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|a Offshore CO2 Storage Resource Assessment of the Northern Gulf of Mexico (Texas-Louisiana)
|h [electronic resource]
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|a Washington, D.C. :
|b United States. Office of the Assistant Secretary of Energy for Fossil Energy ;
|a Oak Ridge, Tenn. :
|b Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
|c 2019.
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|a Medium: ED :
|b digital, PDF file.
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|a text
|b txt
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|a computer
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|2 rdamedia.
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|a online resource
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|a Published through Scitech Connect.
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|a 11/26/2019.
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|a "doe-utexasaustin-fe0026083."
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|a Trevino, Ramon ; Meckel, Tip ;
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|a Univ. of Texas, Austin, TX (United States)
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|a Final Report AbstractThe objective of project was to conduct an offshore carbon storage resource assessment of the Gulf of Mexico, Texas ? Louisiana study area. This was accomplished by 1) assessing the carbon dioxide (CO2) storage capacity of depleted oil and natural gas reservoirs utilizing existing data (well logs, records and sample descriptions from existing or plugged/abandoned wells, available seismic surveys, existing core samples, and other available geologic and laboratory data) from historical hydrocarbon industry activities in the heavily explored portions of the inner continental shelf portions of the Texas and Louisiana Gulf of Mexico coastal areas; and 2) assessing the ability and capacity of saline formations in the region to safely and permanently store nationally-significant amounts of anthropogenic CO2 using existing data. The study identified at least one site with potential to store at least 30 million tonnes of CO2. The study also engaged the public and other stakeholders in the region through outreach activities to apprise them of the study objectives and results.Integrated analysis was performed on structural closures, fetch areas, existing fields, and fault maximum vertical displacement within the TexLa Merge 3D seismic area. Structural closures are mostly faulted anticlines and 3-way dip fault dependent closures. The integrity of the faults, or the closures in general, may be related to the column height of existing gas fields within the TXLA area. The 24-L and 10-L hydrocarbon fields provide ideal information for the relationship between fault integrity, juxtaposition, closures, and column height.A thorough search through the digital and written records of the BEG core archives at two of the BEG?s core repositories (i.e., Austin and Houston) yielded seven available cores close to the study area, four of which are offshore and three onshore. Two of the cores from West Cameron, Louisiana offshore, were studied in detail. The results show that the mudstone intervals of the Lower Miocene in the West Cameron area are consistent in terms of petrographic and petrographic properties through the depth of investigation. The sealing performance should be excellent for the studied intervals.In addition to analyzing core samples from seal intervals, the availability of an HR3D dataset in the project study area provided the opportunity to investigate the macro-scale properties of the geologic overburden including potential seal and non-seal facies, shallow structure and potential natural fluid flow (migration) pathways. In order to analyze potential fluid pathways in the HR3D dataset, a technique known as diffraction imaging was tested. Analysis of diffraction energy associated with a gas chimney identified on other HR3D datasets (i.e., in the San Luis Pass, TX area) improved confidence in the interpretation of active fluid migration in the GoM2014 dataset and thus provided higher confidence for using diffraction seismic techniques as a tool where fluid migration is not as easily identifiable using standard seismic attributes.Regional static capacity was estimated using the methodology of Wallace et al. (2014), which was, in turn, a modification and refinement of the methodology of Goodman et al. (2011). The static capacity for the analyzed High Island 24L Field area was estimated to be 7.15 gigatonnes (Gt). Maximum and minimum computed storage values were 4.66 and 0.75 Mt/km2 (megatonnes per square kilometer), respectively. Average and standard deviation were 2.55 Mt/km2 and 0.75 Mt/km2, respectively. For the Miocene section of the prospective interval, ?tot (total porosity) varies from 30% to 33%, and CO2 density ranges from 640 to 700 kg/m3.The calculated P50 storage volume for the High Island 24L Field using the 3-D porosity model is approximately 190 million metric tonnes (Mt). A similar analysis using NETL?s CO2-SCREEN tool results in an estimate of 170 Mt. The CO2-SCREEN result is 20 Mt less than the Goodman et al. (2011) calculated capacity because the former works in a 2-D space as the hydrocarbon footprint area had to be split into 15 equal square grid blocks, and it was not able to capture the entire area. Nonetheless, these values are relatively close, and they are significant in that they equal much more than the current project?s 30 Mt minimum objective.Results from the EASiTool screening indicate that the total CO2 storage capacity of the reservoirs of the analyzed fields is up to ̃197 million metric tonnes. We consider this to be a conservative estimate, as the reservoir area required as input for EASiTool was derived from known cumulative production from the studied reservoirs, which constrains the available volume for CO2 storage. In subtask 4.2, we used the EASiTool capacity calculator to assess the dynamic CO2 storage capacities of the same oil and gas fields that were selected and analyzed in subtask 4.1.A cumulative distribution function of estimated CO2 storage capacities in the offshore TXLA study area shows that storage capacities across the region are not normally distributed. Fifty percent of the reservoirs have storage capacities of 1.5 million tonnes or less, meaning that the 50% probability is significantly lower than the average storage capacity (2.8285 million tonnes), with a standard deviation of 3.2881 million tonnes. Ninety percent of the reservoirs have capacities of 7.5 million tonnes or less.
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|b FE0026083.
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|a 58 geosciences
|2 local.
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|a 54 environmental sciences
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|a 02 petroleum
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|a 03 natural gas
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|a 29 energy planning, policy, and economy
|2 local.
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|a Gulf of mexico
|2 local.
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|a Co2
|2 local.
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|a Sequestration
|2 local.
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|a Capacity
|2 local.
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|a Geologic characterization
|2 local.
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|a Et al
|2 local.
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|a United States. Office of the Assistant Secretary of Energy for Fossil Energy.
|4 spn.
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information
|4 dst.
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|u https://www.osti.gov/servlets/purl/1575411
|z Full Text (via OSTI)
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|b 06-23-21
|c 06-23-21
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