*4.4. Porosity and Bulk Density Measurements*

The results of porosity and bulk density measurements of the studied carbonates are listed in Table 1, while the average values per formation in Table 2. With the exception of Vigla Shales, which present the lowest measured bulk density values (2.60–2.63; average 2.62 gr/cm<sup>3</sup> ), the bulk density is quite homogeneous for all carbonate samples, ranging from 2.64 to 2.74 gr/cm<sup>3</sup> , with an average of 2.68–2.70 gr/cm<sup>3</sup> , respectively, per study formation (Table 2). On the contrary the total porosity values evaluated with the pycnometer present significant variability between the different sections and stratigraphic formations. In Agios Georgios section porosity values range between 2.31% and 9.71%, with an average value of 4.97% (Table 1). Significant porosity values above the average value for the Jurassic deposits were recorded in some horizons of this unit (samples AG10-20), where the limestones seem to be dolomitized. These values approximate the maximum porosities (~10%) that have been reported for this formation for the entire Ionian zone [33]. The total average porosity for the

Pantokrator Limestones, including both Agios Georgios and the lower part of Perivleptos sections, is 5.26% (Table 2).


**Table 1.** Porosity and bulk density measurements displayed from all the study sections.

Porosity measurements of the Perivleptos section document steadily high values for both lithostratigraphic members, with quite similar values (3.75–8.18%, average 5.91%; Table 1) for the basal Jurassic interval and the overlying Vigla Shales (3.38–8.10%, average 5.83%; Table 1). On the contrary, the typical Vigla Limestones in both Vigla section and the lower part of Koloniati outcrop display the lowest values ranging between 1.81% and 3.86% (average 2.86%) in the former and 1.28% and 5.65% (average 3.28%) in the latter (Table 1). Overall, the average porosity for Vigla Limestones, taking into account the data from both aforementioned areas, equals to 3.02% (Table 2). The analyzed samples from the upper part of Koloniati section characterized as Senonian Limestones showed steadily high porosity in the range of 3.86% to 9.26% (average 6.58%), especially at the top of this unit, where brecciated limestones with the maximum porosities of about 10% were identified (Table 1). The same range showing the tendency for increased porosity values (2.60–9.63%, average 6.44%; Table 1) was observed in Asprageli-2 section, with the hemipelagic calciturbidites and fractured resedimented microbreccia. The total average porosity measured for this Late Cretaceous carbonate unit is 6.50% (Table 2). The porosity of Asprageli-1 brecciated Paleogene limestones is in the range of 2.50–9.35% (Table 1), with the average of 5.63% (Table 2).

**Table 2.** Average porosity and bulk density values per studied formation of the Ionian zone.

