Blar i NTNU Open på forfatter "Bauer, Andreas"
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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 ... -
Anisotropic poroelasticity – Does it apply to shale?
Holt, Rune Martin; Bakk, Audun; Bauer, Andreas (Journal article; Peer reviewed, 2018)Shale plays an important role as cap rock above oil and gas reservoirs and above e.g. CO2 storage sites, as well as being source and reservoir rock in development of so-called unconventional reserves. Shale anisotropy needs ... -
Can Heating Induce Borehole Closure?
Xie, Xiyang; Bauer, Andreas; Stenebråten, Jørn; Bakheim, Sigurd; Lavrov, Alexandre; Fjær, Erling; Kristiansen, Tron Golder (Peer reviewed; Journal article, 2020)The current study shows that heating a cased borehole in low-permeability shale rock can induce plastic deformation, leading to the closure of the casing annulus and decreasing annulus connectivity. The thermally induced ... -
The capacity of creeping shale to form an annular barrier
Brendsdal, Are Olav Eriksen (Master thesis, 2017)This report was written in Pau, France, as part of an internship in Total E&P Drilling & Wells Division, Geomechanics Entity, under supervision of Kun Su. Shale displacing inwards in the wellbore is a well-recognized ... -
The Effect of Partial CO2 Saturation on the Elastic Properties of Castlegate Sandstone Measured at Seismic and Ultrasonic Frequencies
Massaad, Jack (Master thesis, 2016)The Oil & Gas industry started to tackle the problem of CO2 emissions through subsurface storage in depleted reservoir formations. Such are the cases of the Sleipner West Field in the North Sea (Eiken, Brevik et al. 2000), ... -
Elastic to Non-Elastic Rock Deformation Studied by Combination of Static and Dynamic Measurements - Investigating the Behaviour of the Non-Elastic Response
Sirevaag, Tore Lie (Master thesis, 2016)Tidligere studier gjort på ren sandstein under reduksjon av spenning fra et vendepunkt, viser en lineær tendens for den ikke-elastiske inverse stivheten. Ved å anvende denne lineære oppførselen til steinen kan man ekstrapolere ... -
Experimental Studies of Stress Dependence,Static vs Dynamic behaviour and Mechanical Anisotropies of Shale
Holt, Rune Martin; Bakk, Audun; Bauer, Andreas; Fjær, Erling; Stenebråten, Jørn (Chapter, 2014)Laboratory data from controlled rock mechanical tests with various shales have been used to understand and quantify stress effects on wave velocities of relevance for 4D seismics, and to quantify the difference between ... -
Fracture Treatment Simulations Using a Modified Discrete Element Model (MDEM)
Baastad, Andreas (Master thesis, 2016)Hydraulic fracturing is a widely used well-stimulation technique and one of the primary engineering tools for enhanced well productivity. To improve the understanding of how untouched rock mass reacts to stimulation, SINTEF ... -
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
Rørheim, Stian (Doctoral theses at NTNU;2022:52, Doctoral thesis, 2022) -
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 ... -
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 ... -
Numerical modeling of fracture initiation using plasticity models
Gebus, Bernardo (Master thesis, 2018)Nowadays hydraulic fracturing is a key part of the oil and gas industry to enhance the field's production. Therefore, is important to understand how fractures initiate and how to extract important information from them for ... -
Numerical Simulation of Extended Leak-Off Tests
Eide, Vegard Veiteberg (Master thesis, 2014)In-situ stresses are key information for well and formation integrity assessments, especially in difficult drilling operations such as high pressure high temperature wells, extended reach wells and in-fill drilling. During ... -
Offset dependence of overburden time-shifts from ultrasonic data
Bakk, Audun; Holt, Rune Martin; Bauer, Andreas; Dupuy, Bastien; Romdhane, Mohamed Anouar (Journal article; Peer reviewed, 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 ... -
Offset-Dependent Overburden Time-Shifts from Ultrasonic Data
Bakk, Audun; Holt, Rune Martin; Bauer, Andreas; Dupuy, Bastien; Romdhane, Mohamed Anouar (Chapter, 2019)Depletion or injection into a reservoir implies stress and strain changes in the reservoir and its surroundings. This may lead to measurable time-shifts for seismic waves propagating in the subsurface. We have measured ... -
On the Effect of CO2 on Seismic and Ultrasonic Properties: A Novel Shale Experiment
Rørheim, Stian; Bhuiyan, Mohammad Hossain; Bauer, Andreas; Cerasi, Pierre (Peer reviewed; Journal article, 2021)Carbon capture and storage (CCS) by geological sequestration comprises a permeable formation (reservoir) for CO2 storage topped by an impermeable formation (caprock). Time-lapse (4D) seismic is used to map CO2 movement in ... -
Overburden geomechanical effects on 4D seismic response - influences of stiffness contrast, anisotropy, and geometry
Li, Liming; Bauer, Andreas; Holt, Rune Martin; Fjær, Erling; Stenebråten, Jørn; Bakk, Audun (Journal article; Peer reviewed, 2014)Petroleum production and CO2 storage induce effective stress changes and deformations in the reservoir, as well as in the overburden. This may be detected by 4D seismic monitoring due to the stress-sensitivity of the seismic ... -
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) ...