Co <inf>2</inf> Sequestration Potential of Texas Low-Rank Coals

Fossil fuel consumption is a primary source of CO 2, a major greenhouse gas. Geologic methods, such as injection and sequestration of CO 2 in coals may offer viable methods of reducing CO 2 atmospheric emissions, while providing the added benefit of enhanced coalbed methane recovery. The potential for CO 2 sequestration in low-rank coals is unknown, and it differs significantly from bituminous coals. To evaluate the feasibility and the environmental, technical, and economic impacts of CO 2 sequestration in Texas low-rank coal beds, we are conducting a 2-year study to characterize the coals located near major electrical power plants. We have identified potential of CO 2 sequestration sites in coals near 3 Texas power plants. These 3 power plants discharge 34,068,751 short tons of CO 2 annually, accounting for 14.6% of Texas' point-source emissions. On the basis of preliminary modeling of one site, using assumed permeability, CO 2 storage and methane content values, we conclude that 360 wells on 80-acre spacing could sequester CO 2 emissions for the Gibbons Creek plant for 11 years, while producing 180 Bcf of coalbed methane. However, reservoir properties are poorly known and, thus, the volumes of CO 2 that may be sequestered and the amount of methane that may be produced are speculative at present. Future study will focus on better reservoir characterization and additional modeling.

Co 2 Sequestration Potential of Texas Low-Rank Coals Conference Paper