Gradient to Present on Hydraulic Fracturing at AAPG Meeting

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May 6, 2015

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Gradient News Alert

Gradient to Present on Hydraulic Fracturing at AAPG Meeting

The 2015 Annual Convention and Exhibition of the American Association of Petroleum Geologists (AAPG) will take place May 31 through June 3 at the Colorado Convention Center in Denver, Colorado. This international meeting will cover the most innovative technical trends and scientific advancements in multiple geoscience disciplines, and it serves as a premier networking and educational event for the oil and gas industry.

Samuel A. Flewelling, Ph.D. will present Evaluation of Human Health Risks via Drinking Water for Spills of Hydraulic Fracturing Fluids.” We have undertaken a human health risk evaluation for spills, specifically focusing on potential risks to drinking water in basins with shale and other tight oil- and gas-bearing formations. Our approach uses a probabilistic (Monte Carlo) framework to assess the likelihood of releases and chemical transport in a broad range of environmental settings, thus providing much-needed perspective on the overall plausibility of the migration scenarios and associated risks.

Matthew P. Tymchak, M.S. will present “Critical Review of Research on Potential Upward Migration of Hydraulic Fracturing Fluid and Brine.” Several studies have suggested that HF fluid pumped into target formations could migrate upward through overlying rocks and reach shallow, potable groundwater. However, recent modeling work and empirical data point to a lack of evidence for upward HF fluid and brine migration and suggest that the proposed pathway of HF fluid to overlying potable groundwater is unlikely to exist. This talk will evaluate the technical details of these field and modeling studies and will provide a critical review of their findings.

Click here for more detailed information and to learn how to register for the AAPG Conference.

Click here for more information about Gradient’s services related to hydraulic fracturing.

Gradient Overview

Gradient is an environmental and risk science consulting firm renowned for its specialties in Toxicology, Epidemiology, Risk Assessment, Product Safety, Contaminant Fate and Transport, and Environmental Chemistry. We employ sound science to assist national and global clients resolve complex problems related to chemicals in the environment, in the workplace, and in consumer products.

Related Gradient Publications

Flewelling, SA; Sharma, M. 2015. “Comment on “Hydraulic fracturing in faulted sedimentary basins: Numerical simulation of potential long-term contamination of shallow aquifers.” Water Resources Research
DOI: 10.1002/2014WR015904

Available at

Featured in the AAPG Explorer, Tymchak, MP; Flewelling, SA. 2014. “Evaluating methods to differentiate natural and induced seismicity.”

View abstract here.

Flewelling, SA; Sharma, M. 2014. “Constraints on upward migration of hydraulic fracturing fluid and brine.” Groundwater
DOI: 10.1111/gwat.12095

Available free at

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