Lecture items

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

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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 - PowerPoint PPT Presentation

Transcript of Lecture items

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* Theory of measurement of other resistivity logs.

* Log formats.

* Factors affecting on log measurements.

* Applications.

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MSFL, LLS and LLD logsMSFL, LLS and LLD logs

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Theory of Theory of Induction Induction

logslogs

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Factors affecting on resistivity Factors affecting on resistivity logginglogging

Borehole sizeMud cake type and thicknessInvasion diameterBed thickness and tool resolutionDepth of investigation

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Application of Resistivity logsApplication of Resistivity logs

Saturation determinationLithology identificationSource Rock identificationLocating of hydrocarbon bearing zonesDetermination of shale volume Localization of over-pressured zonesCorrelation purposes

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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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