Jack C. Pashin¹, Richard H. Groshong², Richard E. Carroll¹

(1) Geological Survey of Alabama, Tuscaloosa, AL
(2) The University of Alabama, Tuscaloosa, AL

ABSTRACT: Enhanced Coalbed Methane Recovery through Sequestration of Carbon Dioxide: Potential for a Market-based Environmental Solution in the Black Warrior Basin

Sequestration of carbon dioxide in coal can reduce atmospheric greenhouse gas emissions while increasing coalbed methane recovery, yet the sequestration capacity of coal basins has yet to be quantified. Furthermore, screening criteria need to be established to select demonstration sites. With the support of the U.S. Department of Energy, we have initiated a study of the sequestration potential of the Black Warrior coalbed methane fairway of Alabama, where two large coal-fired power plants operate adjacent to a thriving coalbed gas industry. The objectives of this research are to develop a screening model that is transferable to other basins and to identify areas where sequestration technology can be demonstrated.

Experience from 20 years of coalbed methane development provides a wealth of knowledge that can be used to quantify sequestration potential and develop a screening model that is broadly applicable. The geologic variables controlling sequestration potential are essentially the same as those controlling producibility. Geology, technology, and infrastructure are the key variables being used to develop the screening model. Critical geologic concerns include reservoir volume, reservoir continuity, and permeability. Emerging technologies to be considered include carbon dioxide separators for flue gas and enhanced gas recovery technology. Proximity to power plants, pipeline systems, coalbed methane field design, and the locations of underground coal mines and their reserve areas are all elements of infrastructure that must also be incorporated into the screening model. Through implementation of this model, effective decisions can be made for the demonstration and implementation of carbon sequestration technology.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado