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@ARTICLE{Weller:20815,
      author       = {Weller, A. and Breede, K. and Slater, L. and Nordsiek, S.},
      title        = {{E}ffect of changing water salinity on complex conductivity
                      spectra of sandstones},
      journal      = {Geophysics},
      volume       = {76},
      issn         = {0016-8033},
      address      = {Tulsa, Okla.},
      publisher    = {SEG},
      reportid     = {PreJuSER-20815},
      pages        = {F315 - F327},
      year         = {2011},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We analyzed the influence of pore fluid composition on the
                      complex electrical conductivity of three sandstones with
                      differing porosity and permeability. The fluid electrical
                      conductivity (sigma(w)) of sodium and calcium chloride
                      solutions was gradually increased from 25 mS/m to 2300 mS/m.
                      The expected linear relation between sigma(w) and the real
                      component of electrical conductivity (sigma') of the
                      saturated samples was observed. The imaginary component
                      (sigma '') exhibits a steeper increase at lower salinities
                      that flattens at higher salinities. For a glauconitic
                      sandstone and a high porosity Bunter sandstone, sigma ''
                      approaches an asymptotic value at high salinities. Sodium
                      cations result in larger values of sigma '' than calcium
                      cations in solutions of equal concentration. Debye
                      decomposition was used to determine normalized chargeability
                      (m(n)) and average relaxation time (tau) from spectral data.
                      The behavior of sigma '' is comparable to m(n) as both
                      parameters measure the polarizability. At lower salinity,
                      the relation between m(n) and sigma(w) approximates a power
                      law with an exponent of similar to 0.5. The average
                      relaxation time shows only a weak dependence on sigma(w).
                      The normalized chargeability of sandstone samples can be
                      described by the product of the pore space related internal
                      surface and a quantity characterizing the polarizability of
                      the mineral-fluid interface that depends on fluid chemistry.
                      We introduce a new parameter, the specific polarizability,
                      describing this dependence. We propose relations between
                      polarizability and fluid chemistry that could be used to
                      estimate pore space internal surface across samples of
                      varying sigma(w). We observe a consistent maximum
                      polarizability for quartz dominated siliceous material.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Geochemistry $\&$ Geophysics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000297946200014},
      doi          = {10.1190/geo2011-0072.1},
      url          = {https://juser.fz-juelich.de/record/20815},
}