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A detailed analysis of wastewater induced seismicity in the Val d’Agri oil field (Italy)
Author(s)
Language
English
Obiettivo Specifico
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
8/42 (2015)
ISSN
0094-8276
Electronic ISSN
1944-8007
Publisher
American Geophysical Union
Pages (printed)
2682-2690
Issued date
April 28, 2015
Abstract
The Val d'Agri basin in the Apennines seismic belt hosts the largest oil field in onshore Europe. High-quality recordings from a temporary dense network unravel a swarm of 111 small-magnitude events (ML ≤ 1.8) occurred in June 2006 during the first stage of wastewater injection into a high-rate well. High-precision relative locations define a pre-existing blind fault located 1 km below the well inside fractured and saturated carbonates where wastewater is re-injected. Seismicity begins 3 hours after the initiation of injection. The seismicity rate strictly correlates with injection curves and temporal variations of elastic and anisotropic parameters. Seismicity is induced by rapid communication of pore pressure perturbations along a high permeability fault-zone favorably oriented with respect to the local extensional stress field. Our accurate 3-D locations of 219 events (ML ≤ 2.2) detected by the local operator network after June 2006 concentrate on the pre-existing fault measuring 5.5-km along dip. Over the following 7½ years the seismicity rate correlates with short-term increases in injection pressure.
Type
article
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CostaMolina2_Improta_GRL_2015.pdf
Description
main article
Size
2.39 MB
Format
Adobe PDF
Checksum (MD5)
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