Audio-frequency cross-borehole electromagnetics (EM) is aninteresting alternative to existing techniques for reservoir characterization. With this method signals may be propagated several hundreds of meters &rough typical sand/shale reservoirs and data may be collected at high accuracy with a high sensitivity to thk subsurface resistivity A vertical component, cross-borehole EM field system has been designed and built by Lawrence Livermore and Lawrence Berkeley laboratories for reservoir evaluation and monitoring. This system was deployed at the British Petroleum test facility in Devine, Texas for testing. The site is in a region of simple, flatlying geology so that collected data could be unambiguously interpreted with layered models. The results of the test showed that crosshole EM profiles in wells spaced 100 meters apart data could be repeated in 24 hours to better than one percent and that the profile data could be fit to layered models within this same tolerance.The derived models showed a close correspondence with the borehole induction log.
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