Depositional Environments Being Investigated by the National Energy Technology Laboratory (NETL) for Potential Geologic Storage of CO2
- Brian Dressel (National Energy Technology Laboratory) | David Kenneth Olsen (Intl Ctr - Heavy Hydrocarbons) | Bruce Brown (U.S. Department of Energy National Technology Lab) | Sean Plasynski (NETL) | John Litynski (NETL)
- Document ID
- Society of Petroleum Engineers
- SPE Eastern Regional Meeting, 13-15 October, Morgantown, West Virginia, USA
- Publication Date
- Document Type
- Conference Paper
- 2010. Society of Petroleum Engineers
- 6.5.3 Waste Management, 5.1.1 Exploration, Development, Structural Geology, 4.6 Natural Gas, 5.4.2 Gas Injection Methods, 5.1 Reservoir Characterisation, 1.2.3 Rock properties, 5.10.1 CO2 Capture and Sequestration, 4.3.4 Scale, 5.6.1 Open hole/cased hole log analysis, 6.5.1 Air Emissions, 5.4 Enhanced Recovery, 5.8.3 Coal Seam Gas, 1.6 Drilling Operations, 5.1.2 Faults and Fracture Characterisation, 6.5.7 Climate Change, 2.4.3 Sand/Solids Control, 4.1.5 Processing Equipment, 5.3.1 Flow in Porous Media, 1.2.2 Geomechanics
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A need exists for further research on carbon sequestration technologies to capture and store carbon dioxide (CO2) from stationary sources that would otherwise be emitted to the atmosphere. Carbon Capture and Storage (CCS) technologies have the potential to be a key technology for reducing CO2 emissions and mitigating global climate change.
Deploying these technologies on a commercial-scale will require geologic storage formations capable of (1) sequestering large volumes of CO2, (2) receiving CO2 at an efficient and economic rate of injection, and (3) retaining CO2 safely over extended periods. Eleven major types of depositional environments, each having their own unique opportunities and challenges, are being considered by the U.S. Department of Energy (DOE) for CO2 storage. These different classes of reservoirs include deltaic, coal/shale, fluvial, alluvial, strandplain, turbidite, eolian, lacustrine, clastic shelf, carbonate shallow shelf, and reef. Basaltic interflow zones are also being considered as potential reservoirs.
DOE has recently completed a study which investigates the geology, geologic reservoir properties and confining units, and geologic depositional systems of potential reservoirs and how enhanced oil recovery and coal bed methane are currently utilizing CO2. It looks at the classes of geologic formations that have been identified as having the potential to be CO2 reservoirs, their distribution and potential storage volumes.
This study also discusses the efforts that DOE is supporting to characterize and test small and large scale injections of CO2 into these different classes of reservoirs. These tests are important to better understand the directional tendencies imposed by the depositional environment that may influence how fluids flow within these systems today, and how CO2 in geologic sequestration is anticipated to flow in the future. Although diagenesis has modified fluid flow paths during the intervening millions of years since they were deposited, the basic architectural framework created during deposition remains. Geologic processes that are working today also existed when the sediments were initially deposited. Analysis of modern day depositional analogs, evaluation of core samples, outcrops and well logs from ancient subsurface formations give an indication of how formations were deposited and how fluid flow within these formations is anticipated to flow.
Further research on technologies to capture and store CO2 from stationary sources that would otherwise be emitted to the atmosphere is needed. Carbon Capture and Storage (CCS) has the potential to be a key technology for reducing CO2 emissions and mitigating global climate change.
According to the U.S. Environmental Protection Agency (EPA), total green house gas (GHG) emssions were estimated at 6,956.8 million metric tons CO2 equivalent in the United States in 2008. This estimate includes CO2 emissions, as well as other GHGs, such as methane (CH4), nitrous oxide (N2O), and hydrofluorocarbons (HFCs). Annual GHG emissions from fossil fuel combustion, primarily CO2, were estimated at 5,572 million metric tons, with 3,781 million metric tons from stationary sources,largely related to electrical power production. (DOE Carbon Sequestration Atlas of the United States and Canada, 2010).
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