Figure 4. Determination of the noncompacted porosity and the long-term compressibility of the formations in Holes 975C and 974C. The porosity data (inferred from the density log) from the upper part of the borehole are inverted using Equation 8. Before the nonlinear regression, the data were averaged using a sliding window of 20 m. The values of the noncompacted porosity and the characteristic depth associated with equilibrium compaction are given on the graph.

Figure 4. Determination of the noncompacted porosity and the long-term compressibility of the formations in Holes 975C and 974C. The porosity data (inferred from the density log) from the upper part of the borehole are inverted using Equation 8. Before the nonlinear regression, the data were averaged using a sliding window of 20 m. The values of the noncompacted porosity and the characteristic depth associated with equilibrium compaction are given on the graph.