Browsing NTNU Open by Author "Stovas, Alexey"
Now showing items 1-20 of 26
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An anelliptic approximation for geometrical spreading in transversely isotropic and orthorhombic media
Xu, Shibo; Stovas, Alexey; Sripanich, Yanadet (Journal article; Peer reviewed, 2018)The relative geometric spreading along the raypath contributes to the amplitude decay of the seismic wave propagation that needs to be considered for amplitude variation with offset or other seismic data processing methods ... -
Approximate reflection coefficients for a thin VTI layer
Hao, Qi; Stovas, Alexey (Journal article; Peer reviewed, 2018)We have developed an approximate method to derive simple expressions for the reflection coefficients of P- and SV-waves for a thin transversely isotropic layer with a vertical symmetry axis (VTI) embedded in a homogeneous ... -
Automated Log Data Analytics Workflow – The Value of Data Access and Management to Reduced Turnaround Time for Log Analysis
Torres Caceres, Veronica Alejandra; Duffaut, Kenneth; Westad, Frank Ove; Stovas, Alexey; Johansen, Yngve Bolstad; Jenssen, Arne Johannes Kaaijk (Peer reviewed; Journal article, 2022)The oil and gas industry of today is undergoing rapid digitalization. This implies a massive effort to transform standard work procedures and workflows into more efficient practices and implementations using machine learning ... -
AVO Analysis of the Upper Utsira Interface at the Sleipner Field during Fluid Substitution
Roverud, Kjetil (Master thesis, 2017)Higher concentration of carbon dioxide (CO2) in the atmosphere has contributed to increased interest in subsurface carbon capture and storage (CCS) projects. Geologic storage of CO2 re- quires careful prior studies of ... -
AVO Modelling and Attribute Analysis of the North-West Slope of the Fedynsky High in the Barents Sea
Novoselov, Artemii (Master thesis, 2017)The AVO modelling data is compared with the real seismic data. The data is acquired and seismic cubes are processed on Near, Mid, Far, Ultra and Full Stacks by Schlumberger as part of Statoil's order. Then the stratigraphy ... -
Effect of anelastic patchy saturated sand layers on the reflection and transmission responses of a periodically layered medium
Dupuy, Bastien; Stovas, Alexey (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 ... -
EFFECTIVE ANISOTROPY VERSUS FLUID SATURATION
Malembo, Chone Lugangizya (Master thesis, 2015)Anisotropy has proved to be a reliable means for determination of the rock properties necessary to characterize the subsurface. VTI is a form of anisotropy which provides an estimate of the layered earth. This report ... -
Effective Seismic model from Fractured rock
Shekhar, Ujjwal (Master thesis, 2021)Analyses of vertical fractures are of great interest in characterizing the fluid flow and minimum in situ stress direction in reservoirs. Fractures are responsible for permeability anisotropy in a reservoir. Fractures can ... -
Estimation of rock physics properties from seismic attributes - Part 2: Applications
Dupuy, Bastien; Garambois, Stéphane; Asnaashari, Amir; Balhareth, Hadi Mohammed; Landrø, Martin; Stovas, Alexey; Virieux, Jean (Journal article; Peer reviewed, 2016)The estimation of quantitative rock physics properties is of great importance for reservoir characterization and monitoring in CO2CO2 storage or enhanced oil recovery as an example. We have combined the high-resolution ... -
Freznel zone in VTI and orthorhombic media
Xu, Shibo; Stovas, Alexey (Journal article; Peer reviewed, 2017)The reflecting zone in the subsurface insonified by the first quarter of a wavelength and the portion of the reflecting surface involved in these reflections is called the Fresnel zone or first Fresnel zone. The horizontal ... -
Joint Rock Physics Inversion of Seismic and Electromagnetic Data for CO2 Monitoring at Sleipner
Adi Subagjo, Isa (Master thesis, 2018)The Carbon Capture and Storage project that is taking place at the Sleipner field involving the injection of CO2 into Utsira sandstone reservoir at 1012 m below sea level. The migration of CO2 must be monitored to understand ... -
Normal moveout velocity ellipses for the P-, S1-, and S2-waves in fractured media with monoclinic anisotropy
Luo, Zheng (Master thesis, 2022)Natural fractures are widely distributed in the upper crust. Fracture research is quite important in many fields. To understand the seismic signatures in fractured rocks, several classic effective models for fractured rocks ... -
Prediction of shale gas reservoirs using fluid mobility attribute driven by post-stack seismic data: A case study from Southern China
Zeng, Jing; Stovas, Alexey; Huang, H.; Ren, Lei; Tang, Tao (Peer reviewed; Journal article, 2021)Paleozoic marine shale gas resources in Southern China present broad prospects for exploration and development. However, previous research has mostly focused on the shale in the Sichuan Basin. The research target of this ... -
Processing of S-Wave Data in Orthorhombic Media
Jin, Song (Doctoral theses at NTNU;2020:296, Doctoral thesis, 2020) -
Reservoir Charecterization Based on S Waves Singularity directions
Rahnamay Moghaddam, Borhan (Master thesis, 2024)Reservoarkarakterisering er avgjørende for styring av hydrokarbonreservoarer. Nylige fremskritt legger vekt på verdien av å inkorporere skjæringsbølger, spesielt ved analyse av singularitetsretninger – retninger med unik ... -
S-wave kinematics in acoustic transversely isotropic media with a vertical symmetry axis
Song, Jin; Stovas, Alexey (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 ... -
Seismic Signature in Fractured Reservoir
Prasetyo, Ragil Destriawan (Master thesis, 2019)Anisotropy in large parts of the earth's crust, particularly in sedimentary basins is well modeled by orthorhombic (ORT) symmetry. Schoenberg and Helbig (1997) introduced the orthorhombic medium as a combination of vertical ... -
Seismic signatures of effective anisotropic media based on well-log data
Mursalli, Orkhan (Master thesis, 2023)Med utgangspunkt i masterspesialiseringsprosjektet TPG4570 ble denne masteroppgaverapporten skrevet. Noen teoretiske deler ble hentet fra fordypningsprosjektet, og det ble gitt referanser til delene som ble brukt. Målet ... -
Seismic signatures of fluid substitution in fractured media
Zhang, Yi (Master thesis, 2019)Seismic response to the fluid substitution of oil with water and CO2 in a reservoir is analysed. A model consisting of horizontal layers based on the upscaling of well log data is studied. An interval of the model is ... -
Seismic signatures of vertically fractured media
Zhang, Xingyu (Master thesis, 2019)Natural fractures are essential elements which can be commonly observed in reservoirs. The saying that "All reservoirs should be considered fractured until proven otherwise. (Narr et al., 2006)" is the best portrayal of ...