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| Titel |
Application of a Waveform Similarity- Based Location Algorithm to the Basel 1 Microseismic Data |
| VerfasserIn |
Joern Kummerow, Anton Reshetnikov, Serge A. Shapiro, Hiroshi Asanuma, Markus O. Häring |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055120
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| Zusammenfassung |
| The stimulation of the Basel 1 well at the Deep Heat Mining Project in Basel, Switzerland,
was accompanied by the occurrence of a high rate of micro seismic activity. Magnitudes of
the largest events exceeded the value of ML > 3, which finally led to the suspension of the
project. We analyzed 2834 micro seismic events with magnitudes -1 -¤ ML -¤ 3.4. They
were recorded by a downhole seismic monitoring system in a six month time period which
covers both the stimulation phase from December 02 to December 09, 2006, and the
post-injection phase until June 07, 2007. Here, we present a location work-flow to determine
high- resolution hypocenters. New P and S wave arrival times for 2834 events recorded by six
downhole geophones were determined by an iterative optimization procedure. 2138 events
could be located reliably with an average rms misfit of only 3ms and minimum 8 arrival time
measurements. We further refined the locations of multiplet events by applying a recently
introduced location algorithm which uses a combination of arrival times and cross
correlation values. It is shown that for the largest multiplet consisting of 109 events, the
width of the seismically active streak is of the order of 20m. The high- precision
locations are a precondition for using the micro seismicity to image the fine-scale
structure of the Basel reservoir and for analyzing in detail the spatial-temporal
distribution of the Basel 1 micro seismic data, in particular of the multiplet events. |
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