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305-pp8 - UNIVERSITY OF SOUTH ALABAMA Last Time Electric...

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1 GY 305: Geophysics GY 305: Geophysics Lecture 8: Electric (Wire Line) Logs 3: Electric (Wire Line) Logs 3: Porosity Logs (Neutron and Density) Porosity Logs (Neutron and Density) UNIVERSITY OF SOUTH ALABAMA Last Time Last Time Electric Logs 2 Radioactive decay types Gamma Ray Emission Gamma Ray logs Radioactive Decay Three modes of decay 1) Alpha Decay Loss of alpha particle Convert parent into element that has nucleus containing two fewer protons 2) Beta Decay Loss of beta particle Convert parent into element whose nucleus contains one more proton by losing an electron 3) Gamma Decay Capture of beta particle Convert parent into element whose nucleus has one less proton But gamma ray emissions occur in all types of decay Gamma Ray Emissions Each isotope has a specific emission energy… Potassium: 1460 KeV Thorium series: 2620 KeV Uranium-Radium: 1760 KeV Gamma Ray Logs http://www.geomore.com/Electric%20Logs.htm •Gamma ray logs record the radioactivity of a formation. •Shales (or clay-minerals) commonly have a relatively high gamma radioactive response, and consequently gamma ray logs are taken as good measures for grain size (and subsequently inferred depositional energy). •Sand, which contains little mud, will have low gamma ray value, while a fine mud will have a high gamma ray value. The values range of gamma ray is measured in API (American Petroleum Institute)
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