| 摘要 |
<p>NMR measurements made in a borehole are susceptible to contamination by signals from the borehole fluid. Correction is made for this contamination by using a standoff measuring device to determine the fractional volume of the region of investigation of the NMR tool that lies within the borehole. (See Figure 2 Steps 151, 153, 157, 159, 161) Using known or determined characteristics of the borehole fluid, (See Fig. 2 steps 151, 153, 157, 159, 161, 163, 165) a correction is made either to the NMR signals prior to processing or to the processed results of the uncorrected signals (See Fig. 2 steps 167, 169, 171).</p> |
