The gas emission zone liberates and accumulates significant amounts of coal mine methane as a by-product of active mining. In most active mines, coal mine methane is controlled by wellbores, called gob gas ventholes. Despite the presence of these wellbores, it is not possible to capture all of the methane generated within the gas emission zone. As a consequence, a large amount of gas migrates into the mine and is exhausted to the atmosphere with ventilation air. Eventually, part of the gas generated during mining stays in the emission zone, and with additional emissions, becomes abandoned mine methane after the panels are sealed or the mines are abandoned completely. Abandoned mines that are sealed properly may become gas reservoirs from which methane can be extracted and utilized by available technologies. Capturing and utilizing coal mine and abandoned mine methane can alleviate the harmful effects of methane emissions to the atmosphere and can provide an energy resource through use of the recovered gas. Assessment of coal mine emissions and capturing methane also help to ensure the safety of coal mines.
A technical barrier to economical utilization of coal mine and abandoned mine methane is the uncertainty about how much methane may be available in the gas emission zone as a resource during mining, as well as after the panels are sealed and the mine is abandoned. Another difficulty is estimating how much of the potential methane resource can be produced from gob gas ventholes converted to capture abandoned mine methane. Coal mine and abandoned mine methane resource assessments and overcoming these difficulties require knowledge of geology, panel layout, production wells, ventilation fans, and availability of different data types and data sources. A reliable assessment methodology for gas emission zone and to quantify coal mine methane and abandoned mine methane emissions and their resource potential does not currently exist.
Objectives
The objective of this research is to better predict and assess methane emissions from coal mine sites by taking into account geologic, hydrologic, engineering, and operational factors through a collaborative effort with national and international partners.
Methodology
For selected coal mines, a geologic framework will be developed for the gas emission zone to quantify emission sources and their contribution to coal mine methane and abandoned mine methane. Available geologic and site-specific data may be avialble from USGS.
This task involves selecting a coal mine and developing a geologic framework for defining the gas emission zone to quantify emission sources and their contribution to coal mine methane and abandoned mine methane. Available geologic and site-specific data will be gathered from USGS, U.S. Environmental Protection Agency (EPA), State Geological Surveys, and Mine Safety and Health Administration (MSHA) databases. Based on mine and geological characteristics, the characteristic size of the emission zone for each coal mining basin will be defined. By using software tools and the coal resource maps, the emission sources within the gas emission zones will be defined and quantified for their contribution to coal mine and abandoned mine methane potentials.
How to Participate
If your company or organization would like to participate in this research effort, please contact one of the project scientists listed at the side of this page for more information.
Potential national and international collaborators and direct beneficiaries of this research effort are coal and gas companies, universities and research establishments, EPA, U.S. Department of Energy (DOE), U.S. Energy Information Administration (EIA), National Institute for Occupational Safety and Health (NIOSH), MSHA, and State Geological Surveys, as well as United Nations Economic Commission for Europe (UNECE), Commonwealth Scientific and Industrial Research Organization (CSIRO), International Energy Agency (IEA), European Union (EU) Commission, and other international organizations in coal-producing countries where active and abandoned mines are located and that are interested in preventing release of coal mine methane and abandoned mine methane due to their greenhouse gas potential.
Useful Links
Methane Control and Prediction Software
Coal Mine Methane Review Paper
Below are other science projects associated with this research.
Utilization of Carbon and other Energy Gases - Geologic Research and Assessments
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Induced Seismicity Associated with Carbon Dioxide Geologic Storage
Geologic Carbon Dioxide and Energy-related Storage, Gas Resources, and Utilization
Methodology Development and Assessment of National Carbon Dioxide Enhanced Oil Recovery and Associated Carbon Dioxide Storage Potential
Below are multimedia items associated with this project task.
Below are publications associated with this research.
Predicting methane emissions and developing reduction strategies for a Central Appalachian Basin, USA, longwall mine through analysis and modeling of geology and degasification system performance
Insights on the characteristics and sources of gas from an underground coal mine using compositional data analysis
Assessment of coal mine methane (CMM) and abandoned mine methane (AMM) resource potential of longwall mine panels: example from Northern Appalachian Basin, USA
- Overview
The gas emission zone liberates and accumulates significant amounts of coal mine methane as a by-product of active mining. In most active mines, coal mine methane is controlled by wellbores, called gob gas ventholes. Despite the presence of these wellbores, it is not possible to capture all of the methane generated within the gas emission zone. As a consequence, a large amount of gas migrates into the mine and is exhausted to the atmosphere with ventilation air. Eventually, part of the gas generated during mining stays in the emission zone, and with additional emissions, becomes abandoned mine methane after the panels are sealed or the mines are abandoned completely. Abandoned mines that are sealed properly may become gas reservoirs from which methane can be extracted and utilized by available technologies. Capturing and utilizing coal mine and abandoned mine methane can alleviate the harmful effects of methane emissions to the atmosphere and can provide an energy resource through use of the recovered gas. Assessment of coal mine emissions and capturing methane also help to ensure the safety of coal mines.
A technical barrier to economical utilization of coal mine and abandoned mine methane is the uncertainty about how much methane may be available in the gas emission zone as a resource during mining, as well as after the panels are sealed and the mine is abandoned. Another difficulty is estimating how much of the potential methane resource can be produced from gob gas ventholes converted to capture abandoned mine methane. Coal mine and abandoned mine methane resource assessments and overcoming these difficulties require knowledge of geology, panel layout, production wells, ventilation fans, and availability of different data types and data sources. A reliable assessment methodology for gas emission zone and to quantify coal mine methane and abandoned mine methane emissions and their resource potential does not currently exist.
Objectives
The objective of this research is to better predict and assess methane emissions from coal mine sites by taking into account geologic, hydrologic, engineering, and operational factors through a collaborative effort with national and international partners.
Methodology
For selected coal mines, a geologic framework will be developed for the gas emission zone to quantify emission sources and their contribution to coal mine methane and abandoned mine methane. Available geologic and site-specific data may be avialble from USGS.
This task involves selecting a coal mine and developing a geologic framework for defining the gas emission zone to quantify emission sources and their contribution to coal mine methane and abandoned mine methane. Available geologic and site-specific data will be gathered from USGS, U.S. Environmental Protection Agency (EPA), State Geological Surveys, and Mine Safety and Health Administration (MSHA) databases. Based on mine and geological characteristics, the characteristic size of the emission zone for each coal mining basin will be defined. By using software tools and the coal resource maps, the emission sources within the gas emission zones will be defined and quantified for their contribution to coal mine and abandoned mine methane potentials.
How to Participate
If your company or organization would like to participate in this research effort, please contact one of the project scientists listed at the side of this page for more information.
Potential national and international collaborators and direct beneficiaries of this research effort are coal and gas companies, universities and research establishments, EPA, U.S. Department of Energy (DOE), U.S. Energy Information Administration (EIA), National Institute for Occupational Safety and Health (NIOSH), MSHA, and State Geological Surveys, as well as United Nations Economic Commission for Europe (UNECE), Commonwealth Scientific and Industrial Research Organization (CSIRO), International Energy Agency (IEA), European Union (EU) Commission, and other international organizations in coal-producing countries where active and abandoned mines are located and that are interested in preventing release of coal mine methane and abandoned mine methane due to their greenhouse gas potential.
Useful Links
Methane Control and Prediction Software
Coal Mine Methane Review Paper
- Science
Below are other science projects associated with this research.
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This task conducts research to characterize or evaluate the economics of developing technologies or markets in geologic resources. Such research can analyze the relative risks, costs, and benefits from the utilization and not just the extraction of underground resource. Economic analysis builds upon the geologic resource assessment work by other tasks in the Utilization of Carbon and other Energy...Geologic Energy Storage
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Below are multimedia items associated with this project task.
- Publications
Below are publications associated with this research.
Predicting methane emissions and developing reduction strategies for a Central Appalachian Basin, USA, longwall mine through analysis and modeling of geology and degasification system performance
Coal mine methane is a safety concern in active mines due to explosion risk and an environmental concern due to the greenhouse gas (GHG) properties of methane emissions to the atmosphere. Depending on the mine design and operation, structural and stratigraphic characteristics of the geology, and the properties of coal beds affected by mining, a significant amount of methane can be released duringAuthorsC. Özgen KaracanInsights on the characteristics and sources of gas from an underground coal mine using compositional data analysis
Coal mine gas originates from the gas emission zone (GEZ) of the mine, as well as the longwall face and pillars. Gas emissions are controlled directly at the sources using horizontal or vertical boreholes drilled from surface or from the entries in advance of mining, or it is captured from the fractured and caved zones (gob) using ventholes during mining. The rest of the gas, especially that gas tAuthorsC. Özgen Karacan, Josep Antoni Martín-Fernández, Leslie F. Ruppert, Ricardo A. OleaAssessment of coal mine methane (CMM) and abandoned mine methane (AMM) resource potential of longwall mine panels: example from Northern Appalachian Basin, USA
"Coal mine methane (CMM) and abandoned mine methane (AMM), are by-products of underground coal mining. The quantity and the emission rate of CMM and AMM may vary depending on the type of mine, gas content of the mined coal seam, and gas sourced from strata and coal beds in overlying and underlying formations affected by mining. Therefore, if a mine has the potential of accumulating gas after beingAuthorsC. Özgen Karacan, Peter D. Warwick