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 59 for “"Microseismic"”.
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PORTABLE WIDEBAND MICROSEISMIC DATA ACQUISITION SYSTEM
Microseismic monitoring has gained importance ever since a correlation was established between earthquakes and intensive mining operations at various mine sites across the world. A microseismic network is in place at the Cory, Saskatchewan, mine site to record vibrations from minor tremors and to …
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Sensor placement for microseismic event location
… intensity earthquakes that are referred to as microseismic events. Monitoring of microseismic events is useful in predicting and comprehending hazards, and in evaluating the overall performance of a mine design. A robust localization algorithm is used to estimate the source position of the …
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Bayesian source inversion of microseismic events
… the data, especially for low magnitude, namely microseismic, events. Many of the uncertainties can be poorly quantified, and are often not included in source inversion. This thesis proposes a Bayesian framework enabling a complete inclusion of uncertainties in the resultant probability …
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Geomechanical Reservoir Model Calibration and Uncertainty Assessment from Microseismic Data
… reservoir characterization (SSBRC) to integrate microseismic events to infer reservoir property distributions. To model the geothermal reservoir stimulation, a fully coupled thermo-poroelastic finite element method (FEM) model has been developed to handle the coupled process of heat transport, …
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Automatic P-wave Picking of Microseismic Events in Underground Mines
This thesis investigates microseismic P-wave arrival time detection performance of automatic picking algorithms, as well as the handpicking performance of human experts. The data set used in this project was collected from Malmberget mine (LKAB, Sweden) and the handpicked P-wave arrivals were …
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Effectiveness of microseismic monitoring for optimizing hydraulic fracturing in California
… in California. Some of these companies use microseismic monitoring technologies to maximize production from hydrocarbon reservoirs. In this study, the effectiveness of microseismic monitoring to maximize production in California is explored. This is accomplished by comparing trends in oil …
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Deep learning framework bridges lab and field scale microseismic focal mechanism
… that these systems can induce earthquakes. Microseismicity, which has lower magnitude and occur more often than conventional earthquakes, is a key diagnostic tool for these sites. Where possible, moment tensor inversion of microseismic source mechanisms is particularly useful as these …
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A new signal processing method for acoustic emission/microseismic data analysis
"The acoustic emission/microseismic technique (AE/MS) has emerged as one of the most important techniques in recent decades and has found wide applications in different fields. Extraction of seismic event with precise timing is the first step and also the foundation for processing AE/MS signals. …
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Spatio-temporal microseismic analysis of the Woodford Shale, Canadian County, Oklahoma
Microseismicity provides data that can be used to monitor hydraulic fracture stimulation programs as well as to characterize the resulting hydraulic fractures. This is especially important in low permeability gas and oil shales, where the creation of additional permeability through these fracture …
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Microseismic mapping and source characterization for hydrofracture monitoring : a full-waveform approach
The objective of this thesis is to improve the microseismic mapping capability for hydrofracture monitoring by using full-waveform information and understand fracturing mechanisms via microsesimic source mechanism inversion. First, we develop an array-based correlation approach to improve the …
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Elastic time-reverse imaging and transmission tomography for microseismic and DAS VSP data
… that produce high-quality passive-source (e.g., microseismic) images or structural images of geological interfaces constructed using controlled-source energy (e.g., vibroseis truck or dynamite). Most existing wavefield migration and tomography techniques employed in the oil and gas industry are …
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Imaging the Soultz Enhanced Geothermal Reservoir using double-difference tomography and microseismic data
… methods. The stimulations produced over 12000 microseismic events of which we chose 8930 for further analysis. We obtained high accuracy cross-correlation differential times and then performed a double-difference tomographic inversion to jointly invert for velocity structure and event …
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Microseismic Monitoring of a Room and Pillar Retreat Coal Mine in Southwest Virginia
… rockmass behavior associated with the process. A microseismic monitoring system was installed in a retreat mine in Southwest Virginia to provide more information about the changing stress conditions created by retreating and ultimately reduce risk to miners. Microseismicity has been proven to be …
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B-Value Analysis of Microseismic Events Observed on Three Wellpads in the Horn River Basin
… analysis is carried out on a large dataset of microseismic events accumulated from over 300 stages during the hydraulic fracture treatment of three wellpads in the Horn River basin. This analysis is carried out on three different length scales: the single stage level, the level of the formation …
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Microseismic guided wave eigenfunction theory with application to event depth classification in the Eagle Ford shale
… theory, and a novel application for microseismic event depth constraint to an unconventional reservoir is developed. Eigenfunctions, historically used in the analysis of Rayleigh and Love surface waves, allow rapid calculation of response functions that are linearly-correlated with …
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Microseismic observations in the Ceres-Tulbagh aftershock zone, Western Cape, South Africa, and their tectonic implications
… of the 1969 Ceres earthquake. A total of 168 microseismic events could be located within the boundaries of the array, roughly 30 km x 40 km. Travel times of these events were used for coupled hypocenter-velocity inversion to produce a one dimensional velocity model with station corrections. …
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Monitoring microseismic activity in core samples encased in core flooding apparatus subjected to confining and pore pressures
… however, may be accompanied with an increase in microseismic activity. In order to better understand the causes of microseismic events detected during and after CO2 injection, a sensitive, reliable and consistent data acquisition system was developed in the present study for monitoring …
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New technologies for unconventional reservoir characterization: Seismic inversion, focal-time estimation, and signal processing to improve reservoir imaging
… multicomponent seismic reflection data, and microseismic data recorded from a permanent near-surface passive recording array. For this study, an industry partner provided two multicomponent seismic reflection surveys, as well as two co-located passive microseismic surveys. The Microseismic …
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An Analysis of Focal Parameters with Application to West Texas Micro-Earthquakes
… have been extensively studied recently: microseismic events associated with hydraulic fracturing in unconventional reservoirs and induced seismicity associated with fluid extraction and wastewater injection in oil fields. This dissertation investigates the location errors of microseismic …
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PetroVis & FractVis: Interactive Visual Exploration of High-dimensional Oil and Gas Data
… of two oil and gas domain case studies, namely: microseismic monitoring (in the design of FractVis) and petrographic analysis (in the design of PetroVis). For each of the case studies, we outline the necessary tasks, needs, and the challenges faced by the domain experts. By closely collaborating …
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