Publications of the Institute of Geophysics, Polish Academy of Sciences
Geophysical Data Bases, Processing and Instrumentation
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Publications of the Institute of Geophysics, Polish Academy of Sciences provide original solutions in geophysical measurements, instrumentation, data collections, presentations and analysis.
Results of Geomagnetic Observations: Belsk, Hel, Hornsund, 2019
Author(s): Reda J., Neska M., Wójcik S., Czubak P.
This publication contains basic information on geomagnetic observations carried out in 2019 in three Polish geophysical observatories: Belsk, Hel, and Hornsund. IAGA codes are respectively: BEL, HLP, and HRN. All these observatories belong to the Institute of Geophysics, Polish Academy of Sciences. Observatories Belsk and Hel are located on the territory of Poland, while Hornsund is in Spitsbergen archipelago, under Norwegian administration.In 2019, like in the previous years, the Belsk, Hel, and Hornsund observatories have kept a close collaboration with the world network of geomagnetic observatories INTERMAGNET. The Belsk Observatory joined INTERMAGNET in 1992, Hel in 1999, and Hornsund in 2002.
Anisotropy Estimation of Lower Paleozoic Shales from Northern Poland using Microseismic Data
Author(s): Gajek W.
Downhole microseismic monitoring is a widely used tool for the assessment of hydraulic fracturing job effectiveness. During the process of fluid injection into the reservoir, new fractures develop due to the induced pressure, which gives rise to microseismic events. Therefore, the knowledge of an accurate velocity model is necessary in order to locate the induced micro-seismic events. Subsurface complexity is often raised by a horizontal layering, an intrinsic anisotropy of shales, and aligned fracture sets. That introduces anisotropic effects into the velocity field. In such a case, the anisotropy should be taken into account during the velocity model building. Otherwise, some errors will be introduced into the microseismic event locations, and hence, the interpretation of treatment effects will be biased. Therefore, this thesis is devoted to the anisotropy estimation using downhole microseismic data.