GEOCHEMICAL VARIABILITY WITHIN THE MARCELLUS FORMATION OF THE NORTHERN APPALACHIAN BASIN AND ITS IMPLICATIONS FOR PRODUCED WATER COMPOSITION OF UNCONVENTIONAL NATURAL GAS WELLS

2017 ◽  
Author(s):  
Katherine C. Herleman ◽  
Keyword(s):  
Natural Gas ◽  
Produced Water ◽  
Appalachian Basin ◽  
Gas Wells ◽  
Water Composition ◽  
Unconventional Natural Gas ◽  
Marcellus Formation ◽  
Northern Appalachian Basin

Estimates of unconventional natural-gas resources of the Devonian shale of the Appalachian Basin

1982 ◽  
Author(s):  
Ronald R. Charpentier ◽  
Wallace De Witt ◽  
G.E. Claypool ◽  
Larry D. Harris ◽  
R.F. Mast ◽  
...  
Keyword(s):  
Natural Gas ◽  
Appalachian Basin ◽  
Unconventional Natural Gas ◽  
Devonian Shale

Microbial capacitive desalination for integrated organic matter and salt removal and energy production from unconventional natural gas produced water

2015 ◽  
Vol 1 (1) ◽  
pp. 47-55 ◽  
Author(s):  
Casey Forrestal ◽  
Zachary Stoll ◽  
Pei Xu ◽  
Zhiyong Jason Ren
Keyword(s):  
Organic Matter ◽  
Natural Gas ◽  
Organic Contaminants ◽  
Energy Production ◽  
Produced Water ◽  
Positive Energy ◽  
Unconventional Natural Gas

An integrated microbial capacitive desalination system removed both organic contaminants and salts from unconventional natural gas produced water with positive energy production.

scholarly journals Regeneration of unconventional natural gas by methanogens co-existing with sulfate-reducing prokaryotes in deep shale wells in China

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Yimeng Zhang ◽  
Zhisheng Yu ◽  
Yiming Zhang ◽  
Hongxun Zhang
Keyword(s):  
Natural Gas ◽  
Produced Water ◽  
Gas Production ◽  
Biogenic Methane ◽  
Sulfate Reducing ◽  
Gas Recovery ◽  
Stable Isotopic ◽  
Unconventional Natural Gas ◽  
Acetoclastic Methanogenesis ◽  
Shale Reservoirs

Abstract Biogenic methane in shallow shale reservoirs has been proven to contribute to economic recovery of unconventional natural gas. However, whether the microbes inhabiting the deeper shale reservoirs at an average depth of 4.1 km and even co-occurring with sulfate-reducing prokaryote (SRP) have the potential to produce biomethane is still unclear. Stable isotopic technique with culture-dependent and independent approaches were employed to investigate the microbial and functional diversity related to methanogenic pathways and explore the relationship between SRP and methanogens in the shales in the Sichuan Basin, China. Although stable isotopic ratios of the gas implied a thermogenic origin for methane, the decreased trend of stable carbon and hydrogen isotope value provided clues for increasing microbial activities along with sustained gas production in these wells. These deep shale-gas wells harbored high abundance of methanogens (17.2%) with ability of utilizing various substrates for methanogenesis, which co-existed with SRP (6.7%). All genes required for performing methylotrophic, hydrogenotrophic and acetoclastic methanogenesis were present. Methane production experiments of produced water, with and without additional available substrates for methanogens, further confirmed biomethane production via all three methanogenic pathways. Statistical analysis and incubation tests revealed the partnership between SRP and methanogens under in situ sulfate concentration (~ 9 mg/L). These results suggest that biomethane could be produced with more flexible stimulation strategies for unconventional natural gas recovery even at the higher depths and at the presence of SRP.

scholarly journals Detecting and explaining why aquifers occasionally become degraded near hydraulically fractured shale gas wells

2018 ◽  
Vol 115 (49) ◽  
pp. 12349-12358 ◽  
Author(s):  
Josh Woda ◽  
Tao Wen ◽  
David Oakley ◽  
David Yoxtheimer ◽  
Terry Engelder ◽  
...  
Keyword(s):  
Natural Gas ◽  
Shale Gas ◽  
Noble Gas ◽  
Marcellus Shale ◽  
Temporal Trends ◽  
Gas Wells ◽  
Domestic Water ◽  
Upward Migration ◽  
Water Wells ◽  
Marcellus Formation

Extensive development of shale gas has generated some concerns about environmental impacts such as the migration of natural gas into water resources. We studied high gas concentrations in waters at a site near Marcellus Shale gas wells to determine the geological explanations and geochemical implications. The local geology may explain why methane has discharged for 7 years into groundwater, a stream, and the atmosphere. Gas may migrate easily near the gas wells in this location where the Marcellus Shale dips significantly, is shallow (∼1 km), and is more fractured. Methane and ethane concentrations in local water wells increased after gas development compared with predrilling concentrations reported in the region. Noble gas and isotopic evidence are consistent with the upward migration of gas from the Marcellus Formation in a free-gas phase. This upflow results in microbially mediated oxidation near the surface. Iron concentrations also increased following the increase of natural gas concentrations in domestic water wells. After several months, both iron and SO42− concentrations dropped. These observations are attributed to iron and SO42− reduction associated with newly elevated concentrations of methane. These temporal trends, as well as data from other areas with reported leaks, document a way to distinguish newly migrated methane from preexisting sources of gas. This study thus documents both geologically risky areas and geochemical signatures of iron and SO42− that could distinguish newly leaked methane from older methane sources in aquifers.

Relay ramps and rhombochasms in the northern Appalachian Basin: Extensional and strike-slip tectonics in the Marcellus Formation and Utica Group

AAPG Bulletin ◽  
2021 ◽  
Vol 105 (9) ◽  
pp. 2093-2124
Author(s):  
Robert Jacobi ◽  
Joel Starr ◽  
Craig Eckert ◽  
Charles Mitchell ◽  
Alan Leaves
Keyword(s):  
Appalachian Basin ◽  
Strike Slip ◽  
Marcellus Formation ◽  
Northern Appalachian Basin

Split Estate and Wyoming’s Orphaned Well Crisis: The Case of Coalbed Methane Reclamation in the Powder River Basin, Wyoming

2017 ◽  
Vol 1 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Kathryn Bills Walsh
Keyword(s):  
Natural Gas ◽  
River Basin ◽  
Technological Innovation ◽  
Coalbed Methane ◽  
Powder River Basin ◽  
Gas Wells ◽  
Mineral Rights ◽  
Split Estate ◽  
Legal Condition

This case presents the stakeholder conflicts that emerge during the development and subsequent reclamation of abandoned natural gas wells in Wyoming where split estate, or the separation of surface land and mineral rights from one another, occurs. From 1998 to 2008, the Powder River Basin of northeastern Wyoming experienced an energy boom as a result of technological innovation that enabled the extraction of coalbed methane (CBM). The boom resulted in over 16,000 wells being drilled in this 20,000 square-mile region in a single decade. As of May 2017, 4,149 natural gas wells now sit orphaned in Wyoming as a result of industry bankruptcy and abandonment. The current orphaned wells crisis was partially enabled by the patchwork of surface and mineral ownership in Wyoming that is a result of a legal condition referred to as split estate. As the CBM boom unfolded in this landscape and then began to wane, challenges emerged most notably surrounding stalled reclamation activities. This case illuminates these challenges highlighting two instances when split estate contributed to issues between landowners and industry operators which escalated to litigation.

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