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  1. AU="Melissa M. Mills"
  2. AU="Goli, Haneesha"
  3. AU="Viviana Falcón-Cama"
  4. AU="Januschek, Friederike"
  5. AU="Bonilla-Aldana, D. Katterine"
  6. AU="Stix, Michael S"
  7. AU="Xiao, Bing"
  8. AU="Algattas, Hanna N"
  9. AU="Ihm, M"
  10. AU="Nivelo, Luis A"
  11. AU="Nirja Kaka"
  12. AU="Bahnă, Adriana Florina"
  13. AU="Wen, Changchun"
  14. AU="Nizami, Sarea Islam Nuha"
  15. AU="Douglas J Kelly"
  16. AU=Kingston Elizabeth V
  17. AU="Jyoti Nepal"
  18. AU="González, Ana M Martín"

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  1. Artikel ; Online: Parameter estimation from spontaneous imbibition into volcanic tuff

    Kristopher L. Kuhlman / Melissa M. Mills / Jason E. Heath / Matthew J. Paul / Jennifer E. Wilson / John Eric Bower

    Vadose Zone Journal, Vol 21, Iss 2, Pp n/a-n/a (2022)

    2022  

    Abstract: Abstract Two‐phase fluid flow properties underlie quantitative prediction of water and gas movement, but constraining these properties typically requires multiple time‐consuming laboratory methods. The estimation of two‐phase flow properties (van ... ...

    Abstract Abstract Two‐phase fluid flow properties underlie quantitative prediction of water and gas movement, but constraining these properties typically requires multiple time‐consuming laboratory methods. The estimation of two‐phase flow properties (van Genuchten parameters, porosity, and intrinsic permeability) is illustrated in cores of vitric nonwelded volcanic tuff using Bayesian parameter estimation that fits numerical models to observations from spontaneous imbibition experiments. The uniqueness and correlation of the estimated parameters is explored using different modeling assumptions and subsets of the observed data. The resulting estimation process is sensitive to both moisture retention and relative permeability functions, thereby offering a comprehensive method for constraining both functions. The data collected during this relatively simple laboratory experiment, used in conjunction with a numerical model and a global optimizer, result in a viable approach for augmenting more traditional capillary pressure data obtained from hanging water column, membrane plate extractor, or mercury intrusion methods. This method may be useful when imbibition rather than drainage parameters are sought, when larger samples (e.g., including heterogeneity or fractures) need to be tested that cannot be accommodated in more traditional methods, or when in educational laboratory settings.
    Schlagwörter Environmental sciences ; GE1-350 ; Geology ; QE1-996.5
    Thema/Rubrik (Code) 310
    Sprache Englisch
    Erscheinungsdatum 2022-03-01T00:00:00Z
    Verlag Wiley
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel ; Online: Model representations of kerogen structures

    Philippe F. Weck / Eunja Kim / Yifeng Wang / Jessica N. Kruichak / Melissa M. Mills / Edward N. Matteo / Roland J.-M. Pellenq

    Scientific Reports, Vol 7, Iss 1, Pp 1-

    An insight from density functional theory calculations and spectroscopic measurements

    2017  Band 8

    Abstract: Abstract Molecular structures of kerogen control hydrocarbon production in unconventional reservoirs. Significant progress has been made in developing model representations of various kerogen structures. These models have been widely used for the ... ...

    Abstract Abstract Molecular structures of kerogen control hydrocarbon production in unconventional reservoirs. Significant progress has been made in developing model representations of various kerogen structures. These models have been widely used for the prediction of gas adsorption and migration in shale matrix. However, using density functional perturbation theory (DFPT) calculations and vibrational spectroscopic measurements, we here show that a large gap may still remain between the existing model representations and actual kerogen structures, therefore calling for new model development. Using DFPT, we calculated Fourier transform infrared (FTIR) spectra for six most widely used kerogen structure models. The computed spectra were then systematically compared to the FTIR absorption spectra collected for kerogen samples isolated from Mancos, Woodford and Marcellus formations representing a wide range of kerogen origin and maturation conditions. Limited agreement between the model predictions and the measurements highlights that the existing kerogen models may still miss some key features in structural representation. A combination of DFPT calculations with spectroscopic measurements may provide a useful diagnostic tool for assessing the adequacy of a proposed structural model as well as for future model development. This approach may eventually help develop comprehensive infrared (IR)-fingerprints for tracing kerogen evolution.
    Schlagwörter Medicine ; R ; Science ; Q
    Thema/Rubrik (Code) 541
    Sprache Englisch
    Erscheinungsdatum 2017-08-01T00:00:00Z
    Verlag Nature Portfolio
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

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