Assessing Emissions from Active and Abandoned Coal Mines Active
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.
Carbon and Energy Storage, Emissions and Economics (CESEE)
Economics of Energy Transitions
Geologic Energy Storage
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
- 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.
Carbon and Energy Storage, Emissions and Economics (CESEE)
Carbon Dioxide (CO2) is utilized by industry to enhance oil recovery. Subsurface CO2 storage could significantly impact reduction of CO2 emissions to the atmosphere, but the economics and potential risks associated with the practice must be understood before implementing extensive programs or regulations. Utilization of other energy-related gases such as helium (He), if separated and concentrated...Economics of Energy Transitions
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
The United States (U.S.) domestic energy supply increasingly relies on natural gas and renewable sources; however, their efficient use is limited by supply and demand constraints. For example, a) in summer, natural gas production may outpace home heating fuel demand and b) in daytime, wind and solar electricity production may outpace industrial power requirements. Storing rather than dumping...Induced Seismicity Associated with Carbon Dioxide Geologic Storage
As a national science agency, the USGS is responsible for assessing hazards from earthquakes throughout the United States. The USGS studies induced seismicity across the spectrum of energy issues: carbon sequestration, geothermal energy, and conventional and unconventional oil and gas. In the central and eastern United States, earthquakes induced by fluid injection activities contribute...Geologic Carbon Dioxide and Energy-related Storage, Gas Resources, and Utilization
The objectives of this task are to conduct relevant research needed to 1) evaluate helium (He) and CO2 resources; 2) support future assessments of low-thermal gases and better understand their resources and potential for use as analogues for anthropogenic CO2 storage; 3) study the feasibility of large-scale CO2 mineralization in the United States; 4) develop pressure-limited dynamic models for...Methodology Development and Assessment of National Carbon Dioxide Enhanced Oil Recovery and Associated Carbon Dioxide Storage Potential
The objective of this research task is to conduct a national assessment of recoverable oil related to CO2 injection. The amount of CO2 stored (utilized) during the hydrocarbon recovery process will also be evaluated. - Multimedia
- Publications