s. sharma , m. mulder, a. sack , l. bowman & t. carrend-member characterization of natural gas...
TRANSCRIPT
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S. Sharma , M. Mulder, A. Sack , L. Bowman & T. Carr
K. Schroeder & R. Hammack
J. White & D. Chambers
West Virginia University
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Colorless & Odorless
Flammable
Explosive range: 5-15%
Solubility in water : 26-32 mg/l
Baldassare & Laughrey , 1997
Problems: Fires; Explosions; Asphyxiation; Groundwater Contamination
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West Virginia University
SAMPLED GW AQUIFERS
Dunkard Gp.
Monongahela Gp.
Conemaugh Gp.
Allegheny Fm.
Pottsville Gp.
Greenbrier Gp.
Pocono Gp.
Hampshire Fm.
Chemung Gp.
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Landfills, Swamps and Marshes
Microbial gas in shallow aquifers
Abandoned & operating coal Mines
Gas storage fields
Gas pipelines
Abandoned & operating gas wells
Source: ISOTECH
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BIOGENIC
Bacterial gas
ACETATE FERMENTATION
CH3COOH → CH4 + CO2
Near surface environment- Landfill, Marsh etc.
CO2 REDUCTION
CO2 + 4H2 → CH4 + 2H2O
Drift gas from deeper formations
THERMOGENIC
Coal bed & Natural gas
ABIOGENIC
Crustal & mantle gas
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(Hunt , 1996)
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Modified Graphs from Neiman 2002
d13C (‰) = (13C/12Csample / 13C/12Cstandard - 1) • 1000 dD (‰) = (2H/1Hsample / (
2H/1Hstandard - 1) • 1000
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GW methane data : • MS thesis of M. Mulder Methane data : • Marcellus & Shallow Devonian Sands (samples
collected) • Ordovician & Silurian gases (published literature)
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Stable isotopic signatures and gas geochemistry can be used to
Identify possible sources of methane in groundwater aquifers and surface waters
Identify changes in hydrological connections
Essential criterion to be met:
Good understanding of baseline and temporal variations in gas concentrations and isotopic signatures
Well established dissolved gas sampling protocols
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End-member characterization of natural gas in formations overlying Marcellus, active/in-active coal mines, microbial gas in shallow subsurface in southern Pennsylvania and north central West Virginia
Assess effect of sampling methodologies on isotopic and molecular compositions of dissolved gases sampled using different techniques
Test applicability of stable isotopes and gas composition to identify changes in hydrologic connections related to hydraulic fracturing.
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• URS -DOE National Technology Laboratory
• US Geological Survey
• West Virginia Water Research Institute
• USGS West Virginia Water Science Center