Search Results

Now showing 1 - 5 of 5

Access status: Open Access ,
Department of Geophysics
(Wydawnictwa AGH, 2016) Jarzyna, Jadwiga; Dec, Jerzy; Wawrzyniak-Guz, Kamila
Access status: Open Access ,
Analiza czasowo-częstotliwościowa akustycznych obrazów falowych za pomocą transformaty falkowej
(Wydawnictwa AGH, 2005) Wawrzyniak-Guz, Kamila
Interpretation of acoustic full waveforms is based on identification of elastic waves recorded in boreholes. Determination of arrival time and duration of wave packets can be solved using time-frequency analyses such a wavelet transform. Discrete and continuous wavelet transform were applied to decomposition of wave field. Research showed that discrete wavelet transform is not a proper tool to solving the problem. However, it allows denoising signals. Research on continuous wavelet transform, which has better resolution, are carried out and gives a chance to decompose wave field into separate waves.
Access status: Metadata only ,
Elementy geofizyki ogólnej
(2021) Wawrzyniak-Guz, Kamila
Wydział Geologii, Geofizyki i Ochrony Środowiska; Centrum e-Learningu i Innowacyjnej Dydaktyki
Kurs obejmuje wybrane fragmenty zajęć Geofizyka ogólna, które autorka od lat prowadzi dla studentów 1 roku Geofizyki na Wydziale Geologii, Geofizyki i Ochrony Środowiska. Zawiera materiały i ćwiczenia dotyczące pola siły ciężkości i pola magnetycznego Ziemi. Kurs Elementy geofizyki ogólnej jest podzielony na trzy sekcje: <ol><li>Referaty – zawiera kilka pomysłów e-aktywności pokazujących w jaki sposób można zaangażować całą grupę w referat, który został przygotowany przez pojedynczego studenta,</li><li>Grawimetria,</li><li>Magnetometria.</li></ol>
Access status: Open Access ,
Wybrane aspekty skalowania profilowań geofizyki otworowej na potrzeby sejsmiki
(Wydawnictwa AGH, 2011) Jarzyna, Jadwiga; Bała, Maria; Krakowska-Madejska, Paulina I.; Wawrzyniak-Guz, Kamila
The results from the mathematical operations of filtration and interpolation are presented for dynamic elastic parameters such as P-wave slowness and S-wave slowness, Young modulus and Poisson ratio. The parameters were obtained by interpreting acoustic full waveforms using FalaFWS application of GeoWin system and based on calculations using the Estymacja program. The subject of the analysis were the results obtained from various lithostratigraphic formations in several Polish Lowland's borehole profiles sampled from surface to a depth of more than 5 km. The goal was to scale well log data of a high vertical resolution for seismic purposes. Average values of the elastic parameters were presented for units derived out of geological interpretation. The analysis also included calculation of the <i>Q</i> parameter, which is a measure of energy dispertion of elastic waves in a rock formation.
Access status: Open Access ,
Analiza akustycznych obrazów falowych w aspekcie zwiększania informacji o parametrach sprężystych i zbiornikowych skał
(2004-01-19) (Data obrony: 2007) Wawrzyniak-Guz, Kamila
Wydział Geologii, Geofizyki i Ochrony Środowiska
PhD thesis presents application of time-frequency methods to acoustic full waveforms (AFW) processing. The goals of the research are: precise determination of acoustic waves from AFW, wave field decomposition into separate waves and pointing out zones of different elastic parameters. First part of the thesis includes: theoretical background of time-frequency methods, information on full waveform acoustic logs and brief description of the data. Second part is devoted to detailed description of time-frequency analyses of acoustic full waveforms. Discrete and continuous wavelet transform and matching pursuit algorithm are applied to AFW. Simulations, methodology and results of each method are discussed in detail. From proposed methods matching pursuit reveals the best resolution and makes wave extraction possible. Results are used for transit interval time calculation, which are compared with the counterpart parameters obtained from the original waveforms (i.e. not decomposed with matching pursuit). Additionally, decompositions are used for determination of frequency content of each wave packet. Time-frequency representations of AWF are also used to improving qualitative interpretation. On the basis of continuous wavelet transform time-depth-frequency plots for a given frequency are constructed. What is more, continuous wavelet transform and matching pursuit decomposition are used to calculating instantaneous attributes that indicate local changes of geological formation. Presented research is a kind of methodological work. Developed procedures are innovative and universal.

Wawrzyniak-Guz, Kamila

Email Address

Employee

Alternative name

Department

Discipline

Author Profiles

Systemy AGH

Filters

Advanced Search

Filter by

Settings

Sort By

Results per page

Search Results