Porosity and Permeability in Bioturbated Sediments - Trace Fossils as Indicators of Sedimentary Environments - page 828

FIGURE 11 Biogenically modified flow media from the Late Jurassic Ula Formation, Norwegian North Sea. (A) Minipermeametry of a weakly defined textural
heterogeneity for well 7/12-6, depth 3,439.00 m. From the contour map, it is apparent that the higher permeabilities are localized along well-defined burrow networks.
This suggests that the arithmetic mean represents fluid flow along the most permeable conduits. Because of small-scale heterogeneities within the sample (i.e., burrow
mud linings), the k arithmetic is only at 88.18 mD at 100% bioturbation (green star). This is opposed to the idealized 100% bioturbation intensity, which predicts 152 mD
(red star). (B) Minipermeametry of a cryptic textural heterogeneity for well 7/12-6, depth 3,503.00 m. The highest permeabilities in this section are a result of higher
levels of sediment reworking by microorganisms. Therefore, utilization of the geometric mean would be the most accurate for examples of cryptic bioturbation