Browsing by Subject "seismic methods"

Now showing 1 - 9 of 9

Access status: Open Access ,
Analiza efektywności tomografii amplitudowej opartej na zmianach częstotliwości centroidalnej widma sygnału w pomiarach międzyotworowych - studium modelowe
(Wydawnictwa AGH, 2008) Kasina, Zbigniew
In the presented paper the results of the analysis of the influence of seismogeological model parameters as well as inversion parameters on the effectiveness of attenuation variations imaging by means of amplitude tomography based on the variations of centroidal frequency of signal spectrum in the seismic well to well measurements have been described. In the considerations the homogeneous models with the zones of higher and lower values of velocity and attenuation as well as gradient media were taken into consideration. In the analysis of the effectiveness the centroidal frequencies of the signals observed in the receiver points and traveltimes generated for assumed models were used. The main attention was paid to the effect of starting velocity field on the results of tomographic inversion.
Access status: Open Access ,
Analiza porównawcza efektywności tłumienia fali powierzchniowej za pomocą transformacji falkowej, transformacji Radona, filtracji pasmowej oraz filtracji F-K
(Wydawnictwa AGH, 2010) Szymańska-Małysa, Żaneta
The objective of the paper is to present the comparison analysis of the effectiveness of surface wave attenuation using wavelet transform, Radon transform, bandpass filter and F-K filter. Wavelet transform was performed in MATLAB computing environment. Radon transform, bandpass filter and F-K filter were realized in seismic data processing system ProMAX. The basic part of the paper is devoted to the analysis of surface wave attenuation by means of the wavelet transform treated as innovative tool of seismic data processing. In the analysis the common shot point gathers (seismic records) were used for the case of dynamite seismic. The influence of the wavelet transform parameters on the effectiveness of surface wave attenuation from seismic records wave images was defined. The comparison was performed using seismic records wave images and their mean amplitude spectra.
Access status: Open Access ,
Analiza wpływu parametrów modelu sejsmogeologicznego i parametrów sygnału na zmiany częstotliwości centroidalnych jego widma w pomiarach międzyotworowych - studium modelowe
(Wydawnictwa AGH, 2008) Kasina, Zbigniew
In the presented paper the results of the analysis of the influence of seismogeological model and source signal parameters on the variations of centroidal frequencies of its spectrum in the seismic well to well measurements have been described. In the analysis the homogeneous models with the zones of higher and lower values of velocity and attenuation as well as gradient models and different source signal parameters (dominant signal frequency, signal type) were taken into consideration In the analysis of centroidal frequencies of the signals in the receiver points the model data (traveltimes and centroidal frequencies of signal spectrum) were used These data were generated by means of elaborated by author computer programs appriopriated for a solution of the direct problems of taveltime and amplitude tomography.
Access status: Open Access ,
Estimation of the range of fractured zone in the roof of underground roadways using the seismic method
(Wydawnictwa AGH, 2005) Jarosz, Jacek
It is a well-known truth that each mining activity changes the natural stress field in the rock mass. Driving of underground roadways leads to the appearance of a fractured zone around the excavated space. Separated and fractured roof rocks of underground roadways possess significant danger to the safety of people working in the mine. Knowledge of the thickness of the fractured zone is very important to the process of protecting roadways and particularly to determine conditions of roof bolting. A new way of use of a seismic method to estimate the parameters of fractured zones is described in this paper. The Love-type interference waves generated by hammer blows in roadway roof rock are discussed. The results of field measurements in a coal mine are presented.
Access status: Open Access ,
Modelowanie trajektorii promieni i czasów przebiegu fal odbitych PP, SS i PS dla dyskretnego ośrodka poprzecznie izotropowego z nachyloną osią symetrii
(Wydawnictwa AGH, 2009) Kasina, Zbigniew
In the presented paper the basic assumptions of the algorithm and program of seismic ray trajectories and travel times modelling are described for the case of reflected PP, SS and PS waves in the discrete anisotropic (transversely isotropic) medium with tilted symmetry axis. The ray trajectories and travel times in the discrete horizontally layered medium (VTI) and in the monoclinally dipping layers are defined by means of the numerical solution of the partial equations set resulting from the Fermat principle. The values of the velocities and Thomsen anisotropy parameters are defined in the nodes of the assumed, two dimensional grid. The comparison of the reflection waves hodographs was accomplished for selected isotropic and anisotropic models in the case of CDP gathers.
Access status: Open Access ,
Subsurface velocity model in post-glacial deposits based on multichannel analysis of surface waves
(Wydawnictwa AGH, 2012) Matuła, Rafał; Lewińska, Paulina
First introduced and developed in the 1990s, the multichannel analysis of surface waves (MASW) is one of the active, seismic methods created for shallow seismic imaging.
Access status: Open Access ,
The analysis of the effectiveness of the seismic noise attenuation by means of Karhunen-Loeve (K-L) transform
(Wydawnictwa AGH, 2010) Kasina, Zbigniew
In the paper the analysis of the effectiveness of multiples and random noise attenuation using Karhunen-Loeve (K-L) transform is presented. The K-L transform is realized with application the process Eigenimage Filter in seismic data processing system ProMAX. The basic part of the paper is directed to the analysis of multiples attenuation by means of the K-L transform applied to field data. In the analysis the common shot point gathers (seismic records) were used as well as the traces of the CDP gathers. In the case of CDP gathers the main attention was paid on the multiple attenuation in the averaged CDP gathers (supergathers) prepared for the interactive velocity analysis. The influence of the K-L filter parameters was defined on the effectiveness of multiples removing from the velocity analysis wave images. Finally the effectiveness of the K-L filter was estimated in improving the coherent to random signals ratio on the seismic records.
Access status: Restricted ,
Zastosowanie badań sejsmicznych dla lokalizacji budowli wielkogabarytowych na przykładzie cementowni Rudniki
(Data obrony: 2010-10-06) Sala, Szymon
Wydział Geologii, Geofizyki i Ochrony Środowiska
In the thesis the opportunity of seismic methods application (refraction method, MASW) in order to determine the physical parameters and seismic boundaries in the medium has been introduced. The relationships between seismic velocities, physical parameters and geotechnical classifications have been showed. The thesis discusses the higher effectiveness of the use of seismic methods in comparison to traditional geological surveys. It is based on the data obtained from the measurements carried out in the Rudniki cement mill area.
Access status: Restricted ,
Zastosowanie metod geofizycznych dla oceny zasobów wód geotermalnych
(Data obrony: 2019-03-05) Grabowski, Maciej
Wydział Geologii, Geofizyki i Ochrony Środowiska
Praca dyplomowa przedstawia metody geofizyczne stosowane w poszukiwaniu złóż wód geotermalnych. Określenie zarówno geologicznego jak i geotermalnego modelu badanego obszaru jest kluczowym aspektem decydującym o powodzeniu inwestycji. Dzięki badaniom geofizycznym możliwe jest rozpoznanie parametrów złożowych i petrofizycznych skał oraz zbadanie budowy geologicznej obszaru. Celem projektu było zaprezentowanie możliwości najbardziej znanych metod geofizycznych stosowanych w geotermii oraz ich wykorzystanie w polskiej oraz światowej prospekcji. W pracy przedstawiono poszczególne metody oraz konkretne przykłady ich wykorzystania.