Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"Fracture Density"”.
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Seismic scattering attributes to estimate reservoir fracture density : a numerical modeling study
… to generate synthetic seismograms from a simple fractured reservoir containing evenly-spaced, discrete, vertical fracture zones. The fracture zones are represented using a single column of anisotropic grid points. In our experiments, we vary the spacing of the fracture zones from 10-meters to …
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Seismic characterization of fractured reservoirs (part I) ; Crustal deformation in the Tibetan Plateau (part II)
… of using P-waves to investigate properties of fractured reservoirs and the diagnostic ability of the P-wave seismic data to detect fractures. The objectives of this thesis are threefold: (1) to identify the effects of fracture parameters and background media on the NMO velocities and azimuthal …
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Fracture-enhanced porosity and permeability trends in the Bakken Formation, Williston Basin, western North Dakota
<p> Fractures play a critical role in oil production from the Bakken Formation (Devonian and Mississippian) in the North Dakota portion of the Williston Basin. The Bakken Formation in the study area is known for its low matrix porosity and permeability, high organic content, thermal maturity, and …
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Time-lapse seismic AVAz in the Stocker Field
… to be economically productive. Zones of high fracture density are desired due to the increase in permeability they would have. Thus, fracture characterization is an essential part of production planning in unconventional reservoirs. Amplitude Variation with Offset and Azimuth (AVAz) …
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Anisotropy, focal mechanisms, and state of stress in an oilfield : passive seismic monitoring in Oman
… of the spatial characteristics of stress and fractures in reservoirs is important for optimising production and injection processes. Serni-permanent passive microseismic monitoring is being conducted in the Yibal field, Oman, to better understand reservoir geomechanics. The network comprises …
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The effects of fluid pressure changes on fractured rock elastic moduli and surface deformation
… These moduli may change with pressure and fracture density, but this effect is usually left out of models. This work shows effective elastic moduli of fluid-filled fractured rock through a self consistent method. The calculated effective elastic moduli for a penny-shaped crack are compared …
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Effects of Hurricane Fault Architecture on Groundwater Flow in the Timpoweap Canyon of Southwestern, Utah
… zone, by contrast, consists of small faults and fracture networks, which can act as conduits. Timpoweap Canyon near Hurricane, Utah has superb exposures of the fault core and damage zone of the Hurricane Fault. Also within the canyon, springs discharge from the damage zone into the Virgin River, …
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Fault-Controlled Damage and Permeability at the Brady Geothermal System, Nevada, U.S.A.
… with complex distributions of secondary fractures, with variable attitude, fracture density, and connectivity – all of which can influence permeability. Simulations of the local stress state due to slip on a detailed model of the fault system at Brady Geothermal Field, NV, supported by …
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Fluid flow through connected sub-seismic features in mudstone
… a series of conjugate faults and an associated fracture network; the faults have a maximum recorded throw of 10m i.e. at the limit of typical industry seismic surveys. Field data show evidence for two distinct flow episodes; carbonate-filled veins and green alteration halos. Flow utilised a …
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Evaluation of diagnostic fracture injection test (DFIT) and rate transient analysis (RTA) in Hereford field, northern DJ Basin
… of pore space, pore connectivity, and natural fracture density in such reservoirs. Because of the flow dominance of fractures—natural and from well stimulation, these reservoirs are categorized as dual-porosity reservoirs. The two interacting pore channels are called matrix and fractures. …
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Structural Controls of the San Emidio Geothermal System, Northwestern Nevada
… suggest that north-northeast striking faults and fractures are favorably oriented for fluid flow under west-northwest-directed extension. The San Emidio geothermal system and Wind Mountain epithermal deposit occupy intersections between favorably oriented north-northeast-striking normal faults and …
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Structural study of the auriferous Santoy shear zone, northeastern Glennie domain, Saskatchewan
… in the Santoy shear zone that may have increased fracture density and fluid flow during mineralization. The age of this intrusion (1807 ± 7 Ma) serves as a maximum age for the development of this flexure. Gold mineralization at Santoy is closely associated with a calc-silicate alteration …
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Aquifer Characterization in the Blue Ridge Physiographic Province
… water downward to the underlying variably fractured crystalline bedrock. In these models, interconnected fractures in the crystalline bedrock act as conduits for predominantly downward vertical and limited horizontal flow. Fracture density is depthà limited and correlated with proximity to …
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Velocity and Q from reflection seismic data
… Such differences may be due to variations in fracture density and therefore water content in the crust.
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Stretched Exponential Decline Model as a Probabilistic and Deterministic Tool for Production Forecasting and Reserve Estimation in Oil and Gas Shales
… understand the interaction of the different fracture properties on reservoir response and production decline curve behavior, a series of Discrete Fracture Network (DFN) simulations were performed. Results show that at least a 3-layer model is required to reproduce the decline behavior as …
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Nickel laterites, origin and climate
… between topography, faulting and protolith fracture density. The morphological and geochemical study of the Caldag and Bitincke paleodeposits indicates that there is a complex interplay between structures, topography, water table height and climate. Therefore nickel laterite deposits …
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Borehole electroseismic phenomena : field measurements and theory
… electrical fields in a borehole drilled through fractured igneous rocks. Analysis of field data confirms that the electrical fields that we measured were induced by fluid flow in fractures. The normalized amplitude of these electrical fields correlated with the fracture density log. In the second …
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Seismic anisotropy in siliciclastic reservoir rocks
… (LPO), preferentially aligned porosity, aligned fractures and the non-random spatial distribution of mineral phases). In this study the results from scanning electron microscope-electron backscattered diffraction (SENI-EBSD), quantitative X-ray diffraction (QXRD), image analysis, ultrasonic …
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Azimuthal P-wave AVA Inversion for Fracture Orientation and Density
… the numerical seismic modeling of a simulated fractured medium to analyze variations of seismic reflection amplitudes with incident and azimuthal angles (AVAZ). The intent is to extract the information about the fracture orientation and intensity of a fractured medium. The effective compliance …