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Quantifying Fluid‐Wettable Effective Pore Space in the Utica and Bakken Oil Shale Formations
Author(s) -
Zhang Yuxiang,
Hu Qinhong,
Barber Troy J.,
Bleuel Markus,
Anovitz Lawrence M.,
Littrell Kenneth
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl087896
Subject(s) - oil shale , porosity , carbonate , characterisation of pore space in soil , mineralogy , geology , organic matter , clay minerals , chemical engineering , materials science , geotechnical engineering , chemistry , organic chemistry , paleontology , engineering , metallurgy
Combined (ultra‐) small angle neutron scattering measurements [(U)SANS] and a contrast matching technique were employed to quantify the porosity and pore size distribution from 1 nm to 10 μm and to differentiate accessible (open) pores and inaccessible (closed) pores with respect to organophilic and hydrophilic fluids for two Utica and two Bakken shale samples. The results indicate that around 40–70% of the pores in the Utica oil shales (mixed carbonate mudstone) are accessible to oil, and 34–37% of the pore surfaces are water‐wet. In contrast, the Bakken oil shales (mixed siliceous mudstone and carbonate/siliceous mudstone), which have high total organic carbon contents, have a higher proportion of isolated pore space that is not preferentially wet by oil or water, with less than 36% of the pores accessible to both fluids. In addition, for both formations, pores less than 3 nm in diameter are not oil accessible (organic matter related) but water accessible (clay tactoids related).