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Lecture items

Lecture items. * Theory of measurement of other resistivity logs. * Log formats. * Factors affecting on log measurements. * Applications. MSFL, LLS and LLD logs. Theory of Induction logs. Factors affecting on resistivity logging. Borehole size Mud cake type and thickness

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Lecture items

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  1. Lecture items * Theory of measurement of other resistivity logs. * Log formats. * Factors affecting on log measurements. * Applications.

  2. MSFL, LLS and LLD logs

  3. Theory of Induction logs

  4. Factors affecting on resistivity logging • Borehole size • Mud cake type and thickness • Invasion diameter • Bed thickness and tool resolution • Depth of investigation

  5. Application of Resistivity logs • Saturation determination • Lithology identification • Source Rock identification • Locating of hydrocarbon bearing zones • Determination of shale volume • Localization of over-pressured zones • Correlation purposes

  6. Where:      Sw  = water saturation      F    = formation factor (a/fm)      a    = tortuosity factor      m   = cementation exponent      Rw = resistivity of formation water      Rt  = true formation resistivity as measured by resistivity log      n    = saturation exponent (most commonly 2.0)

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