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Lecture items

Lecture items. Electric Properties of Rocks. Factors affecting resistivity of reservoirs Electrical Logs (Self Potential log, Conventional resistivity logs , Laterologs, Dual Laterologs, Microspherically focused logs, Induction logs). Factors affecting resistivity of reservoirs.

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Lecture items

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  1. Lecture items • Electric Properties of Rocks. • Factors affecting resistivity of reservoirs • Electrical Logs (Self Potential log, Conventional resistivity logs , Laterologs, Dual Laterologs, Microspherically focused logs, Induction logs).

  2. Factors affecting resistivity of reservoirs • Salinity ∞ 1/R • Temperature ∞ 1/R • Saturation ∞ 1/R • Presence of hydrocarbons ∞ R • Lithology plays an indirect role for controlling resistivity

  3. Electrical Logs - Self Potential log, - Conventional resistivity logs , - Focused resistivity Logs, - Microspherically focused logs, - Induction logs.

  4. Self (Spontaneous) Potential (SP) log Objectives • To understand the physical principles behind the operation of spontaneous potential (SP) logging. • To learn how to interpret SP logs in terms of lithology and petrophysical properties. • To understand what corrections needed to be applied to SP log before using it for interpretation.

  5. * Definition. * Units& Presentation. * Applications. * Theory of measurement. -Shale-base line& Sand line -SSP, PSP and SP log readings * Factors affecting on log readings.

  6. SP log “Definition” • The SP is a measure and record of direct current (DC) voltage differences between the naturally occurring potential of a moveable electrode in the well bore, and the potential of a fixed electrode located at the surface. • The SP log is recorded on the left hand track of the log in track #1 • It is measured in millivolts (mv).

  7. SP log “General Uses” • The SP log is used to identify impermeable zones such as shale, and permeable zones such as sand, • Detect boundaries of permeable beds, • Determination formation water resistivity(Rw), • Calculation the volume of shale in permeable beds.

  8. Theory of Measurement

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