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Title of paper Time-lapse 3D CSEM for reservoir monitoring based on rock physics simulation
List of authors Author, E., Co-author, W., Co-author, L.
Affiliation(s) Norwegian University of Science and Technology, Norwegian University of Science and Technology, Norwegian University of Science and Technology
Summary Marine controlled-source electromagnetic (CSEM) method measures EM fields transmitted by an active source either at seafloor or a few tens of meters above the seafloor, therefore it can image the electrical resistivity beneath the seafloor. Being able to resolve resistivity anomalies of high saturations of petroleum, marine CSEM sounding has gained increasing popularity after its introduction in 1981 by Cox. Nevertheless, the EM research community starts to extend its applications from petroleum exploration to an active production
monitoring tool. Our study focuses on the latter.
By utilizing various dynamic reservoir properties made available through reservoir simulation of the Wisting field located in the Norwegian part of the Barents Sea, a realistic geoelectric model was created. To this end, we develop geologically consistent rock physics models, such that the available simulation results can be transformed into resistivity maps. We show that the resistivity map pertaining to each time-step can be used as an input model in a Finite Difference Time Domain (FDTD) forward modeling workflow to produce synthetic EM data. This synthetic EM data can be studied and analyzed in light of production induced changes in the reservoir for different production phases. This will allow us to acquire insights towards developing a technically feasible reservoir monitoring workflow suitable for time-lapse CSEM. Our result shows that at different production phases, the CSEM responses are different. Therefore, the method can be effectively used for production monitoring purpose. Moreover, this study will enable the testing of other time-lapse workflows with realistic complexities evaluating the potential of this technology for field application, through investigating the resolution limitations and the repeatability requirements.
Session Keyword 3.0 Exploration, Monitoring and Hazards
File upload 3.0_time-lapse_3d_csem_for_re_ettayebi.pdf
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