THE DIFFERENCES IN THE DETECTABILITY OF PERFORATION SHOTS AND MICROSEISMIC EVENTS IN THE SURFACE MONITORING: THE ATTENUATION EFFECT

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10290405" target="_blank" >RIV/00216208:11320/14:10290405 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

THE DIFFERENCES IN THE DETECTABILITY OF PERFORATION SHOTS AND MICROSEISMIC EVENTS IN THE SURFACE MONITORING: THE ATTENUATION EFFECT

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

THE DIFFERENCES IN THE DETECTABILITY OF PERFORATION SHOTS AND MICROSEISMIC EVENTS IN THE SURFACE MONITORING: THE ATTENUATION EFFECT

Popis výsledku 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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DC - Seismologie, vulkanologie a struktura Země

OECD FORD obor

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Projekt

<a href="/cs/project/GAP210%2F12%2F2451" target="_blank" >GAP210/12/2451: Seismicita v důsledku injektáže kapalin</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Acta Geodynamica et Geomaterialia

ISSN

1214-9705

e-ISSN

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Svazek periodika

11

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

6

Strana od-do

159-164

Kód UT WoS článku

000334581300007

EID výsledku v databázi Scopus

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