Blar i Fakultet for ingeniørvitenskap (IV) på tidsskrift "Geophysical Prospecting"
Viser treff 1-13 av 13
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A new laboratory apparatus for the measurement of seismic dispersion under deviatoric stress conditions
(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 ... -
Automated well log depth matching: Late fusion multimodal deep learning
(Peer reviewed; Journal article, 2022)Petrophysical interpretation and optimal correlation extraction of different measurements require accurate well log depth matching. We have developed a supervised multimodal machine learning alternative for the task of ... -
CO2 saturation estimates at Sleipner (North Sea) from seismic tomography and rock physics inversion
(Journal article; Peer reviewed, 2018)CO2 saturations are estimated at Sleipner using a two‐step imaging workflow. The workflow combines seismic tomography (full‐waveform inversion) and rock physics inversion and is applied to a two‐dimensional seismic line ... -
Effect of anelastic patchy saturated sand layers on the reflection and transmission responses of a periodically layered medium
(Journal article; Peer reviewed, 2016)Based on analytic relations, we compute the reflection and transmission responses of a periodically layered medium with a stack of elastic shales and partially saturated sands. The sand layers are considered anelastic ... -
Influence of subsurface injection on time-lapse seismic: laboratory studies at seismic and ultrasonic frequencies
(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 ... -
Integrating rock physics laboratory data and modelling to improve uplift characterization methodology
(Peer reviewed; Journal article, 2020)Modelling changes in elastic wave velocities in sediments and rocks as they undergo burial and uplift can reveal aspects of their burial history. This has implications in the petroleum risking procedures, as aspects such ... -
Offset dependence of overburden time-shifts from ultrasonic data
(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 ... -
On occurrence of point singularities in orthorhombic media
(Journal article; Peer reviewed, 2019)Degeneracies of the slowness surfaces of shear (and compressional) waves in low‐symmetry anisotropic media (such as orthorhombic), known as point singularities, pose difficulties during modelling and inversion, but can be ... -
Relations between Static and Dynamic Moduli of Sedimentary Rocks
(Journal article; Peer reviewed, 2018)Static moduli of rocks are usually different from the corresponding dynamic moduli. The ratio between them is generally complex and depends on several conditions, including stress state and stress history. Different drainage ... -
Retrieving virtual reflection responses at drill-bit positions using seismic interferometry with drill-bit noise
(Journal article; Peer reviewed, 2016)In the field of seismic interferometry, researchers have retrieved surface waves and body waves by cross-correlating recordings of uncorrelated noise sources to extract useful subsurface information. The retrieved wavefields ... -
S-wave kinematics in acoustic transversely isotropic media with a vertical symmetry axis
(Journal article; Peer reviewed, 2018)Acoustic transversely isotropic models are widely used in seismic exploration for P‐wave processing and analysis. In isotropic acoustic media only P‐wave can propagate, while in an acoustic transversely isotropic medium ... -
Static and dynamic stiffness measurements with Opalinus Clay
(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 ... -
Third-order elasticity of transversely isotropic field shales
(Peer reviewed; Journal article, 2023)The formations above a producing reservoir can exhibit large mechanical changes, creating a risk of significant subsidence and loss of rock integrity. These changes can be monitored by time-lapse seismic acquisition, which ...