Enhanced oil recovery is routinely performed by water flooding in the Tazlau field in Eastern Romania. By the end of 2013, a borehole microseismic feasibility study was launched to gain better understanding of the producing reservoir behavior. Two wells were equipped with 8 geophones in approximately 1000 meters depths in two consecutive periods coinciding with the initiation of the injection phase. In the first well, a significant amount of microseismic events (2566) was recorded during 14 monitoring days, in contrast to a very small number of events (54) observed in the second well in the following 14-day period. This significant difference is related to the varying fracture density in the area and, to a lesser degree, to the amount of injected water.

In general, event hypocenters can be located within distances of 600 meters from the monitoring well with sufficient accuracy, and their moment magnitudes range from -1.5 to -3.5. Fracture network characterization based on the microseismic pattern is supported by the analysis of fullbore formation imaging. The study provides new insight on potential water paths. We conclude that borehole microseismic monitoring appears as a promising and useful technique for steering water injection.


Article metrics loading...

Loading full text...

Full text loading...


  1. Drew, J., Leslie, D., Armstrong, P. and Michaud, G.
    [2005] Automated microseismic event detection and location by continuous spatial mapping. Society of Petroleum Engineers Annual Technical Conference and Exhibition, Paper 95513
    [Google Scholar]
  2. Jones, R.H., Raymer, D., MuellerG., Rynja, H. and MaronK.
    , [2004] Microseismic monitoring of the Yibal oilfield. 69th EAGE Conference & Exhibition, Extended Abstracts, H011.
    [Google Scholar]
  3. Jervis, M. and Dasgupta, S.N.
    [2007] Recent Microseismic Monitoring Results from VSP and permanent Sensor Deployments in Saudi Arabia. EAGE Workshop on Passive Seismic, Extended Abstracts, A10.
    [Google Scholar]

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error