Characterizing ocean basalt reservoirs for CO2 sequestration; ocean drilling and geophysical logging at DSDP/ODP/IODP Sites 1256 and 504

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Author(s): Slagle, A. L.; Goldberg, D.
Author Affiliation(s): Primary:
Lamont-Doherty Earth Observatory, Palisades, NY, United States
Volume Title: AGU 2011 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2011; American Geophysical Union 2011 fall meeting, San Francisco, CA, Dec. 5-9, 2011. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: In the face of rising atmospheric CO2 concentrations, sequestration of CO2 in ocean basalt reservoirs offers the potential for long-term storage in large, highly porous and permeable aquifers. Global assessments of ocean reservoirs suggest that the sediment-draped basalt flows along the flanks of mid-ocean ridges are promising sites for the injection and ultimate mineralization of CO2. These sites provide the additional advantages of gravity and hydrate trapping mechanisms that further reduce the risk of post-injection leakage. Ocean drilling and borehole logging in the eastern equatorial Pacific at Deep Sea Drilling Project/Ocean Drilling Program/Integrated Ocean Drilling Program Sites 1256 and 504 provide data with which to characterize and evaluate the shallow (upper 1 km) oceanic crust. In this study, we identify six distinct intervals at Sites 1256 and 504 as potential reservoirs, with new and reprocessed porosities as great as 14% and permeability estimates as high as 10-14 m2. High-resolution electrical resistivity images in these boreholes provide evidence of the lava types (dominantly fractured flows, breccias, and pillow basalts) as well as the structure of fracture networks and pore spaces that exist within these reservoirs. Calculations of potential carbon storage capacity, using specific reservoir thickness and new porosity estimates, indicate that ≈2,300 Gt-C could be stored as solid carbonate minerals in the combined reservoirs near Site 1256 and ≈1,400 Gt-C could be stored in the combined reservoirs near Site 504. Even the smallest of these reservoirs could provide storage capacity for decades of global carbon emissions. Further in situ hydrogeologic experimentation is required to test these estimates of porosity, permeability, and carbon storage capacity. Such studies would confirm the potential for future CO2 sequestration in these reservoirs and could be used to predict similar properties at other mid-ocean ridge sites.
Year of Publication: 2011
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 20 Geophysics, Applied; 22 Environmental Geology; Aquifers; Basalts; Carbon dioxide; Carbon sequestration; Carbonates; Concentration; Crust; DSDP Site 504; Deep aquifers; East Pacific; Ecology; Equatorial Pacific; Expedition 309; Expeditions 309/312; Greenhouse gases; Guatemala Basin; Hydrates; Igneous rocks; Injection; Integrated Ocean Drilling Program; Mid-ocean ridges; North Pacific; Northeast Pacific; ODP Site 1256; Ocean Drilling Program; Ocean floors; Oceanic crust; Pacific Ocean; Permeability; Reservoir rocks; Storage coefficient; Traps; Volcanic rocks; Well-logging
Coordinates: N064400 N064400 W0915600 W0915600
N011335 N011338 W0834348 W0834357
Record ID: 2014045313
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