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 18 of 18 for “"time-lapse seismic"”.
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Time-lapse seismic AVAz in the Stocker Field
… method, to address this problem using seismic data targeting the Barnett formation. Rüger’s method uses a linearized version of the full reflection coefficient for HTI media. Fourier Coefficients decomposition relies upon the fact that P-wave reflectivity can be described by a Fourier …
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Pressure estimation using time-lapse seismic in compacting reservoirs
… attributes in compacting reservoirs. The time-lapse seismic signal in these types of reservoirs results from the combination of pressure depletion, rock compaction and stress redistribution within the reservoir and throughout the surrounding rocks. Simulations using iterative coupling are …
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Full-waveform inversion of time-lapse seismic data using physics-based and data-driven techniques
Time-lapse (4D) full-waveform inversion (FWI) is an advanced seismic technique that can enable accurate estimation of changes in the subsurface properties, such as fluid saturation or reservoir depletion, by utilizing amplitude and phase information in seismic data. However, most existing 4D FWI …
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3D modeling and characterization of hydraulic fracture efficiency integrated with 4D/9C time-lapse seismic interpretations in the Niobrara Formation, Wattenberg field, Denver Basin
… measurements (DFIT) and observations (microseismic and 4D/9C multicomponent time-lapse seismic). By incorporating the geological heterogeneity into the 3D hydraulic fracture simulation, a more representative response is generated that demonstrate the variability in hydraulic fracturing …
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Full wavefield inversion methods for monitoring time-lapse subsurface velocity changes
Quantitative measurements of seismic velocity changes from time-lapse seismic experiments provide dynamic information about the subsurface that improves the understanding of the geology and reservoir properties. In this thesis, we propose to achieve the quantitative analysis using full wavefield …
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Analysis of the repeatability of time-lapse 3D VSP multicomponent surveys, Delhi field
… In order to monitor the CO2 sweep efficiency, time-lapse 3D seismic data have been acquired in this area. Time-lapse studies are increasingly used to evaluate changes in the seismic response induced by the production of hydrocarbons or the injection of water, CO2 or steam into a reservoir. A 4D …
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Elasto-static and -dynamic Analysis of Subsurface Fracture Phenomena
… anisotropic fracture parameters from reflection seismic data. The inversion results address several shortcomings associated with conventional techniques, including a relaxed constraint on fracture orientations and the resolution of a 90° azimuthal ambiguity, providing an improved estimate of …
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Time-Lapse Depletion Modeling Sensitivity Study: Gas-Filled Gulf of Mexico Reservoir
Time-lapse seismic allows oil/gas reservoir monitoring during production, highlighting compaction and water movement. Time-lapse modeling, using a stress-dependent rock physics model, helps determine the need and frequency of expensive repeat seismic acquisition. We simulate a Gulf of Mexico gas …
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Integrity Assessment Of Earthen Dams And Levees Using Cross-Plot Analysis Of Seismic Refraction And Electrical Resistivity Tomograms
… multiple geophysical anomalies. An anomaly on a seismic refraction or an electrical resistivity tomogram is an area that has different values compared to its surrounding. Geophysical anomalies in dams and levees can be due to the overall heterogeneity of the subsurface, structures such as …
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A Theoretical Framework for Seismic Time-lapse Difference AVO Analysis with Validation on Physical Modelling and Field Data
… applications in seismology, more recently for time-lapse problems. We have formulated a scheme for modeling linear and nonlinear elastic time-lapse difference amplitude variation with offset data. We have expressed this framework as an expansion in orders of the baseline interface properties …
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Seismic attribute analysis and CO2 monitoring within the Mississippian reservoir, Wellington field, Sumner County, Kansas
… the United States but are challenging to image seismically due to their high heterogeneity and thicknesses typically below seismic resolution. In 2016, the Kansas Geological Survey (KGS) conducted a pilot study in the Mississippian chert reservoir at Wellington field, Sumner County, Kansas to …
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Geophysical properties of carbon monoxide when used as an enhanced oil recovery agent
… other fluids' critical point, in turn aiding in time-lapse seismic monitoring by enhancing acoustic impedance contrasts of EOR fluids from liquid hydrocarbons to better define affected areas of the reservoir. Laboratory tests were designed to (1) investigate the acoustic phase properties of …
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Seismic Investigation on Temporal Structural Changes and Joint Inversion of Sedimentary and Crustal Structure Beneath North China
In recent years, time-lapse seismic imaging (4D) has received wide attentions as accurate imaging of the evolving subsurface structure has significant applications in disaster reduction, resource exploration, and environmental monitoring. One particularly interesting area to seismologists is …
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Reduced-Order Modelling and Observations of Geological Carbon Dioxide Storage
… River, Utah. In Chapters 4 and 5, I combine seismic observations of a carbon sequestration project with numerical modelling to investigate the extent to which reduced-order models can accurately predict CO2 movement in heterogeneous aquifers at the Otway CO2 sequestration project in Victoria, …
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Monitoring Sub-Surface Storage of Carbon Dioxide
… carbon capture and storage project. A suite of time-lapse, three-dimensional seismic reflection surveys have been acquired over the injection site. This suite includes a pre-injection survey acquired in 1994 and seven post-injection surveys acquired between 1999 and 2010. Nine consistently …
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Hierarchical Bayesian approaches to seismic imaging and other geophysical inverse problems
… these properties may vary spatially. In the seismic imaging problem, for example, where the objective is to estimate the earth's reflectivity, the reflectivity model is smooth along a particular reflector but exhibits a sharp contrast in the direction orthogonal to the reflector. In such …
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Quantitative monitoring of gas injection, exsolution and dissolution using 4D seismic
… this concern is addressed by the use of 4D seismic data. However, it is recognised that the seismic response still largely provides a qualitative estimate of the moved subsurface fluids; exact quantitative evaluation of fluid distributions and associated saturations remains a challenge still …