2-D INVERSION OF MULTI-COMPONENT INDUCTION LOGGING DATA TO RESOLVE ANISOTROPIC RESISTIVITY STRUCTURE

摘要

High Definition Inductio Logging (HDIL) tools (10) can provide reliableinformation about the vertical and radial variations of resistivity (Rh1, Rv1,Rhi, Rvi) structure in isotropic media (201a, 201i). This type of logging toolutilizes transmitter-receiver arrays (101, 103, 105, 107, 109, 111, 113, 115)coaxial with the borehole (2) and thus cannot provide information aboutanisotropy in vertical wells. This greatly limits the application of arrayinduction tools in the characterization of reservoirs with finely laminatedsand/shale (4A-4E) sequences. A multi-component induction 3DEX tool providesthe much needed ability to detect anisotropy for sand-shale laminatedreservoirs. Data from such a logging tool lacks the radial resolution providesby array induction tools. Joint inversion of HDIL and 3DEX data is able toidentify parameters of the invaded zone as well as anisotropic formations.