Summary_of_Well_Log_Procedures_2010 - Integrated...

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Integrated Geological-Petrophysical Interpretation of Well Logs Carlos Torres-Verd´ ın, Ph.D. Professor Zarrow Centennial Professorship in Petroleum Engineering Department of Petroleum and Geosystems Engineering The University of Texas at Austin January 24, 2010 Objective and Preface This live document is a summary of procedures, methods, assumptions, and equations commonly used to perform integrated geological-petrophysical assessments of rock formations based on well logs. The objective is to provide a succinct and systematic description to serve as reference guide with emphasis on measurement and discipline integration. Most of existing textbooks on well logging focus their descriptions to either measurement properties (be it instruments or data-acquisition systems) or to physical properties that can be used for interpretation. There are also specialized books on well logging that give detailed descriptions of a particular subject of interest, e.g. borehole imaging, sonic logging, and magnetic resonance. On the other hand, there are books on geological processes that make connections with well-log interpretation but which are often misleading and incomplete in their descriptions of measurements. Seldom do well-logging textbooks make an attempt to bridge the gap between static and dynamic petrophysical properties of rocks and well-log measurements. Even more uncommon is to Fnd textbooks on the petrophysical interpretation of well logs that make a serious attempt to include the influence of sedimentary processes on their descriptions of rock properties. These notes are an attempt to remedy the pervasive disconnection between geology, petrophysics, and borehole geophysical measurements. The author Frmly believes that the integration of the three domains of study is the best and only way to interpret well logs. Relatively recent work on carbonate formations, tight-gas sands, gas shales, and in general on unconventional hydrocarbon resources, emphasizes that petrophysical evaluations of complex rock formations are reliable only when geology, petrophysics, and measurement properties are simultaneously honored in the analysis. Presently, the notes below reflect work in progress. The author will continue to update the material as time permits based on feedback from students and interested readers. More than likely, the reader will encounter numerous typographical errors and even rough sentences. However, I have made every e±ort possible to have the material devoid of technical errors. The main disclaimer is that, albeit available for distribution to students taking my graduate and undergraduate courses, students should exercise utmost patience when I go through several editorial versions and myriad corrections in the course of one semester. My apologies in advance!
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Summary_of_Well_Log_Procedures_2010 - Integrated...

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