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Ghose, R. (author), Slob, E.C. (author)For shallow subsoil, the estimates of in-situ porosity and water saturation are important, but until now it has been difficult to estimate them reliably. We relate seismic and GPR reflection coefficients to porosity and water saturation using a shared earth model. Using this model, we propose a method to integrate quantitatively seismic and GPR...journal article 2006
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Van Dalen, K.N. (author), Ghose, R. (author), Drijkoningen, C.G. (author), Smeulders, D.M.J. (author)A reliable estimate of the in?situ permeability of a porous layer in the subsurface is extremely difficult to obtain. We have observed that at the field seismic frequency band the poroelastic behavior for different seismic wavetypes can differ in such a way that their combination gives unique estimates of in?situ permeability and porosity...journal article 2010
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El Allouche, N. (author), Drijkoningen, G.G. (author), Versteeg, W. (author), Ghose, R. (author)Seismic waves converted from compressional to shear mode in the shallow subsurface can be useful not only for obtaining shear-wave velocity information but also for improved processing of deeper reflection data. These waves generated at deep seas have been used successfully in hydrocarbon exploration; however, acquisition of good-quality...journal article 2011
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Zhubayev, A. (author), Ghose, R. (author)A careful look into the pertinent models of poroelasticity reveals that in water-saturated sediments or soils, the seismic (P and S wave) velocity dispersion and attenuation in the low field-seismic frequency band (20–200 Hz) have a contrasting behavior in the porosity-permeability domain. Taking advantage of this nearly orthogonal behavior, a...journal article 2012
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Ghose, R. (author)A digital 3C array seismic cone penetrometer has been developed for multidisciplinary geophysical and geotechnical applications. Seven digital triaxial microelectromechanical system accelerometers are installed at 0.25-m intervals to make a 1.5-m-long downhole seismic array. The accelerometers have a flat response up to 2 kHz. The seismic array...journal article 2012
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Ghose, R. (author), Zhubayev, A. (author)A careful look into the pertinent models of poroelasticity reveals that in water-saturated sediments or soils, the seismic (P and S wave) velocity dispersion and attenuation in the low field-seismic frequency band (20-200 Hz) have a contrasting behaviour in the porosity-permeability domain.Taking advantage of this nearly orthogonal behaviour, a...conference paper 2012
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Carvalho, J.P.G. (author), Ghose, R. (author), Borges, J. (author)The Lower Tagus Valley area (LTV), where Lisbon is located has been struck by several destructive earthquakes whose sources remain still to be determined. The identification of surface ruptures in the area is a challenging task that requires the use of geophysical techniques. This paper focuses on the identification, for seismic hazard purposes,...conference paper 2012
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- Konstantaki, L.A. (author), Draganov, D.S. (author), Heimovaara, T.J. (author), Ghose, R. (author) conference paper 2012
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Draganov, D.S. (author), Ghose, R. (author), Heller, K. (author), Ruigrok, E.N. (author)Application of seismic interferometry to records from receivers at the Earth’s surface from sources in wells retrieves the reflection response measured at the receivers as if from virtual sources located also at the surface. When the wavefields experience intrinsic losses during propagation, non-physical arrivals (ghosts) would appear in the...journal article 2012
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Carvalho, J.P. (author), Ghose, R. (author), Loureiro, A. (author)The definition of appropriate places for the development of paleoseismic studies is extremely important in earthquake engineering site investigations. The seismic reflection method is routinely used to locate shallow fault segments where these do not outcrop, like in low slip-rate areas where faults identified in Quaternary sediments have...conference paper 2012
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Konstantaki, L.A. (author), Draganov, D.S. (author), Ghose, R. (author)Poster presentation at the Geoscience Research Meeting, Delft, 7-2-2013conference paper 2013
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Ghose, R. (author), Carvalho, J. (author), Loureiro, A. (author)Small-throw seismogenic fault segments hidden in the Holocene sediments are crucial but difficult targets in seismic exploration. We report here the detection of the deformation pattern and a concealed fault segment in the unconsolidated sediments at Vila Franca Xira, Portugal, through identification in shear wave reflection data of multiple...journal article 2013
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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
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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
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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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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
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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
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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
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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