Determine values for surface porosity , and porosity decline constant K for the Santa Barbara chan- nel. Use the average bulk density data shown in Fig. 6.55, an average grain density of 2.60, and an average pore fluid density of 1.014 g/cm3. Answer: 6.=0.34; K=0.00019 ft-. (1) Sediment Thckness (3) Average Density Porosity (2) Bulk (t) (g/cm) (frac.) 1.95 2.02 2.06 2.11 2.16 2.19 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10.000 11,000 12,000 13,000 14,000 15,000 16,000 17,000 18,000 19,000 20,000 0.43 0.38 0.35 0.32 0.29 0.27 0.24 0.22 0.20 0.18 0.16 0.15 2.24 2.27 2.29 2.33 2.35 2.37 2.38 2.40 2.41 2.43 2.44 2.45 2.46 2.47 2.48 0.14 0.13 0.12 0.11 0.10 0.098 0.092 0.085 0.079