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Unformatted text preview: 1 GY 305: Geophysics GY 305: Geophysics Lecture 5: Lecture 5: Electric (Wire Line) Logs 1: Electric (Wire Line) Logs 1: SP Logs SP Logs UNIVERSITY OF SOUTH ALABAMA Last Time Last Time Petroleum Geology Part 2 Migration of petroleum (continued) Reservoirs Trapping Mechanisms Porosity Petroleum Reservoirs Petroleum Reservoirs Petroleum reservoirs are rock units that contain recoverable quantities of crude oil, distillate and/or natural gas. Almost always sedimentary in nature Must be both porous and permeable ht p:/ www.indiana.edu/~librcsd/etext/hoosier/image/og-13.jpg Trapping Trapping Mechanisms Mechanisms ht p:/ www.geomore.com/images/TRAPS.jpg Come in different flavors 1) Stratigraphic (e.g., pinchouts) 2) Structural (e.g., anticlines) 3) Sedimentary (e.g., facies and/or porosity changes) 4) Combinations of any of the above Porosity Porosity Also comes in many flavors: 1) Primary (depositional): a) interparticle b) framework c) fenestral 2) Secondary: a) dissolution (moldic, oomoldic, vuggy) b) intraparticle/intracrystalline/intercrystalline b) fracture Porosity Primary (Interparticle) 2 Electric Logs 1 Introduction (first electric logs) Resistivity Logs SP Logs (Spontaneous Potential) Today Today s Agenda s Agenda Electric Logs Used to gather information about lithology, fluid...
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This note was uploaded on 02/05/2012 for the course GLY 305 taught by Professor Staff during the Fall '10 term at S. Alabama.
- Fall '10