| Autor: |
Ruppert, Leslie F., Jubb, Aaron M., Headen, Thomas F., Youngs, Tristan G.A., Bandli, Bryan |
| Zdroj: |
Energy & Fuels; March 2020, Vol. 34 Issue: 3 p2765-2771, 7p |
| Abstrakt: |
The Near and InterMediate Range Order Diffractometer (NIMROD) was used to examine the potential impact of shale mineralogy on CO2behavior within micropores. Two samples with varying mineral compositions were obtained from producing intervals in the dry gas window in the Middle Devonian Marcellus Shale. One of the samples contained relatively high amounts of quartz and clay and low carbonate, the other contained relatively equal amounts of quartz, carbonate, and clay. The samples were probed with CO2at subcritical pressures (20–50 bar) and temperature (22 °C) and characterized over a neutron scattering vector (Q) range of 0.02 < Q< 50 Å–1. This Qrange provides information from the atomistic length-scale up to pore radii of 10 nm. Mineralogy variations between the samples did not affect scattering ratios over the entire Qrange accessible with the NIMROD. Qvalues for the minimum scattering ratios of both samples at similar pressures are remarkably similar, particularly for Q< ∼0.09 Å–1, and maximum scattering ratios are similar in both samples suggesting that mineral pores are so uncommon in the pore sizes examined that they cannot be resolved due to the overwhelming amounts of organic pores in these samples. Overall, these findings suggest that mineralogical variations have little effect on CO2behavior within organic matter-hosted shale micropores at high thermal maturities and they lend support to the assertion that CO2cannot be stored in the vast surface areas of micropores in organic material in shale formations. In addition, CO2enhanced oil recovery (EOR) is unlikely to displace petroleum from some of the smaller mesopores (2.5 to ∼3.5 nm) and all of the micropores because they are effectively closed to CO2. |
| Databáze: |
Supplemental Index |
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