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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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Automatic processing of microseismic data and their relation to the hydraulic injection
Vlček, Josef ; Fischer, Tomáš (advisor) ; Plicka, Vladimír (referee) ; Růžek, Bohuslav (referee)
Microseismic monitoring is an integral part of scientific experiments or industrial operations associated with the hydraulic fracturing of bedrock, which is an effort to increase the permeability of rocks in the area and improve the exploitation, whether of heat, oil or natural gas. Monitoring of such newly formed or growing original fractures, usually followed by seismic events, is very important for observation and describing the hydraulic fracturing itself and its progress over time. Since the number of such events recorded is usually very high, classical methods of earthquake processing, where the arrival times of seismic waves are determined manually, seem to be very inappropriate. For this reason, automatic methods are used to process such datasets, which do not require manual determination of the arrival times of the seismic waves. In our case, the data were recorded by a dense network of surface receivers arranged in the shape of a ten-arm star. It was a total of more than nine hundred groups of vertical geophones, of which more than a quarter were also supplemented by a three-component seismic sensor. We then created an automatic procedure for the described network, the result of which is the determination of the location and the source mechanism for each seismic event. The recorded...
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The crust/mantle boundary in geodynamically active area of West Bohemia
Podolník, Jan ; Hrubcová, Pavla (advisor) ; Málek, Jiří (referee)
The region of West Bohemia is one of the most geodynamically active areas of Central Europe. The activity is characterized by many natural phenomena such as recurrent seismic swarms. The crustal structure of the region was subject of many geophysical investigations that revealed increased reflectivity of the lower crust. In this thesis, we adapt the multi-azimuthal approach for the detection of crustal discontinuities developed by Hrubcov'a et al. (2013). We apply the ap- proach on waveforms of the 2000 and 2008 swarms that occurred in the Nov'y Kos- tel focal area registered by several German stations. Analysis of the data of more distant German stations allowed expanding of the information about the depth and character of the crust/mantle transition in a broader area of the West Bo- hemia region. The results show a thickening of the zone in Germany with in- creasing distance from the epicentral area. Such findings are in agreement with previous active and passive seismic experiments.
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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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