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Penilaian Formasi Lanjutan

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Resistivity LogsInduction Logs

R. Widijanto

November 10, 2006

2V 1 - 2006

Agenda

♦ Basic Principle of Induction Logs1. Induction Principle2. Depth of Penetration3. Borehole Effects4. Bed Thickness Effects

♦ The Spherically Focused Log (SFL)1. Log Presentation

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Basic Principle of Induction Logs

1. Range of Application of Induction Log and Laterolog2. Induction Principle3. Simple two-coil induction measuring system4. Practical Induction Array5. Depth of Penetration of Induction Log6. Borehole Corrections for ILd and ILm7. Dual Induction Focused Log8. Effects of Bedding on Induction Responses9. Bed Thickness Correction to Deep Induction

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Range of Application of Induction Log and Laterolog

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Induction Principle

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Simple two-coil induction measuring system

Principle of the measurement is that the voltage induced in the receiver coil is proportional to the ground loop current, and therefore, proportional to the formation conductivity.

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Practical Induction Array

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Depth of Penetration of Induction Log

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Borehole Corrections for ILd and ILm

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Dual Induction Focused Log

Measures deep resistivity of the formation or close to the true resistivity (Rt)

Measures the medium resistivity of the formation or resistivity of the invaded zone(Ri)

Shallow focused laterolog measures the shallow resistivity of the formation or the resistivity of the flushed zone (Rxo)

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Effects of Bedding on Induction Responses

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Bed Thickness Correction to Deep Induction

6 ft. (1.8 m)

5 ft. (1.5 m)

4 ft. (1.2 m)

3 ft. (0.9 m.)

Rcor (Ω - m)

Rlo

g ( Ω

- m

)

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Tornado Charts

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Induction Resitivity Tool SummaryWireline

Schlumberger Halliburton Baker-Hughes Atlas

Welex GearhartDual Induction Log (DIL) DIL DIL Dual Induction Focused Log (ILD/ILM/SFL) (DIND/MIND/GUARD) (ILD/ILM/LLS) (RILD/RILM/RFOC)

Phasor Induction Log High Resolution Induction (HRI) Dual phase Induction Log (RIDPH/RIMPH/RSFL) (HDRS/HMRS/LL3) (RIPD/RIPM/RSFL)

Array Induction Tool (AIT) High Definition Induction Log (HDIL) (AT10/AT20/AT30/AT60AT90…) (M2RX/M2R9/M2R6/M2R3/M2R1…)

3D Induction Explorer (3DEX)(RESH/RESV…)

Measurement While Drilling

Anadrill Halliburton Baker-Hughes Pathfinder Sperry-Sun Gearhart Spun-off Halliburton

Compensated Dual Res. Electromagnetic Wave Res. Electromagnetic Propagation Res Compensated Wave Res(CDR, ARC5) (EWR, Phase 4, Slim Hole Phase4) (DPR, MPR, (CWGRD)

Reservoir Navigator Service)

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Induction Summary

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The Spherically Focused Log (SFL)

1. Principle of the Spherically Focused Log2. Depths of Penetration of the Shallow Res Curve3. Typical Presentation of Dual Induction-SFL4. Invasion Correction Chart for Dual Induction-SFL

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Principle of the Spherically Focused Log

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Depths of Penetration of the Shallow Res Curve

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Typical Presentation of Dual Induction-SFL

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Invasion Correction Chart for Dual Induction-SFL

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Comparations

♦ Induction Logs• Work best in Fresh Muds• Medium to high porosity conditions• Can be recorded in oil-base mud• Can be recorded in empty hole

♦ Lateralogs• Work best in Salt Muds• Low porosity conditions• High formation resistivity

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Resources♦ Course Materials: http://www.geocities.com/ridwanwd/PFL/

♦ The Society of Petrophysicists and Well Log Analysts:www.spwla.org

♦ Society of Petroleum Engineers: www.spe.orgFormation Evaluation: http://www.spe.org/spe/jsp/basic/0,,1104_1714_1003934,00.html

♦ Schlumberger Interpretation Chart: www.slb.com or http://content.slb.com/Hub/Docs/connect/reference/Chartbook/

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Question?