Browsing NTNU Open by Author "Szewczyk, Dawid"
Now showing items 1-9 of 9
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A new laboratory apparatus for the measurement of seismic dispersion under deviatoric stress conditions
Szewczyk, Dawid; Bauer, Andreas; Holt, Rune Martin (Journal article; Peer reviewed, 2016)A better understanding of seismic dispersion and attenuation of acoustic waves in rocks is important for quantitative interpretation of seismic data, as well as for relating seismic data, sonic-log data, and ultrasonic ... -
Frequency dependent elastic properties of shales – Impact of partial saturation and stress changes
Szewczyk, Dawid (Doctoral theses at NTNU;2017:151, Doctoral thesis, 2017)Shales are the most common constituent of the overburden of conventional hydrocarbon reservoirs. As such, they have a strong influence on seismic waves and knowledge about overburden mechanical properties is required for ... -
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 ... -
Influence of subsurface injection on time-lapse seismic: laboratory studies at seismic and ultrasonic frequencies
Szewczyk, Dawid; Holt, Rune Martin; Bauer, Andreas (Journal article; Peer reviewed, 2018)Seismic monitoring of reservoir and overburden performance during subsurface CO2 storage plays a key role in ensuring efficiency and safety. Proper interpretation of monitoring data requires knowledge about the rock physical ... -
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 ... -
Relating Static and Dynamic Mechanical Anisotropies of Shale
Holt, Rune Martin; Bauer, Andreas; Fjær, Erling; Stenebråten, Jørn; Szewczyk, Dawid; Horsrud, Per (Chapter, 2015)Experimental studies of shale cores of different orientations have been performed to compare the angular dependence of dynamic moduli acquired at ultrasonic frequencies with static moduli (Young’s moduli and Poisson ratios) ... -
Stress-dependent elastic properties of shales—laboratory experiments at seismic and ultrasonic frequencies
Szewczyk, Dawid; Bauer, Andreas; Holt, Rune Martin (Journal article; Peer reviewed, 2018)Knowledge about the stress sensitivity of elastic properties and velocities of shales is important for the interpretation of seismic time-lapse data taken as part of reservoir and caprock surveillance of both unconventional ... -
Stress-path dependence of ultrasonic and seismi velocities in shale
Holt, Rune Martin; Bauer, Andreas Kurt Marcel; Bakk, Audun; Szewczyk, Dawid (Journal article, 2016)4D seismic time-shifts are induced by stress changes in the overburden as a result of depletion from or injection into an underlying reservoir. This represents a powerful technique for tracking unrecovered hydrocarbon ... -
The impact of saturation on seismic dispersion in shales — Laboratory measurements
Szewczyk, Dawid; Holt, Rune Martin; Bauer, Andreas (Journal article; Peer reviewed, 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 ...