Searched for: faculty%3A%22Civil%255C%252BEngineering%255C%252Band%255C%252BGeosciences%22
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Minato, S. (author), Ghose, R. (author)
The spatial heterogeneity along a fracture is a key determinant for fracture-associated hydraulic properties. We propose a new method to estimate the heterogeneous compliance distribution of a fracture from the reflection response at the fracture surface. For this purpose, we formulate a data-driven approach for Green's function retrieval based...
conference paper 2015
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Konstantaki, L.A. (author), Draganov, D.S. (author), Ghose, R. (author), Heimovaara, T.J. (author)
In this study we investigate the application of seismic interferometry (SI) to seismic reflection data recorded over a landfill. Landfills represent strongly heterogeneous subsurfaces making the seismic reflection imaging challenging. We show that SI improves the imaging of high-density areas, which create scattering events in the recorded data....
conference paper 2015
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Konstantaki, L.A. (author), Ghose, R. (author), Draganov, D.S. (author), Heimovaara, T.J. (author)
Leachate and gas are a product of biochemical reactions occurring inside the landfill. Treatment technologies (e.g., recirculation of leachate) are developed to reduce the production of leachate. Imaging the location of the wet and gas pockets inside the landfill can help improve the treatment technologies. Wet pockets occur inside the landfill...
conference paper 2015
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Barbosa, N. (author), Rubino, J.G. (author), Caspari, E. (author), Minato, S. (author), Ghose, R. (author), Holliger, K. (author)
conference paper 2015
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Minato, S. (author), Ghose, R. (author)
Fluid flow through a fractured reservoir is often controlled by the large fractures. Seismically imaging these large fractures has the potential to illuminate their hydraulic properties.We derived a nonlinear imaging condition considering a medium containing nonwelded interfaces such as fractures for high-resolution fracture imaging. This was...
journal article 2015
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Konstantaki, L.A. (author), Ghose, R. (author), Draganov, D.S. (author), Diaferia, G. (author), Heimovaara, T.J. (author)
Understanding the processes occurring inside a landfill is important for improving the treatment of landfills. Irrigation and recirculation of leachate are widely used in landfill treatments. Increasing the efficiency of such treatments requires a detailed understanding of the flow inside the landfill. The flow depends largely on the...
journal article 2014
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Minato, S. (author), Ghose, R. (author)
Hydraulic properties of a fractured reservoir are often controlled by large fractures. In order to seismically detect and characterize them, a high-resolution imaging method is necessary. We apply a non-linear imaging condition to image fractures, considered as non-welded interfaces. We derive the imaging condition from the general correlation...
conference paper 2014
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Draganov, D.S. (author), Ruigrok, E.N. (author), Ghose, R. (author), Mikesell, D. (author), Van Wijk, K. (author)
We propose a method for estimating the reflection coefficient of a subvertical boundary and the the quality factor of the medium between a receiver and the subvertical boundary. The method uses surface waves from transient deterministic sources and is inspired by the occurrence of non-physical arrivals in seismic-interferometry results due to...
conference paper 2014
document
Konstantaki, L.A. (author), Ghose, R. (author), Draganov, D.S. (author), Diaferia, G. (author), Heimovaara, T.J. (author)
The ability to image and quantify the heterogeneity in municipal landfills is crucial for improving the landfill treatment methods, for predicting the behaviour of processes that take place inside the landfills and hence, for estimating the after-care period. Our aim is to image the flow paths inside landfills and to quantify the heterogeneity....
conference paper 2014
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Konstantaki, L.A. (author), Ghose, R. (author), Draganov, D.S. (author), Diaferia, G. (author), Heimovaara, T.J. (author)
Poster presentation at the Geosciences Research Meeting, Delft, February 20, 2014
lecture notes 2014
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Minato, S. (author), Ghose, R. (author)
Using the scattered elastic wavefield, a method to derive the power spectral density (PSD) of the heterogeneous compliance distribution, along the plane of a single fracture, is formulated. The method involves estimation of the stress field at the fracture depth from the scattered wavefield followed by least-squares optimization of the PSD of...
journal article 2014
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Konstantaki, L.A. (author), Dragnov, D.S. (author), Heimovaara, T.J. (author), Ghose, R. (author)
A significant problem with landfills is their aftercare period. A landfill is considered to be safe for the environment only after a relatively long period of time. Until it reaches such a condition, it has to be periodically treated. Not only are treatments very expensive, but they could be dangerous as well; for example, when barriers limiting...
journal article 2013
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Zhubayev, A. (author), Ghose, R. (author), Jihai, Y. (author), Jun, C. (author), Borodin, I. (author), Sanders, M. (author), Lim, T.K. (author), Menkiti, H. (author)
In this study, we first estimate seismic velocity and attenuation dispersion from a comprehensive zero-offset vertical seismic profile (VSP) data acquired in China. These results, combined with openhole data acquired at the same location, provide experimental evidence that the seismic attenuation in rocks is dominated by a fluid-flow mechanism....
journal article 2013
document
Kirichek, O. (author), Ghose, R. (author), Heller, H.K.J. (author)
We investigate the ability of complex electrical measurements to monitor the CO2 front propagation within brine-saturated reservoir rock. A laboratory facility has been developed to perform CO2-brine substitution experiments under reservoir conditions. In the present study, CO2 is injected into a brine-saturated core while the complex electrical...
journal article 2013
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Draganov, D.S. (author), Ghose, R. (author), Angelov, P. (author), Arts, R. (author)
One of the targets of time-lapse seismic monitoring of CO2 sequestration is to determine the parts of the reservoir reached by the injected CO2 and to estimate their saturation. Such information could be extracted from the time-lapse measurement using AVO or impedance information. But non-repeatability of the source positions and time-lapse...
journal article 2013
document
Minato, S. (author), Ghose, R. (author)
Characterizing the spatially heterogeneous fracture compliance through use of elastic waves has the potential to illuminate the hydraulic and mechanical properties along a fracture. We formulate the inverse scattering problem to estimate the heterogeneous compliance distribution along a single fracture embedded in a homogeneous background. For...
journal article 2013
document
Konstantaki, L.A. (author), Draganov, D.S. (author), Heimovaara, T.J. (author), Ghose, R. (author)
Understanding how sensitive the seismic method is to errors that can occur during a seismic survey or during the processing of the seismic data is of high importance for any exploration geophysical project. Our aim is to image the subsurface of a landfill, which is typically a heterogeneous system due to the presence of numerous scatterers....
conference paper 2013
document
Draganov, D.S. (author), Heller, H.K.J. (author), Ghose, R. (author)
Time-lapse seismic monitoring is a fundamental part in most monitoring programmes involving CO2 storage. Even though the seismic method has proven its applicability for monitoring, there are two major causes of uncertainty in the estimation of changes in the reservoir properties: non-repeatability of the source positions and the difficulty in...
conference paper 2013
document
Kirichek, O. (author), Ghose, R. (author), Heller, H.K.J. (author)
We explore a new monitoring technique for the CO2 front propagation and phase transition processes using complex electrical conductivity measurements. A laboratory facility has been built to conduct coreflood experiments under reservoir conditions. CO2 is injected in both dry and brine-saturated reservoir rock. The objectives of the study are to...
conference paper 2013
document
Minato, S. (author), Ghose, R. (author)
We have presented a new methodology to model the scattered wavefield due to a heterogeneous distribution of compliance along a single fracture and then to invert this compliance distribution or its power spectral density (PSD) from the scattered seismic response. We illustrate the validity through numerical examples using Gaussian PSD. First, we...
conference paper 2013
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