Carbon dioxide sequestration in the Campine Basin and the adjacent Roer Valley Graben (North Belgium): an inventory
B. Laenen, P. Van Tongeren, R. Dreesen, M. Dusar, 2004. "Carbon dioxide sequestration in the Campine Basin and the adjacent Roer Valley Graben (North Belgium): an inventory", Geological Storage of Carbon Dioxide, Shelagh J. Baines, Richard H. Worden
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The Campine Basin offers a variety of potential CO2 storage sites. Within the Roer Valley Graben area Triassic Buntsandstein rocks have an estimated CO2 storage capacity of several hundred million tons. Mesozoic shales and younger sediments provide adequate sealing. Westphalian D sandstones may possess storage opportunities in the southern graben area, and the karstified/dolomitized parts of the Dinantian carbonates in the western sub-basin have an estimated CO2 storage capacity of 130 × 106 tons. In places, the Dinantian reservoirs may be combined with carbonate reservoirs in the underlying Devonian strata. Sealing is provided by Namurian shales and Westphalian coals and shales. Along the western and southern edge of the basin the Dinantian reservoir is sealed by Cretaceous chalks and marls.
Besides aquifers, the available coal qualifies for CO2 storage. Six Six methane target areas contain a producible enhanced coalbed methane (ECBM), volume of 53–79 × 109m3. This provides a minimum CO2 sequestration potential of 400 × 106 tons. ECBM development factors include the sedimentological setting of the coal sequence as well as changes in porosity, permeability and stress conditions induced by former mining activities. The CO2 storage capacity in abandoned coalmines is limited. Nevertheless, CO2 storage in the abandoned mines may be an option when it is combined with coalmine methane extraction or ECBM production in neighbouring areas.
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Carbon dioxide (CO2) is the main compound identified as affecting the stability of the Earth’s climate. A significant reduction in the volume of greenhouse gas emissions to the atmosphere is a key mechanism for mitigating climate change. Geological storage of CO2, or the injection and long-term stabilization of large volumes of CO2 in the subsurface in saline aquifers, in existing hydrocarbon reservoirs or in unmineable coal seams, is one of the more technologically advanced options available. A number of studies have been carried out and are reported here. They are aimed at understanding the safety, physical and chemical behaviour and long-term fate of CO2 when stored in geological formations. Until efficient, alternative energy options can be developed, geological storage of CO2, the subject of this volume, provides a mechanism to reduce carbon emissions significantly whilst continuing to meet the global demand for energy.