Seismic Control During a Reinjection Experiment in the Viterbo Region (Central Italy)

摘要

In connection with a reinjection experiment in the Viterbo region a seismic control program was executed before, during, and after the reinjection. The gravity flow of water into the well lasted nine days with a rate ranging from 3.5 to 35.5 liters/sec. Seismic surveys were performed continuously. The background noise level during the night is 10 to the minus 5 cm/sec while during the day it is more than 10 to the minus 3 cm/sec due to human activity. A wide range of noises of both natural and anthropogenic sources were recorded and classified as to frequency, amplitude and period. Analysis of the characteristics and recording results showed that seismic or microseismic events caused by hydrocracking related to fluid injection had occurred. (ERA citation 03:008241)