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|Authors: ||Heinicke, J.*|
|Title: ||Anomalous fluid emission of a deep borehole in a seismically active area of Northern Apennines (Italy)|
|Title of journal: ||Applied Geochemistry|
|Series/Report no.: ||/25 (2010)|
|Issue Date: ||25-Jan-2010|
|Abstract: ||The Miano borehole, 1047 m deep, is located close to the river Parma in the Northern Apennines, Italy. A
measuring station has been installed to observe the discharge of fluids continuously since November
2004. The upwelling fluid of this artesian well is a mixture of thermal water and CH4 as main components.
In non-seismogenic areas, a relatively constant fluid emission would be expected, perhaps overlaid
with long term variations from that kind of deep reservoir over time. However, the continuous record of
the fluid emission, in particular the water discharge, the gas flow rate and the water temperature, show
periods of stable values interrupted by anomalous periods of fluctuations in the recorded parameters. The
anomalous variations of these parameters are of low amplitude in comparison to the total values but significant
in their long-term trend. Meteorological effects due to rain and barometric pressure were not
detected in recorded data probably due to reservoir depth and relatively high reservoir overpressure.
Influences due to the ambient temperature after the discharge were evaluated by statistical analysis.
Our results suggest that recorded changes in fluid emission parameters can be interpreted as a mixing
process of different fluid components at depth by variations in pore pressure as a result of seismogenic
stress variation. Local seismicity was analyzed in comparison to the fluid physico-chemical data. The
analysis supports the idea that an influence on fluid transport conditions due to geodynamic processes
exists. Water temperature data show frequent anomalies probably connected with possible precursory
phenomena of local seismic events.|
|Appears in Collections:||04.02.01. Geochemical exploration|
Papers Published / Papers in press
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