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The time-dependent neutron diffusion equation, -D v2 $(F;t) + C,+ = -; where: 2 + S(

Figure 3-19 shows the thermal neutron decay for a 38% porous quartz sand containing water with 95,000 ppm salinity. Time zero represents the end of the neutron burst. The initial rapid decay is due to borehole effects. When the background counting rate is subtracted from the values of curve A, curve B with extendedstraight-line portion results. Borehole Effects I ‘O 0 I II 500 I I 1000 I I I 1500 2000 Time (ps) after Neutron Burst Fig. 3-19-Background counts are subtracted from total to give true exponential decay curve 1 1 0 Fig.

Porosity and lithology changescan causecount rate profiles similar to those encounteredin gas zones. The inelastic count rate from the Dual-Burst TDT tool far detector (INFD) curve helps to solve this problem. The INFD is sensitive to gas but not to porosity. Conventionally, the zone at 4910 ft would be interpreted as gas from the far/near count separation. However, INFD does not increase, indicating no gas effect. bed which appears between higher porosity sandstones. Openhole density/neutron logs through a sand/shale sequenceare displayed in track 1 of a Dual-Burst TDT log in Fig.

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