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A unified framework for relative source localization using correlograms 

Poliannikov, Oleg V.; Prange, Michael; Malcolm, Alison E.; Djikpesse, Hugues (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
We study the problem of determining an unknown event location relative to previously located events using a single monitoring array in a monitoring well. We show that using the available information about the previously ...
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Using SVD for improved interferometric Green's function retrieval 

Melo, Gabriela; Malcolm, Alison E.; Mikesell, Dylan; van Wijk, Kasper (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
Seismic interferometry (SI) is a technique used to estimate the Green’s function (GF) between two receiver locations, as if there were a source at one of the receiver locations. However, in many applications, the requirements ...
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Analysis of location uncertainty for a microearthquake cluster: A case study 

Melo, Gabriela; Malcolm, Alison E.; Poliannikov, Oleg V.; Fehler, Michael (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
In many reservoirs, an increase in permeability and conductivity is achieved by hydraulic fracturing/stimulations which open cracks and fractures that then act as pathways for fluids to navigate in the subsurface. Mapping, ...
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Target-oriented Time-lapse Waveform Inversion using Virtual Survey 

Yang, Di; Zheng, Yingcai; Fehler, Michael; Malcolm, Alison E. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
Time-lapse seismic data are widely used for monitoring time-variant subsurface changes. Conventional analysis provides qualitative information by comparing results from consecutive surveys, whereas waveform inversion can ...
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Interferometric imaging of multiples in an RTM approach 

Malcolm, Alison E.; de Hoop, Maarten V. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
It is well known that reverse-time migration is capable of correctly imaging multiply scattered energy. To do this, one of the interfaces from which the waves scatter must be included in the background velocity model. ...
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Microquake seismic interferometry with SVD enhanced Green's function recovery 

Melo, Gabriela; Malcolm, Alison E. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
The conditions under which seismic interferometry (SI) leads to the exact Green’s function (GF) are rarely met in practice, resulting in errors in the recovered GF. To alleviate this problem, we employ additional information ...
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Interferometric hydrofracture microseism localization using neighboring fracture 

Poliannikov, Oleg V.; Malcolm, Alison E.; Djikpesse, Hugues; Prange, Michael (Massachusetts Institute of Technology. Earth Resources Laboratory, 2011-05-19)
Hydraulic fracturing is the process of injecting high-pressure fluids into a reservoir to induce fractures and thus improve reservoir productivity. Microseismic event localization is used to locate created fractures. ...
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SVD enhanced seismic interferometry for traveltime estimates between microquakes 

Melo, Gabriela; Malcolm, Alison E. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
In general, Green’s functions obtained with seismic interferometry are only estimates of the true Green’s function, introducing uncertainties to the information recovered from them. However, there are still many cases in ...
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Detecting medium changes from coda by interferometry 

Poliannikov, Oleg V.; Malcolm, Alison E. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
In many applications, sequestering CO[subscript 2] underground for example, determining whether or not the medium has changed is of primary importance, with secondary goals of locating and quantifying that change. We ...
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Comparison of microearthquake locations using seismic interferometry principles 

Melo, Gabriela; Malcolm, Alison E.; Fehler, Michael (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
Mapping, localization, and general characterization of problems in reservoir fracture systems is one of the most important in oil, gas, and geothermal energy production. One way to study and monitor these fracture systems ...
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AuthorMalcolm, Alison E. (11)Melo, Gabriela (6)Poliannikov, Oleg V. (6)Fehler, Michael (3)Djikpesse, Hugues (2)Prange, Michael (2)van Wijk, Kasper (2)de Hoop, Maarten V. (1)Mikesell, Dylan (1)Mikessel, Dylan (1)... View MoreSubject
Interferometry (13)
Imaging (7)Microseismic (6)Fractures (1)FWI (1)Inversion (1)Migration (1)Multiples (1)VSP (1)... View MoreDate Issued2010 (5)2011 (3)2012 (3)2013 (2)Has File(s)Yes (13)

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