Passive monitoring at the field of hydrocarbons is carried out by recording the signals of micro-seismic emission at the surface using a seismic antenna, located in the epicentral zone of emission sources and specialized data processing based on cluster computing.
Solved problem with passive monitoring:
- The hydraulic fracture monitoring.
- Monitoring of the displacement front.
- Determining areas of supply wells.
- Identification of fault-block structure near a bottom of the well.
- Monitoring of the filter activity after hydraulic fracturing (HF).
Registration. Used scheme of microseismic monitoring involves the control stimulation, including production fluid and injection fluid to maintain reservoir pressure. A continuous check is conducted not less than 14 days. The time of mobilization of the field crew is not more than 10 days, demobilization – 3 days.
Equipment. Field work is conducted with the use of digital seismic stations Scout (Fig. 1) equipped with seismic sensors GS-One. The equipment allows to register the data with the following parameters:
- synchronicity records with an error of no more than 100 microseconds,
- sampling frequency at least 1 kHz,
- the working frequency range of 5-200 Hz,
- continuity check up to 28 days.
Used differential GPS receiver to measure relative coordinates of the seismic sensors with high accuracy.