Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010geoji.181..741w&link_type=abstract
Geophysical Journal International, Volume 181, Issue 2, pp. 741-755.
Astronomy and Astrophysics
Astronomy
3
Numerical Approximations And Analysis, Downhole Methods, Electrical Properties
Scientific paper
We carried out a series of numerical simulations in a complex 3-D resistivity model to investigate the feasibility of using controlled-source electromagnetics on land for monitoring changes in a hydrocarbon reservoir during production. Displacement of oil by saline water injection changes the resistivity. The modelling allows a comparison of the measured time-lapse EM signal to various sources of noise that can be expected in a field experiment, for instance, magnetotelluric signals, repeatability errors and near-surface resistivity changes caused by seasonal variations. Our estimates show that land CSEM monitoring should be feasible, though not easily, for the example considered here, a thick reservoir at a depth of about 1 km. The trade-off between signal strength and repeatability errors requires the source to be located at some distance from the reservoir. Measurements in a monitoring well suffer less from surface noise. Measuring the vertical electric component in a well, placed at some distance from the reservoir, provides the best result.
Mulder Wim A.
Slob E. C.
Wirianto M.
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