lecture items

Lecture itemsLecture items

* Theory of measurement of other resistivity logs.

* Log formats.

* Factors affecting on log measurements.

* Applications.

MSFL, LLS and LLD logsMSFL, LLS and LLD logs

Theory of Theory of Induction Induction

logslogs

Factors affecting on resistivity Factors affecting on resistivity logginglogging

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

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

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)