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New Methods in Sesimic Survey
Alexa, Martin ; Vilhelm, Jan (advisor) ; Valenta, Jan (referee)
The objective of this thesis is seismic survey, namely brief summary of a few selected new methods and technological modifications used in seismic survey of hydrocarbon deposits. The work focuses on a cable-free land seismic system, using optical fibre as acoustic sensors, technical improvements of vibrating units in Vibroseis technology and ocean bottom seismic while using VectorSeis Ocean technology. In the beginning concise historical outline and technical overview of progress from earthquake seismology to seismic survey is performed. Keywords: Seismology, seismic survey, hydrocarbons
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Joint interpretations of geophysical measurements as the key to understand landscape evolution
Tábořík, Petr ; Fischer, Tomáš (advisor) ; Kněz, Jaroslav (referee) ; Putiška, René (referee)
Užitá geofyzika představuje rychlý, efektivní a nedestruktivní způsob získávání informací o složení a stavu horninového prostředí, jakož i o studovaných geologických či geomorfologických procesech. Kombinování různých metod geofyzikálního průzkumu přináší ve srovnání s použitím pouze jedné geofyzikální metody výrazně širší rozsah měřených fyzikálních parametrů, což umožňuje získání mnohem podrobnějších informací o zkoumaném geologickém prostředí. K interpretacím geofyzikálních dat je vždy potřeba přistupovat obezřetně, protože jde mnohdy jen o jedno z pravděpodobných, nikoli však jediných možných řešení. Předkládaná disertační práce na několika vybraných případech ilustruje, jak snadno může dojít k nepřesné, nebo dokonce mylné interpretaci. V řadě případů přitom nemusí jít o problém kvality dat nebo chybného nastavení parametrů výpočetního modelu. Problém nastává při interpretaci výsledků, kdy dochází k přiřazení určité geologické kvality ke konkrétní měřené nebo modelované hodnotě nebo pozorované anomálii. Sdružené interpretace geofyzikálních metod (ideálně doplněné informacemi "negeofyzikálního" charakteru) mohou nejen přinést zásadní informace o studovaných geologických či geomorfologických fenoménech, ale také přispět metodickými poznatky, a to jak k metodám jednotlivým, tak zejména k jejich...
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A study of the Diendorf-Boskovice zone using geophysical methods
Alexa, Martin ; Valenta, Jan (advisor) ; Levý, Oldřich (referee)
The objective of this thesis is to compare applications of seismic and geoelectric methods and to state recommendations for their application in future geological prospection, especially application of shallow seismic reflection. Another goal was verification of assumed course of tectonic lines and thickness and character of sedimentary infill, which are important for calculation of seismic hazard by actual standards in context with effort of prolonging licence and also expansion of nuclear power plant Dukovany. When selecting locations for survey there was an effort to confirm the position of the Diendorf-Boskovice zone border and fault zones leading through the zone. The survey was done using multi- electrode electrical resistivity tomography, refraction and reflection seismic.
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Land Seismic Sources in Exploration Seismology
Měšťan, Jan ; Vilhelm, Jan (advisor) ; Valenta, Jan (referee)
The purpose of the bachelor thesis is to compile an overview of the information about sources of seismic energy used in land seismic survey. At the beginning of the thesis, the physical basis of seismic methods is mentioned. Basic types of seismic waves are briefly described and the specific of the spread of seismic waves through the rock environment is mentioned. It is followed by a chapter about the history of land seismic sources, which maps their use approximately since the half of the 19th century till the beginning of the commencement of a method Vibroseis in 1950's and 1960's. The overview of seismic sources is in the chapter called Land seismic sources division. Seismic sources are divided into those, which use chemical explosives and mechanical sources. Mechanical sources are divided into impulsive, vibratory and special sources. The attention is paid to their technical parameters and other properties (for example chemical composition in a case of explosives), which is supplemented by examples of commercial sources. There is also present an experimental part in the thesis. There is tested a faculty electrodynamic vibrator. It enables to generate vibratory signals of any time course. The frequency characteristics of the vibrator was experimentally determined. A faculty seismograph Geode and...
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Seismic survey for offshore oil and gas exploration
Alyjeva, Sabina ; Vilhelm, Jan (advisor) ; Valenta, Jan (referee)
This thesis briefly summarizes the use of seismic survey methods conducted offshore for the purpose of oil and natural gas exploration. Specifically it deals with seismic reflection method which is mostly used in marine exploration. The aim of this work is briefly introduce the fundamentals of the seismic exploration method, principles of used equipment and the measurement process itself. More over the thesis also shortly presents the composition of hydrocarbons and the process of their formation and accumulation in the geological environment. Last but not least it deals with the data processing and interpretation of seismic data.
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New Methods in Sesimic Survey
Alexa, Martin ; Vilhelm, Jan (advisor) ; Valenta, Jan (referee)
The objective of this thesis is seismic survey, namely brief summary of a few selected new methods and technological modifications used in seismic survey of hydrocarbon deposits. The work focuses on a cable-free land seismic system, using optical fibre as acoustic sensors, technical improvements of vibrating units in Vibroseis technology and ocean bottom seismic while using VectorSeis Ocean technology. In the beginning concise historical outline and technical overview of progress from earthquake seismology to seismic survey is performed. Keywords: Seismology, seismic survey, hydrocarbons
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