Comparative study of methods to estimate hydraulic parameters in the hydraulically undisturbed Opalinus Clay (Switzerland)

Swiss Journal of Geosciences

Table 5 Specific storage coefficients (S_s) estimated from absolute pore pressure signals for BDB-1 borehole measuring intervals with corresponding formations and amplitudes of pressure head fluctuations ∆h

Formation	Chamber	Δh [bar]	Δh [m]	S_s [m⁻¹]
Upper toarcian-staffelegg formation	I₁	8.353 × 10⁻⁴	8.52 × 10⁻³	2.4 × 10⁻⁶
Upper toarcian/lower aalenian-opalinus clay–shaly facies	I₂	1.696 × 10⁻³	1.73 × 10⁻²	1.2 × 10⁻⁶
Upper toarcian/lower aalenian-opalinus clay–shaly facies	I_2–3	1.823 × 10⁻³	1.86 × 10⁻²	1.1 × 10⁻⁶
Lower aalenian-opalinus clay–carbonate-rich facies	I₃	1.255 × 10⁻³	1.28 × 10⁻²	1.6 × 10⁻⁶
Lower aalenian opalinus clay–shaly facies	I₄	1.701 × 10⁻³	1.73 × 10⁻²	1.2 × 10⁻⁶
Middle aalenian-opalinus clay–shaly facies	I₅	1.670 × 10⁻³	1.70 × 10⁻²	1.2 × 10⁻⁶
Upper aalenian-opalinus clay–sandy facies	I₆	1.278 × 10⁻³	1.32 × 10⁻²	1.5 × 10⁻⁶
Upper aalenian-passwang formation	I₇	6.360 × 10⁻⁴	6.49 × 10⁻³	3.1 × 10⁻⁶