Blar i Department of Earth Science på tidsskrift "Geophysics"

Viser treff 1-4 av 4

    • A complex point-source solution of the acoustic eikonal equation for Gaussian beams in transversely isotropic media 

      Huang, Xingguo; Sun, Hui; Sun, Zhangqing; da Silva, Nuno (Peer reviewed; Journal article, 2020-03-11)
      The complex traveltime solutions of the complex eikonal equation are the basis of inhomogeneous plane-wave seismic imaging methods, such as Gaussian beam migration and tomography. We present the analytic approximations for ...

    • Diagnostics of seismic time-lapse effects of sandstones based on laboratory data 

      Moyano, Bernardo; Johansen, Tor Arne; Agersborg, Remy; Spikes, Kyle Thomas (Peer reviewed; Journal article, 2014-09)
      We evaluated a viscoelastic modeling of P- and S-wave velocity dispersion, attenuation, pressure, and fluid effects for a set of siliciclastic rock samples. Our analysis used a published laboratory data set of 63 sandstones ...

    • Estimation of elastic moduli of mixed porous clay composites 

      Jensen, Erling Hugo; Andersen, Charlotte Faust; Johansen, Tor Arne (Peer reviewed; Journal article, 2011-01-13)
      We have developed a procedure for estimating the effec­tive elastic properties of various mixtures of smectite and kaolinite over a range of confining pressures, based on the individual effective elastic properties of pure ...

    • Modeling compaction effects on the elastic properties of clay-water composites 

      Moyano, Bernardo; Spikes, Kyle Thomas; Johansen, Tor Arne; Mondol, Nazmul Haque (Peer reviewed; Journal article, 2012-09)
      Modeling the elastic properties of clay-bearing rocks (shales) requires thorough knowledge of the mineral constituents, their elastic properties, pore space microstructure, and orientations of clay platelets. Information ...