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 20 of 25 for “"Seismic inversion"”.
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Reservoir characterization using intelligent seismic inversion
… challenge in reservoir characterization studies. Seismic data is among those different types of data, which is usually used by geoscientists for structural mapping of the subsurface and making interpretations of the reservoir's facies distribution. Yet, it has been a common aim of geoscientists to …
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Reservoir characterization using seismic inversion data
… be inferred from analogs and geologic concepts, seismic surveys, and well data. Stochastically inverted seismic data are uninformative about meter-scale features, but aid downscaling by constraining coarse-scale interval properties such as total thickness and average porosity. Well data reveal …
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Computational aspects of three dimensional seismic inversion
Includes bibliographical references (page 71).
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Facies-driven, seismic inversion-based property modeling, for flow simulation of Delhi Oil Field, Louisiana
… phase XIII involves 4D and multi-component seismic imaging of the field to monitor the CO2 flood. The goal of this research is to develop a robust structural and stratigraphic framework for property modeling, to be used for flow-simulation of the CO2 flood. The Late Cretaceous volcanic-cored …
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Acoustic full-waveform to elastic pre-stack seismic inversion of the Yakutat Terrane, Gulf of Alaska
… acoustic and isotropic time-domain full waveform inversion (FWI) of marine seismic reflection and refraction data from the STEEP project (ST. Elias Erosion/tectonics Project). FWI is a non-linear data-fitting algorithm that aims to recover subsurface parameters from the recorded seismic wavefield. …
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New technologies for unconventional reservoir characterization: Seismic inversion, focal-time estimation, and signal processing to improve reservoir imaging
Seismic data, comprising both passively and actively recorded data, have long been used for resource evaluation and geohazard assessments. Unconventional resource extraction, such as Alberta’s Duvernay play, requires a multifaceted approach to optimize reservoir development and to mitigate …
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A computational framework for the solution of infinite-dimensional Bayesian statistical inverse problems with application to global seismic inversion
… the entire framework to a problem in global seismic wave propagation. Classical (deterministic) approaches to solving inverse problems attempt to recover the “best-fit” parameters that match given observation data, as measured in a particular metric. In the statistical inverse problem, we go …
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Ambient seismic noise tomography of the southern United States and seismic inversion with dictionary learning using unsupervised machine learning.
Seismic tomography and inversion are well-established methods to understand deep subsurface structures. These techniques are particularly effective in delineating complex crustal architectures, which often deviate from simplified textbook models. High-resolution seismic tomography enables the …
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The nonlinear differential semblance algorithm for plane waves in layered media
… approach to the output least-squares (OLS) seismic inversion for layered-media. The latter cannot guarantee a reliable solution for either synthetic or field data, because of the existence of many spurious local minima of the objective function for typical data, which lack low-frequency …
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An Investigation of Seismic Reflectivity Spectra, Moments, and Fractal Dimensions
Statistical models for seismic reflectivity spectra provide means of generating numerical reflection sequences as a priori information for seismic inversion, to test geophysical data processing techniques, and to parameterize real reflection sequences for classification purposes. I tested the …
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DESCRIPTION OF THE BAKKEN FORMATION’S ROCK PROPERTIES OF THE WILLISTON BASIN, NORTH DAKOTA
… to determine rock properties by utilizing seismic inversion techniques. The inversion technique is the most frequently used, by which the seismic interpreters derive lithology and physical properties. In this study, the 2D pre-stack seismic data was obtained from the analysis of Ross Field …
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EVALUATION OF BEDROCK DEPTH AND SOIL INFILTRATION ALONG PENNYPACK CREEK USING ELECTRICAL RESISTIVITY TOMOGRAPHY AND MOISTURE LOGGERS
… ERT was also used to validate or dispute recent seismic interpretations. Four study sites adjacent to Pennypack Creek were selected based on variations in underlying geology: Triassic basin sedimentary rock (Lukens), Paleozoic mafic gneiss (Meadow), Piedmont mica schist (Pine Road), and coastal …
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Applied Machine Learning with Latent Space Representation and Manipulation
… are accurately located. Second, we solve a seismic inversion problem which is a workflow for deriving the subsurface model from seismic measurements. We propose to utilize autoencoder deep networks with latent space-aligned domain adaptation to migrate the trained model to unexploited data. …
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Analyses and Applications of Seismic Surface Waves Using Machine Learning Algorithm
… waves are energetic signal components in the seismic inversion for near-surface elastic properties. However, they are noise components in reflection seismology in hydrocarbon exploration. Detecting and outlining the region of surface waves in seismic gathers facilitates either their inversion …
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Deep learning methods for shear log predictions in the Volve field Norwegian North Sea
… parameters. Shear logs are also used for various seismic analysis applications, such as Amplitude Versus Offset (AVO) inversion and multicomponent seismic interpretation. Furthermore, shear logs or their inverse shear velocity logs are an essential component for rock physics analysis in order to …
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Rock Physics Study of Lacustrine Shales and Applications in Geophysical Prediction of Sweet Spot
Rock physics analysis is crucial in bridging seismic data with reservoir properties. Although shale oil reservoirs are considered to be significant hydrocarbon resources, their exploration and extraction still pose challenges, especially in lacustrine shale environments. I conducted a comprehensive …
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Investigation of and correction for waveform changes arising from NMO stretch
NMO-stretch distorts seismic frequency content significantly depending on depths of the target reservoir and offset locations. It causes poor resolution on CMP-stacked sections for image processing, and also creates difficulty in extracting the exact wavelet for AVO analysis and seismic inversion. …
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Development of techniques for quantifying pressure and saturation changes from 4D seismic data applied to a North Sea field
This thesis addresses the facilitation of 4D seismic data interpretation by its conversion to the pressure and saturation domain. I develop three techniques for the quantification of pressure and saturation changes from 4D seismic data. Each technique addresses a specific demand on the reservoir …
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Applicability of rock physics models in conjunction with seismic inverted data to characterize a low poro-perm gas-bearing sandstone reservoir for well location optimization, Bredasdorp Basin, SA
… between rock properties and the observed seismic and to present the results of different seismic characterization techniques to interpret a tight gas sand reservoir off the south coast of South Africa using as input rock physics analysis and inverted seismic outcomes. To perform the aims …
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