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Title: Study of hydraulic fracturing processes in shale formations with complex geological settings

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Petroleum Science and Engineering
Additional Journal Information:
Journal Volume: 152; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 16:16:38; Journal ID: ISSN 0920-4105
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Citation Formats

Figueiredo, Bruno, Tsang, Chin-Fu, Rutqvist, Jonny, and Niemi, Auli. Study of hydraulic fracturing processes in shale formations with complex geological settings. Netherlands: N. p., 2017. Web. doi:10.1016/j.petrol.2017.03.011.
Figueiredo, Bruno, Tsang, Chin-Fu, Rutqvist, Jonny, & Niemi, Auli. Study of hydraulic fracturing processes in shale formations with complex geological settings. Netherlands. doi:10.1016/j.petrol.2017.03.011.
Figueiredo, Bruno, Tsang, Chin-Fu, Rutqvist, Jonny, and Niemi, Auli. Sat . "Study of hydraulic fracturing processes in shale formations with complex geological settings". Netherlands. doi:10.1016/j.petrol.2017.03.011.
title = {Study of hydraulic fracturing processes in shale formations with complex geological settings},
author = {Figueiredo, Bruno and Tsang, Chin-Fu and Rutqvist, Jonny and Niemi, Auli},
abstractNote = {},
doi = {10.1016/j.petrol.2017.03.011},
journal = {Journal of Petroleum Science and Engineering},
number = C,
volume = 152,
place = {Netherlands},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.petrol.2017.03.011

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Cited by: 1work
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  • At Oak Ridge National Laboratory the Pumpkin Valley Shale is used as a host formation for hydraulic fracturing waste disposal. Determination of the relationships between the distribution of different lithologies and porosity-permeability trends within this host formation allows these properties, important to hydraulic fracturing operations, to be related to measurable and mappable geological and petrological parameters. It also permits extrapolation of such patterns to little-studied portions of the Pumpkin Valley Shale. Such knowledge better allows for the satisfactory operation and assessment of the hydraulic fracturing at Oak Ridge National Laboratory.
  • The objective of this demonstration is to assess the technical and economic effectiveness of massive hydraulic fracturing for the development of the marginal gas resource known as the Devonian Shale. This summary of technical accomplishments to date includes a detailed geological analysis of both surface and subsurface data being made to select the most promising area for sites of 3 wells programed for testing. Sites for the drilling, coring, and casing of wells for testing will be selected. The intent in the first well is to hydraulically treat the total shale section. A maximum of 4 stages of treatment willmore » be designed, each to encompass 200 to 250 ft of shale thickness. Each treatment will be about 200,000 gas in fluid magnitude.« less
  • Hydraulic fracturing for natural gas extraction from shale produces waste brine known as flowback that is impounded at the surface prior to reuse and/or disposal. During impoundment, microbial activity can alter the fate of metals including radionuclides, give rise to odorous compounds, and result in biocorrosion that complicates water and waste management and increases production costs. Here, we describe the microbial ecology at multiple depths of three flowback impoundments from the Marcellus shale that were managed differently. 16S rRNA gene clone libraries revealed that bacterial communities in the untreated and biocide-amended impoundments were depth dependent, diverse, and most similar tomore » species within the taxa [gamma]-proteobacteria, [alpha]-proteobacteria, ╬┤-proteobacteria, Clostridia, Synergistetes, Thermotogae, Spirochetes, and Bacteroidetes. The bacterial community in the pretreated and aerated impoundment was uniform with depth, less diverse, and most similar to known iodide-oxidizing bacteria in the [alpha]-proteobacteria. Archaea were identified only in the untreated and biocide-amended impoundments and were affiliated to the Methanomicrobia class. This is the first study of microbial communities in flowback water impoundments from hydraulic fracturing. The findings expand our knowledge of microbial diversity of an emergent and unexplored environment and may guide the management of flowback impoundments.« less
  • Microbial communities associated with produced water from hydraulic fracturing are not well understood, and their deleterious activity can lead to significant increases in production costs and adverse environmental impacts. In this study, we compared the microbial ecology in prefracturing fluids (fracturing source water and fracturing fluid) and produced water at multiple time points from a natural gas well in southwestern Pennsylvania using 16S rRNA gene-based clone libraries, pyrosequencing, and quantitative PCR. The majority of the bacterial community in prefracturing fluids constituted aerobic species affiliated with the class Alphaproteobacteria. However, their relative abundance decreased in produced water with an increase inmore » halotolerant, anaerobic/facultative anaerobic species affiliated with the classes Clostridia, Bacilli, Gammaproteobacteria, Epsilonproteobacteria, Bacteroidia, and Fusobacteria. Produced water collected at the last time point (day 187) consisted almost entirely of sequences similar to Clostridia and showed a decrease in bacterial abundance by 3 orders of magnitude compared to the prefracturing fluids and produced water samplesfrom earlier time points. Geochemical analysis showed that produced water contained higher concentrations of salts and total radioactivity compared to prefracturing fluids. This study provides evidence of long-term subsurface selection of the microbial community introduced through hydraulic fracturing, which may include significant implications for disinfection as well as reuse of produced water in future fracturing operations.« less