USC_Sec_5_Resistivity_3pp_ppt

USC_Sec_5_Resistivity_3pp_ppt - PTE-461 Formation...

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1 Donald G. Hil , Ph.D., R.Gp, R. G., R.P.G., L.P.Gp. dgh@hil petro.com PTE-461: Fal 2007 Section 5: Resistivity Slide No.: 1 PTE-461 Formation Evaluation Fall Semester, 2007 Section 5 Resistivity Donald G. Hil , Ph.D., R.Gp, R. G., R.P.G., L.P.Gp. dgh@hil petro.com PTE-461: Fal 2007 Section 5: Resistivity Slide No.: 2 Why Run Well Logs • For stratigraphic and structural correlation • To be able to identify pay zones • To quantify reserves estimates Donald G. Hil , Ph.D., R.Gp, R. G., R.P.G., L.P.Gp. dgh@hil petro.com PTE-461: Fal 2007 Section 5: Resistivity Slide No.: 3 Field Vectors Force, F , Electric Field, E , Electric Displacement, D Polarization, P , are all vectors (first rank tensors) and are directional. Electric Charge, q is a scalar (zero rank tensor) and has no directional properties Electrical Permittivity, ± , and dielectric constant, ² e , are second rank tensors, and are directional
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2 Donald G. Hil , Ph.D., R.Gp, R. G., R.P.G., L.P.Gp. dgh@hil petro.com PTE-461: Fal 2007 Section 5: Resistivity Slide No.: 4 Magnetic Properties and Magnetic Field Vectors Force, F, Magnetic Field Intensity, H, Magnetic Induction, B, Magnetic (macroscopic) Polarization, M, and Magnetic dipole, m, are all vectors (first rank tensors) and are directional. Magnetic permeability, μ , and relative magnetic permeability, ± m , are second rank tensors and are directional. Donald G. Hil , Ph.D., R.Gp, R. G., R.P.G., L.P.Gp. dgh@hil petro.com PTE-461: Fal 2007 Section 5: Resistivity Slide No.: 5 Circuit Element Analogues • Resistance: – linear response – current is in phase with voltage • Capacitance: Current opposes voltage changes – Current lags voltage • Inductance: Voltage opposes current changes – Current leads voltage Donald G. Hil , Ph.D., R.Gp, R. G., R.P.G., L.P.Gp. dgh@hil petro.com PTE-461: Fal 2007 Section 5: Resistivity Slide No.: 6 Disk-Shaped Measurement Sample • Current density is distorted at sample edges • Sample geometrical factor is given by: G = S ' L ± ² ³ ´ µ where: S’ is the electrode area, corrected for E distortion, at the edges
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3 Donald G. Hil , Ph.D., R.Gp, R. G., R.P.G., L.P.Gp. dgh@hil petro.com PTE-461: Fal 2007 Section 5: Resistivity Slide No.: 7 Guarded (Disk) Sample Holder Center electrode and outer ring maintained at same potential, relative to full disk electrode Current density distorted at edge of outer electrode, only Geometrical factor is: G = S o L ± ² ³ ´ Note: There is no E distortion correction needed for S o Donald G. Hil , Ph.D., R.Gp, R. G., R.P.G., L.P.Gp. dgh@hil petro.com PTE-461: Fal 2007 Section 5: Resistivity Slide No.: 8 Cylindrical Shell Sample • Cylindrical sample – Center bored out surfaces are concentric cylinders • Electrodes placed on inner and outer wall – Cylindrical analogue of disk sample – Current density distorted at top and bottom edges of electrodes
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This note was uploaded on 02/27/2008 for the course PTE 461 taught by Professor Donhill during the Fall '07 term at USC.

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USC_Sec_5_Resistivity_3pp_ppt - PTE-461 Formation...

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