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Title:Observations of the release of non-methane hydrocarbons from fractured shale
Authors:Sommariva, Roberto (Author)
Blake, Robert S (Author)
Cuss, Robert J (Author)
Cordell, Rebecca L (Author)
Harrington, Jon F (Author)
White, Iain R (Author)
Monks, Paul S (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:The organic content of shale has become of commercial interest as a source of hydrocarbons, owing to the development of hydraulic fracturing ("fracking"). While the main focus is on the extraction of methane, shale also contains significant amounts of non-methane hydrocarbons (NMHCs). We describe the first real-time observations of the release of NMHCs from a fractured shale. Samples from the Bowland-Hodder formation (England) were analyzed under different conditions using mass spectrometry, with the objective of understanding the dynamic process of gas release upon fracturing of the shale. A wide range of NMHCs (alkanes, cycloalkanes, aromatics, and bicyclic hydrocarbons) are released at parts per million or parts per billion level with temperature- and humidity-dependent release rates, which can be rationalized in terms of the physicochemical characteristics of different hydrocarbon classes. Our results indicate that higher energy inputs (i.e., temperatures) significantly increase the amount of NMHCs released from shale, while humidity tends to suppress it; additionally, a large fraction of the gas is released within the first hour after the shale has been fractured. These findings suggest that other hydrocarbons of commercial interest may be extracted from shale and open the possibility to optimize the "fracking" process, improving gas yields and reducing environmental impacts.
Keywords:Environmental impact, Hydraulic fracturing, Mass spectrometry
Year of publishing:2014
Number of pages:8891-8896
Numbering:48, 15
COBISS_ID:5421307 Link is opened in a new window
URN:URN:SI:UNG:REP:HVNFRBVH
DOI:10.1021/es502508w Link is opened in a new window
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Record is a part of a journal

Title:Environmental Science and Technology
Shortened title:Env. Sci. Technol.
Publisher:American Chemical Society
ISSN:0013936X
Year of publishing:2014

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