Article
Energy & Fuels
Temoor Muther, Fahad Iqbal Syed, Amirmasoud Kalantari Dahaghi, Shahin Negahban
Summary: Gas adsorption onto the shale system is crucial for forecasting gas production and estimating reserves accurately. This study investigates the impact of different gas adsorption characteristics on reservoir production responses in Marcellus shale for different fractured well configurations. The analysis shows that gas desorption can improve overall gas production by up to 5% in a single-stage multi-clustered fractured horizontal well, with a more significant effect observed during longer flow periods and in areas with high surface area and large fracture networks.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Zepeng Sun, Yue Ni, Yuandong Wu, Yong Lei
Summary: Hydraulic fracturing combined with horizontal drilling is widely used in shale gas development. This study focused on the impact of pyrite oxidation on pore structure after fracturing. The results showed that pyrite-rich shale experienced mineral dissolution, leading to increased mesopores and enhanced pore-structure complexity. In contrast, pyrite-poor shale only underwent swelling and had degraded pore-structure complexity. These findings provide new insights into optimizing fracturing operation conditions based on shale's mineral composition characteristics.
Article
Energy & Fuels
Eleanor Spielman-Sun, Adam D. Jew, John R. Bargar
Summary: This study evaluates secondary mineral precipitation and permeability attenuation in carbonate-rich shale samples from the Delaware Basin using laboratory and synchrotron-based techniques. The results demonstrate that carbonate-rich shales have strong neutralization abilities towards acidic fracturing fluid and that the contribution of the acid spearhead to rock permeability enhancement is limited. This has important implications for acidizing carbonate-rich shale formations and iron transformations within these shales.
Article
Multidisciplinary Sciences
Stefan Ladage, Martin Blumenberg, Dieter Franke, Andreas Bahr, Ruediger Lutz, Sandro Schmidt
Summary: Methane emissions along the natural gas supply chain play a critical role in the climate benefits of switching from coal to natural gas in the power sector. For Germany, with methane leakage rates below specific break-even levels, transitioning to natural gas can significantly reduce CO2-equivalent GHG emissions.
SCIENTIFIC REPORTS
(2021)
Article
Energy & Fuels
Reilly M. Blocho, Richard W. Smith, Mark R. Noll
Summary: This study aimed to observe the composition of organic matter and anoxia conditions within the Marcellus Formation in New York State. Results showed that the primary source of organic matter was terrigenous plants with a minor contribution from marine sources. The kerogen type in the Marcellus Formation was determined to be type III.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Environmental Sciences
Ikenna A. Obasi, Nneka M. Onwa, Ezekiel O. Igwe
Summary: The study in the southern Benue Trough area of Nigeria found that the resistivity range for groundwater-bearing fracture zones in pre-Santonian sedimentary succession varies in fractured shales and sandstones. Wider fractures tend to have lower resistivity and higher water content, while the width of fractures gradually decreases below 80 meters depth in the area. The spatial distribution of resistivity shows an increase with depth, except for the fracture zones.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Computer Science, Interdisciplinary Applications
Sungil Kim, Yongjun Hong, Jung-Tek Lim, Kwang Hyun Kim
Summary: This study proposes the use of geostatistically generated well-log data to predict well productivity in Marcellus shale reservoirs using ensemble machine learning. The study finds that the addition of kriging-generated well-log data yields the best performance among the tested machine learning algorithms. The study also highlights the affordability and accessibility of basic well information compared to other well-log data, making it a useful tool for decision-makers in determining drilling targets.
COMPUTERS & GEOSCIENCES
(2023)
Article
Energy & Fuels
Andrzej P. Radlinski, Tomasz Blach, Phung Vu, Yeping Ji, Liliana de Campo, Elliot P. Gilbert, Klaus Regenauer-Lieb, Maria Mastalerz
Summary: The study demonstrates that only 6% of pores with diameters of 25-500 nm are accessible to methane in Marcellus Shale samples, while the accessible fraction for pores larger than 500 nm is 35%. Methane can penetrate into small mesopores and micropores down to at least 1 nm in diameter.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Engineering, Geological
Neel Gupta, Brijes Mishra
Summary: Time is often neglected in the assessment of erratic failure of shale rock. Constant stress induces time-dependent failure in brittle shale, mainly due to the formation of microcracks. Factors such as orientation of bedding planes and specimen heterogeneity also influence the nature of creep deformation in addition to time and constant differential stress levels.
Article
Environmental Sciences
Kristen Courtney Carpenter, Loic Bethel Dje, Mercy Achang, Mileva Radonjic
Summary: This study focuses on the geochemical analysis of flowback waters from Marcellus shale and evaluates the potential environmental impacts on water and soil quality. The results show that hydraulic fracturing fluids used to extract the shale's resources result in mineral-rich flowback waters containing hazardous contaminants. The effluent samples contain elevated levels of elements such as Cd, Cr, and Ca, which exceed safe limits and pose risks to safety and scaling.
Article
Environmental Sciences
George T. Merovich, Mack W. Frantz, Petra B. Wood
Summary: This study investigates the impacts of unconventional shale gas development on aquatic ecosystems and finds that it has weak negative effects on water quality and benthic macroinvertebrates. The impacts are particularly significant in the year with the most intense shale gas development activity, with downstream areas being affected more prominently.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Engineering, Civil
Hiroyuki Nakayama, Yasumasa Yamasaki, Kengo Ohashi, Shinji Nakaya
Summary: This study in the Tabora Region of Tanzania utilizes a simple method to determine the pumping discharge of drilling wells using data from electrical resistivity tomography surveys and lengths of topographic lineaments. It demonstrates the effectiveness of surface hydro-geophysical surveys in exploring groundwater resources and predicts an increase in water supply in the region. Areas suitable for residential use are identified based on well yield potential, showing the potential for applying this method to other regions with similar conditions in Tanzania and neighboring countries.
JOURNAL OF HYDROLOGY
(2021)
Article
Engineering, Geological
D. Cabrera, F. Samaniego
Summary: This research presents a novel petrophysical experiment for measuring the 3D permeability tensor at reservoir conditions in fractured vuggy carbonate rock. The experimental investigation demonstrates the permeability variation with confining pressure and reveals the elliptical behavior of permeability related to fracture network and matrix porosity systems. Additionally, the study contributes to the understanding of mechanical and flow aspects of permeability in naturally fractured reservoirs, providing a basis for improving reservoir simulation studies.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Environmental Sciences
Nur H. Orak, Matthew Reeder, Natalie J. Pekney
Summary: This study investigates emissions at an active Marcellus Shale well pad in the USA, identifying three main sources impacting air quality: natural gas, regional transport/photochemistry, and engine emissions. The study found that horizontal drilling phase significantly contributes to the natural gas factor, while engine emission factor increases over different well pad drilling periods. Regional transport/photochemistry factor is more pronounced during horizontal drilling and drillout stages.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Economics
Jennifer Ifft, Ao Yu
Summary: Future energy production on farmland may bring economic gains but could also result in decreased land values. This study examines the impact of a 2008 New York State moratorium on hydraulic fracturing, finding that it led to net economic losses for rural landowners.
