By Daniel A. Krygowski
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6 in. u. 30-44 in. 6 in. u. 20 in. 8 in. NA thermal epithermal Gammaneutron *with enhanced resolution processing © 1999 Halliburton Operational Constraints The tool can be run: open hole centered cased hole eccentered In a borehole fluid of: gas or air water or water-based mud oil or oil-based mud Logging speed: 60 feet/minute. May require slower speeds for enhanced resolution processing. Comments: Guide to Petrophysical Interpretation © 1995, 2000, 2003 Daniel A. Krygowski, Austin Texas USA NEU 3 Porosity Neutron Measurement Names Measurement names preceded by an asterisk (*) are not listed in current acquisition company literature, and may no longer be available, or are obsolete.
10 Variable response with lithologic mix, but Neutron generally greater than Density. 3 to 5. 10 Variable response with lithologic mix, but Neutron generally less than Density. 2 to 3. 10 Highly variable, with Neutron greater or less than Density, depending on the lithologic mix. 2 to 5. Shale -- As described in the Shale section above. As above. Guide to Petrophysical Interpretation © 1995, 2000, 2003 Daniel A. 65 g/cm3). Note the Neutron-Density crossover in the limestone zone. Guide to Petrophysical Interpretation © 1995, 2000, 2003 Daniel A.
Guide to Petrophysical Interpretation © 1995, 2000, 2003 Daniel A. Krygowski, Austin Texas USA SON 8 Porosity Sonic/Acoustic Like the Wyllie equation, Raymer-Hunt-Gardner is based on empirical data. It is non-linear in form, resulting in lower porosities than Wyllie for high DT, as in uncompacted sands. No compaction correction is needed. The choice of which equation to use depends on the interpreter. If other porosity information is available, as from cores, choose the equation which best fits the supporting data.
Guide to Petrophysical Interpretation by Daniel A. Krygowski
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