Surface to borehole CSEM for waterflood monitoring in Saudi Arabia: Data analysis

Colombo, Daniele (Geophysics Technology, EXPEC Advanced Research Center, Saudi Aramco) | McNeice, Gary W. (Geophysics Technology, EXPEC Advanced Research Center, Saudi Aramco)


A baseline surface-to-borehole CSEM survey was performed in a supergiant oil field in Saudi Arabia with the objective of monitoring the evolution of the waterfront around a vertical monitoring well. Several aspects were taken into consideration including evaluation of the sensitivity of the EM measurements to the slow oil-water substitution, the transmission of large currents to the ground in a desert environment, the effects of casing and pipelines, the possibility of galvanic distortions at the surface and the modeling of the overburden anisotropic resistivity structure. The vertical electric field (Ez) provided the best sensitivity when compared to the vertical magnetic (Hz). The acquired data show good quality, good repeatability and consistent spatial variations that agree with the expected oil-water saturation distribution.

Presentation Date: Tuesday, October 16, 2018

Start Time: 1:50:00 PM

Location: 213A (Anaheim Convention Center)

Presentation Type: Oral