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Geochemistry of CO (sub 2) sequestration in the Jurassic Navajo Sandstone, Colorado Plateau, Utah

W. T. Parry, Craig B. Forster, J. P. Evans, Brenda Beitler Bowen and Marjorie A. Chan
Geochemistry of CO (sub 2) sequestration in the Jurassic Navajo Sandstone, Colorado Plateau, Utah
Environmental Geosciences (June 2007) 14 (2): 91-109


The Jurassic Navajo Sandstone on the Colorado Plateau of Utah may be considered for sequestration of CO (sub 2) , because it is thick, widely distributed, has a high porosity and permeability, is typically horizontal to gently folded, is favorably located with respect to seal strata, and underlies many large point sources of CO (sub 2) . However, faulting common on the Colorado Plateau may provide pathways for leakage of the CO (sub 2) similar to present-day geysers and CO (sub 2) -charged springs. Natural groundwater present in the Navajo Sandstone includes a range of low-salinity, moderate-salinity with high bicarbonate, and high-salinity waters. Higher salinity waters may have moved from deeper strata under artesian pressures or originated from solution of evaporite in pre-Jurassic rocks. These characteristics make the Navajo Sandstone an excellent analog for examining the geochemistry of CO (sub 2) injection into deep saline aquifers. The storativity of CO (sub 2) in solution is a function of the solubility of CO (sub 2) in these waters, which is dependent on salinity, temperature, and pressure. Geochemical modeling shows that the coolest, least saline water can contain the most CO (sub 2) in solution. Dissolving CO (sub 2) in the water lowers the pH, so that no minerals precipitate, and the Navajo Sandstone contains only small amounts of mineral that may consume the H (super +) . The reaction of the acidic water produced by dissolving CO (sub 2) with K-feldspar and minor clays and calcite in the sandstone throughout 500 yr consumes little H (super +) and produces only small amounts of product minerals. The Navajo Sandstone likely would not store significant CO (sub 2) as mineral precipitate, and thus, stored volumes of CO (sub 2) would be limited by its solubility in the in-situ water and storage as free CO (sub 2) in pore space.

ISSN: 1075-9565
EISSN: 1526-0984
Serial Title: Environmental Geosciences
Serial Volume: 14
Serial Issue: 2
Title: Geochemistry of CO (sub 2) sequestration in the Jurassic Navajo Sandstone, Colorado Plateau, Utah
Affiliation: University of Utah, Department of Geology and Geophysics, Salt Lake City, UT, United States
Pages: 91-109
Published: 200706
Text Language: English
Publisher: American Association of Petroleum Geologists (AAPG), Division of Environmental Geosciences, Tulsa, OK, United States
References: 85
Accession Number: 2007-084707
Categories: Environmental geologyGeneral geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
N37°00'00" - N40°30'00", W114°00'00" - W109°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 200739
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