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Method and system for removing effects of conductive casings and wellbore and surface heterogeneity in electromagnetic imaging surveys
Method and system for removing effects of conductive casings and wellbore and surface heterogeneity in electromagnetic imaging surveys
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机译:消除电磁成像勘测中的导电套管,井筒和表面异质性影响的方法和系统
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摘要
Characterizing a reservoir with electromagnetic imaging surveys includes normalizing measured voltage data by transmitter moment, sorting the normalized voltage data into common receiver profiles, densely resampling transmitter locations using common positions for the receiver profiles, coarsely resampling the data at discreet transmitter locations, defining a starting model for inversion, weighting the data by a factor, converting the normalized voltage data to ratios, calculating a conductivity image using a ratio inversion method, and verifying that an inversion has converged and the image is geologically reasonable. The image can then be displayed. The invention can be used for cross-well, surface-to-borehole, borehole-to-surface, and single-well (borehole-to-borehole) measurements measurements by which the effects of steel casing are reduced.
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