Blar i NTNU Open på forfatter "Holt, Rune Martin"
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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 ... -
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 ... -
Overburden pore-pressure changes and their influence on 4D seismic
Holt, Rune Martin; Bauer, Andreas Kurt Marcel; Bakk, Audun (Journal article; Peer reviewed, 2017)Changes in seismic two-way travel time in the overburden can be attributed to pore pressure changes in the underlying reservoir. Since cap rock permeability is very small, these stress changes occur without drainage on ... -
Practical applications of elastic anisotropy in rock physics, rock mechanics, and seismic subsurface characterization
Asaka, Michinori (Doctoral theses at NTNU;2022:145, Doctoral thesis, 2022)Elastic response of rocks often depends on the rock’s orientation, i.e., most rocks are anisotropic. In particular, shales, which are the overburden rock in most of conventional oil and gas fields, often show strong elastic ... -
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) ... -
Rock physics model of shale: Predictive aspect
Asaka, Michinori; Holt, Rune Martin; Bakk, Audun (Peer reviewed; Journal article, 2021)Shales often show strong elastic anisotropy that originate from the alignment and platy nature of its constituent minerals. Despite its impact on AVO (Amplitude Variation with Offset) response and seismic time-shifts, ... -
Seismic Dispersion in Pierre Shale
Gu, Hanxue (Master thesis, 2015)In applied geophysics, there is a trend to progress from a qualitative interpretation towards a quantitative interpretation.4D seismic (time-lapse seismic) is a common tool used in reservoir characterization, by which we ... -
Shale Rock Physics and AVO - Saturation and Pressure Effects on Shale Anisotrpic AVO
Alghenaim, Hamad (Master thesis, 2015)AVO sensitivity analysis was performed on Mancos Shale data to study the effect of stress and saturation on shale reservoirs. All the data was collected for seismic and ultrasonic frequencies and dispersion seem to be an ... -
Skempton's A – A key to man-induced subsurface pore pressure changes
Holt, Rune Martin; Bakk, Audun; Stenebråten, Jørn; Bauer, Andreas; Fjær, Erling (Chapter, 2018)Fluid production from or injection into a subsurface reservoir leads to stress pressure changes inside and outside the reservoir. The overburden often consists of low permeability shale, and the undrained pore pressure ... -
SPE-174356-MS Effect of Rock Anisotropy on Integrated Modelling
Li, Liming; Bakk, Audun; Fjær, Erling; Bauer, Andreas; Stenebråten, Jørn; Holt, Rune Martin (Chapter, 2015)Associated with reservoir monitoring towards optimizing production of oil and gas and maximizing the recovery, or ensuring safe CO2 storage, it may be beneficial to introduce integrated geomechanics, rock physics and seismic ... -
Spotfire: A new workflow of stress visualization for Statoil Rock Mechanics Department, combined with interpretations of minimum horizontal stress data from the Norwegian Continental Shelf
Ekkje, Sigurd (Master thesis, 2013)For many years it has been performed formation stress tests (FST) on the Norwegian Continental Shelf (NCS). These tests are performed for estimating the formation strength in wells. More strict regulations for well integrity ... -
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 ... -
Stress Path Dependent Velocities in Shales: Impact on 4D Seismic Interpretation
Holt, Rune Martin; Bauer, Andreas; Bakk, Audun (Journal article; Peer reviewed, 2018)Overburden stresses and pore pressure are altered by depletion or inflation of a subsurface reservoir, leading to seismic travel time and reflectivity changes that may be interpreted as footprints of reservoir drainage or ... -
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 ... -
Stress sensitivity of velocities in anisotropic rocks - Rock models comparison and true-triaxial apparatus description
Duda, Marcin (Master thesis, 2017)The purpose of this study was to investigate the effects of anisotropy on elastic parameters of rocks, and to compare various types of anisotropic rock models with the use of ultrasonic data obtained with a true-triaxial ... -
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 ... -
The Importance of Overburden Stress Path in Assessment of Stress Dependence for 4D Applications
Holt, Rune Martin; Bauer, Andreas Kurt Marcel; Bakk, Audun (Chapter, 2016)