Opening_2011 - Fundamentals of Well Logging PGE368 Spring...

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Fundamentals of Well Logging Instructor: Dr. Carlos T. Verdín Unique No. 19570 PGE368 Spring 2011 INSTRUCTOR: Carlos Torres-Verdín, Ph.D. Professor Zarrow Centennial Professorship in Petroleum Engineering Department of Petroleum and Geosystems Engineering The University of Texas at Austin http://uts.cc.utexas.edu/~cefe/index2.html
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COURSE DESCRIPTION Introduction to Qualitative and Quantitative Formation Evaluation Principles Via Well Logs, Core Measurements, and Geological Information Estimation of petrophysical properties from well logs Wells and Well-Logging Tools
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Well Logging Tools Wells and Well Logging
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WHAT IS A WELL LOG? Interpreting a Well Log is in some ways similar to solving a SUDOKU puzzle!! BALANCE and CONSERVATION constraints are important!
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REMARK: Classical Well Log Analysis And FORMATION EVALUATION Are NOT the same!!! Integrated Formation Evaluation CORE DATA PETROPHYSICS MEASUREMENT PHYSICS, CHEMISTRY, and FLUID PROPERTIES GEOLOGY
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Pore scale Core plug scale Stratum scale Bedding scale Well logs THE ROAD FROM THE MICRO-SCALE TO WELL LOGS … SEM ( μ m) 1 cm THIN SECTIONS CORES 6 in 6-12 in Pore scale Core plug scale Stratum scale Bedding scale Well logs … THE ROAD FROM WELL LOGS TO THE MACRO-SCALE CROSS-WELL (1-10 m) 6-12 in SEISMIC DATA (10-50m) VSP (5-15 m)
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What does the trained eye see? Resistivity Gamma Ray Density Porosity Logging Tool The Reverse Process Resistivity Gamma Ray Density Porosity
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Rule No. 1 (the golden rule) : A well log is ALWAYS associated with an outcrop Outcrop Analogues Rock!!
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OUTCROP ANALOGUES CORE SCALE PORE SCALE SEM SCALE
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Show me the money!! What are the porous and and permeable rocks? What are the in-place hydrocarbon reserves? What are the petrophysical properties of the hydrocarbon-bearing formations ? Is the hydrocarbon-in-place producible? What are the best completion and production strategies? permeability ( k), porosity ( ≡φ ), & saturation ( S) 1. Assessment of quality of log measurements (are the logs truly representative of rock formation properties?) 2. Lithology identification from logs (sand, shale, limestone, dolomite, anhydrite, tuff, etc.) 3. Identification of porous and permeable flow units 4. Identification of fluids (mud filtrate, water, oil, and/or gas) 5. Assessment of porosity 6. Assessment of hydrocarbon saturation
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Opening_2011 - Fundamentals of Well Logging PGE368 Spring...

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