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  • 1
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    SPE/SEG workshop: Injection-induced seismicity -- Engineering integration, evaluation, and mitigation (2016)
    Society of Exploration Geophysicists (SEG)
    Details
    Publication Date: 2016-06-23
    Description: An insightful technical workshop took place 28–30 March 2016 in Fort Worth, Texas, to discuss topics related to injection-induced seismicity. The workshop followed two previous events (September 2012 in Broomfield, Colorado, USA, and September 2014 in Banff, Alberta, Canada), which were held in cooperation between SEG and the Society of Petroleum Engineers (SPE). The workshop series has mirrored the evolving technical understanding of this important issue, as injection-induced seismicity has continued to develop over the last several years. While the previous two workshops focused primarily on seismology, the recent Fort Worth workshop purposely focused on engineering considerations. Similar to the previous two workshops, the Fort Worth workshop sold out, and a waiting list was established to handle the overflow.
    Print ISSN: 1070-485X
    Electronic ISSN: 1938-3789
    Topics: Geosciences
    Published by Society of Exploration Geophysicists (SEG)
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  • 2
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    Geomechanical modeling of induced seismicity resulting from hydraulic fracturing (2015)
    Society of Exploration Geophysicists (SEG)
    Details
    Publication Date: 2015-06-03
    Description: The number of instances of induced seismicity associated with hydraulic fracturing has increased over the last few years, resulting in the development of industry protocols to mitigate seismic hazard. The main focus of these protocols is "traffic-light" systems based on seismic monitoring, in which operations are modified if a specified "yellow-light" magnitude level is reached or ultimately are stopped at a "red-light" magnitude. A variety of operational changes is possible to mitigate the seismic hazard at the different traffic-light levels, including slowing injection rate or volume, skipping stages, or ultimately stopping or flowing back the well. Empirical evidence of induced-seismicity magnitudes, including microseismic-imaging projects in which no induced seismicity occurred, are inconclusive about the impact of changing volume or rate. Although the largest observed magnitudes occur at large injection volumes, significant variability in magnitudes is found for both injection rate and volume. Alternatively, a geomechanical simulation can examine pore-pressure diffusion and mechanical stresses and strains associated with hydraulic-fracture treatments and can be used to model fault activation and corresponding estimates of seismic magnitudes. These geomechanical models complement monitoring-based traffic-light systems and can be used to test various operational changes to identify a scenario that reduces seismic hazard.
    Print ISSN: 1070-485X
    Electronic ISSN: 1938-3789
    Topics: Geosciences
    Published by Society of Exploration Geophysicists (SEG)
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  • 3
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    Dynamic vs. static fishery closures [Sustainability Science] (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-01-21
    Description: In response to the inherent dynamic nature of the oceans and continuing difficulty in managing ecosystem impacts of fisheries, interest in the concept of dynamic ocean management, or real-time management of ocean resources, has accelerated in the last several years. However, scientists have yet to quantitatively assess the efficiency of...
    Keywords: Sustainability Science
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    Treating branch cuts in quantum trajectory models for photoelectron holography (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-12-21
    Description: Author(s): A. S. Maxwell, S. V. Popruzhenko, and C. Figueira de Morisson Faria Most implementations of Coulomb-distorted strong-field approaches that contain features such as tunneling and quantum interference use real trajectories in continuum propagation, while a fully consistent approach must use complex trajectories throughout. A key difficulty in the latter case are singu... [Phys. Rev. A 98, 063423] Published Thu Dec 20, 2018
    Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Response (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-08-10
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    One-third of global protected land is under intense human pressure (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-05-18
    Description: In an era of massive biodiversity loss, the greatest conservation success story has been the growth of protected land globally. Protected areas are the primary defense against biodiversity loss, but extensive human activity within their boundaries can undermine this. Using the most comprehensive global map of human pressure, we show that 6 million square kilometers (32.8%) of protected land is under intense human pressure. For protected areas designated before the Convention on Biological Diversity was ratified in 1992, 55% have since experienced human pressure increases. These increases were lowest in large, strict protected areas, showing that they are potentially effective, at least in some nations. Transparent reporting on human pressure within protected areas is now critical, as are global targets aimed at efforts required to halt biodiversity loss.
    Keywords: Ecology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    URTeC 2017 to focus on cross-disciplinary collaboration (2017)
    Society of Exploration Geophysicists (SEG)
    Details
    Publication Date: 2017-06-02
    Description: Preparations are well under way for the 2017 Unconventional Resources Technology Conference (URTeC), which will take place 24–26 July in Austin, Texas. URTeC is focused on the latest science and technology applied to exploration, appraisal, analysis, and development of unconventional resources. As with previous URTeC meetings, a strong technical program has been compiled and is complemented by a plenary session, core exhibits, networking receptions, eight short courses, nine topical breakfasts and luncheons, and a technical exhibition.
    Print ISSN: 1070-485X
    Electronic ISSN: 1938-3789
    Topics: Geosciences
    Published by Society of Exploration Geophysicists (SEG)
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  • 8
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    Strong technical program drives successful URTeC (2017)
    Society of Exploration Geophysicists (SEG)
    Details
    Publication Date: 2017-09-30
    Description: The 2017 edition of the Unconventional Resources Technology Conference (URTeC) took place 24–26 July in Austin, Texas. URTeC is an event focused on the latest science and technology applied to the exploration, appraisal, analysis, and development of unconventional resources. URTeC, cosponsored by SEG, the American Association of Petroleum Geologists, and the Society of Petroleum Engineers, provides a showcase for integrated geoscience and engineering technology for unconventional resources.
    Print ISSN: 1070-485X
    Electronic ISSN: 1938-3789
    Topics: Geosciences
    Published by Society of Exploration Geophysicists (SEG)
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  • 9
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    A dynamic ocean management tool to reduce bycatch and support sustainable fisheries (2018)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2018-05-31
    Description: Seafood is an essential source of protein for more than 3 billion people worldwide, yet bycatch of threatened species in capture fisheries remains a major impediment to fisheries sustainability. Management measures designed to reduce bycatch often result in significant economic losses and even fisheries closures. Static spatial management approaches can also be rendered ineffective by environmental variability and climate change, as productive habitats shift and introduce new interactions between human activities and protected species. We introduce a new multispecies and dynamic approach that uses daily satellite data to track ocean features and aligns scales of management, species movement, and fisheries. To accomplish this, we create species distribution models for one target species and three bycatch-sensitive species using both satellite telemetry and fisheries observer data. We then integrate species-specific probabilities of occurrence into a single predictive surface, weighing the contribution of each species by management concern. We find that dynamic closures could be 2 to 10 times smaller than existing static closures while still providing adequate protection of endangered nontarget species. Our results highlight the opportunity to implement near real-time management strategies that would both support economically viable fisheries and meet mandated conservation objectives in the face of changing ocean conditions. With recent advances in eco-informatics, dynamic management provides a new climate-ready approach to support sustainable fisheries.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Microseismic geomechanics of hydraulic-fracture networks: Insights into mechanisms of microseismic sources (2015)
    Society of Exploration Geophysicists (SEG)
    Details
    Publication Date: 2015-08-01
    Description: Microseismic interpretation of hydraulic fracturing requires an understanding of the mechanism of the microseismic sources. Quantitative geomechanical models can predict microseismicity for quantitative comparison with field data and can be used to reconcile 3D seismic earth models, fracture engineering, and fracture monitoring. Because microseismicity represents only one component of the geomechanical response to hydraulic fracturing, a microseismic geomechanics framework can provide insights into the connection with the fracture network. During hydraulic fracturing, microseismicity can be induced by both fluid pressure and stress mechanisms, resulting in wet events directly associated with the fracture network and remote dry events. Accurate interpretation of the hydraulic-fracture characteristics requires distinguishing identification of dry microseismicity not in hydraulic connection with the stimulated fracture network. Predictive microseismic geomechanical models also can be used to infer the primary, conductive hydraulic-fracture networks and to run scenario testing to improve engineering design.
    Print ISSN: 1070-485X
    Electronic ISSN: 1938-3789
    Topics: Geosciences
    Published by Society of Exploration Geophysicists (SEG)
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