Baisch, Stefan and Stang, Henrik (2013) Seismic Real-Time Monitoring of the Habanero#4 Stimulation - Technical Report. Technical Report. Geothermal reservoir engineering.
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Abstract
Between November 13th, 2012 and November 30th, 2012, the Habanero#4 well was hy- draulically stimulated. Induced seismicity was monitored in real-time with a local 7 station network transmitting continuous waveform data to a central acquisition office located in the Habanero camp. Additional, 17 offline stations were operated at larger distances in order to constrain the fault mechanisms of the induced seismicity. The current report documents the technical operation of the live monitoring stations and the real-time processing of the data. Processing of data recorded by offline stations and more detailed data analyses have been performed after the operation was terminated and are provided in a separate report (GDY035). The live monitoring system was operated in 24/7 mode by two seismologists in the field supported by two seismologists working from the Q-con offices in Germany. Remote ac- cess from the German office was established by satellite link. Data was processed with Q- con’s in-house software package QUBE. Despite the extremely high seismic event rate of more than 2,700 events/day during peak-times, data processing was performed in real- time and the processing results (i.e. seismic event detections, hypocenter locations, event magnitudes) were provided to Geodynamics Ltd. on a daily basis as part of short-reports, which are attached to this document (Section 6). All automatically determined phase onset times were quality controlled by visual inspection and manually adjusted whenever neces- sary. Additionally, the QUBE traffic light system was operated to stop hydraulic operations in case the magnitude of the induced seismicity reached the pre-defined critical level of M L =3.7. The occurrence of events with magnitudes exceeding M L ≥2.5 (yellow traffic light) was reported to Geodynamics Ltd. within less than four minutes. On November 27 th , 2012 8:03 UTC, the traffic light status switched to yellow due to the occurrence of a magnitude M L =3.0 event. The monitoring system was operated without noteworthy technical issues and the system had no downtimes during the monitoring period. Event triggering was performed using an STA/LTA based detector without triggering dead-time. A total number of 27,445 reservoir events were detected with magnitudes ranging from M L =-1.6 to M L =3.0. The signal-to- noise ratio of 20,734 of these events was sufficient for determining hypocenter locations. The resulting seismicity forms a subhorizontal cloud around the injection well with a lateral extension of approx. 2 square-kilometres. The (apparent) vertical extension is in the order of several hundreds of metres and is dominated by the hypocenter location accuracy. Seismic activity is highly organized in space and time, starting close to the injection well and subsequently migrating away. These characteristics are consistent with previous ob- servations made during hydraulic stimulations in the same reservoir.
| Item Type: | Reports (Technical Report) |
|---|---|
| Subjects: | Methodology > Method and procesing > Collective properties of seismicity Region > Australia > Copper Basin Inducing technology > Geothermal energy production |
| Project: | S4CE > COOPER BASIN: geothermal energy injection experiment |