Browsing NTNU Open by Author "Lozovyi, Serhii"

Now showing items 1-10 of 10

    • Effect of non-linear elasticity on stress paths in depleted reservoirs and their surroundings 

      Lozovyi, Serhii; Yan, Hong; Holt, Rune Martin; Bakk, Audun (Chapter, 2020)
      The prediction of stress and strain changes in and around reservoir using numerical simulators is often based on assumption of linear elasticity before reaching yield point. However, it is known that rocks are generally ...

    • Experimental study of seismic dispersion: Influence of clay mineral content 

      Mews, Kim Sarah; Lozovyi, Serhii; Stenebråten, Jørn; Giger, Silvio B.; Holt, Rune Martin (Journal article; Peer reviewed, 2023)
      We conducted an extensive study on the elastic properties of Opalinus Clay and the overlying and underlying rock formations, which range in the overall clay mineral content from nearly 0 wt.% to 60 wt.%. Our laboratory ...

    • Frequency-dependent wave velocities in sediments and sedimentary rocks: Laboratory measurements and evidences 

      Bauer, Andreas; Bhuiyan, Mohammad Hossain; Fjær, Erling; Holt, Rune Martin; Lozovyi, Serhii; Pohl, Mathias; Szewczyk, Dawid (Journal article; Peer reviewed, 2016)
      The pioneering work of Mike Batzle and his colleagues has provided a fundamental understanding of mechanisms behind dispersion and attenuation of elastic waves in fluid-saturated rocks. It also has made way for a realization ...

    • 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 ...

    • Non-elastic effects in static and dynamic rock stiffness 

      Lozovyi, Serhii; Sirevaag, Tore Lie; Szewczyk, Dawid; Bauer, Andreas Kurt Marcel; Fjær, Erling (Chapter, 2017)
      The static stiffness of a rock is generally smaller than its dynamic stiffness, which, for non-dispersive rocks, is due to a difference in strain amplitude in compaction tests (quasi-static) and wave-velocity measurements ...

    • Seismic Dispersion and the Relation between Static and Dynamic Stiffness of Shales 

      Lozovyi, Serhii (Doctoral theses at NTNU;2018:182, Doctoral thesis, 2018)
      The main focus of this work is on the characterisation of the static and dynamic elastic properties of overburden shales by laboratory experiments; some of the studies were additionally conducted on sandstones. The work ...

    • Static and Dynamic Characterization of a Deep Overburden Shale 

      Bakk, Audun; Stenebråten, Jørn; Lozovyi, Serhii; Bauer, Andreas; Sønstebø, Eyvind Frode; Fjær, Erling; Bhuiyan, Mohammad Hossain; Chakraborty, Samarjit; Holt, Rune Martin (Chapter, 2018)
      Since shales are the far most abundant overburden formation, understanding the geomechanical and rock physics behavior of shales is essential. We discuss a particular deep overburden shale in light of a thorough static and ...

    • Static and dynamic stiffness measurements with Opalinus Clay 

      Lozovyi, Serhii; Bauer, Andreas (Journal article; Peer reviewed, 2018)
      In this work, an experimental study was carried out with the aim of reconciling static and dynamic stiffness of Opalinus Clay. The static and dynamic stiffness of core plugs from a shaly and a sandy facies of Opalinus Clay ...

    • Stress paths and predicted time-shifts around a depleting reservoir 

      Yan, Hong; Bakk, Audun; Holt, Rune Martin; Lozovyi, Serhii (Chapter, 2020)
      Time-lapse (4D) seismic is an essential tool for monitoring the subsurface in and around producing hydrocarbon or CO2 storage reservoirs. The seismic time-shifts, in the reservoir as well as in the overburden, depend on ...

    • 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 have to be taken into ...