Archive for May, 2016

Unconventional hydrocarbons – Understanding the Potential Environmental Impacts

In the continuing drive to meet the world’s future energy needs, few can have missed the increased recent prominence of unconventional hydrocarbons. The extraction of resources such as shale gas, using techniques like hydraulic fracturing (or fracking) has gained attention from around the world, both for its potential to fulfil our energy requirements, as well as due to concerns around possible environmental impacts.

Chemistry has a strong role to play in helping us to understand potential environmental impacts, particularly areas such as air and water quality. The Royal Society of Chemistry supports the research community examining these issues, as chemical sciences research can help to inform broader policy decisions on this issue. We publish papers and books across our portfolio of journals, including those that encourage scientific debate and have actively supported those in the research community to share knowledge and advance science. To mark the publication of a report that explores research questions in this area, we have gathered some of our best publications on this topic to share with readers.

Unconventional hydrocarbon extraction in different countries has evolved at different rates. In the US there has been rapid exploration that has led to commercial scale production, whilst in the UK we are at a much earlier stage of the debate. Examining the situation in places like the US, which has a comparatively more established shale gas industry, can help us to determine what is known about the potential environmental impacts and where research, including chemistry, can help to address unknowns.

In November 2015, the UK Natural Environment Research Council (NERC), the US National Science Foundation (NSF) and the Environment, Sustainability and Energy Division of the Royal Society of Chemistry brought together researchers from the US and the UK at a workshop on Improving the Understanding of the Potential Environmental Impacts Associated with Unconventional Hydrocarbons. The aim of the workshop was to share knowledge in this rapidly changing area, particularly with respect to identifying research gaps and areas where future research may be needed. The range of topics covered by the workshop was broad, including areas such as air quality and wastewater treatment, which have a direct link with the chemical sciences, through to seismicity and socioeconomic impacts.

Participants at the workshop had the opportunity to present current research in their field, taking into account the specific situation in their country.  Discussions at the workshop examined similarities and differences between the different nations, leading onto the identification of knowledge gaps and future research needs.

The workshop’s co-chairs, Professor Richard Davies of Newcastle University and Professor Danny Reible at Texas Tech used the discussions from the meeting to produce a report, Joint US-UK Workshop on Improving the Understanding of the Potential Environmental Impacts Associated with Unconventional Hydrocarbons. The report captures key research gaps and needs in a whole range of areas from community engagement, to human health to waste water management.

Professor Richard Davies commented: “This workshop represented a valuable opportunity to prioritise and tailor research questions that could help us to better understand any potential environmental impacts if unconventional hydrocarbon extraction were to take place in the UK. The report examines both near-term and long-term research priorities for the research communities working in this area”.

The report will be relevant to researchers working on unconventional hydrocarbon extraction, outlining future research opportunities and needs. You can watch Professor Fred Worrall, one of the UK workshop participants talk about some of the points covered at the workshop in his lecture Exploring the impact of the unknown: a potential UK shale gas industry. Fred’s work on monitoring emissions relating to onshore oil and gas operations is also the subject of a recent Education in Chemistry article.

We hope that you will enjoy reading about both recent research advances and future areas for investigation in an area that will likely continue to feature in both scientific and public discourse.

Books

Fracking
Editors: R E Hester, R M Harrison
Print publication date: 02 Sep 2014
DOI: 10.1039/9781782620556

Principles and Practice of Analytical Techniques in Geosciences
Editor: Kliti Grice
Print publication date: 11 Sep 2014
DOI: 10.1039/9781782625025

Reviews

Evolving shale gas management: water resource risks, impacts, and lessons learned
Brian G. Rahm and Susan J. Riha
Environ. Sci.: Processes Impacts, 2014,16, 1400-1412
DOI: 10.1039/C4EM00018H

Use of stable isotopes to identify sources of methane in Appalachian Basin shallow groundwaters: a review
J. Alexandra Hakala
Environ. Sci.: Processes Impacts
, 2014,16, 2080-2086
DOI:
10.1039/C4EM00140K

Unconventional oil and gas extraction and animal health
M. Bamberger and   R. E. Oswald
Environ. Sci.: Processes Impacts
, 2014,16, 1860-1865
DOI:
10.1039/C4EM00150H

Practical measures for reducing the risk of environmental contamination in shale energy production
Paul Ziemkiewicz, John D. Quaranta and Michael McCawley
Environ. Sci.: Processes Impacts
, 2014,16, 1692-1699
DOI: 10.1039/C3EM00510K

Air quality concerns of unconventional oil and natural gas production
R. A. Field, J. Soltis and   S. Murphy
Environ. Sci.: Processes Impacts
, 2014,16, 954-969
DOI:
10.1039/C4EM00081A

Analysis

Deciphering the true life cycle environmental impacts and costs of the mega-scale shale gas-to-olefins projects in the United States
Chang He and   Fengqi You
Energy Environ. Sci.
, 2016,9, 820-840 DOI: 10.1039/C5EE02365C

Wells to wheels: water consumption for transportation fuels in the United States
David J. Lampert, Hao Cai and Amgad Elgowainy
Energy Environ. Sci.
, 2016,9, 787-802
DOI:
10.1039/C5EE03254G

Papers

Solid-phase extraction followed by gas chromatography-mass spectrometry for the quantitative analysis of semi-volatile hydrocarbons in hydraulic fracturing wastewaters
Julia Regnery, Bryan D. Coday, Stephanie M. Riley and  Tzahi Y. Cath
Anal. Methods
, 2016,8, 2058-2068
DOI:
10.1039/C6AY00169F

Partitioning of naturally-occurring radionuclides (NORM) in Marcellus Shale produced fluids influenced by chemical matrix
Andrew W. Nelson, Adam J. Johns, Eric S. Eitrheim, Andrew W. Knight, Madeline Basile, E. Arthur Bettis III, Michael. K. Schultz and   Tori Z. Forbes
Environ. Sci.: Processes Impacts
, 2016,18, 456-463
DOI:
10.1039/C5EM00540J

A liter-scale microbial capacitive deionization system for the treatment of shale gas wastewater
Casey Forrestal, Alexander Haeger, Louis Dankovich IV, Tzahi Y. Cath and   Zhiyong Jason Ren
Environ. Sci.: Water Res. Technol.
, 2016,2, 353-361
DOI:
10.1039/C5EW00211G

Detection of water contamination from hydraulic fracturing wastewater: a μPAD for bromide analysis in natural waters
Leslie J. Loh,a Gayan C. Bandara,a Genevieve L. Webera and  Vincent T. Remcho*a

Analyst, 2015,140, 5501-5507
DOI:
10.1039/C5AN00807G

Microbial capacitive desalination for integrated organic matter and salt removal and energy production from unconventional natural gas produced water
Casey Forrestal, Zachary Stoll, Pei Xu and  Zhiyong Jason Ren
Environ. Sci.: Water Res. Technol.
, 2015,1, 47-55
DOI: 10.1039/C4EW00050A

Stimuli-responsive/rheoreversible hydraulic fracturing fluids as a greener alternative to support geothermal and fossil energy production
H. B. Jung, K. C. Carroll, S. Kabilan, D. J. Heldebrant, D. Hoyt, L. Zhong, T. Varga, S. Stephens, L. Adams, A. Bonneville, A. Kuprat and   C. A. Fernandez
Green Chem.
, 2015,17, 2799-2812
DOI:
10.1039/C4GC01917B

Geo-material microfluidics at reservoir conditions for subsurface energy resource applications
Mark L. Porter, Joaquín Jiménez-Martínez, Ricardo Martinez, Quinn McCulloch, J. William Carey and Hari S. Viswanathan
Lab Chip
, 2015,15, 4044-4053
DOI:
10.1039/C5LC00704F

Shale gas-to-syngas chemical looping process for stable shale gas conversion to high purity syngas with a H2:CO ratio of 2:1
Siwei Luo, Liang Zeng, Dikai Xu, Mandar Kathe, Elena Chung, Niranjani Deshpande, Lang Qin, Ankita Majumder, Tien-Lin Hsieh, Andrew Tong, Zhenchao Sun and Liang-Shih Fan
Energy Environ. Sci.
, 2014,7, 4104-4117
DOI:
10.1039/C4EE02892A

Organic compounds in produced waters from shale gas wells
Samuel J. Maguire-Boyle and Andrew R. Barron
Environ. Sci.: Processes Impacts
, 2014,16, 2237-2248
DOI:
10.1039/C4EM00376D

Automated method for determining the flow of surface functionalized nanoparticles through a hydraulically fractured mineral formation using plasmonic silver nanoparticles
Samuel J. Maguire-Boyle, David J. Garner, Jessica E. Heimann, Lucy Gao, Alvin W. Orbaek and  Andrew R. Barron
Environ. Sci.: Processes Impacts
, 2014,16, 220-231
DOI:
10.1039/C3EM00718A

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Between a rock and a hard place: greenhouse gas storage and natural resource extraction

Humans are continuing to release increasing amounts of greenhouse gases to the atmosphere that have been implicated as key contributors to climate change. One major greenhouse gas is CO2. It is estimated that geological storage could result in a 17% reduction in atmospheric CO2 by 2050. Such projects aim to use sedimentary basins as they are believed to be the safest option for long-term storage of CO2 and other greenhouse gases. However, sedimentary basins are also valued for a range of extractable natural resources such as groundwater, oil and gas, and geothermal energy. Thus, there is a need to understand the potential interactions between these resources and subsurface storage of CO2 when targeting a particular site for CO2 storage.

A recently published study involving researchers from various institutes in Western Australia explain the potential risks involved with geological CO2 storage. Considering all the potential interactions between basin resource use and CO2 storage, the authors outline a Framework for Basin Resource Management Strategy (FBRMS) for optimizing interactions that may occur during the management of sedimentary basins.

Potential impacts of CO2 geological storage on other basin resources (reproduced from K. Michael
et al., EAGE Third Sustainable Earth Sciences 2015 Conference, DOI: 10.3997/2214-4609.201414262)

The initial stage of the FBRMS is an assessment of potential basins for CO2 storage based on containment potential of the subsurface. Optimal conditions include thick layers of low permeability rocks such as shales and anhydrites that can effectively cap the CO2. Lateral containment should be provided by lateral decreases in permeability, low permeability faults, or, in the absence of physical barriers, residual trapping, dissolution into water and mineral formation via reactions with the subsurface matrix. In addition to geologic characterization, modelling, monitoring and risk assessment are crucial for verifying long-term CO2 containment.

Also considered in the FBRMS are the two general means by which CO2 storage can affect other basin resources: migration and increasing basin pressure. Vertical or horizontal migration may result in contamination of natural gas or another currently used or potentially extractable resource.

Once CO2 is present in the subsurface, the future potential use of the injected area is instantly limited. An important concern associated with using shale basins is that shale may be used as an unconventional gas resource in future, and the methods for utilizing this resource negate its effectiveness as a long-term cap for CO2 storage. Though the probability is extremely low, increasing subsurface pressure from CO2 injection could also force saline water upwards along a wellbore or through existing fractures into groundwater resources, or may even cause fractures. Regardless of the likelihood, identifying all of these risks is an important facet of the FBRMS, presumably leading to relevant monitoring activities. On the other hand, increased pressure could also be beneficial in counteracting reduced pressure in mature oil or gas fields, low groundwater levels, or subsidence.

The FBRMS integrates all of these concerns to evaluate the likelihood of various basin resource-storage interactions, how beneficial or detrimental the interactions would be, and to determine how best to manage these interactions. It is intended to be used by various project stakeholders throughout the lifetime of a project, and may require intensive data collection or expert risk assessment depending on the individual project being assessed.


To read the full paper for free*, click the link below:

Framework for the assessment of interaction between CO2 geological storage and other sedimentary basin resources
K. Michael, S. Whittaker, S. Varma, E. Bekele, L. Langhi, J. Hodgkinson, and B. Harris
Environ. Sci.: Processes Impacts,
2016, 18, 164-175
DOI: 10.1039/C5EM00539F

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About the webwriter

Abha Parajulee is a Ph.D. student at the University of Toronto Scarborough. She is interested in water resources and the behavior of organic contaminants in urban environments.

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* Access is free until 01/06/2016 through a registered RSC account.

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