Geologia
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ISSN 0138-0974
e-ISSN: 2353-0782
Issue Date
2011
Volume
T. 37
Number
Nr 3
Description
Journal Volume
Geologia
T. 37 (2011)
Projects
Pages
Articles
Zespoły mięczaków w vistuliańskich lessach we wsi Chobrzany koło Sandomierza (południowa Polska)
(Wydawnictwa AGH, 2011) Alexandrowicz, Witold Paweł
Malacological analysis was conducted on shell material from loess profile in Chobrzany village located near Sandomierz. This particular profile represents a vertical wall, up to 6.5 m high. Its upper part is composed of typical, yellow loess with vertical cracks covered by recent soil. In the lower interval the occurrence of poorly visible lamination and carbonate concretions is observed. Six species of snails were identified. These belong to the so-called »loess species«. Several types of molluscan communities can be distinguished on the basis of faunistic changes. These molluscs' assemblages correspond with the palaeoenvironment and they allow for palaeoclimatic and stratigraphical reconstructions. The results of malacological analysis indicate that the loesses in Chobrzany could belong to the youngest loess sequence (Upper Younger Loess), which were deposited during Pleniglacial Phase of Vistulian.
Feasibility analysis of using GPR method for the examination of post-glacial deposits in mountainous geological environment
(Wydawnictwa AGH, 2011) Tomecka-Suchoń, Sylwia; Gołębiowski, Tomisław
The Ground Penetrating Radar (GPR) measurements presented in this paper had two main objectives. The first was to analize the possibility of using GPR method in examination of sediments in a mountainous geological environment and the second objective was to assess the special distribution of post-glacial sediments and their thickness at a selected site. The experimental measurements were carried out on in the alp of Ornak in the western part of Tatra Mountains This article provides a brief theoretical analysis of possible use of the georadar method in post-glacial sediment examination. The results of GPR surveys done in the reflection profiling mode enable the distinction of zones with different amount of till, clay, sand, gravel and rock debris in the post-glacial sediments.
Modelowanie wpływu wybranych parametrów sprężystych ośrodka oraz metodyki obserwacji na zmiany cech dynamicznych oraz kinematycznych odbić czerwonego spągowca
(Wydawnictwa AGH, 2011) Kasina, Zbigniew
The main purpose of the study was to define the influence of the elastic parameters of the geological medium (velocities, medium anisotropy, medium attenuation), aquisition parameters (long offsets, seismic signal parameters) and selected processing procedures (stacking velocity estimation and defining the kinematic corrections) on reflections from the Rotliegendes boundaries within Golce- 1 well region. In order to solve the formulated task a program for numerical modeling of the seismic ray trajectories in the anisotropic medium (VTI) with attenuation was developed by the author. The seismogeological models were based on data from the scientific publications as well as available data taken from well measurements, which comprised of sonic logs and check shots. The results of the analysis confirmed that both the velocity anisotropy and long spreads had no significant effect on stacking velocity errors and kinematic corrections estimation. The results also confirmed a strong attenuation effect of the medium on variations of the spectra of Rotliegendes reflections.
Wybrane aspekty skalowania profilowań geofizyki otworowej na potrzeby sejsmiki
(Wydawnictwa AGH, 2011) Jarzyna, Jadwiga A.; 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.
Modele prędkościowe na potrzeby sejsmiki na podstawie profilowań geofizyki otworowej
(Wydawnictwa AGH, 2011) Jarzyna, Jadwiga A.; Bała, Maria; Krakowska-Madejska, Paulina I.
Compressional ($V_{p}$) and shear ($V_{s}$) elastic waves velocities were determined from logging measurements using FWS tool and acoustic full wavetrains processing using FalaFWS application in GeoWin system. Estymacja program was used to calculate both types of wave velocities ($V_{p}$, $V_{s}$) and bulk density theoretical formulas, which combine quantities dependent on mineral composition, porosity, water saturation and type of medium in the rock. The results were compared with respect to P and S waves slowless, bulk density and dynamic elastic moduli: Young modulus, bulk modulus, shear modulus and Poisson ratio. It was determined that in the absence of $V_{p}$ and $V_{s}$ with a lack of acoustic full wavetrains registration, only the Estymacja program provides the expected results. The FalaFWS application broadens the range of results compared to logging results in depth sections where velocity of mud is higher than the velocity of S wave in formation.