• From Static to Dynamic Stiffness of Shales: Frequency and Stress Dependence 

      Lozovyi, Serhii; Bauer, Andreas (Peer reviewed; Journal article, 2019)
      The relation between static and dynamic stiffness in shales is important for many engineering applications. Dynamic stiffness, calculated from wave velocities, is often related to static stiffness through simple empirical ...
    • The impact of saturation on seismic dispersion in shales — Laboratory measurements 

      Szewczyk, Dawid; Holt, Rune Martin; Bauer, Andreas (Peer reviewed; Journal article, 2018)
      Previous studies found a significant increase of acoustic velocities between seismic and ultrasonic frequencies (seismic dispersion) for shales, which would have to be taken into account when comparing seismic or sonic ...
    • Offset dependence of overburden time-shifts from ultrasonic data 

      Bakk, Audun; Holt, Rune Martin; Bauer, Andreas; Dupuy, Bastien; Romdhane, Mohamed Anouar (Peer reviewed; Journal article, 2020)
      Depletion or injection into a reservoir implies stress changes and strains in the reservoir and its surroundings. This may lead to measurable time-shifts for seismic waves propagating in the subsurface. To better understand ...
    • Reactive instabilities in linear acidizing on carbonates 

      Papamichos, Euripides; Strongylis, Polyneikis; Bauer, Andreas (Peer reviewed; Journal article, 2020)
      Acid injection, reactive instabilities and wormholing in carbonate reservoirs is investigated through the analysis of the linear acidizing problem theoretically and experimentally. Theoretically acidizing was analyzed by ...
    • Velocity dispersion in rocks: A laboratory technique for direct measurement of P-wave modulus at seismic frequencies 

      Lozovyi, Serhii; Bauer, Andreas (Peer reviewed; Journal article, 2019)
      Fluid saturated rocks exhibit a dependence of acoustic velocities on frequency, which is called velocity dispersion. For some rocks, e.g., shales, velocity dispersion is rather strong and has to be taken into account when ...