A5021187319- NMR spectroscopy and applications
- Hydrocarbon exploration and reservoir analysis
- Advanced MRI Techniques and Applications
- Advanced Neuroimaging Techniques and Applications
- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Seismic Imaging and Inversion Techniques
- Landslides and related hazards
- Hydraulic Fracturing and Reservoir Analysis
- Seismic Waves and Analysis
- Advanced NMR Techniques and Applications
- Enhanced Oil Recovery Techniques
- Groundwater flow and contamination studies
- Geophysical Methods and Applications
Stanford University
2014-2017
Internal magnetic field gradients in porous materials, if sufficiently large, can be a source of error nuclear resonance (NMR) measurements the transverse relaxation time [Formula: see text] and diffusion coefficient text]. Given that these provide information about pore fluid geometry, it is important to determine magnitude internal assess their potential impact. We estimated effective aquifer sediment samples using three methods. used 2D NMR method map distribution versus found up with...
Measurements of the nuclear magnetic resonance (NMR) signal’s behavior with time provide powerful noninvasive insight into pore-scale environment. The dependence NMR signal, which is a function parameters called relaxation times, intimately linked to geometry pore space and has been used successfully estimate size permeability. basis for permeability estimates that interactions occurring at grain surface often as primary mechanism controlling signal. In this limit, fast diffusion when each...
We have conducted proton nuclear magnetic resonance (NMR) measurements of relaxation times [Formula: see text] and as well the diffusion coefficient to detect quantify gasoline, diesel, crude oil, trichloroethylene (TCE) in sediment samples containing water. The were coarse sand, fine a sand-clay mixture. found that water, oil all exhibited similar signal amplitudes per unit volume, whereas TCE one-tenth signal. ability use distinguish contaminant from water depended on bulk-fluid properties...
In a field study conducted in Pine Ridge, South Dakota, nuclear magnetic resonance (NMR) logging measurements were used to investigate an area of hydrocarbon contamination from leaking underground storage tanks. The NMR are directly sensitive hydrogen-bearing fluids the sediments surrounding well and can be estimate situ fluid volumes. relaxation time [Formula: see text] diffusion coefficient may differentiate between signal water contaminant, enabling estimation volume. this study,...
Hydrogeological problems often require the estimation of aquifer parameters in highly heterogeneous environments, where can change significantly at centimeter scale. Both seismic and GPR crosswell tomography be used to produce high-resolution velocity models near-surface, these transformed porosity using appropriate porosity-velocity models. In this study, between a pair wells shallow alluvial was predicted from data.
Nuclear magnetic resonance (NMR) methods can be used to measure the diffusion coefficient [Formula: see text] of fluids. In porous materials, pore fluid is restricted by boundaries, such that may smaller than bulk fluid. This reduction in provides information about geometry space. Significant overestimates can, however, occur due internal gradients caused susceptibility contrasts between and solid phase. We have investigated way which impact measured obscure link unconsolidated sediments....
PreviousNext You have accessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2015NMR for Near-surface Investigations (Development Applications)Authors: Emily FayRosemary KnightDenys GrombacherMike Müller-PetkeAhmad A. BehroozmandGianluca FiandacaEsben AukenM. Andy KassNeal PastickBruce WylieBurke MinsleyDana NossovElliot GrunewaldBrent BarkerMatt SpurlinDave WalshJames M. FineganBrady FlinchumW. Steven HolbrookCarole JohnsonJason SorensonKristal KielJohn...