study, released at the annual meeting of the American Association for the Advancement of Science (AAAS) in Vancouver, British Columbia, found that many problems ascribed to hydraulic fracturing are related to processes common to all oil and gas drilling operations, such as casing failures or poor cement jobs.

University researchers also concluded that many reports of contamination can be traced to aboveground spills or other mishandling of wastewater produced from shale gas drilling, rather than from hydraulic fracturing per se, says Charles "Chip" Groat, an Energy Institute associate director who led the project.

"These problems are not unique to hydraulic fracturing," he says.

The research team examined evidence contained in reports of ground water contamination attributed to hydraulic fracturing in three prominent shale plays – the Barnett Shale in North Texas; the Marcellus Shale in Pennsylvania, New York and portions of Appalachia; and the Haynesville Shale in western Louisiana and northeast Texas.

The report identifies regulations related to shale gas development, and evaluates individual states' capacity to enforce existing regulations. In addition, university researchers analyzed public perceptions of hydraulic fracturing, as derived from popular media, scientific literature and online surveys.

"Our goal was to provide policymakers a foundation for developing sensible regulations that ensure responsible shale gas development," Groat says. "What we've tried to do is separate fact from fiction."

Faculty members from across The University of Texas at Austin campus participated in the research, which the Energy Institute funded. The Environmental Defense Fund also assisted in developing the scope of work and methodology for the study.

Groat says that researchers will supplement the newly released study with an examination of reports relating to atmospheric emissions and seismic activity attributed to hydraulic fracturing, which have emerged as significant issues of concern in recent months.

Hydraulic fracturing involves the high-pressure injection of water, sand and chemicals into a shale bed, which causes the rock to shatter, releasing natural gas. The practice has been in use for decades but has come under scrutiny in recent years from environmentalists and others who fear it poses a threat to public health.

Other findings from the Energy Institute study:

  • Natural gas found in water wells within some shale gas areas (e.g., Marcellus) can be traced to natural sources and probably was present before the onset of shale gas operations.
  • Although some states have been proactive in overseeing shale gas development, most regulations were written before the widespread use of hydraulic fracturing.
  • Media coverage of hydraulic fracturing is decidedly negative, and few news reports mention scientific research related to the practice.
  • Overall, surface spills of fracturing fluids pose greater risks to ground water sources than from hydraulic fracturing itself.
  • The lack of baseline studies in areas of shale gas development makes it difficult to evaluate the long-term, cumulative effects and risks associated with hydraulic fracturing.

An overview of two other Energy Institute initiatives related to the use of hydraulic fracturing in shale gas development:

The first project, which will commence in April, is a detailed case study focusing on claims of ground water contamination in North Texas' Barnett Shale. The research will entail an examination of various aspects of shale gas development, including site preparation, drilling, production, and handling and disposal of flow-back water. Researchers also will identify and document activities unrelated to shale gas development that have resulted in water contamination. It also will assess the quantity of fresh groundwater used in shale gas development and evaluate ways to reduce the amount.

A second project, currently under development, would include a field and laboratory investigation of whether hydrological connectivity exists between water in the units above and below the shale unit being fractured as a result of the fracturing process. As envisioned, the project calls for university researchers to conduct field sampling of hydraulic fracturing fluid, flow-back water, produced water, and water from aquifers and other geologic units within the Barnett Shale.

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