![]() ![]() The normal compaction trend (NCT) is a straight line in log-linear space that has been fitted to the decrease in slowness as a function of depth where sediments are normally compacting. 1-Illustration of the equivalent depth method using sonic ΔT. Because the value of the measured physical property is a unique function of effective stress, the pore pressure at any depth where the measured value is not on the NCT can be computed fromįig. ![]() When the log of a measured value is plotted as a function of depth, NCTs can be displayed as straight lines fitted to the data over the normally compacted interval. This method first assumes that there is a depth section over which the pore pressure is hydrostatic, and the sediments are normally compacted because of the systematic increase in effective stress with depth. One example of analysis using a trend line is the equivalent depth method illustrated in Fig. Methods to determine pore pressure Equivalent depth methods 1.5 Sonic method with depth-dependent normal compaction trendline (NCT).1.4 Resistivity method with depth-dependent normal compaction trendline (NCT). ![]()
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