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305-pp9 - UNIVERSITY OF SOUTH ALABAMA Last Time(before the...

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1 GY 305: Geophysics GY 305: Geophysics Lecture 9: Isopach Maps Isopach Maps Top of Formation maps Top of Formation maps UNIVERSITY OF SOUTH ALABAMA Last Time Last Time (before the test) (before the test) Electric Logs 3 Porosity Logs Neutron Logs Density Logs http://www.spec2000.net/07-eslog.htm Neutron Logs http://www.spwla.org/library_info/glossary/reference/glossd/images/glsp33f1.gif ...Neutron Logs also distinguish hydrogen concentration . The more H, the more adsorption. High counts=low adsorption (Low porosity) Low counts=high adsorption (high porosity) Density Logs •gamma rays interact with electrons clouds of atoms, •the gamma ray “flux” decreases with increasing numbers of electrons in the formation adjacent to the emitter CH 100: electrons = protons (Z) Atomic number (A) = protons+neutrons if you assume Z/A = 0.5, then you can then estimate apparent formation density Reported in g/cm 3 or kg/m 3 Logs used in Combination •The “crossover” effect as a gas indicator •CNL: Neutron Log
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