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  • thumbnail.journal.alt
    Item type:Doctoral Dissertation, Access status: Open Access ,
    Geologiczna interpretacja zapisu sejsmicznego rejestrowanego dla układów cienkowarstwowych
    (Data obrony: 2009) Marzec, Paweł 
    Wydział Geologii, Geofizyki i Ochrony Środowiska
    An anomalous amplification of a seismic amplitude in a reservoir zone is frequently the main indicator of gas saturation in a pore space (bright spot). It might be caused by the constructive interference of seismic signals reflected form the top and the bottom of a bed that thickness is lesser than a wavelength (tuning). The assessment of the tuning effect is indispensable when the amplitude analyses are treated as the main hydrocarbon indicator. The aim of the PhD thesis was to develop the methods of identification and elimination of the amplitude effect connected with the tuning. They are based on a change in both amplitude and shape of a seismic signal. The multivariant seismic modeling was the main research method. It was used to establish both the identification criteria of the seismic response of the thin-bedded strata and the methods of identification and elimination of the undesirable amplitude amplification caused by changes of a thickness. The developed methods and interpretational criteria were applied to both geological and reservoir interpretation of the seismic response of the Cenomanian sandstone in the 3D Grobla-Rajsko-Rylowa seismic survey area. It allowed us to separate the observed amplitude anomalies into two groups: first one caused by the gas saturation and second one caused by the thin layers. The obtained results are completely confirmed by data from the numerous wells in the area.