Podrobnosti záznamu

Název
    The differences in detectability of perforation shots and microseismic events in the surface monitoring: the attenuation effect
Autor
    Einšpigel, D.
    Eisner, Leo
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Acta geodynamica et geomaterialia
Svazek/č.
    Roč. 11, č. 2
Strany
    s. 159-164
Rok
    2014
Poznámky
    Projekt: GAP210/12/2451, GA ČR3cav_un_auth*0284895
    Rozsah: 6 s. : P
Předmětová kategorie
    attenuation
    detectability
    frequency domain
    microseismic processing
Klíčové slovo
    Attenuation
    Detectability
    Differences
    Effect
    Events
    Microseismic
    Monitoring
    Perforation
    Shots
    Surface
Abstrakt (anglicky)
   Detection of the seismic signal from perforations or string shots is crucial for calibration of velocity model for surface or downhole monitoring. While in the borehole recordings perforation shots have higher signal to noise ratio of the P-waves than microseismic events, in the surface monitoring recordings it is often opposite. We investigated amplitude spectra of microseismic events and perforation shots in the downhole data and found that amplitude ratios in the band of 20-30 Hz relative to band 100-200 Hz are stronger for the microseismic events. Thus we suggest that detectability of the perforations in surface recorded data is limited by attenuation of the higher frequency signal which increases exponentially with frequency. This suggests that longer duration of calibration shots can improve detectability of string shots at the surface.
Přispěvatel
    AV ČR Brno, Ústav struktury minerálů a hornin
Kód přispěvatele
    AV ČR, ÚSMH
Zdrojový formát
    U
Datum importu
    24. 10. 2014