PETE311_06A_Class16_(Maggard)

PETE311_06A_Class16_(Maggard) - Electrical Properties of...

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Unformatted text preview: Electrical Properties of Reservoir Rocks DETERMINING FLUID SATURATIONS 1. Conventional core analysis 2. Capillary pressure measurements 3. Well log analysis Methods of Determining Saturations Well Log SP Resistivity PENHOLE LOG EVALUATION From NExT, 1999 Most abundant data for formation evaluation and determination of fluid saturations RHOMBIC PACKING OF SPHERES •Electrical properties of reservoirs vary strongly with porosity and characteristics of the fluids in the pore space; usually, basic properties are determined assuming: • “clean” reservoir rock (non-shaly) • S w = 1.00 (water saturated rock) RESISTIVITY Resistivity Resistivity is an intensive rock/fluid property, and is a measure of (the inverse of) the electrical flow capacity of the rock •Resistance is extensive and for linear, 1-D electrical flow, r=(R ·L)/A •r electrical resistance, Ω •R electrical resistivity, Ω ·m •L length of electrical flow path, m •A cross-sectional area perpendicular to electrical flow path, m 2 RESISTIVITY – DEFINITION OF THE OHM-METER From Halliburton (EL 1007) RESISTIVITY...
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This note was uploaded on 12/03/2009 for the course PETE 311 taught by Professor Staff during the Spring '08 term at Texas A&M.

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PETE311_06A_Class16_(Maggard) - Electrical Properties of...

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