Variations of attenuation and V-P/V-S ratio in the vicinity of wastewater injection: A case study of Costa Molina 2 well (High Agri Valley, Italy)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10390344" target="_blank" >RIV/00216208:11320/18:10390344 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985891:_____/18:00502459

Výsledek na webu

<a href="https://doi.org/10.1190/GEO2017-0123.1" target="_blank" >https://doi.org/10.1190/GEO2017-0123.1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1190/GEO2017-0123.1" target="_blank" >10.1190/GEO2017-0123.1</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Variations of attenuation and V-P/V-S ratio in the vicinity of wastewater injection: A case study of Costa Molina 2 well (High Agri Valley, Italy)

Popis výsledku v původním jazyce

By analyzing seismicity induced by the injection of wastewater into the Costa Molina 2 well, we characterized attenuation in the area. Attenuation quality factors Q P and Q S were calculated using the peak-frequency method, which is suitable for small-magnitude earthquakes registered in the region. Anomalously high attenuation with values of effective Q(P) similar to 48 and Q(P) / Q(S) ratio of less than 1 in the vicinity of the injection well was found, in comparison with Q(P) similar to 60 for the rest of the region. Furthermore, the V-P / V-S ratio was also found to be high in the close vicinity of the injection well. We determine how sedimentary rocks possibly change their geomechanical properties due to salt-water injection and find that observed changes of attenuation (increase) and V-P / V-S ratio (increase) are consistent with the geomechanical models and experiments. Our findings indicate that the observed anomaly in the vicinity of the Costa Molina 2 well is due to the (1) changes of the properties of the rock mass affected by injection and (2) 3D structure in the overburden rocks.

Název v anglickém jazyce

Variations of attenuation and V-P/V-S ratio in the vicinity of wastewater injection: A case study of Costa Molina 2 well (High Agri Valley, Italy)

Popis výsledku anglicky

By analyzing seismicity induced by the injection of wastewater into the Costa Molina 2 well, we characterized attenuation in the area. Attenuation quality factors Q P and Q S were calculated using the peak-frequency method, which is suitable for small-magnitude earthquakes registered in the region. Anomalously high attenuation with values of effective Q(P) similar to 48 and Q(P) / Q(S) ratio of less than 1 in the vicinity of the injection well was found, in comparison with Q(P) similar to 60 for the rest of the region. Furthermore, the V-P / V-S ratio was also found to be high in the close vicinity of the injection well. We determine how sedimentary rocks possibly change their geomechanical properties due to salt-water injection and find that observed changes of attenuation (increase) and V-P / V-S ratio (increase) are consistent with the geomechanical models and experiments. Our findings indicate that the observed anomaly in the vicinity of the Costa Molina 2 well is due to the (1) changes of the properties of the rock mass affected by injection and (2) 3D structure in the overburden rocks.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Geophysics

ISSN

0016-8033

e-ISSN

—

Svazek periodika

83

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

"B25"-"B31"

Kód UT WoS článku

000443595400032

EID výsledku v databázi Scopus

2-s2.0-85038821007