Understanding and overcoming risks of CSEM for reservoir monitoring

Davydycheva, Sofia (KMS Technologies) | Hanstein, Tilman (KMS Technologies) | Smirnov, Maxim (KMS Technologies) | Strack, Kurt (KMS Technologies)

OnePetro 

A new technology for reservoir monitoring includes full field controlled-source electromagnetics (CSEM) and microseismics. To mitigate the risk, we have developed full technology cycle: from patents, hardware, acquisition methodology, to data processing and interpreting in 3D. The system can acquire surface-to-surface and surface-to-borehole measurements. EM data are used to track fluids, due to their high sensitivity to the fluid resistivity while seismic data relate primarily to the reservoir boundaries. Having seismic and EM sensors in the same recording unit allows the addressing of the multi-physics character of the problem early on in the workflow. The system enables acquiring large number of EM data channels at low cost similar to what is done with seismic data.

Typical risks are lack of EM image focus, formation resistivity anisotropy and unaccounted effects of steel casing(s). To mitigate these risks, we apply careful 3D modeling feasibility studies and acquire dense EM field data. In addition, we apply a novel method to focus the EM image information directly below the receiver. Operational risks include low signal-to-noise (SNR) ratio, issues related to the transmitter stability, to the stability of the groundings, and data processing inefficiency. Understanding and mitigation of these risks is key to successful reservoir monitoring job.

Presentation Date: Tuesday, October 16, 2018

Start Time: 9:20:00 AM

Location: Poster Station 15

Presentation Type: Poster