Summary Water-rock reactions are critical to the short- and long-term storage of injected CO2. Ca... more Summary Water-rock reactions are critical to the short- and long-term storage of injected CO2. Carbonate- CO2-fluid reactions releases CO2 while silicate-CO2-fluid reactions potentially store CO2 in the fluid and as newly formed carbonates. The detailed, quantitative mineralogy of the Weyburn reservoir is described in the context of flow units as defined by the operator of the Weyburn Field, EnCana Resources Ltd. Detailed, quantitative mineralogy is also presented for the units that overly the Weybrun Reservoir. Storage calculations show that even in a carbonte reservoir such as Weybrun, there are sufficient silicate minerals to provide long term storage of CO2 by reaction with silicates. Also, overlying units that represent a wide array of rock types have the capacity to store CO2 that might escape from the reservoir.
Carbon capture and geological storage is a potential technology to reduce CO2 emissions into the ... more Carbon capture and geological storage is a potential technology to reduce CO2 emissions into the atmosphere from fossil fuel intensive industries. Monitoring of CO2 storage sites is required by many of the emerging regulations with specific interest in accounting of injected CO2 in various target reservoirs including saline aquifers. We have used chemical data and carbon and oxygen isotope ratios of produced water and gases sampled repeatedly from various observation wells to: a) trace the movement of injected CO2, b) assess pore space saturation with CO2 and c) develop an approximate carbon budget for the Pembina Cardium CO2 Monitoring Project in central Alberta, Canada. The distinct carbon isotope ratios of injected CO2 in association with gas compositional and flux data were used to determine the percentage of injected CO2 produced at several observation wells using two endmember mixing calculations. Changes of 18O values of produced water by up to 4 h were caused by oxygen isoto...
Natural gas emanations are part of the geochemical baseline to take into account when assessing g... more Natural gas emanations are part of the geochemical baseline to take into account when assessing global greenhouse gas emissions and potential impacts of conventional and unconventional gas exploration and exploitation on groundwater. Examples of such natural gas macro-seeps are known in several parts of the world (Etiope et al., 2009). Only a limited number of them have been characterized for their gas and isotopic compositions. Such analyses can provide essential information for baseline studies, providing insight in the sources (biogenic vs. ther-mogenic or modified thermogenic) and pathways of such seeps and may allow for distinction of natural seeps from stray gas leakage associated with human activities. Here, we report gas concentrations and multi-isotope data (δ 13 C and δ 2 H of methane and ethane, δ 13 C and δ 18 O of CO 2 , 3 He/ 4 He ratio) of two gas seeps in the French subalpine chains, both in a similar geological and structural position within Middle Jurassic clayston...
Summary Molecular and isotopic analyses of oil samples from Athabasca, Peace River and Cold Lake ... more Summary Molecular and isotopic analyses of oil samples from Athabasca, Peace River and Cold Lake oil sands reservoirs in Alberta, Canada, were conducted to evaluate the effect of biodegradation processes on the molecular and isotopic compositions of these oils. The results indicate that all studied samples are affected by biodegradation to different degrees. Based on the molecular composition, the levels of biodegradation range from at least PM5 to PM8 in Athabasca, PM5 to PM6 in Peace River and PM4 or lower at Cold Lake. Increasing levels of oil biodegradation from top to bottom of the oil columns was observed everywhere. Biodegradation does not cause observable systematic carbon, nitrogen or sulfur isotope changes vertically in whole bitumen columns; however, some 32 S-enriched oils found locally may reflect secondary sulphur incorporation related to local microbial activity. Major differences in the sulfur and nitrogen isotopic composition of oils across the province are suggeste...
Summary Water-rock reactions are critical to the short- and long-term storage of injected CO2. Ca... more Summary Water-rock reactions are critical to the short- and long-term storage of injected CO2. Carbonate- CO2-fluid reactions releases CO2 while silicate-CO2-fluid reactions potentially store CO2 in the fluid and as newly formed carbonates. The detailed, quantitative mineralogy of the Weyburn reservoir is described in the context of flow units as defined by the operator of the Weyburn Field, EnCana Resources Ltd. Detailed, quantitative mineralogy is also presented for the units that overly the Weybrun Reservoir. Storage calculations show that even in a carbonte reservoir such as Weybrun, there are sufficient silicate minerals to provide long term storage of CO2 by reaction with silicates. Also, overlying units that represent a wide array of rock types have the capacity to store CO2 that might escape from the reservoir.
Carbon capture and geological storage is a potential technology to reduce CO2 emissions into the ... more Carbon capture and geological storage is a potential technology to reduce CO2 emissions into the atmosphere from fossil fuel intensive industries. Monitoring of CO2 storage sites is required by many of the emerging regulations with specific interest in accounting of injected CO2 in various target reservoirs including saline aquifers. We have used chemical data and carbon and oxygen isotope ratios of produced water and gases sampled repeatedly from various observation wells to: a) trace the movement of injected CO2, b) assess pore space saturation with CO2 and c) develop an approximate carbon budget for the Pembina Cardium CO2 Monitoring Project in central Alberta, Canada. The distinct carbon isotope ratios of injected CO2 in association with gas compositional and flux data were used to determine the percentage of injected CO2 produced at several observation wells using two endmember mixing calculations. Changes of 18O values of produced water by up to 4 h were caused by oxygen isoto...
Natural gas emanations are part of the geochemical baseline to take into account when assessing g... more Natural gas emanations are part of the geochemical baseline to take into account when assessing global greenhouse gas emissions and potential impacts of conventional and unconventional gas exploration and exploitation on groundwater. Examples of such natural gas macro-seeps are known in several parts of the world (Etiope et al., 2009). Only a limited number of them have been characterized for their gas and isotopic compositions. Such analyses can provide essential information for baseline studies, providing insight in the sources (biogenic vs. ther-mogenic or modified thermogenic) and pathways of such seeps and may allow for distinction of natural seeps from stray gas leakage associated with human activities. Here, we report gas concentrations and multi-isotope data (δ 13 C and δ 2 H of methane and ethane, δ 13 C and δ 18 O of CO 2 , 3 He/ 4 He ratio) of two gas seeps in the French subalpine chains, both in a similar geological and structural position within Middle Jurassic clayston...
Summary Molecular and isotopic analyses of oil samples from Athabasca, Peace River and Cold Lake ... more Summary Molecular and isotopic analyses of oil samples from Athabasca, Peace River and Cold Lake oil sands reservoirs in Alberta, Canada, were conducted to evaluate the effect of biodegradation processes on the molecular and isotopic compositions of these oils. The results indicate that all studied samples are affected by biodegradation to different degrees. Based on the molecular composition, the levels of biodegradation range from at least PM5 to PM8 in Athabasca, PM5 to PM6 in Peace River and PM4 or lower at Cold Lake. Increasing levels of oil biodegradation from top to bottom of the oil columns was observed everywhere. Biodegradation does not cause observable systematic carbon, nitrogen or sulfur isotope changes vertically in whole bitumen columns; however, some 32 S-enriched oils found locally may reflect secondary sulphur incorporation related to local microbial activity. Major differences in the sulfur and nitrogen isotopic composition of oils across the province are suggeste...
Chemical compositions and stable isotope ratios of water and sulphate were used to characterise s... more Chemical compositions and stable isotope ratios of water and sulphate were used to characterise sources and processes responsible for elevated concentrations of sulphate and other constituents in groundwater from aquifers at Colima State along Mexico’s Pacific Coast. The δ18O and δ2H values of the groundwater were similar to those of precipitation indicating a meteoric origin, and recharge processes are relatively uniform in large parts of the study area with only slight local evaporation effects. δ34Ssulphate and δ18Osulphate analyses indicated that high sulphate concentrations of up to 1,480 mg/l are mainly due to dissolution of evaporites and volcanic exhalations. Chloride is largely related to sources other than seawater. The Marabasco sub basin is affected by anthropogenic contamination through manganese and iron ore mining activities. The obtained knowledge regarding sources and areas of contamination will be essential for the development and design of a water quality monitoring program in the study area.
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