Effluent Injection Operation

Monitoring method: Full Wave Location

The Situation

A terrigenous water saturated reservoir situated between high amplitude salt domes was used for waste disposal, pumped with industrial sewage via seven injection wells for nearly 20 years.

The Approach

The Full-Wave Location methodology was carried out to detect the change in microseismic activity induced by the injection process. Additionally, hydrodynamic modelling was used to map the radial distribution of activity away from the injection zone. The image on the left represents the results from the first central block. Two linear zones of increased microseismic activity are clearly visible in the activity map attributed to the boundary of the pressure front. A further difference in the distance of the front in the West and East areas from the injection zone can also be observed. The small distance observed to the East was identified to be caused by the presence of a salt dome.
The image on the left presents the results from the first central block. Two linear zones of increased microseismic activity are clearly visible in the activity map attributed to the boundary of the pressure front. A difference in distance of the front in the West and East areas from the injection zone is further observed. The small distance observed to the East was identified to be caused by the presence of a salt dome.

Results

  • Two linear zones of increased microseismic activity, associated with the boundary of the pressure front, were identified
  • High levels of microseismic activity were observed in close proximity to the injection well
  • Explicit breakthrough filtration channels were not observed
  • The study allowed for the zone of distribution of industrial effluent within the reservoir to be observed and mapped

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